trxcon mssdr patch

Change-Id: I35463ec484f1afdef956b399c193a4acfb689e5e

.gitignore

@@ -6,6 +6,12 @@ Transceiver52M/osmo-trx-uhd
 Transceiver52M/osmo-trx-usrp1
 Transceiver52M/osmo-trx-lms
 Transceiver52M/osmo-trx-ipc
+Transceiver52M/osmo-trx-blade
+Transceiver52M/osmo-trx-syncthing-blade
+Transceiver52M/osmo-trx-syncthing-uhd
+Transceiver52M/osmo-trx-ms-blade
+Transceiver52M/osmo-trx-ms-uhd
+
 
 .clang-format
 
@@ -74,3 +80,6 @@ contrib/osmo-trx.spec
 !contrib/osmo-trx.spec.in
 
 utils/osmo-prbs-tool
+/.qtc_clangd/*
+/.cache/*
+/.vscode/*

CommonLibs/Interthread.h

@@ -517,7 +517,7 @@ public:
 		@param timeout The blocking timeout in ms.
 		@return Pointer at key or NULL on timeout.
 	*/
-	D* read(const K &key, unsigned timeout) const
+	D* read(const K &key, unsigned timeout)
 	{
 		if (timeout==0) return readNoBlock(key);
 		ScopedLock lock(mLock);
@@ -537,7 +537,7 @@ public:
 		@param key The key to read from.
 		@return Pointer at key.
 	*/
-	D* read(const K &key) const
+	D* read(const K &key)
 	{
 		ScopedLock lock(mLock);
 		typename Map::const_iterator iter = mMap.find(key);

CommonLibs/Threads.cpp

@@ -43,71 +43,6 @@ using namespace std;
 #endif
 
 
-Mutex gStreamLock;		///< Global lock to control access to cout and cerr.
-
-void lockCout()
-{
-	gStreamLock.lock();
-	Timeval entryTime;
-	cout << entryTime << " " << osmo_gettid() << ": ";
-}
-
-
-void unlockCout()
-{
-	cout << dec << endl << flush;
-	gStreamLock.unlock();
-}
-
-
-void lockCerr()
-{
-	gStreamLock.lock();
-	Timeval entryTime;
-	cerr << entryTime << " " << osmo_gettid() << ": ";
-}
-
-void unlockCerr()
-{
-	cerr << dec << endl << flush;
-	gStreamLock.unlock();
-}
-
-
-
-
-
-
-
-Mutex::Mutex()
-{
-	bool res;
-	res = pthread_mutexattr_init(&mAttribs);
-	assert(!res);
-	res = pthread_mutexattr_settype(&mAttribs,PTHREAD_MUTEX_RECURSIVE);
-	assert(!res);
-	res = pthread_mutex_init(&mMutex,&mAttribs);
-	assert(!res);
-}
-
-
-Mutex::~Mutex()
-{
-	pthread_mutex_destroy(&mMutex);
-	bool res = pthread_mutexattr_destroy(&mAttribs);
-	assert(!res);
-}
-
-
-
-
-/** Block for the signal up to the cancellation timeout. */
-void Signal::wait(Mutex& wMutex, unsigned timeout) const
-{
-	Timeval then(timeout);
-	struct timespec waitTime = then.timespec();
-	pthread_cond_timedwait(&mSignal,&wMutex.mMutex,&waitTime);
-}
 
 void set_selfthread_name(const char *name)
 {

CommonLibs/Threads.h

@@ -28,141 +28,94 @@
 #ifndef THREADS_H
 #define THREADS_H
 
-#include "config.h"
-
+#include <chrono>
+#include <mutex>
+#include <condition_variable>
 #include <pthread.h>
 #include <iostream>
-#include <assert.h>
+#include <cassert>
 #include <unistd.h>
 
+#include "config.h"
+#include "Timeval.h"
+
 class Mutex;
 
-
-/**@name Multithreaded access for standard streams. */
-//@{
-
-/**@name Functions for gStreamLock. */
-//@{
-extern Mutex gStreamLock;	///< global lock for cout and cerr
-void lockCerr();		///< call prior to writing cerr
-void unlockCerr();		///< call after writing cerr
-void lockCout();		///< call prior to writing cout
-void unlockCout();		///< call after writing cout
-//@}
-
-/**@name Macros for standard messages. */
-//@{
-#define COUT(text) { lockCout(); std::cout << text; unlockCout(); }
-#define CERR(text) { lockCerr(); std::cerr << __FILE__ << ":" << __LINE__ << ": " << text; unlockCerr(); }
-#ifdef NDEBUG
-#define DCOUT(text) {}
-#define OBJDCOUT(text) {}
-#else
-#define DCOUT(text) { COUT(__FILE__ << ":" << __LINE__ << " " << text); }
-#define OBJDCOUT(text) { DCOUT(this << " " << text); }
-#endif
-//@}
-//@}
-
-
-
 /**@defgroup C++ wrappers for pthread mechanisms. */
 //@{
 
-/** A class for recursive mutexes based on pthread_mutex. */
+/** A class for recursive mutexes. */
 class Mutex {
-
-	private:
-
-	pthread_mutex_t mMutex;
-	pthread_mutexattr_t mAttribs;
+	std::recursive_mutex m;
 
     public:
 
-	Mutex();
+	void lock() {
+		m.lock();
+	}
 
-	~Mutex();
+	bool trylock() {
+		return m.try_lock();
+	}
 
-	void lock() { pthread_mutex_lock(&mMutex); }
-
-	bool trylock() { return pthread_mutex_trylock(&mMutex)==0; }
-
-	void unlock() { pthread_mutex_unlock(&mMutex); }
+	void unlock() {
+		m.unlock();
+	}
 
 	friend class Signal;
-
 };
 
-
 class ScopedLock {
-
-	private:
 	Mutex &mMutex;
 
     public:
-	ScopedLock(Mutex& wMutex) :mMutex(wMutex) { mMutex.lock(); }
-	~ScopedLock() { mMutex.unlock(); }
-
+	ScopedLock(Mutex &wMutex) : mMutex(wMutex) {
+		mMutex.lock();
+	}
+	~ScopedLock() {
+		mMutex.unlock();
+	}
 };
 
-
-
-
-/** A C++ interthread signal based on pthread condition variables. */
+/** A C++ interthread signal. */
 class Signal {
-
-	private:
-
-	mutable pthread_cond_t mSignal;
+	/* any, because for some reason our mutex is recursive... */
+	std::condition_variable_any mSignal;
 
     public:
 
-	Signal() { int s = pthread_cond_init(&mSignal,NULL); assert(!s); }
+	void wait(Mutex &wMutex, unsigned timeout) {
+		mSignal.wait_for(wMutex.m, std::chrono::milliseconds(timeout));
+	}
 
-	~Signal() { pthread_cond_destroy(&mSignal); }
+	void wait(Mutex &wMutex) {
+		mSignal.wait(wMutex.m);
+	}
 
-	/**
-		Block for the signal up to the cancellation timeout.
-		Under Linux, spurious returns are possible.
-	*/
-	void wait(Mutex& wMutex, unsigned timeout) const;
-
-	/**
-		Block for the signal.
-		Under Linux, spurious returns are possible.
-	*/
-	void wait(Mutex& wMutex) const
-		{ pthread_cond_wait(&mSignal,&wMutex.mMutex); }
-
-	void signal() { pthread_cond_signal(&mSignal); }
-
-	void broadcast() { pthread_cond_broadcast(&mSignal); }
+	void signal() {
+		mSignal.notify_one();
+	}
 
+	void broadcast() {
+		mSignal.notify_all();
+	}
 };
 
-
-
-#define START_THREAD(thread,function,argument) \
-	thread.start((void *(*)(void*))function, (void*)argument);
-
 void set_selfthread_name(const char *name);
 void thread_enable_cancel(bool cancel);
 
 /** A C++ wrapper for pthread threads.  */
 class Thread {
-
     private:
-
 	pthread_t mThread;
 	pthread_attr_t mAttrib;
 	// FIXME -- Can this be reduced now?
 	size_t mStackSize;
 
-
     public:
-
 	/** Create a thread in a non-running state. */
-	Thread(size_t wStackSize = 0):mThread((pthread_t)0) {
+	Thread(size_t wStackSize = 0) : mThread((pthread_t)0)
+	{
 		pthread_attr_init(&mAttrib); // (pat) moved this here.
 		mStackSize = wStackSize;
 	}
@@ -172,14 +125,17 @@ class Thread {
 		It should be stopped and joined.
 	*/
 	// (pat) If the Thread is destroyed without being started, then mAttrib is undefined.  Oops.
-	~Thread() { pthread_attr_destroy(&mAttrib); }
-
+	~Thread()
+	{
+		pthread_attr_destroy(&mAttrib);
+	}
 
 	/** Start the thread on a task. */
 	void start(void *(*task)(void *), void *arg);
 
 	/** Join a thread that will stop on its own. */
-	void join() {
+	void join()
+	{
 		if (mThread) {
 			int s = pthread_join(mThread, NULL);
 			assert(!s);
@@ -187,7 +143,10 @@ class Thread {
 	}
 
 	/** Send cancellation to thread */
-	void cancel() { pthread_cancel(mThread); }
+	void cancel()
+	{
+		pthread_cancel(mThread);
+	}
 };
 
 #ifdef HAVE_ATOMIC_OPS

GSM/GSMCommon.cpp

@@ -55,12 +55,15 @@ const BitVector GSM::gEdgeTrainingSequence[] = {
 };
 
 const BitVector GSM::gDummyBurst("0001111101101110110000010100100111000001001000100000001111100011100010111000101110001010111010010100011001100111001111010011111000100101111101010000");
+const BitVector GSM::gDummyBurstTSC("01110001011100010111000101");
 
 /* 3GPP TS 05.02, section 5.2.7 "Access burst (AB)", synch. sequence bits */
 const BitVector GSM::gRACHSynchSequenceTS0("01001011011111111001100110101010001111000");  /* GSM, GMSK (default) */
 const BitVector GSM::gRACHSynchSequenceTS1("01010100111110001000011000101111001001101");  /* EGPRS, 8-PSK */
 const BitVector GSM::gRACHSynchSequenceTS2("11101111001001110101011000001101101110111");  /* EGPRS, GMSK */
 
+const BitVector GSM::gSCHSynchSequence("1011100101100010000001000000111100101101010001010111011000011011");
+
 //                               |-head-||---------midamble----------------------||--------------data----------------||t|
 const BitVector GSM::gRACHBurst("0011101001001011011111111001100110101010001111000110111101111110000111001001010110011000");
 

GSM/GSMCommon.h

@@ -52,11 +52,16 @@ extern const BitVector gEdgeTrainingSequence[];
 
 /** C0T0 filler burst, GSM 05.02, 5.2.6 */
 extern const BitVector gDummyBurst;
+extern const BitVector gDummyBurstTSC;
 
 /** Random access burst synch. sequence */
 extern const BitVector gRACHSynchSequenceTS0;
 extern const BitVector gRACHSynchSequenceTS1;
 extern const BitVector gRACHSynchSequenceTS2;
+
+/** Synchronization burst sync sequence */
+extern const BitVector gSCHSynchSequence;
+
 /** Random access burst synch. sequence, GSM 05.02 5.2.7 */
 extern const BitVector gRACHBurst;
 

Makefile.am

@@ -28,6 +28,7 @@ AM_CXXFLAGS = -Wall -pthread
 
 # Order must be preserved
 SUBDIRS = \
+	trxcon \
 	CommonLibs \
 	GSM \
 	Transceiver52M \

Makefile.common

@@ -28,6 +28,7 @@ STD_DEFINES_AND_INCLUDES = \
 
 COMMON_LA = $(top_builddir)/CommonLibs/libcommon.la
 GSM_LA = $(top_builddir)/GSM/libGSM.la
+TRXCON_LA = $(top_builddir)/trxcon/libtrxcon.la
 
 if ARCH_ARM
 ARCH_LA = $(top_builddir)/Transceiver52M/arch/arm/libarch.la

Transceiver52M/Makefile.am

@@ -24,12 +24,13 @@ include $(top_srcdir)/Makefile.common
 SUBDIRS = arch device
 
 AM_CPPFLAGS = -Wall $(STD_DEFINES_AND_INCLUDES) -I${srcdir}/arch/common -I${srcdir}/device/common
-AM_CXXFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOVTY_CFLAGS)
-AM_CFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOVTY_CFLAGS)
+AM_CXXFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOVTY_CFLAGS) -mcpu=cortex-a72 -mfloat-abi=hard -mfpu=neon-fp-armv8
+AM_CFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS) $(LIBOSMOCTRL_CFLAGS) $(LIBOSMOVTY_CFLAGS) -mcpu=cortex-a72 -mfloat-abi=hard -mfpu=neon-fp-armv8
 
 noinst_LTLIBRARIES = libtransceiver_common.la
 
 COMMON_SOURCES = \
+	l1if.cpp \
 	radioInterface.cpp \
 	radioVector.cpp \
 	radioClock.cpp \
@@ -40,7 +41,10 @@ COMMON_SOURCES = \
 	ChannelizerBase.cpp \
 	Channelizer.cpp \
 	Synthesis.cpp \
-	proto_trxd.c
+	proto_trxd.c \
+	sch.c \
+	grgsm_vitac/grgsm_vitac.cpp \
+	grgsm_vitac/viterbi_detector.cc
 
 libtransceiver_common_la_SOURCES = \
 	$(COMMON_SOURCES) \
@@ -61,13 +65,16 @@ noinst_HEADERS = \
 	ChannelizerBase.h \
 	Channelizer.h \
 	Synthesis.h \
-	proto_trxd.h
+	proto_trxd.h \
+	grgsm_vitac/viterbi_detector.h \
+	grgsm_vitac/constants.h
 
 COMMON_LDADD = \
 	libtransceiver_common.la \
 	$(ARCH_LA) \
 	$(GSM_LA) \
 	$(COMMON_LA) \
+	$(TRXCON_LA) \
 	$(FFTWF_LIBS) \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOCTRL_LIBS) \
@@ -83,6 +90,21 @@ osmo_trx_uhd_LDADD = \
 	$(COMMON_LDADD) \
 	$(UHD_LIBS)
 osmo_trx_uhd_CPPFLAGS  = $(AM_CPPFLAGS) $(UHD_CFLAGS)
+
+bin_PROGRAMS += osmo-trx-ms-uhd
+osmo_trx_ms_uhd_SOURCES = ms/syncthing.cpp ms/ms_rx_lower.cpp ms/ms_rx_upper.cpp ms/ms_commandhandler.cpp
+osmo_trx_ms_uhd_LDADD = \
+	$(builddir)/device/bladerf/libdevice.la \
+	$(COMMON_LDADD) \
+	$(UHD_LIBS) \
+	$(TRXCON_LA)
+osmo_trx_ms_uhd_CPPFLAGS  = $(AM_CPPFLAGS) $(UHD_CFLAGS) -DBUILDUHD
+
+bin_PROGRAMS += osmo-trx-syncthing-uhd
+osmo_trx_syncthing_uhd_SOURCES = $(osmo_trx_ms_uhd_SOURCES) ms/ms_rx_burst.cpp
+osmo_trx_syncthing_uhd_LDADD =  $(osmo_trx_ms_uhd_LDADD)
+osmo_trx_syncthing_uhd_CPPFLAGS  = $(AM_CPPFLAGS) $(UHD_CFLAGS) -DSYNCTHINGONLY -DBUILDUHD
+#osmo_trx_syncthing_LDFLAGS  = -fsanitize=address,undefined -shared-libsan
 endif
 
 if DEVICE_USRP1
@@ -105,6 +127,31 @@ osmo_trx_lms_LDADD = \
 osmo_trx_lms_CPPFLAGS  = $(AM_CPPFLAGS) $(LMS_CFLAGS)
 endif
 
+if DEVICE_BLADE
+bin_PROGRAMS += osmo-trx-blade
+osmo_trx_blade_SOURCES = osmo-trx.cpp
+osmo_trx_blade_LDADD = \
+	$(builddir)/device/bladerf/libdevice.la \
+	$(COMMON_LDADD) \
+	$(BLADE_LIBS)
+osmo_trx_blade_CPPFLAGS  = $(AM_CPPFLAGS) $(LMS_CFLAGS)
+
+bin_PROGRAMS += osmo-trx-ms-blade
+osmo_trx_ms_blade_SOURCES = ms/syncthing.cpp ms/ms_rx_lower.cpp ms/ms_rx_upper.cpp ms/ms_commandhandler.cpp
+osmo_trx_ms_blade_LDADD = \
+	$(builddir)/device/bladerf/libdevice.la \
+	$(COMMON_LDADD) \
+	$(BLADE_LIBS) \
+	$(TRXCON_LA)
+osmo_trx_ms_blade_CPPFLAGS  = $(AM_CPPFLAGS) $(BLADE_CFLAGS) -DBUILDBLADE
+
+bin_PROGRAMS += osmo-trx-syncthing-blade
+osmo_trx_syncthing_blade_SOURCES = $(osmo_trx_ms_blade_SOURCES) ms/ms_rx_burst.cpp
+osmo_trx_syncthing_blade_LDADD =  $(osmo_trx_ms_blade_LDADD)
+osmo_trx_syncthing_blade_CPPFLAGS  = $(AM_CPPFLAGS) $(BLADE_CFLAGS) -DSYNCTHINGONLY -DBUILDBLADE -mcpu=cortex-a72 -mfloat-abi=hard -mfpu=neon-fp-armv8 -I../device/ipc
+#osmo_trx_syncthing_LDFLAGS  = -fsanitize=address,undefined -shared-libsan
+endif
+
 if DEVICE_IPC
 bin_PROGRAMS += osmo-trx-ipc
 osmo_trx_ipc_SOURCES = osmo-trx.cpp
@@ -112,5 +159,33 @@ osmo_trx_ipc_LDADD = \
 	$(builddir)/device/ipc/libdevice.la \
 	$(COMMON_LDADD)
 osmo_trx_ipc_CPPFLAGS  = $(AM_CPPFLAGS)
+
+bin_PROGRAMS += osmo-trx-ipc2
+osmo_trx_ipc2_SOURCES = osmo-trx.cpp
+osmo_trx_ipc2_LDADD = \
+	$(builddir)/device/ipc2/libdevice.la \
+	$(COMMON_LDADD)
+osmo_trx_ipc2_CPPFLAGS  = $(AM_CPPFLAGS)
+
+bin_PROGRAMS += osmo-trx-ms-ipc
+osmo_trx_ms_ipc_SOURCES = ms/syncthing.cpp ms/ms_rx_lower.cpp ms/ms_rx_upper.cpp ms/ms_commandhandler.cpp
+osmo_trx_ms_ipc_LDADD = \
+	$(COMMON_LDADD) \
+	$(TRXCON_LA)
+osmo_trx_ms_ipc_CPPFLAGS  = $(AM_CPPFLAGS) -DBUILDIPC  -I./device/ipc2 -I../device/ipc2
+
+bin_PROGRAMS += osmo-trx-syncthing-ipc
+osmo_trx_syncthing_ipc_SOURCES = $(osmo_trx_ms_ipc_SOURCES) ms/ms_rx_burst.cpp
+osmo_trx_syncthing_ipc_LDADD =  $(COMMON_LDADD)
+osmo_trx_syncthing_ipc_CPPFLAGS  = $(AM_CPPFLAGS) -DSYNCTHINGONLY -DBUILDIPC  -I./device/ipc2 -I../device/ipc2
 endif
 
+noinst_HEADERS += \
+	ms/syncthing.h \
+	ms/bladerf_specific.h \
+	ms/uhd_specific.h \
+	ms/ms_rx_upper.h \
+	ms/ms_state.h \
+	itrq.h
+# -fsanitize=address,undefined -shared-libsan -O0
+#

Transceiver52M/Resampler.cpp

@@ -32,7 +32,7 @@ extern "C" {
 #define M_PI			3.14159265358979323846264338327f
 #endif
 
-#define MAX_OUTPUT_LEN		4096
+#define MAX_OUTPUT_LEN 4096 * 4
 
 using namespace std;
 

Transceiver52M/Transceiver.cpp

@@ -135,12 +135,13 @@ bool TransceiverState::init(FillerType filler, size_t sps, float scale, size_t r
 Transceiver::Transceiver(const struct trx_cfg *cfg,
                          GSM::Time wTransmitLatency,
                          RadioInterface *wRadioInterface)
-  : cfg(cfg), mClockSocket(-1),
-    mRxLowerLoopThread(nullptr), mTxLowerLoopThread(nullptr),
-    mTransmitLatency(wTransmitLatency), mRadioInterface(wRadioInterface),
-    mChans(cfg->num_chans), mOn(false), mForceClockInterface(false),
-    mTxFreq(0.0), mRxFreq(0.0), mTSC(0), mMaxExpectedDelayAB(0),
-    mMaxExpectedDelayNB(0), mWriteBurstToDiskMask(0)
+  : mChans(cfg->num_chans), cfg(cfg),
+    mCtrlSockets(mChans), mClockSocket(-1),
+    mTxPriorityQueues(mChans), mReceiveFIFO(mChans),
+    mRxServiceLoopThreads(mChans), mRxLowerLoopThread(nullptr), mTxLowerLoopThread(nullptr),
+    mTxPriorityQueueServiceLoopThreads(mChans), mTransmitLatency(wTransmitLatency), mRadioInterface(wRadioInterface),
+    mOn(false),mForceClockInterface(false), mTxFreq(0.0), mRxFreq(0.0), mTSC(0), mMaxExpectedDelayAB(0),
+    mMaxExpectedDelayNB(0), mWriteBurstToDiskMask(0), mVersionTRXD(mChans), mStates(mChans)
 {
   txFullScale = mRadioInterface->fullScaleInputValue();
   rxFullScale = mRadioInterface->fullScaleOutputValue();
@@ -208,14 +209,7 @@ bool Transceiver::init()
   }
 
   mDataSockets.resize(mChans, -1);
-  mCtrlSockets.resize(mChans);
-  mTxPriorityQueueServiceLoopThreads.resize(mChans);
-  mRxServiceLoopThreads.resize(mChans);
   
-  mTxPriorityQueues.resize(mChans);
-  mReceiveFIFO.resize(mChans);
-  mStates.resize(mChans);
-  mVersionTRXD.resize(mChans);
 
   /* Filler table retransmissions - support only on channel 0 */
   if (cfg->filler == FILLER_DUMMY)

Transceiver52M/Transceiver.h

@@ -80,7 +80,7 @@ struct TransceiverState {
 
   /* Received noise energy levels */
   float mNoiseLev;
-  noiseVector mNoises;
+  avgVector mNoises;
 
   /* Shadowed downlink attenuation */
   int mPower;
@@ -148,6 +148,7 @@ public:
   } ChannelCombination;
 
 private:
+  size_t mChans;
 struct ctrl_msg {
   char data[101];
   ctrl_msg() {};
@@ -218,7 +219,7 @@ struct ctrl_sock_state {
   /** drive handling of control messages from GSM core */
   int ctrl_sock_handle_rx(int chan);
 
-  size_t mChans;
+
   bool mOn;	                           ///< flag to indicate that transceiver is powered on
   bool mForceClockInterface;           ///< flag to indicate whether IND CLOCK shall be sent unconditionally after transceiver is started
   bool mHandover[8][8];                ///< expect handover to the timeslot/subslot

Transceiver52M/arch/common/convert_base.c

@@ -17,6 +17,7 @@
 
 #include "convert.h"
 
+__attribute__((xray_never_instrument))
 void base_convert_float_short(short *out, const float *in,
 			      float scale, int len)
 {
@@ -24,6 +25,7 @@ void base_convert_float_short(short *out, const float *in,
 		out[i] = in[i] * scale;
 }
 
+__attribute__((xray_never_instrument))
 void base_convert_short_float(float *out, const short *in, int len)
 {
 	for (int i = 0; i < len; i++)

Transceiver52M/arch/common/convolve_base.c

@@ -24,6 +24,7 @@
 #endif
 
 /* Base multiply and accumulate complex-real */
+__attribute__((xray_never_instrument))
 static void mac_real(const float *x, const float *h, float *y)
 {
 	y[0] += x[0] * h[0];
@@ -31,6 +32,7 @@ static void mac_real(const float *x, const float *h, float *y)
 }
 
 /* Base multiply and accumulate complex-complex */
+__attribute__((xray_never_instrument))
 static void mac_cmplx(const float *x, const float *h, float *y)
 {
 	y[0] += x[0] * h[0] - x[1] * h[1];
@@ -38,6 +40,7 @@ static void mac_cmplx(const float *x, const float *h, float *y)
 }
 
 /* Base vector complex-complex multiply and accumulate */
+__attribute__((xray_never_instrument))
 static void mac_real_vec_n(const float *x, const float *h, float *y,
 			   int len)
 {
@@ -46,6 +49,7 @@ static void mac_real_vec_n(const float *x, const float *h, float *y,
 }
 
 /* Base vector complex-complex multiply and accumulate */
+__attribute__((xray_never_instrument))
 static void mac_cmplx_vec_n(const float *x, const float *h, float *y,
 			    int len)
 {
@@ -54,6 +58,7 @@ static void mac_cmplx_vec_n(const float *x, const float *h, float *y,
 }
 
 /* Base complex-real convolution */
+__attribute__((xray_never_instrument))
 int _base_convolve_real(const float *x, int x_len,
 			const float *h, int h_len,
 			float *y, int y_len,
@@ -69,6 +74,7 @@ int _base_convolve_real(const float *x, int x_len,
 }
 
 /* Base complex-complex convolution */
+__attribute__((xray_never_instrument))
 int _base_convolve_complex(const float *x, int x_len,
 			   const float *h, int h_len,
 			   float *y, int y_len,
@@ -85,6 +91,7 @@ int _base_convolve_complex(const float *x, int x_len,
 }
 
 /* Buffer validity checks */
+__attribute__((xray_never_instrument))
 int bounds_check(int x_len, int h_len, int y_len,
 		 int start, int len)
 {
@@ -105,6 +112,7 @@ int bounds_check(int x_len, int h_len, int y_len,
 }
 
 /* API: Non-aligned (no SSE) complex-real */
+__attribute__((xray_never_instrument))
 int base_convolve_real(const float *x, int x_len,
 		       const float *h, int h_len,
 		       float *y, int y_len,
@@ -122,6 +130,7 @@ int base_convolve_real(const float *x, int x_len,
 }
 
 /* API: Non-aligned (no SSE) complex-complex */
+__attribute__((xray_never_instrument))
 int base_convolve_complex(const float *x, int x_len,
 			  const float *h, int h_len,
 			  float *y, int y_len,
@@ -139,6 +148,7 @@ int base_convolve_complex(const float *x, int x_len,
 }
 
 /* Aligned filter tap allocation */
+__attribute__((xray_never_instrument))
 void *convolve_h_alloc(size_t len)
 {
 #ifdef HAVE_SSE3

Transceiver52M/arch/x86/convert.c

@@ -60,6 +60,7 @@ void convert_init(void)
 #endif
 }
 
+__attribute__((xray_never_instrument))
 void convert_float_short(short *out, const float *in, float scale, int len)
 {
 	if (!(len % 16))
@@ -70,6 +71,7 @@ void convert_float_short(short *out, const float *in, float scale, int len)
 		c.convert_scale_ps_si16(out, in, scale, len);
 }
 
+__attribute__((xray_never_instrument))
 void convert_short_float(float *out, const short *in, int len)
 {
 	if (!(len % 16))

Transceiver52M/arch/x86/convert_sse_3.c

@@ -26,6 +26,7 @@
 #include <emmintrin.h>
 
 /* 8*N single precision floats scaled and converted to 16-bit signed integer */
+__attribute__((xray_never_instrument))
 void _sse_convert_scale_ps_si16_8n(short *restrict out,
 				   const float *restrict in,
 				   float scale, int len)
@@ -54,6 +55,7 @@ void _sse_convert_scale_ps_si16_8n(short *restrict out,
 }
 
 /* 8*N single precision floats scaled and converted with remainder */
+__attribute__((xray_never_instrument))
 void _sse_convert_scale_ps_si16(short *restrict out,
 				const float *restrict in, float scale, int len)
 {
@@ -66,6 +68,7 @@ void _sse_convert_scale_ps_si16(short *restrict out,
 }
 
 /* 16*N single precision floats scaled and converted to 16-bit signed integer */
+__attribute__((xray_never_instrument))
 void _sse_convert_scale_ps_si16_16n(short *restrict out,
 				    const float *restrict in,
 				    float scale, int len)

Transceiver52M/arch/x86/convert_sse_4_1.c

@@ -25,6 +25,7 @@
 #include <smmintrin.h>
 
 /* 16*N 16-bit signed integer converted to single precision floats */
+__attribute__((xray_never_instrument))
 void _sse_convert_si16_ps_16n(float *restrict out,
 			      const short *restrict in, int len)
 {
@@ -59,6 +60,7 @@ void _sse_convert_si16_ps_16n(float *restrict out,
 }
 
 /* 16*N 16-bit signed integer conversion with remainder */
+__attribute__((xray_never_instrument))
 void _sse_convert_si16_ps(float *restrict out,
 			  const short *restrict in, int len)
 {

Transceiver52M/arch/x86/convolve.c

@@ -91,6 +91,7 @@ void convolve_init(void)
 }
 
 /* API: Aligned complex-real */
+__attribute__((xray_never_instrument))
 int convolve_real(const float *x, int x_len,
 		  const float *h, int h_len,
 		  float *y, int y_len, int start, int len)
@@ -130,6 +131,7 @@ int convolve_real(const float *x, int x_len,
 }
 
 /* API: Aligned complex-complex */
+__attribute__((xray_never_instrument))
 int convolve_complex(const float *x, int x_len,
 		     const float *h, int h_len,
 		     float *y, int y_len,

Transceiver52M/arch/x86/convolve_sse_3.c

@@ -27,6 +27,7 @@
 #include <pmmintrin.h>
 
 /* 4-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real4(const float *x, int x_len,
 		    const float *h, int h_len,
 		    float *y, int y_len,
@@ -68,6 +69,7 @@ void sse_conv_real4(const float *x, int x_len,
 }
 
 /* 8-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real8(const float *x, int x_len,
 		    const float *h, int h_len,
 		    float *y, int y_len,
@@ -119,6 +121,7 @@ void sse_conv_real8(const float *x, int x_len,
 }
 
 /* 12-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real12(const float *x, int x_len,
 		     const float *h, int h_len,
 		     float *y, int y_len,
@@ -185,6 +188,7 @@ void sse_conv_real12(const float *x, int x_len,
 }
 
 /* 16-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real16(const float *x, int x_len,
 		     const float *h, int h_len,
 		     float *y, int y_len,
@@ -264,6 +268,7 @@ void sse_conv_real16(const float *x, int x_len,
 }
 
 /* 20-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real20(const float *x, int x_len,
 		     const float *h, int h_len,
 		     float *y, int y_len,
@@ -354,6 +359,7 @@ void sse_conv_real20(const float *x, int x_len,
 }
 
 /* 4*N-tap SSE complex-real convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_real4n(const float *x, int x_len,
 		     const float *h, int h_len,
 		     float *y, int y_len,
@@ -401,6 +407,7 @@ void sse_conv_real4n(const float *x, int x_len,
 }
 
 /* 4*N-tap SSE complex-complex convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_cmplx_4n(const float *x, int x_len,
 		       const float *h, int h_len,
 		       float *y, int y_len,
@@ -459,6 +466,7 @@ void sse_conv_cmplx_4n(const float *x, int x_len,
 }
 
 /* 8*N-tap SSE complex-complex convolution */
+__attribute__((xray_never_instrument))
 void sse_conv_cmplx_8n(const float *x, int x_len,
 		       const float *h, int h_len,
 		       float *y, int y_len,

Transceiver52M/device/Makefile.am

@@ -3,7 +3,7 @@ include $(top_srcdir)/Makefile.common
 SUBDIRS = common
 
 if DEVICE_IPC
-SUBDIRS += ipc
+SUBDIRS += ipc ipc2
 endif
 
 if DEVICE_USRP1
@@ -17,3 +17,7 @@ endif
 if DEVICE_LMS
 SUBDIRS += lms
 endif
+
+if DEVICE_BLADE
+SUBDIRS += bladerf
+endif

Transceiver52M/device/bladerf/Makefile.am

@@ -0,0 +1,11 @@
+include $(top_srcdir)/Makefile.common
+
+AM_CPPFLAGS = -Wall $(STD_DEFINES_AND_INCLUDES) -I${srcdir}/../common
+AM_CXXFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(BLADE_CFLAGS)
+
+noinst_HEADERS = bladerf.h
+
+noinst_LTLIBRARIES = libdevice.la
+
+libdevice_la_SOURCES = bladerf.cpp
+libdevice_la_LIBADD = $(top_builddir)/Transceiver52M/device/common/libdevice_common.la

Transceiver52M/device/bladerf/bladerf.cpp

@@ -0,0 +1,777 @@
+/*
+ * Copyright 2022 sysmocom - s.f.m.c. GmbH
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * SPDX-License-Identifier: AGPL-3.0+
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * See the COPYING file in the main directory for details.
+ */
+
+#include <map>
+#include <libbladeRF.h>
+#include "radioDevice.h"
+#include "bladerf.h"
+#include "Threads.h"
+#include "Logger.h"
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+extern "C" {
+#include <osmocom/core/utils.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/vty/cpu_sched_vty.h>
+}
+
+#define USRP_TX_AMPL     0.3
+#define UMTRX_TX_AMPL    0.7
+#define LIMESDR_TX_AMPL  0.3
+#define SAMPLE_BUF_SZ    (1 << 20)
+
+/*
+ * UHD timeout value on streaming (re)start
+ *
+ * Allow some time for streaming to commence after the start command is issued,
+ * but consider a wait beyond one second to be a definite error condition.
+ */
+#define UHD_RESTART_TIMEOUT     1.0
+
+/*
+ * UmTRX specific settings
+ */
+#define UMTRX_VGA1_DEF   -18
+
+/*
+ * USRP version dependent device timings
+ */
+
+#define B2XX_TIMING_1SPS	1.7153e-4
+#define B2XX_TIMING_4SPS	1.1696e-4
+#define B2XX_TIMING_4_4SPS	6.18462e-5
+#define B2XX_TIMING_MCBTS	7e-5
+
+#define CHKRET() { \
+	if(status !=0) \
+	fprintf(stderr, "%s:%s:%d %s\n", __FILE__,__FUNCTION__, __LINE__, bladerf_strerror(status)); \
+	}
+
+/*
+ * Tx / Rx sample offset values. In a perfect world, there is no group delay
+ * though analog components, and behaviour through digital filters exactly
+ * matches calculated values. In reality, there are unaccounted factors,
+ * which are captured in these empirically measured (using a loopback test)
+ * timing correction values.
+ *
+ * Notes:
+ *   USRP1 with timestamps is not supported by UHD.
+ */
+
+/* Device Type, Tx-SPS, Rx-SPS */
+typedef std::tuple<blade_dev_type, int, int> dev_key;
+
+/* Device parameter descriptor */
+struct dev_desc {
+	unsigned channels;
+	double mcr;
+	double rate;
+	double offset;
+	std::string str;
+};
+
+static const std::map<dev_key, dev_desc> dev_param_map {
+	{ std::make_tuple(blade_dev_type::BLADE2,  1, 1), { 1, 26e6, GSMRATE, B2XX_TIMING_1SPS, "B200 1 SPS"   } },
+	{ std::make_tuple(blade_dev_type::BLADE2,  4, 1), { 1, 26e6, GSMRATE, B2XX_TIMING_4SPS, "B200 4/1 Tx/Rx SPS" } },
+	{ std::make_tuple(blade_dev_type::BLADE2,  4, 4), { 1, 26e6, GSMRATE, B2XX_TIMING_4_4SPS, "B200 4 SPS" } },
+};
+
+typedef std::tuple<blade_dev_type, enum gsm_band> dev_band_key;
+typedef std::map<dev_band_key, dev_band_desc>::const_iterator dev_band_map_it;
+static const std::map<dev_band_key, dev_band_desc> dev_band_nom_power_param_map {
+	{ std::make_tuple(blade_dev_type::BLADE2, GSM_BAND_850),	{ 89.75, 13.3, -7.5  } },
+	{ std::make_tuple(blade_dev_type::BLADE2, GSM_BAND_900),	{ 89.75, 13.3, -7.5  } },
+	{ std::make_tuple(blade_dev_type::BLADE2, GSM_BAND_1800),	{ 89.75, 7.5,  -11.0 } },
+	{ std::make_tuple(blade_dev_type::BLADE2, GSM_BAND_1900),	{ 89.75, 7.7,  -11.0 } },
+};
+
+
+/* So far measurements done for B210 show really close to linear relationship
+ * between gain and real output power, so we simply adjust the measured offset
+ */
+static double TxGain2TxPower(const dev_band_desc &desc, double tx_gain_db)
+{
+	return desc.nom_out_tx_power - (desc.nom_uhd_tx_gain - tx_gain_db);
+}
+static double TxPower2TxGain(const dev_band_desc &desc, double tx_power_dbm)
+{
+	return desc.nom_uhd_tx_gain - (desc.nom_out_tx_power - tx_power_dbm);
+}
+
+blade_device::blade_device(size_t tx_sps, size_t rx_sps,
+		       InterfaceType iface, size_t chan_num, double lo_offset,
+		       const std::vector<std::string>& tx_paths,
+		       const std::vector<std::string>& rx_paths)
+	: RadioDevice(tx_sps, rx_sps, iface, chan_num, lo_offset, tx_paths, rx_paths),
+	  dev(nullptr), rx_gain_min(0.0), rx_gain_max(0.0),
+	  band_ass_curr_sess(false), band((enum gsm_band)0), tx_spp(0),
+	  rx_spp(0), started(false), aligned(false),
+	  drop_cnt(0), prev_ts(0), ts_initial(0), ts_offset(0), async_event_thrd(NULL)
+{
+}
+
+blade_device::~blade_device()
+{
+	if(dev) {
+		bladerf_enable_module(dev, BLADERF_CHANNEL_RX(0), false);
+		bladerf_enable_module(dev, BLADERF_CHANNEL_TX(0), false);
+	}
+
+	stop();
+
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		delete rx_buffers[i];
+}
+
+void blade_device::assign_band_desc(enum gsm_band req_band)
+{
+	dev_band_map_it it;
+
+	it = dev_band_nom_power_param_map.find(dev_band_key(dev_type, req_band));
+	if (it == dev_band_nom_power_param_map.end()) {
+		dev_desc desc = dev_param_map.at(dev_key(dev_type, tx_sps, rx_sps));
+		LOGC(DDEV, ERROR) << "No Power parameters exist for device "
+				    << desc.str << " on band " << gsm_band_name(req_band)
+				    << ", using B210 ones as fallback";
+		it = dev_band_nom_power_param_map.find(dev_band_key(blade_dev_type::BLADE2, req_band));
+	}
+	OSMO_ASSERT(it != dev_band_nom_power_param_map.end())
+	band_desc = it->second;
+}
+
+bool blade_device::set_band(enum gsm_band req_band)
+{
+	if (band_ass_curr_sess && req_band != band) {
+		LOGC(DDEV, ALERT) << "Requesting band " << gsm_band_name(req_band)
+				  << " different from previous band " << gsm_band_name(band);
+		return false;
+	}
+
+	if (req_band != band) {
+		band = req_band;
+		assign_band_desc(band);
+	}
+	band_ass_curr_sess = true;
+	return true;
+}
+
+void blade_device::get_dev_band_desc(dev_band_desc& desc)
+{
+	if (band == 0) {
+		LOGC(DDEV, ERROR) << "Power parameters requested before Tx Frequency was set! Providing band 900 by default...";
+		assign_band_desc(GSM_BAND_900);
+	}
+	desc = band_desc;
+}
+
+void blade_device::init_gains()
+{
+	double tx_gain_min, tx_gain_max;
+	int status;
+
+	
+	const struct bladerf_range* r;
+	bladerf_get_gain_range(dev, BLADERF_RX, &r);
+
+
+	rx_gain_min = r->min;
+	rx_gain_max = r->max;
+	LOGC(DDEV, INFO) << "Supported Rx gain range [" << rx_gain_min << "; " << rx_gain_max << "]";
+
+	for (size_t i = 0; i < rx_gains.size(); i++) {
+		double gain = (rx_gain_min + rx_gain_max) / 2;
+		status = bladerf_set_gain_mode(dev, BLADERF_CHANNEL_RX(i), BLADERF_GAIN_MGC );
+		CHKRET()
+		bladerf_gain_mode m;
+		bladerf_get_gain_mode(dev, BLADERF_CHANNEL_RX(i), &m);
+		LOGC(DDEV, INFO) << (m == BLADERF_GAIN_MANUAL ? "gain manual" : "gain AUTO") ;
+
+		status = bladerf_set_gain(dev, BLADERF_CHANNEL_RX(i), 0);//gain);
+		CHKRET()
+		int actual_gain;
+		status = bladerf_get_gain(dev, BLADERF_CHANNEL_RX(i), &actual_gain);
+		CHKRET()
+		LOGC(DDEV, INFO) << "Default setting Rx gain for channel " << i << " to " << gain << " scale " << r->scale << " actual " << actual_gain;
+		rx_gains[i] = actual_gain;
+
+		status = bladerf_set_gain(dev, BLADERF_CHANNEL_RX(i), 0);//gain);
+		CHKRET()
+		status = bladerf_get_gain(dev, BLADERF_CHANNEL_RX(i), &actual_gain);
+		CHKRET()
+		LOGC(DDEV, INFO) << "Default setting Rx gain for channel " << i << " to " << gain << " scale " << r->scale << " actual " << actual_gain;
+		rx_gains[i] = actual_gain;
+	}
+
+	status = bladerf_get_gain_range(dev, BLADERF_TX, &r);
+	CHKRET()
+	tx_gain_min = r->min;
+	tx_gain_max = r->max;
+	LOGC(DDEV, INFO) << "Supported Tx gain range [" << tx_gain_min << "; " << tx_gain_max << "]";
+
+	for (size_t i = 0; i < tx_gains.size(); i++) {
+		double gain = (tx_gain_min + tx_gain_max) / 2;
+		status = bladerf_set_gain(dev, BLADERF_CHANNEL_TX(i), 30);//gain);
+		CHKRET()
+		int actual_gain;
+		status = bladerf_get_gain(dev, BLADERF_CHANNEL_TX(i), &actual_gain);
+		CHKRET()
+		LOGC(DDEV, INFO) << "Default setting Tx gain for channel " << i << " to " << gain << " scale " << r->scale << " actual " << actual_gain;
+		tx_gains[i] = actual_gain;
+	}
+
+	return;
+
+}
+
+void blade_device::set_rates()
+{
+	//dev_desc desc = dev_param_map.at(dev_key(dev_type, tx_sps, rx_sps));
+
+	struct bladerf_rational_rate rate = {0, static_cast<uint64_t>((1625e3 * 4)), 6}, actual;
+	auto status = bladerf_set_rational_sample_rate(dev, BLADERF_CHANNEL_RX(0), &rate, &actual);
+	CHKRET()
+	status = bladerf_set_rational_sample_rate(dev, BLADERF_CHANNEL_TX(0), &rate, &actual);
+	CHKRET()
+
+
+	tx_rate = rx_rate = (double)rate.num/(double)rate.den;
+
+	LOGC(DDEV, INFO) << "Rates set to" << tx_rate << " / " << rx_rate;
+
+
+    bladerf_set_bandwidth(dev, BLADERF_CHANNEL_RX(0), (bladerf_bandwidth)2e6, (bladerf_bandwidth*)NULL);
+    bladerf_set_bandwidth(dev, BLADERF_CHANNEL_TX(0), (bladerf_bandwidth)2e6, (bladerf_bandwidth*)NULL);
+
+	ts_offset = 60;//static_cast<TIMESTAMP>(desc.offset * rx_rate);
+	//LOGC(DDEV, INFO) << "Rates configured for " << desc.str;
+}
+
+double blade_device::setRxGain(double db, size_t chan)
+{
+	if (chan >= rx_gains.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0f;
+	}
+
+	bladerf_set_gain(dev, BLADERF_CHANNEL_RX(chan), 30);//db);
+	int actual_gain;
+	bladerf_get_gain(dev, BLADERF_CHANNEL_RX(chan), &actual_gain);
+
+	rx_gains[chan] = actual_gain;
+
+	LOGC(DDEV, INFO) << "Set RX gain to " << rx_gains[chan] << "dB (asked for " << db << "dB)";
+
+	return rx_gains[chan];
+}
+
+double blade_device::getRxGain(size_t chan)
+{
+	if (chan >= rx_gains.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0f;
+	}
+
+	return rx_gains[chan];
+}
+
+double blade_device::rssiOffset(size_t chan)
+{
+	double rssiOffset;
+	dev_band_desc desc;
+
+	if (chan >= rx_gains.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0f;
+	}
+
+	get_dev_band_desc(desc);
+	rssiOffset = rx_gains[chan] + desc.rxgain2rssioffset_rel;
+	return rssiOffset;
+}
+
+double blade_device::setPowerAttenuation(int atten, size_t chan) {
+	double tx_power, db;
+	dev_band_desc desc;
+
+	if (chan >= tx_gains.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel" << chan;
+		return 0.0f;
+	}
+
+	get_dev_band_desc(desc);
+	tx_power = desc.nom_out_tx_power - atten;
+	db = TxPower2TxGain(desc, tx_power);
+
+	bladerf_set_gain(dev, BLADERF_CHANNEL_TX(chan), 30);//db);
+	int actual_gain;
+	bladerf_get_gain(dev, BLADERF_CHANNEL_RX(chan), &actual_gain);
+
+	tx_gains[chan] = actual_gain;
+
+	LOGC(DDEV, INFO) << "Set TX gain to " << tx_gains[chan] << "dB, ~"
+			 <<  TxGain2TxPower(desc, tx_gains[chan]) << " dBm "
+			 << "(asked for " << db << " dB, ~" << tx_power << " dBm)";
+
+	return desc.nom_out_tx_power - TxGain2TxPower(desc, tx_gains[chan]);
+}
+double blade_device::getPowerAttenuation(size_t chan) {
+	dev_band_desc desc;
+	if (chan >= tx_gains.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0f;
+	}
+
+	get_dev_band_desc(desc);
+	return desc.nom_out_tx_power - TxGain2TxPower(desc, tx_gains[chan]);
+}
+
+int blade_device::getNominalTxPower(size_t chan)
+{
+	dev_band_desc desc;
+	get_dev_band_desc(desc);
+
+	return desc.nom_out_tx_power;
+}
+
+
+int blade_device::open(const std::string &args, int ref, bool swap_channels)
+{
+
+	bladerf_log_set_verbosity(BLADERF_LOG_LEVEL_VERBOSE);
+	bladerf_set_usb_reset_on_open(true);
+	auto success = bladerf_open(&dev, args.c_str());
+	if(success != 0) {
+		struct bladerf_devinfo* info;
+		auto num_devs = bladerf_get_device_list(&info);
+		LOGC(DDEV, ALERT) << "No bladerf devices found with identifier '" << args << "'";
+		if(num_devs) {
+			for(int i=0; i < num_devs; i++)
+				LOGC(DDEV, ALERT) << "Found device:" << info[i].product << " serial " << info[i].serial;
+		}
+
+		return -1;
+	}
+	if(strcmp("bladerf2", bladerf_get_board_name(dev))) {
+		LOGC(DDEV, ALERT) << "Only BladeRF2 supported! found:" << bladerf_get_board_name(dev) ;
+		return -1;
+	}
+
+	dev_type = blade_dev_type::BLADE2;
+	tx_window = TX_WINDOW_FIXED;
+	
+	struct bladerf_devinfo info;
+	bladerf_get_devinfo(dev, &info);
+	// Use the first found device
+	LOGC(DDEV, INFO) << "Using discovered bladerf device " << info.serial;
+
+
+	tx_freqs.resize(chans);
+	rx_freqs.resize(chans);
+	tx_gains.resize(chans);
+	rx_gains.resize(chans);
+	rx_buffers.resize(chans);
+
+	switch (ref) {
+	case REF_INTERNAL:
+	case REF_EXTERNAL:
+		break;
+	default:
+		LOGC(DDEV, ALERT) << "Invalid reference type";
+		return -1;
+	}
+
+	if(ref == REF_EXTERNAL) {
+		bool is_locked;
+		int status = bladerf_set_pll_enable(dev, true);
+		CHKRET()
+		status = bladerf_set_pll_refclk(dev, 10000000);
+		CHKRET()
+		for(int i=0; i < 20; i++) {
+			usleep(50*1000);
+			status = bladerf_get_pll_lock_state(dev, &is_locked);
+			CHKRET()
+			if(is_locked)
+				break;
+		}
+		if(!is_locked) {
+			LOGC(DDEV, ALERT) << "unable to lock refclk!";
+			return -1;
+		}
+	}
+
+	LOGC(DDEV, INFO) << "Selected clock source is " << ((ref == REF_INTERNAL) ? "internal" : "external 10Mhz");
+
+	set_rates();
+
+/*
+	1ts = 3/5200s
+	1024*2 = small gap(~180us) every 9.23ms = every 16 ts? -> every 2 frames
+	1024*1 = large gap(~627us) every 9.23ms = every 16 ts? -> every 2 frames
+
+	rif convertbuffer = 625*4 = 2500 -> 4 ts
+	rif rxtxbuf = 4 * segment(625*4) = 10000 -> 16 ts
+*/
+    const unsigned int num_buffers   = 256;
+    const unsigned int buffer_size   = 1024*4; /* Must be a multiple of 1024 */
+    const unsigned int num_transfers = 32;
+    const unsigned int timeout_ms    = 3500;
+
+
+    bladerf_sync_config(dev, BLADERF_RX_X1, BLADERF_FORMAT_SC16_Q11_META,
+                                 num_buffers, buffer_size, num_transfers,
+                                 timeout_ms);
+
+    bladerf_sync_config(dev, BLADERF_TX_X1, BLADERF_FORMAT_SC16_Q11_META,
+                                 num_buffers, buffer_size, num_transfers,
+                                 timeout_ms);
+
+
+
+
+	/* Number of samples per over-the-wire packet */
+	tx_spp = rx_spp = buffer_size;
+
+	// Create receive buffer
+	size_t buf_len = SAMPLE_BUF_SZ / sizeof(uint32_t);
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		rx_buffers[i] = new smpl_buf(buf_len);
+
+	// Create vector buffer
+	pkt_bufs = std::vector<std::vector<short> >(chans, std::vector<short>(2 * rx_spp));
+	for (size_t i = 0; i < pkt_bufs.size(); i++)
+		pkt_ptrs.push_back(&pkt_bufs[i].front());
+
+	// Initialize and shadow gain values
+	init_gains();
+
+	return NORMAL;
+}
+
+
+bool blade_device::restart()
+{
+	/* Allow 100 ms delay to align multi-channel streams */
+	double delay = 0.2;
+	int status;
+
+	status = bladerf_enable_module(dev, BLADERF_CHANNEL_RX(0), true);
+	CHKRET()
+	status = bladerf_enable_module(dev, BLADERF_CHANNEL_TX(0), true);
+	CHKRET()
+
+	bladerf_timestamp now;
+	status = bladerf_get_timestamp(dev, BLADERF_RX, &now);
+	ts_initial = now + rx_rate * delay;
+	LOGC(DDEV, INFO) << "Initial timestamp " << ts_initial << std::endl;
+
+	return true;
+}
+
+bool blade_device::start()
+{
+	LOGC(DDEV, INFO) << "Starting USRP...";
+
+	if (started) {
+		LOGC(DDEV, ERROR) << "Device already started";
+		return false;
+	}
+
+	// Start streaming
+	if (!restart())
+		return false;
+
+
+	started = true;
+	return true;
+}
+
+bool blade_device::stop()
+{
+	if (!started)
+		return false;
+
+	/* reset internal buffer timestamps */
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		rx_buffers[i]->reset();
+
+	band_ass_curr_sess = false;
+
+	started = false;
+	return true;
+}
+
+int blade_device::readSamples(std::vector<short *> &bufs, int len, bool *overrun,
+			    TIMESTAMP timestamp, bool *underrun)
+{
+	ssize_t rc;
+	uint64_t ts;
+
+	if (bufs.size() != chans) {
+		LOGC(DDEV, ALERT) << "Invalid channel combination " << bufs.size();
+		return -1;
+	}
+
+	*overrun = false;
+	*underrun = false;
+
+	// Shift read time with respect to transmit clock
+	timestamp += ts_offset;
+
+	ts = timestamp;
+	LOGC(DDEV, DEBUG) << "Requested timestamp = " << ts;
+
+	// Check that timestamp is valid
+	rc = rx_buffers[0]->avail_smpls(timestamp);
+	if (rc < 0) {
+		LOGC(DDEV, ERROR) << rx_buffers[0]->str_code(rc);
+		LOGC(DDEV, ERROR) << rx_buffers[0]->str_status(timestamp);
+		return 0;
+	}
+
+	
+	struct bladerf_metadata meta = {};
+	meta.timestamp = ts;
+	//static bool first_rx = true;
+	// meta.timestamp = (first_rx) ? ts : 0;
+	// meta.flags = (!first_rx) ? 0:BLADERF_META_FLAG_RX_NOW;
+	// if(first_rx)
+	// 	first_rx = false;
+
+	// Receive samples from the usrp until we have enough
+	while (rx_buffers[0]->avail_smpls(timestamp) < len) {
+		thread_enable_cancel(false);
+		int status = bladerf_sync_rx(dev, pkt_ptrs[0], len, &meta, 200U);
+		thread_enable_cancel(true);
+
+		if(status != 0)
+			std::cerr << "RX fucked: " << bladerf_strerror(status);
+		if(meta.flags & BLADERF_META_STATUS_OVERRUN )
+			std::cerr << "RX fucked OVER: " << bladerf_strerror(status);
+
+		size_t num_smpls = meta.actual_count;
+;		ts = meta.timestamp;
+
+		for (size_t i = 0; i < rx_buffers.size(); i++) {
+			rc = rx_buffers[i]->write((short *) &pkt_bufs[i].front(),
+						  num_smpls,
+						  ts);
+
+			// Continue on local overrun, exit on other errors
+			if ((rc < 0)) {
+				LOGC(DDEV, ERROR) << rx_buffers[i]->str_code(rc);
+				LOGC(DDEV, ERROR) << rx_buffers[i]->str_status(timestamp);
+				if (rc != smpl_buf::ERROR_OVERFLOW)
+					return 0;
+			}
+		}
+		meta = {};
+		meta.timestamp = ts+num_smpls;
+	}
+
+	// We have enough samples
+	for (size_t i = 0; i < rx_buffers.size(); i++) {
+		rc = rx_buffers[i]->read(bufs[i], len, timestamp);
+		if ((rc < 0) || (rc != len)) {
+			LOGC(DDEV, ERROR) << rx_buffers[i]->str_code(rc);
+			LOGC(DDEV, ERROR) << rx_buffers[i]->str_status(timestamp);
+			return 0;
+		}
+	}
+
+	return len;
+}
+
+int blade_device::writeSamples(std::vector<short *> &bufs, int len, bool *underrun,
+			     unsigned long long timestamp)
+{
+	*underrun = false;
+	static bool first_tx = true;
+	struct bladerf_metadata meta = {};
+	if(first_tx) {
+		meta.timestamp = timestamp;
+		meta.flags = BLADERF_META_FLAG_TX_BURST_START;
+		first_tx = false;
+	}
+
+	thread_enable_cancel(false);
+	int status = bladerf_sync_tx(dev, (const void*)bufs[0], len, &meta, 200U);
+	//size_t num_smpls = tx_stream->send(bufs, len, metadata);
+	thread_enable_cancel(true);
+
+	if(status != 0)
+		std::cerr << "TX fucked: " << bladerf_strerror(status);
+
+	// LOGCHAN(0, DDEV, INFO) << "tx " << timestamp << " " << len << " t+l: "<< timestamp+len << std::endl;
+
+	return len;
+}
+
+bool blade_device::updateAlignment(TIMESTAMP timestamp)
+{
+	return true;
+}
+
+bool blade_device::set_freq(double freq, size_t chan, bool tx)
+{
+
+	if (tx) {
+		bladerf_set_frequency(dev, BLADERF_CHANNEL_TX(chan), freq);
+		bladerf_frequency f;
+		bladerf_get_frequency(dev,BLADERF_CHANNEL_TX(chan), &f);
+		tx_freqs[chan] = f;
+	} else {
+		bladerf_set_frequency(dev, BLADERF_CHANNEL_RX(chan), freq);
+		bladerf_frequency f;
+		bladerf_get_frequency(dev,BLADERF_CHANNEL_RX(chan), &f);
+		rx_freqs[chan] = f;
+	}
+	LOGCHAN(chan, DDEV, INFO) << "set_freq(" << freq << ", " << (tx  ? "TX" : "RX") << "): "  << std::endl;
+
+
+	return true;
+}
+
+bool blade_device::setTxFreq(double wFreq, size_t chan)
+{
+	uint16_t req_arfcn;
+	enum gsm_band req_band;
+
+	if (chan >= tx_freqs.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return false;
+	}
+	ScopedLock lock(tune_lock);
+
+	req_arfcn = gsm_freq102arfcn(wFreq / 1000 / 100 , 0);
+	if (req_arfcn == 0xffff) {
+		LOGCHAN(chan, DDEV, ALERT) << "Unknown ARFCN for Tx Frequency " << wFreq / 1000 << " kHz";
+		return false;
+	}
+	if (gsm_arfcn2band_rc(req_arfcn, &req_band) < 0) {
+		LOGCHAN(chan, DDEV, ALERT) << "Unknown GSM band for Tx Frequency " << wFreq
+					   << " Hz (ARFCN " << req_arfcn << " )";
+		return false;
+	}
+
+	if (!set_band(req_band))
+		return false;
+
+	if (!set_freq(wFreq, chan, true))
+		return false;
+
+	return true;
+}
+
+bool blade_device::setRxFreq(double wFreq, size_t chan)
+{
+	uint16_t req_arfcn;
+	enum gsm_band req_band;
+
+	if (chan >= rx_freqs.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return false;
+	}
+	ScopedLock lock(tune_lock);
+
+	req_arfcn = gsm_freq102arfcn(wFreq / 1000 / 100, 1);
+	if (req_arfcn == 0xffff) {
+		LOGCHAN(chan, DDEV, ALERT) << "Unknown ARFCN for Rx Frequency " << wFreq / 1000 << " kHz";
+		return false;
+	}
+	if (gsm_arfcn2band_rc(req_arfcn, &req_band) < 0) {
+		LOGCHAN(chan, DDEV, ALERT) << "Unknown GSM band for Rx Frequency " << wFreq
+					   << " Hz (ARFCN " << req_arfcn << " )";
+		return false;
+	}
+
+	if (!set_band(req_band))
+		return false;
+
+	return set_freq(wFreq, chan, false);
+}
+
+double blade_device::getTxFreq(size_t chan)
+{
+	if (chan >= tx_freqs.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0;
+	}
+
+	return tx_freqs[chan];
+}
+
+double blade_device::getRxFreq(size_t chan)
+{
+	if (chan >= rx_freqs.size()) {
+		LOGC(DDEV, ALERT) << "Requested non-existent channel " << chan;
+		return 0.0;
+	}
+
+	return rx_freqs[chan];
+}
+
+bool blade_device::requiresRadioAlign()
+{
+	return false;
+}
+
+GSM::Time blade_device::minLatency() {
+	/* Empirical data from a handful of
+	relatively recent machines shows that the B100 will underrun when
+	the transmit threshold is reduced to a time of 6 and a half frames,
+	so we set a minimum 7 frame threshold. */
+	return GSM::Time(6,7);
+}
+
+TIMESTAMP blade_device::initialWriteTimestamp()
+{
+	return ts_initial;
+}
+
+TIMESTAMP blade_device::initialReadTimestamp()
+{
+	return ts_initial;
+}
+
+double blade_device::fullScaleInputValue()
+{
+		return (double) 2047;
+}
+
+double blade_device::fullScaleOutputValue()
+{
+	return (double) 2047;
+}
+
+
+#ifndef IPCMAGIC
+RadioDevice *RadioDevice::make(size_t tx_sps, size_t rx_sps,
+			       InterfaceType iface, size_t chans, double lo_offset,
+			       const std::vector<std::string>& tx_paths,
+			       const std::vector<std::string>& rx_paths)
+{
+	return new blade_device(tx_sps, rx_sps, iface, chans, lo_offset, tx_paths, rx_paths);
+}
+#endif

Transceiver52M/device/bladerf/bladerf.h

@@ -0,0 +1,171 @@
+/*
+ * Copyright 2022 sysmocom - s.f.m.c. GmbH
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * SPDX-License-Identifier: AGPL-3.0+
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * See the COPYING file in the main directory for details.
+ */
+
+#pragma once
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "radioDevice.h"
+#include "smpl_buf.h"
+
+extern "C" {
+#include <osmocom/gsm/gsm_utils.h>
+}
+
+#include <bladerf.h>
+
+enum class blade_dev_type {
+	BLADE1,
+	BLADE2
+};
+
+struct dev_band_desc {
+	/* Maximum UHD Tx Gain which can be set/used without distorting the
+	   output signal, and the resulting real output power measured when that
+	   gain is used. Correct measured values only provided for B210 so far. */
+	double nom_uhd_tx_gain;  /* dB */
+	double nom_out_tx_power; /* dBm */
+	/* Factor used to infer base real RSSI offset on the Rx path based on current
+	   configured RxGain. The resulting rssiOffset is added to the per burst
+	   calculated energy in upper layers. These values were empirically
+	   found and may change based on multiple factors, see OS#4468.
+	   rssiOffset = rxGain + rxgain2rssioffset_rel;
+	*/
+	double rxgain2rssioffset_rel; /* dB */
+};
+
+class blade_device : public RadioDevice {
+public:
+	blade_device(size_t tx_sps, size_t rx_sps, InterfaceType type,
+		   size_t chan_num, double offset,
+		   const std::vector<std::string>& tx_paths,
+		   const std::vector<std::string>& rx_paths);
+	~blade_device();
+
+	int open(const std::string &args, int ref, bool swap_channels);
+	bool start();
+	bool stop();
+	bool restart();
+	enum TxWindowType getWindowType() { return tx_window; }
+
+	int readSamples(std::vector<short *> &bufs, int len, bool *overrun,
+			TIMESTAMP timestamp, bool *underrun);
+
+	int writeSamples(std::vector<short *> &bufs, int len, bool *underrun,
+			 TIMESTAMP timestamp);
+
+	bool updateAlignment(TIMESTAMP timestamp);
+
+	bool setTxFreq(double wFreq, size_t chan);
+	bool setRxFreq(double wFreq, size_t chan);
+
+	TIMESTAMP initialWriteTimestamp();
+	TIMESTAMP initialReadTimestamp();
+
+	double fullScaleInputValue();
+	double fullScaleOutputValue();
+
+	double setRxGain(double db, size_t chan);
+	double getRxGain(size_t chan);
+	double maxRxGain(void) { return rx_gain_max; }
+	double minRxGain(void) { return rx_gain_min; }
+	double rssiOffset(size_t chan);
+
+	double setPowerAttenuation(int atten, size_t chan);
+	double getPowerAttenuation(size_t chan = 0);
+
+	int getNominalTxPower(size_t chan = 0);
+
+	double getTxFreq(size_t chan);
+	double getRxFreq(size_t chan);
+	double getRxFreq();
+
+	bool setRxAntenna(const std::string &ant, size_t chan) { return {};};
+	std::string getRxAntenna(size_t chan) { return {};};
+	bool setTxAntenna(const std::string &ant, size_t chan) { return {};};
+	std::string getTxAntenna(size_t chan) { return {};};
+
+	bool requiresRadioAlign();
+
+	GSM::Time minLatency();
+
+	inline double getSampleRate() { return tx_rate; }
+
+	/** Receive and process asynchronous message
+	    @return true if message received or false on timeout or error
+	*/
+	bool recv_async_msg();
+
+	enum err_code {
+		ERROR_TIMING = -1,
+		ERROR_TIMEOUT = -2,
+		ERROR_UNRECOVERABLE = -3,
+		ERROR_UNHANDLED = -4,
+	};
+
+protected:
+	struct bladerf* dev;
+	void* usrp_dev;
+
+	enum TxWindowType tx_window;
+	enum blade_dev_type dev_type;
+
+	double tx_rate, rx_rate;
+
+	double rx_gain_min, rx_gain_max;
+
+	std::vector<double> tx_gains, rx_gains;
+	std::vector<double> tx_freqs, rx_freqs;
+	bool band_ass_curr_sess; /* true if  "band" was set after last POWEROFF */
+	enum gsm_band band;
+	struct dev_band_desc band_desc;
+	size_t tx_spp, rx_spp;
+
+	bool started;
+	bool aligned;
+
+	size_t drop_cnt;
+	uint64_t prev_ts;
+
+	TIMESTAMP ts_initial, ts_offset;
+	std::vector<smpl_buf *> rx_buffers;
+	/* Sample buffers used to receive samples: */
+	std::vector<std::vector<short> > pkt_bufs;
+	/* Used to call UHD API: Buffer pointer of each elem in pkt_ptrs will
+	   point to corresponding buffer of vector pkt_bufs. */
+	std::vector<short *> pkt_ptrs;
+
+	void init_gains();
+	void set_channels(bool swap);
+	void set_rates();
+	bool flush_recv(size_t num_pkts);
+
+	bool set_freq(double freq, size_t chan, bool tx);
+	void get_dev_band_desc(dev_band_desc& desc);
+	bool set_band(enum gsm_band req_band);
+	void assign_band_desc(enum gsm_band req_band);
+
+	Thread *async_event_thrd;
+	Mutex tune_lock;
+};

Transceiver52M/device/common/radioDevice.h

@@ -169,14 +169,13 @@ class RadioDevice {
               const std::vector<std::string>& tx_paths,
               const std::vector<std::string>& rx_paths):
 		tx_sps(tx_sps), rx_sps(rx_sps), iface(type), chans(chan_num), lo_offset(offset),
-		tx_paths(tx_paths), rx_paths(rx_paths)
+		tx_paths(tx_paths), rx_paths(rx_paths), m_ctr(chans)
 	{
 		if (iface == MULTI_ARFCN) {
 			LOGC(DDEV, INFO) << "Multi-ARFCN: "<< chan_num << " logical chans -> 1 physical chans";
 			chans = 1;
 		}
 
-		m_ctr.resize(chans);
 		for (size_t i = 0; i < chans; i++) {
 			memset(&m_ctr[i], 0, sizeof(m_ctr[i]));
 			m_ctr[i].chan = i;

Transceiver52M/device/ipc/IPCDevice.cpp

@@ -58,18 +58,12 @@ static int ipc_chan_sock_cb(struct osmo_fd *bfd, unsigned int flags);
 
 IPCDevice::IPCDevice(size_t tx_sps, size_t rx_sps, InterfaceType iface, size_t chan_num, double lo_offset,
 		     const std::vector<std::string> &tx_paths, const std::vector<std::string> &rx_paths)
-	: RadioDevice(tx_sps, rx_sps, iface, chan_num, lo_offset, tx_paths, rx_paths), tx_attenuation(),
-	  tmp_state(IPC_IF_MSG_GREETING_REQ), shm(NULL), shm_dec(0), started(false)
+	: RadioDevice(tx_sps, rx_sps, iface, chan_num, lo_offset, tx_paths, rx_paths), sk_chan_state(chans, ipc_per_trx_sock_state()),
+	  tx_attenuation(), tmp_state(IPC_IF_MSG_GREETING_REQ), shm(NULL), shm_dec(0),
+	  rx_buffers(chans), started(false), tx_gains(chans), rx_gains(chans)
 {
 	LOGC(DDEV, INFO) << "creating IPC device...";
 
-	rx_gains.resize(chans);
-	tx_gains.resize(chans);
-
-	rx_buffers.resize(chans);
-
-	sk_chan_state.resize(chans, ipc_per_trx_sock_state());
-
 	/* Set up per-channel Rx timestamp based Ring buffers */
 	for (size_t i = 0; i < rx_buffers.size(); i++)
 		rx_buffers[i] = new smpl_buf(SAMPLE_BUF_SZ / sizeof(uint32_t));

Transceiver52M/device/ipc2/IPCDevice.cpp

@@ -0,0 +1,314 @@
+/*
+* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+* Author: Pau Espin Pedrol <pespin@sysmocom.de>
+*
+* SPDX-License-Identifier: AGPL-3.0+
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+* See the COPYING file in the main directory for details.
+*/
+
+#include <sys/time.h>
+#include <osmocom/core/timer_compat.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "Logger.h"
+#include "Threads.h"
+#include "IPCDevice.h"
+#include "smpl_buf.h"
+
+#define SAMPLE_BUF_SZ (1 << 20)
+static const auto ONE_BIT_DURATION ((12./5200.)/(156.25*4.));
+static const auto ONE_SAMPLE_DURATION_US ((ONE_BIT_DURATION/4.)*1000*1000);
+using namespace std;
+
+IPCDevice2::IPCDevice2(size_t tx_sps, size_t rx_sps, InterfaceType iface, size_t chan_num, double lo_offset,
+		       const std::vector<std::string> &tx_paths, const std::vector<std::string> &rx_paths)
+	: RadioDevice(tx_sps, rx_sps, iface, chan_num, lo_offset, tx_paths, rx_paths), rx_buffers(chans),
+	  started(false), tx_gains(chans), rx_gains(chans)
+{
+	LOGC(DDEV, INFO) << "creating IPC device...";
+
+	if (!(tx_sps == 4) || !(rx_sps == 4)) {
+		LOGC(DDEV, FATAL) << "IPC shm if create failed!";
+		exit(0);
+	}
+
+	/* Set up per-channel Rx timestamp based Ring buffers */
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		rx_buffers[i] = new smpl_buf(SAMPLE_BUF_SZ / sizeof(uint32_t));
+
+	if (!m.create()) {
+		LOGC(DDEV, FATAL) << "IPC shm if create failed!";
+		exit(0);
+	}
+}
+
+IPCDevice2::~IPCDevice2()
+{
+	LOGC(DDEV, INFO) << "Closing IPC device";
+	/* disable all channels */
+
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		delete rx_buffers[i];
+}
+
+int IPCDevice2::open(const std::string &args, int ref, bool swap_channels)
+{
+	std::string k, v;
+
+	/* configure antennas */
+	if (!set_antennas()) {
+		LOGC(DDEV, FATAL) << "IPC antenna setting failed";
+		goto out_close;
+	}
+
+	return iface == MULTI_ARFCN ? MULTI_ARFCN : NORMAL;
+
+out_close:
+	LOGC(DDEV, FATAL) << "Error in IPC open, closing";
+	return -1;
+}
+
+bool IPCDevice2::start()
+{
+	LOGC(DDEV, INFO) << "starting IPC...";
+
+	if (started) {
+		LOGC(DDEV, ERR) << "Device already started";
+		return true;
+	}
+
+	int max_bufs_to_flush = 120;
+	flush_recv(max_bufs_to_flush);
+
+	started = true;
+	return true;
+}
+
+bool IPCDevice2::stop()
+{
+	if (!started)
+		return true;
+
+	LOGC(DDEV, NOTICE) << "All channels stopped, terminating...";
+
+	/* reset internal buffer timestamps */
+	for (size_t i = 0; i < rx_buffers.size(); i++)
+		rx_buffers[i]->reset();
+
+	started = false;
+	return true;
+}
+
+double IPCDevice2::maxRxGain()
+{
+	return 70;
+}
+
+double IPCDevice2::minRxGain()
+{
+	return 0;
+}
+
+int IPCDevice2::getNominalTxPower(size_t chan)
+{
+	return 10;
+}
+
+double IPCDevice2::setPowerAttenuation(int atten, size_t chan)
+{
+	return atten;
+}
+
+double IPCDevice2::getPowerAttenuation(size_t chan)
+{
+	return 0;
+}
+
+double IPCDevice2::setRxGain(double dB, size_t chan)
+{
+	if (dB > maxRxGain())
+		dB = maxRxGain();
+	if (dB < minRxGain())
+		dB = minRxGain();
+
+	LOGCHAN(chan, DDEV, NOTICE) << "Setting RX gain to " << dB << " dB";
+
+	return dB;
+}
+
+bool IPCDevice2::flush_recv(size_t num_pkts)
+{
+	ts_initial = 10000;
+
+	LOGC(DDEV, INFO) << "Initial timestamp " << ts_initial << std::endl;
+	return true;
+}
+
+bool IPCDevice2::setRxAntenna(const std::string &ant, size_t chan)
+{
+	return true;
+}
+
+std::string IPCDevice2::getRxAntenna(size_t chan)
+{
+	return "";
+}
+
+bool IPCDevice2::setTxAntenna(const std::string &ant, size_t chan)
+{
+	return true;
+}
+
+std::string IPCDevice2::getTxAntenna(size_t chan)
+{
+	return "";
+}
+
+bool IPCDevice2::requiresRadioAlign()
+{
+	return false;
+}
+
+GSM::Time IPCDevice2::minLatency()
+{
+	/* UNUSED */
+	return GSM::Time(0, 0);
+}
+
+/** Returns the starting write Timestamp*/
+TIMESTAMP IPCDevice2::initialWriteTimestamp(void)
+{
+	return ts_initial;
+}
+
+/** Returns the starting read Timestamp*/
+TIMESTAMP IPCDevice2::initialReadTimestamp(void)
+{
+	return ts_initial;
+}
+
+static timespec readtime, writetime;
+static void wait_for_sample_time(timespec* last, unsigned int len) {
+	timespec ts, diff;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	timespecsub(&ts, last, &diff);
+	auto elapsed_us = (diff.tv_sec * 1000000) + (diff.tv_nsec / 1000);
+	auto max_wait_us = ONE_SAMPLE_DURATION_US * len;
+	if(elapsed_us < max_wait_us)
+		usleep(max_wait_us-elapsed_us);
+	*last = ts;
+}
+
+// NOTE: Assumes sequential reads
+int IPCDevice2::readSamples(std::vector<short *> &bufs, int len, bool *overrun, TIMESTAMP timestamp, bool *underrun)
+{
+	int rc, num_smpls; //, expect_smpls;
+	ssize_t avail_smpls;
+	unsigned int i = 0;
+
+	*overrun = false;
+	*underrun = false;
+
+	timestamp += 0;
+
+	/* Check that timestamp is valid */
+	rc = rx_buffers[0]->avail_smpls(timestamp);
+	if (rc < 0) {
+		LOGC(DDEV, ERROR) << rx_buffers[0]->str_code(rc);
+		LOGC(DDEV, ERROR) << rx_buffers[0]->str_status(timestamp);
+		return 0;
+	}
+
+	/* Receive samples from HW until we have enough */
+	while ((avail_smpls = rx_buffers[i]->avail_smpls(timestamp)) < len) {
+		uint64_t recv_timestamp = timestamp;
+
+		m.read_ul(len - avail_smpls, &recv_timestamp, reinterpret_cast<sample_t *>(bufs[0]));
+		num_smpls = len - avail_smpls;
+		wait_for_sample_time(&readtime, num_smpls);
+
+		if (num_smpls == -ETIMEDOUT)
+			continue;
+
+		LOGCHAN(i, DDEV, DEBUG)
+		"Received timestamp = " << (TIMESTAMP)recv_timestamp << " (" << num_smpls << ")";
+
+		rc = rx_buffers[i]->write(bufs[i], num_smpls, (TIMESTAMP)recv_timestamp);
+		if (rc < 0) {
+			LOGCHAN(i, DDEV, ERROR)
+				<< rx_buffers[i]->str_code(rc) << " num smpls: " << num_smpls << " chan: " << i;
+			LOGCHAN(i, DDEV, ERROR) << rx_buffers[i]->str_status(timestamp);
+			if (rc != smpl_buf::ERROR_OVERFLOW)
+				return 0;
+		}
+	}
+
+	/* We have enough samples */
+
+	rc = rx_buffers[i]->read(bufs[i], len, timestamp);
+	if ((rc < 0) || (rc != len)) {
+		LOGCHAN(i, DDEV, ERROR) << rx_buffers[i]->str_code(rc) << ". " << rx_buffers[i]->str_status(timestamp)
+					<< ", (len=" << len << ")";
+		return 0;
+	}
+
+	return len;
+}
+
+int IPCDevice2::writeSamples(std::vector<short *> &bufs, int len, bool *underrun, unsigned long long timestamp)
+{
+	*underrun = false;
+
+	LOGCHAN(0, DDEV, DEBUG) << "send buffer of len " << len << " timestamp " << std::hex << timestamp;
+
+	// rc = ipc_shm_enqueue(shm_io_tx_streams[i], timestamp, len, (uint16_t *)bufs[i]);
+	m.write_dl(len, timestamp, reinterpret_cast<sample_t *>(bufs[0]));
+	wait_for_sample_time(&writetime, len);
+
+	return 0;
+}
+
+bool IPCDevice2::updateAlignment(TIMESTAMP timestamp)
+{
+	return true;
+}
+
+bool IPCDevice2::setTxFreq(double wFreq, size_t chan)
+{
+	return true;
+}
+
+bool IPCDevice2::setRxFreq(double wFreq, size_t chan)
+{
+	return true;
+}
+
+RadioDevice *RadioDevice::make(size_t tx_sps, size_t rx_sps, InterfaceType iface, size_t chans, double lo_offset,
+			       const std::vector<std::string> &tx_paths, const std::vector<std::string> &rx_paths)
+{
+	if (tx_sps != rx_sps) {
+		LOGC(DDEV, ERROR) << "IPC Requires tx_sps == rx_sps";
+		return NULL;
+	}
+	if (lo_offset != 0.0) {
+		LOGC(DDEV, ERROR) << "IPC doesn't support lo_offset";
+		return NULL;
+	}
+	return new IPCDevice2(tx_sps, rx_sps, iface, chans, lo_offset, tx_paths, rx_paths);
+}

Transceiver52M/device/ipc2/IPCDevice.h

@@ -0,0 +1,186 @@
+/*
+* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+* Author: Pau Espin Pedrol <pespin@sysmocom.de>
+*
+* SPDX-License-Identifier: AGPL-3.0+
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+* See the COPYING file in the main directory for details.
+*/
+
+#ifndef _IPC_DEVICE_H_
+#define _IPC_DEVICE_H_
+
+
+#include <climits>
+#include <string>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "radioDevice.h"
+#include "ipcif.h"
+
+class smpl_buf;
+
+class IPCDevice2 : public RadioDevice {
+	trxmsif m;
+    protected:
+	std::vector<smpl_buf *> rx_buffers;
+	double actualSampleRate;
+
+	bool started;
+
+	TIMESTAMP ts_initial;
+
+	std::vector<double> tx_gains, rx_gains;
+
+	bool flush_recv(size_t num_pkts);
+	void update_stream_stats_rx(size_t chan, bool *overrun);
+	void update_stream_stats_tx(size_t chan, bool *underrun);
+
+	bool send_chan_wait_rsp(uint32_t chan, struct msgb *msg_to_send, uint32_t expected_rsp_msg_id);
+	bool send_all_chan_wait_rsp(uint32_t msgid_to_send, uint32_t msgid_to_expect);
+
+    public:
+	/** Object constructor */
+	IPCDevice2(size_t tx_sps, size_t rx_sps, InterfaceType iface, size_t chan_num, double lo_offset,
+		   const std::vector<std::string> &tx_paths, const std::vector<std::string> &rx_paths);
+	virtual ~IPCDevice2() override;
+
+	/** Instantiate the IPC */
+	virtual int open(const std::string &args, int ref, bool swap_channels) override;
+
+	/** Start the IPC */
+	virtual bool start() override;
+
+	/** Stop the IPC */
+	virtual bool stop() override;
+
+	/* FIXME: any != USRP1 will do for now... */
+	enum TxWindowType getWindowType() override
+	{
+		return TX_WINDOW_FIXED;
+	}
+
+	/**
+	Read samples from the IPC.
+	@param buf preallocated buf to contain read result
+	@param len number of samples desired
+	@param overrun Set if read buffer has been overrun, e.g. data not being read fast enough
+	@param timestamp The timestamp of the first samples to be read
+	@param underrun Set if IPC does not have data to transmit, e.g. data not being sent fast enough
+	@return The number of samples actually read
+	*/
+	virtual int readSamples(std::vector<short *> &buf, int len, bool *overrun, TIMESTAMP timestamp = 0xffffffff,
+				bool *underrun = NULL) override;
+	/**
+	Write samples to the IPC.
+	@param buf Contains the data to be written.
+	@param len number of samples to write.
+	@param underrun Set if IPC does not have data to transmit, e.g. data not being sent fast enough
+	@param timestamp The timestamp of the first sample of the data buffer.
+	@return The number of samples actually written
+	*/
+	virtual int writeSamples(std::vector<short *> &bufs, int len, bool *underrun,
+				 TIMESTAMP timestamp = 0xffffffff) override;
+
+	/** Update the alignment between the read and write timestamps */
+	virtual bool updateAlignment(TIMESTAMP timestamp) override;
+
+	/** Set the transmitter frequency */
+	virtual bool setTxFreq(double wFreq, size_t chan = 0) override;
+
+	/** Set the receiver frequency */
+	virtual bool setRxFreq(double wFreq, size_t chan = 0) override;
+
+	/** Returns the starting write Timestamp*/
+	virtual TIMESTAMP initialWriteTimestamp(void) override;
+
+	/** Returns the starting read Timestamp*/
+	virtual TIMESTAMP initialReadTimestamp(void) override;
+
+	/** returns the full-scale transmit amplitude **/
+	virtual double fullScaleInputValue() override
+	{
+		return (double)SHRT_MAX * 1;
+	}
+
+	/** returns the full-scale receive amplitude **/
+	virtual double fullScaleOutputValue() override
+	{
+		return (double)SHRT_MAX * 1;
+	}
+
+	/** sets the receive chan gain, returns the gain setting **/
+	virtual double setRxGain(double dB, size_t chan = 0) override;
+
+	/** get the current receive gain */
+	virtual double getRxGain(size_t chan = 0) override
+	{
+		return rx_gains[chan];
+	}
+
+	/** return maximum Rx Gain **/
+	virtual double maxRxGain(void) override;
+
+	/** return minimum Rx Gain **/
+	virtual double minRxGain(void) override;
+
+	/* FIXME: return rx_gains[chan] ? receive factor from IPC Driver? */
+	double rssiOffset(size_t chan) override
+	{
+		return 0.0f;
+	};
+
+	double setPowerAttenuation(int atten, size_t chan) override;
+	double getPowerAttenuation(size_t chan = 0) override;
+
+	virtual int getNominalTxPower(size_t chan = 0) override;
+
+	/** sets the RX path to use, returns true if successful and false otherwise */
+	virtual bool setRxAntenna(const std::string &ant, size_t chan = 0) override;
+
+	/* return the used RX path */
+	virtual std::string getRxAntenna(size_t chan = 0) override;
+
+	/** sets the RX path to use, returns true if successful and false otherwise */
+	virtual bool setTxAntenna(const std::string &ant, size_t chan = 0) override;
+
+	/* return the used RX path */
+	virtual std::string getTxAntenna(size_t chan = 0) override;
+
+	/** return whether user drives synchronization of Tx/Rx of USRP */
+	virtual bool requiresRadioAlign() override;
+
+	/** return whether user drives synchronization of Tx/Rx of USRP */
+	virtual GSM::Time minLatency() override;
+
+	/** Return internal status values */
+	virtual inline double getTxFreq(size_t chan = 0) override
+	{
+		return 0;
+	}
+	virtual inline double getRxFreq(size_t chan = 0) override
+	{
+		return 0;
+	}
+	virtual inline double getSampleRate() override
+	{
+		return actualSampleRate;
+	}
+};
+
+#endif // _IPC_DEVICE_H_

Transceiver52M/device/ipc2/Makefile.am

@@ -0,0 +1,14 @@
+include $(top_srcdir)/Makefile.common
+
+AM_CPPFLAGS = -Wall $(STD_DEFINES_AND_INCLUDES) -I${srcdir}/../common
+AM_CFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS)
+AM_CXXFLAGS = -lpthread $(LIBOSMOCORE_CFLAGS)
+AM_LDFLAGS = -lpthread -lrt
+
+noinst_HEADERS = IPCDevice.h
+
+noinst_LTLIBRARIES = libdevice.la
+
+libdevice_la_SOURCES = IPCDevice.cpp
+libdevice_la_LIBADD = $(top_builddir)/Transceiver52M/device/common/libdevice_common.la
+libdevice_la_CXXFLAGS = $(AM_CXXFLAGS) -DIPCMAGIC

Transceiver52M/device/ipc2/ipcif.h

@@ -0,0 +1,161 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+ 
+#pragma once
+
+#include <atomic>
+#include <complex>
+#include <cassert>
+#include "shmif.h"
+
+const int max_ul_rdlen = 1024 * 10;
+const int max_dl_rdlen = 1024 * 10;
+using sample_t = std::complex<int16_t>;
+struct shm_if {
+	std::atomic<bool> ms_connected;
+	struct {
+		shm::shmmutex m;
+		shm::shmcond c;
+		std::atomic<uint64_t> ts;
+		std::atomic<size_t> len_req; // <-
+		std::atomic<size_t> len_written; // ->
+		sample_t buffer[max_ul_rdlen];
+	} ul;
+	struct {
+		shm::shmmutex writemutex;
+		shm::shmcond rdy2write;
+		shm::shmmutex readmutex;
+		shm::shmcond rdy2read;
+		std::atomic<uint64_t> ts;
+		std::atomic<size_t> len_req;
+		std::atomic<size_t> len_written;
+		sample_t buffer[max_dl_rdlen];
+	} dl;
+};
+
+// unique up to signed_type/2 diff
+template <typename A> auto unsigned_diff(A a, A b) -> typename std::make_signed<A>::type
+{
+	using stype = typename std::make_signed<A>::type;
+	return (a > b) ? static_cast<stype>(a - b) : -static_cast<stype>(b - a);
+};
+
+class trxmsif {
+	shm::shm<shm_if> m;
+	shm_if *ptr;
+	int dl_readoffset;
+
+	int samp2byte(int v)
+	{
+		return v * sizeof(sample_t);
+	}
+
+    public:
+	trxmsif() : m("trx-ms-if"), dl_readoffset(0)
+	{
+	}
+
+	bool create()
+	{
+		m.create();
+		ptr = m.p();
+		return m.isgood();
+	}
+	bool connect()
+	{
+		m.open();
+		ptr = m.p();
+		ptr->ms_connected = true;
+		return m.isgood();
+	}
+	bool good()
+	{
+		return m.isgood();
+	}
+
+	void write_dl(size_t howmany, uint64_t write_ts, sample_t *inbuf)
+	{
+		auto &dl = ptr->dl;
+		auto buf = &dl.buffer[0];
+		// if (ptr->ms_connected != true)
+		// 	return;
+
+		assert(sizeof(dl.buffer) >= samp2byte(howmany));
+
+		{
+			shm::signal_guard g(dl.writemutex, dl.rdy2write, dl.rdy2read);
+
+			memcpy(buf, inbuf, samp2byte(howmany));
+			dl.ts = write_ts;
+			dl.len_written = howmany;
+		}
+	}
+
+	void read_dl(size_t howmany, uint64_t* read_ts, sample_t *outbuf)
+	{
+		auto &dl = ptr->dl;
+		auto buf = &dl.buffer[0];
+		size_t len_avail = dl.len_written;
+		uint64_t ts = dl.ts;
+
+		auto left_to_read = len_avail - dl_readoffset;
+
+		// no data, wait for new buffer, maybe some data left afterwards
+		if (!left_to_read) {
+			shm::signal_guard g(dl.readmutex, dl.rdy2read, dl.rdy2write);
+			*read_ts = dl.ts;
+			len_avail = dl.len_written;
+			dl_readoffset += howmany;
+			assert(len_avail >= howmany);
+			memcpy(outbuf, buf, samp2byte(howmany));
+			return;
+		}
+
+		*read_ts = dl.ts + dl_readoffset;
+		left_to_read = len_avail - dl_readoffset;
+
+		// data left from prev read
+		if (left_to_read >= howmany) {
+			memcpy(outbuf, buf, samp2byte(howmany));
+			dl_readoffset += howmany;
+			return;
+		} else {
+			memcpy(outbuf, buf, samp2byte(left_to_read));
+			dl_readoffset = 0;
+			auto still_left_to_read = howmany - left_to_read;
+			{
+				shm::signal_guard g(dl.readmutex, dl.rdy2read, dl.rdy2write);
+				len_avail = dl.len_written;
+				dl_readoffset += still_left_to_read;
+				assert(len_avail >= still_left_to_read);
+				memcpy(outbuf + left_to_read, buf, samp2byte(still_left_to_read));
+			}
+		}
+	}
+
+	void read_ul(size_t howmany, uint64_t* read_ts, sample_t *outbuf)
+	{
+		// if (ptr->ms_connected != true) {
+		memset(outbuf, 0, samp2byte(howmany));
+		return;
+		// }
+	}
+};

Transceiver52M/device/ipc2/shmif.h

@@ -0,0 +1,219 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+ 
+#pragma once
+
+#include <cstring>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <cerrno>
+
+namespace shm
+{
+
+class shmmutex {
+	pthread_mutex_t mutex;
+
+    public:
+	shmmutex()
+	{
+		pthread_mutexattr_t attr;
+		pthread_mutexattr_init(&attr);
+		pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+		pthread_mutexattr_setrobust(&attr, PTHREAD_MUTEX_ROBUST);
+		pthread_mutex_init(&mutex, &attr);
+		pthread_mutexattr_destroy(&attr);
+	}
+
+	~shmmutex()
+	{
+		pthread_mutex_destroy(&mutex);
+	}
+
+	void lock()
+	{
+		pthread_mutex_lock(&mutex);
+	}
+
+	bool try_lock()
+	{
+		return pthread_mutex_trylock(&mutex);
+	}
+
+	void unlock()
+	{
+		pthread_mutex_unlock(&mutex);
+	}
+
+	pthread_mutex_t *p()
+	{
+		return &mutex;
+	}
+};
+
+class shmcond {
+	pthread_cond_t cond;
+
+    public:
+	shmcond()
+	{
+		pthread_condattr_t attr;
+		pthread_condattr_init(&attr);
+		pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
+		pthread_cond_init(&cond, &attr);
+		pthread_condattr_destroy(&attr);
+	}
+
+	~shmcond()
+	{
+		pthread_cond_destroy(&cond);
+	}
+
+	void wait(shmmutex *lock)
+	{
+		pthread_cond_wait(&cond, lock->p());
+	}
+
+	void signal()
+	{
+		pthread_cond_signal(&cond);
+	}
+
+	void signal_all()
+	{
+		pthread_cond_broadcast(&cond);
+	}
+};
+
+template <typename IFT> class shm {
+	char shmname[512];
+	size_t IFT_sz = sizeof(IFT);
+	IFT *shmptr;
+	bool good;
+	int ipc_shm_setup(const char *shm_name)
+	{
+		int fd;
+		int rc;
+		void *ptr;
+
+		if ((fd = shm_open(shm_name, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR)) < 0) {
+			rc = -errno;
+			return rc;
+		}
+
+		if (ftruncate(fd, IFT_sz) < 0) {
+			rc = -errno;
+			shm_unlink(shm_name);
+			::close(fd);
+		}
+
+		if ((ptr = mmap(NULL, IFT_sz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+			rc = -errno;
+			shm_unlink(shm_name);
+			::close(fd);
+		}
+
+		shmptr = new (ptr) IFT(); //static_cast<IFT *>(ptr);
+		::close(fd);
+		return 0;
+	}
+
+	int ipc_shm_connect(const char *shm_name)
+	{
+		int fd;
+		int rc;
+		void *ptr;
+
+		if ((fd = shm_open(shm_name, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR)) < 0) {
+			rc = -errno;
+			return rc;
+		}
+
+		struct stat shm_stat;
+		if (fstat(fd, &shm_stat) < 0) {
+			rc = -errno;
+			shm_unlink(shm_name);
+			::close(fd);
+		}
+
+		if ((ptr = mmap(NULL, shm_stat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+			rc = -errno;
+			shm_unlink(shm_name);
+			::close(fd);
+		}
+
+		shmptr = static_cast<IFT *>(ptr);
+		::close(fd);
+		return 0;
+	}
+
+    public:
+	using IFT_t = IFT;
+	explicit shm(const char *name) : good(false)
+	{
+		strncpy((char *)shmname, name, 512);
+	}
+	void create()
+	{
+		if (ipc_shm_setup(shmname) == 0)
+			good = true;
+	}
+	void open()
+	{
+		if (ipc_shm_connect(shmname) == 0)
+			good = true;
+	}
+	bool isgood() const
+	{
+		return good;
+	}
+	void close()
+	{
+		if (isgood())
+			shm_unlink(shmname);
+	}
+	IFT *p()
+	{
+		return shmptr;
+	}
+};
+
+class signal_guard {
+	shmmutex &m;
+	shmcond &s;
+
+    public:
+	explicit signal_guard(shmmutex &m, shmcond &wait_for, shmcond &to_signal) : m(m), s(to_signal)
+	{
+		m.lock();
+		wait_for.wait(&m);
+	}
+	~signal_guard()
+	{
+		s.signal();
+		m.unlock();
+	}
+};
+
+} // namespace shm

Transceiver52M/device/ipc2/uhddev_ipc.cpp

@@ -0,0 +1 @@
+#include "../uhd/UHDDevice.cpp"

Transceiver52M/device/ipc2/uhdwrap.cpp

@@ -0,0 +1,255 @@
+/*
+* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+* Author: Eric Wild <ewild@sysmocom.de>
+*
+* SPDX-License-Identifier: 0BSD
+*
+* Permission to use, copy, modify, and/or distribute this software for any purpose
+* with or without fee is hereby granted.THE SOFTWARE IS PROVIDED "AS IS" AND THE
+* AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+* BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
+* USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+extern "C" {
+#include <osmocom/core/application.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+
+#include "shm.h"
+#include "ipc_shm.h"
+#include "ipc-driver-test.h"
+}
+#include "../uhd/UHDDevice.h"
+#include "uhdwrap.h"
+
+#include "Logger.h"
+#include "Threads.h"
+#include "Utils.h"
+
+int uhd_wrap::open(const std::string &args, int ref, bool swap_channels)
+{
+	int rv = uhd_device::open(args, ref, swap_channels);
+	samps_per_buff_rx = rx_stream->get_max_num_samps();
+	samps_per_buff_tx = tx_stream->get_max_num_samps();
+	channel_count = usrp_dev->get_rx_num_channels();
+
+	wrap_rx_buffs = std::vector<std::vector<short> >(channel_count, std::vector<short>(2 * samps_per_buff_rx));
+	for (size_t i = 0; i < wrap_rx_buffs.size(); i++)
+		wrap_rx_buf_ptrs.push_back(&wrap_rx_buffs[i].front());
+
+	wrap_tx_buffs = std::vector<std::vector<short> >(channel_count, std::vector<short>(2 * 5000));
+	for (size_t i = 0; i < wrap_tx_buffs.size(); i++)
+		wrap_tx_buf_ptrs.push_back(&wrap_tx_buffs[i].front());
+
+	return rv;
+}
+
+uhd_wrap::~uhd_wrap()
+{
+	//	drvtest::gshutdown = 1;
+	//t->join();
+}
+
+size_t uhd_wrap::bufsizerx()
+{
+	return samps_per_buff_rx;
+}
+
+size_t uhd_wrap::bufsizetx()
+{
+	return samps_per_buff_tx;
+}
+
+int uhd_wrap::chancount()
+{
+	return channel_count;
+}
+
+int uhd_wrap::wrap_read(TIMESTAMP *timestamp)
+{
+	uhd::rx_metadata_t md;
+	size_t num_rx_samps = rx_stream->recv(wrap_rx_buf_ptrs, samps_per_buff_rx, md, 0.1, true);
+	*timestamp = md.time_spec.to_ticks(rx_rate);
+	return num_rx_samps; //uhd_device::readSamples(bufs, len, overrun, timestamp, underrun);
+}
+
+extern "C" void *uhdwrap_open(struct ipc_sk_if_open_req *open_req)
+{
+	unsigned int rx_sps, tx_sps;
+
+	/* FIXME: dev arg string* */
+	/* FIXME: rx frontend bw? */
+	/* FIXME: tx frontend bw? */
+	ReferenceType cref;
+	switch (open_req->clockref) {
+	case FEATURE_MASK_CLOCKREF_EXTERNAL:
+		cref = ReferenceType::REF_EXTERNAL;
+		break;
+	case FEATURE_MASK_CLOCKREF_INTERNAL:
+	default:
+		cref = ReferenceType::REF_INTERNAL;
+		break;
+	}
+
+	std::vector<std::string> tx_paths;
+	std::vector<std::string> rx_paths;
+	for (unsigned int i = 0; i < open_req->num_chans; i++) {
+		tx_paths.push_back(open_req->chan_info[i].tx_path);
+		rx_paths.push_back(open_req->chan_info[i].rx_path);
+	}
+
+	/* FIXME: this is actually the sps value, not the sample rate!
+	 * sample rate is looked up according to the sps rate by uhd backend */
+	rx_sps = open_req->rx_sample_freq_num / open_req->rx_sample_freq_den;
+	tx_sps = open_req->tx_sample_freq_num / open_req->tx_sample_freq_den;
+	uhd_wrap *uhd_wrap_dev =
+		new uhd_wrap(tx_sps, rx_sps, RadioDevice::NORMAL, open_req->num_chans, 0.0, tx_paths, rx_paths);
+	uhd_wrap_dev->open("", cref, false);
+
+	return uhd_wrap_dev;
+}
+extern "C" int32_t uhdwrap_get_bufsizerx(void *dev)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	return d->bufsizerx();
+}
+
+extern "C" int32_t uhdwrap_get_timingoffset(void *dev)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	return d->getTimingOffset();
+}
+
+extern "C" int32_t uhdwrap_read(void *dev, uint32_t num_chans)
+{
+	TIMESTAMP t;
+	uhd_wrap *d = (uhd_wrap *)dev;
+
+	if (num_chans != d->wrap_rx_buf_ptrs.size()) {
+		perror("omg chans?!");
+	}
+
+	int32_t read = d->wrap_read(&t);
+
+	/* multi channel rx on b210 will return 0 due to alignment adventures, do not put 0 samples into a ipc buffer... */
+	if (read <= 0)
+		return read;
+
+	for (uint32_t i = 0; i < num_chans; i++) {
+		ipc_shm_enqueue(ios_rx_from_device[i], t, read, (uint16_t *)&d->wrap_rx_buffs[i].front());
+	}
+	return read;
+}
+
+extern "C" int32_t uhdwrap_write(void *dev, uint32_t num_chans, bool *underrun)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+
+	uint64_t timestamp;
+	int32_t len = -1;
+	for (uint32_t i = 0; i < num_chans; i++) {
+		len = ipc_shm_read(ios_tx_to_device[i], (uint16_t *)&d->wrap_tx_buffs[i].front(), 5000, &timestamp, 1);
+		if (len < 0)
+			return 0;
+	}
+
+	return d->writeSamples(d->wrap_tx_buf_ptrs, len, underrun, timestamp);
+}
+
+extern "C" double uhdwrap_set_freq(void *dev, double f, size_t chan, bool for_tx)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	if (for_tx)
+		return d->setTxFreq(f, chan);
+	else
+		return d->setRxFreq(f, chan);
+}
+
+extern "C" double uhdwrap_set_gain(void *dev, double f, size_t chan, bool for_tx)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	//	if (for_tx)
+	//		return d->setTxGain(f, chan);
+	//	else
+	return d->setRxGain(f, chan);
+}
+
+extern "C" double uhdwrap_set_txatt(void *dev, double a, size_t chan)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	return d->setPowerAttenuation(a, chan);
+}
+
+extern "C" int32_t uhdwrap_start(void *dev, int chan)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	return d->start();
+}
+
+extern "C" int32_t uhdwrap_stop(void *dev, int chan)
+{
+	uhd_wrap *d = (uhd_wrap *)dev;
+	return d->stop();
+}
+
+extern "C" void uhdwrap_fill_info_cnf(struct ipc_sk_if *ipc_prim)
+{
+	struct ipc_sk_if_info_chan *chan_info;
+
+	uhd::device_addr_t args("");
+	uhd::device_addrs_t devs_found = uhd::device::find(args);
+	if (devs_found.size() < 1) {
+		std::cout << "\n No device found!";
+		exit(0);
+	}
+
+	uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(devs_found[0]);
+	auto rxchans = usrp->get_rx_num_channels();
+	auto txchans = usrp->get_tx_num_channels();
+	auto rx_range = usrp->get_rx_gain_range();
+	auto tx_range = usrp->get_tx_gain_range();
+
+	//auto nboards = usrp->get_num_mboards();
+	auto refs = usrp->get_clock_sources(0);
+	auto devname = usrp->get_mboard_name(0);
+
+	ipc_prim->u.info_cnf.feature_mask = 0;
+	if (std::find(refs.begin(), refs.end(), "internal") != refs.end())
+		ipc_prim->u.info_cnf.feature_mask |= FEATURE_MASK_CLOCKREF_INTERNAL;
+	if (std::find(refs.begin(), refs.end(), "external") != refs.end())
+		ipc_prim->u.info_cnf.feature_mask |= FEATURE_MASK_CLOCKREF_EXTERNAL;
+
+	// at least one duplex channel
+	auto num_chans = rxchans == txchans ? txchans : 1;
+
+	ipc_prim->u.info_cnf.iq_scaling_val_rx = 0.3;
+	ipc_prim->u.info_cnf.iq_scaling_val_tx = 1;
+	ipc_prim->u.info_cnf.max_num_chans = num_chans;
+	OSMO_STRLCPY_ARRAY(ipc_prim->u.info_cnf.dev_desc, devname.c_str());
+	chan_info = ipc_prim->u.info_cnf.chan_info;
+	for (unsigned int i = 0; i < ipc_prim->u.info_cnf.max_num_chans; i++) {
+		auto rxant = usrp->get_rx_antennas(i);
+		auto txant = usrp->get_tx_antennas(i);
+		for (unsigned int j = 0; j < txant.size(); j++) {
+			OSMO_STRLCPY_ARRAY(chan_info->tx_path[j], txant[j].c_str());
+		}
+		for (unsigned int j = 0; j < rxant.size(); j++) {
+			OSMO_STRLCPY_ARRAY(chan_info->rx_path[j], rxant[j].c_str());
+		}
+		chan_info->min_rx_gain = rx_range.start();
+		chan_info->max_rx_gain = rx_range.stop();
+		chan_info->min_tx_gain = tx_range.start();
+		chan_info->max_tx_gain = tx_range.stop();
+		chan_info->nominal_tx_power = 7.5; // FIXME: would require uhd dev + freq info
+		chan_info++;
+	}
+}

Transceiver52M/device/ipc2/uhdwrap.h

@@ -0,0 +1,83 @@
+/*
+* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+* Author: Eric Wild <ewild@sysmocom.de>
+*
+* SPDX-License-Identifier: 0BSD
+*
+* Permission to use, copy, modify, and/or distribute this software for any purpose
+* with or without fee is hereby granted.THE SOFTWARE IS PROVIDED "AS IS" AND THE
+* AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+* BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
+* USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+#ifndef IPC_UHDWRAP_H
+#define IPC_UHDWRAP_H
+
+#ifdef __cplusplus
+#include "../uhd/UHDDevice.h"
+
+class uhd_wrap : public uhd_device {
+    public:
+	//	std::thread *t;
+	size_t samps_per_buff_rx;
+	size_t samps_per_buff_tx;
+	int channel_count;
+
+	std::vector<std::vector<short> > wrap_rx_buffs;
+	std::vector<std::vector<short> > wrap_tx_buffs;
+	std::vector<short *> wrap_rx_buf_ptrs;
+	std::vector<short *> wrap_tx_buf_ptrs;
+
+	template <typename... Args> uhd_wrap(Args... args) : uhd_device(args...)
+	{
+		//	t = new std::thread(magicthread);
+		// give the thread some time to start and set up
+		//	std::this_thread::sleep_for(std::chrono::seconds(1));
+	}
+	virtual ~uhd_wrap();
+
+	//    void ipc_sock_close() override {};
+	int wrap_read(TIMESTAMP *timestamp);
+	virtual int open(const std::string &args, int ref, bool swap_channels) override;
+
+	//	bool start() override;
+	//	bool stop() override;
+	//	virtual TIMESTAMP initialWriteTimestamp() override;
+	//	virtual TIMESTAMP initialReadTimestamp() override;
+
+	int getTimingOffset()
+	{
+		return ts_offset;
+	}
+	size_t bufsizerx();
+	size_t bufsizetx();
+	int chancount();
+};
+#else
+void *uhdwrap_open(struct ipc_sk_if_open_req *open_req);
+
+int32_t uhdwrap_get_bufsizerx(void *dev);
+
+int32_t uhdwrap_get_timingoffset(void *dev);
+
+int32_t uhdwrap_read(void *dev, uint32_t num_chans);
+
+int32_t uhdwrap_write(void *dev, uint32_t num_chans, bool *underrun);
+
+double uhdwrap_set_freq(void *dev, double f, size_t chan, bool for_tx);
+
+double uhdwrap_set_gain(void *dev, double f, size_t chan, bool for_tx);
+
+int32_t uhdwrap_start(void *dev, int chan);
+
+int32_t uhdwrap_stop(void *dev, int chan);
+
+void uhdwrap_fill_info_cnf(struct ipc_sk_if *ipc_prim);
+
+double uhdwrap_set_txatt(void *dev, double a, size_t chan);
+#endif
+
+#endif // IPC_B210_H

Transceiver52M/grgsm_vitac/constants.h

@@ -0,0 +1,121 @@
+#pragma once
+
+#include <complex>
+
+#define gr_complex std::complex<float>
+
+
+#define GSM_SYMBOL_RATE  (1625000.0/6.0) //symbols per second
+#define GSM_SYMBOL_PERIOD (1.0/GSM_SYMBOL_RATE) //seconds per symbol
+
+//Burst timing
+#define TAIL_BITS         3
+#define GUARD_BITS        8
+#define GUARD_FRACTIONAL  0.25 //fractional part of guard period
+#define GUARD_PERIOD      GUARD_BITS + GUARD_FRACTIONAL
+#define DATA_BITS         57   //size of 1 data block in normal burst
+#define STEALING_BIT      1
+#define N_TRAIN_BITS      26
+#define N_SYNC_BITS       64
+#define USEFUL_BITS       142  //(2*(DATA_BITS+STEALING_BIT) + N_TRAIN_BITS )
+#define FCCH_BITS         USEFUL_BITS
+#define BURST_SIZE        (USEFUL_BITS+2*TAIL_BITS)
+#define ACCESS_BURST_SIZE 88
+#define PROCESSED_CHUNK   BURST_SIZE+2*GUARD_PERIOD
+
+#define SCH_DATA_LEN      39
+#define TS_BITS           (TAIL_BITS+USEFUL_BITS+TAIL_BITS+GUARD_BITS)  //a full TS (156 bits)
+#define TS_PER_FRAME      8
+#define FRAME_BITS        (TS_PER_FRAME * TS_BITS + 2) // 156.25 * 8
+#define FCCH_POS          TAIL_BITS
+#define SYNC_POS          (TAIL_BITS + 39)
+#define TRAIN_POS         ( TAIL_BITS + (DATA_BITS+STEALING_BIT) + 5) //first 5 bits of a training sequence
+													   //aren't used for channel impulse response estimation
+#define TRAIN_BEGINNING   5
+#define SAFETY_MARGIN     6   //
+
+#define FCCH_HITS_NEEDED        (USEFUL_BITS - 4)
+#define FCCH_MAX_MISSES         1
+#define FCCH_MAX_FREQ_OFFSET    100
+
+#define CHAN_IMP_RESP_LENGTH  5
+
+#define MAX_SCH_ERRORS    10  //maximum number of subsequent sch errors after which gsm receiver goes to find_next_fcch state
+
+typedef enum { empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy, dummy_or_normal, normal_or_noise } burst_type;
+typedef enum { unknown, multiframe_26, multiframe_51 } multiframe_type;
+
+static const unsigned char SYNC_BITS[] = {
+  1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0,
+  0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
+  0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1,
+  0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1
+};
+
+const unsigned FCCH_FRAMES[] = { 0, 10, 20, 30, 40 };
+const unsigned SCH_FRAMES[] = { 1, 11, 21, 31, 41 };
+
+const unsigned BCCH_FRAMES[] = { 2, 3, 4, 5 };          //!!the receiver shouldn't care about logical
+													  //!!channels so this will be removed from this header
+const unsigned TEST_CCH_FRAMES[] = { 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 32, 33, 34, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 48, 49 };
+const unsigned TRAFFIC_CHANNEL_F[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 };
+const unsigned TEST51[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 };
+
+
+#define TSC0  0
+#define TSC1  1
+#define TSC2  2
+#define TSC3  3
+#define TSC4  4
+#define TSC5  5
+#define TSC6  6
+#define TSC7  7
+#define TS_DUMMY 8
+
+#define TRAIN_SEQ_NUM 9
+
+#define TIMESLOT0  0
+#define TIMESLOT1  1
+#define TIMESLOT2  2
+#define TIMESLOT3  3
+#define TIMESLOT4  4
+#define TIMESLOT5  5
+#define TIMESLOT6  6
+#define TIMESLOT7  7
+
+
+static const unsigned char train_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS] = {
+  {0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0},
+  {0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0},
+  {0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1},
+  {0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0},
+  {1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1},
+  {1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0},
+  {0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1} // DUMMY
+};
+
+
+//Dummy burst 0xFB 76 0A 4E 09 10 1F 1C 5C 5C 57 4A 33 39 E9 F1 2F A8
+static const unsigned char dummy_burst[] = {
+  0, 0, 0,
+  1, 1, 1, 1, 1, 0, 1, 1, 0, 1,
+  1, 1, 0, 1, 1, 0, 0, 0, 0, 0,
+  1, 0, 1, 0, 0, 1, 0, 0, 1, 1,
+  1, 0, 0, 0, 0, 0, 1, 0, 0, 1,
+  0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
+  0, 1, 1, 1, 1, 1, 0, 0,
+
+  0, 1, 1, 1, 0, 0, 0, 1, 0, 1,
+  1, 1, 0, 0, 0, 1, 0, 1, 1, 1,
+  0, 0, 0, 1, 0, 1,
+
+  0, 1, 1, 1, 0, 1, 0, 0, 1, 0,
+  1, 0, 0, 0, 1, 1, 0, 0, 1, 1,
+  0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
+  1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
+  0, 0, 0, 1, 0, 0, 1, 0, 1, 1,
+  1, 1, 1, 0, 1, 0, 1, 0,
+  0, 0, 0
+};

Transceiver52M/grgsm_vitac/grgsm_vitac.cpp

@@ -0,0 +1,338 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author (C) 2009-2017  by Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "constants.h"
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <complex>
+
+
+#include <algorithm>
+#include <string.h>
+#include <iostream>
+#include <numeric>
+#include <vector>
+#include <fstream>
+
+#include "viterbi_detector.h"
+#include "grgsm_vitac.h"
+
+//signalVector mChanResp;
+gr_complex d_sch_training_seq[N_SYNC_BITS]; ///<encoded training sequence of a SCH burst
+gr_complex d_norm_training_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS]; ///<encoded training sequences of a normal and dummy burst
+const int d_chan_imp_length = CHAN_IMP_RESP_LENGTH;
+
+void initvita() {
+
+	/**
+	 * Prepare SCH sequence bits
+	 *
+	 * (TS_BITS + 2 * GUARD_PERIOD)
+	 * Burst and two guard periods
+	 * (one guard period is an arbitrary overlap)
+	 */
+	gmsk_mapper(SYNC_BITS, N_SYNC_BITS,
+		d_sch_training_seq, gr_complex(0.0, -1.0));
+	for (auto &i : d_sch_training_seq)
+		i = conj(i);
+
+	/* Prepare bits of training sequences */
+	for (int i = 0; i < TRAIN_SEQ_NUM; i++) {
+		/**
+		 * If first bit of the sequence is 0
+		 * => first symbol is 1, else -1
+		 */
+		gr_complex startpoint = train_seq[i][0] == 0 ?
+			gr_complex(1.0, 0.0) : gr_complex(-1.0, 0.0);
+		gmsk_mapper(train_seq[i], N_TRAIN_BITS,
+			d_norm_training_seq[i], startpoint);
+		for (auto &i : d_norm_training_seq[i])
+			i = conj(i);
+	}
+
+}
+
+MULTI_VER_TARGET_ATTR
+void
+detect_burst(const gr_complex* input,
+	gr_complex* chan_imp_resp, int burst_start,
+	unsigned char* output_binary)
+{
+	std::vector<gr_complex> rhh_temp(CHAN_IMP_RESP_LENGTH * d_OSR);
+	unsigned int stop_states[2] = { 4, 12 };
+	gr_complex filtered_burst[BURST_SIZE];
+	gr_complex rhh[CHAN_IMP_RESP_LENGTH];
+	float output[BURST_SIZE];
+	int start_state = 3;
+
+	// if(burst_start < 0 ||burst_start > 10)
+	// 	fprintf(stderr, "bo %d\n", burst_start);
+
+	// burst_start = burst_start >= 0 ? burst_start : 0;
+
+	autocorrelation(chan_imp_resp, &rhh_temp[0], d_chan_imp_length * d_OSR);
+	for (int ii = 0; ii < d_chan_imp_length; ii++)
+		rhh[ii] = conj(rhh_temp[ii * d_OSR]);
+
+	mafi(&input[burst_start], BURST_SIZE, chan_imp_resp,
+		d_chan_imp_length * d_OSR, filtered_burst);
+
+	viterbi_detector(filtered_burst, BURST_SIZE, rhh,
+		start_state, stop_states, 2, output);
+
+	for (int i = 0; i < BURST_SIZE; i++)
+		output_binary[i] = output[i] > 0;
+}
+
+int process_vita_burst(gr_complex* input, int tsc, unsigned char* output_binary) {
+	gr_complex channel_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+	int normal_burst_start, dummy_burst_start;
+	float dummy_corr_max, normal_corr_max;
+
+	dummy_burst_start = get_norm_chan_imp_resp(input,
+		&channel_imp_resp[0], &dummy_corr_max, TS_DUMMY);
+	normal_burst_start = get_norm_chan_imp_resp(input,
+		&channel_imp_resp[0], &normal_corr_max, tsc);
+
+	if (normal_corr_max > dummy_corr_max) {
+		/* Perform MLSE detection */
+		detect_burst(input, &channel_imp_resp[0],
+			normal_burst_start, output_binary);
+		
+		return 0;
+
+	} else {
+		memcpy(output_binary, dummy_burst, 148);
+		//std::cerr << std::endl << "#NOPE#" << dd.fpath << std::endl << std::endl;
+		return -1;
+	}
+}
+
+int process_vita_sc_burst(gr_complex* input, int tsc, unsigned char* output_binary, int* offset) {
+	gr_complex channel_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+
+	/* Get channel impulse response */
+	int d_c0_burst_start = get_sch_chan_imp_resp(input, &channel_imp_resp[0]);
+	//	*offset = d_c0_burst_start;
+	/* Perform MLSE detection */
+	detect_burst(input, &channel_imp_resp[0],
+	d_c0_burst_start, output_binary);
+
+	return 0;
+}
+
+void
+gmsk_mapper(const unsigned char* input,
+	int nitems, gr_complex* gmsk_output, gr_complex start_point)
+{
+	gr_complex j = gr_complex(0.0, 1.0);
+	gmsk_output[0] = start_point;
+
+	int previous_symbol = 2 * input[0] - 1;
+	int current_symbol;
+	int encoded_symbol;
+
+	for (int i = 1; i < nitems; i++) {
+		/* Change bits representation to NRZ */
+		current_symbol = 2 * input[i] - 1;
+
+		/* Differentially encode */
+		encoded_symbol = current_symbol * previous_symbol;
+
+		/* And do GMSK mapping */
+		gmsk_output[i] = j * gr_complex(encoded_symbol, 0.0)
+			* gmsk_output[i - 1];
+
+		previous_symbol = current_symbol;
+	}
+}
+
+gr_complex
+correlate_sequence(const gr_complex* sequence,
+	int length, const gr_complex* input)
+{
+	gr_complex result(0.0, 0.0);
+
+	for (int ii = 0; ii < length; ii++)
+		result += sequence[ii] * input[ii * d_OSR];
+
+	return conj(result) / gr_complex(length, 0);
+}
+
+/* Computes autocorrelation for positive arguments */
+inline void
+autocorrelation(const gr_complex* input,
+	gr_complex* out, int nitems)
+{
+	for (int k = nitems - 1; k >= 0; k--) {
+		out[k] = gr_complex(0, 0);
+		for (int i = k; i < nitems; i++)
+			out[k] += input[i] * conj(input[i - k]);
+	}
+}
+
+inline void
+mafi(const gr_complex* input, int nitems,
+	gr_complex* filter, int filter_length, gr_complex* output)
+{
+	for (int n = 0; n < nitems; n++) {
+		int a = n * d_OSR;
+		output[n] = 0;
+
+		for (int ii = 0; ii < filter_length; ii++) {
+			if ((a + ii) >= nitems * d_OSR)
+				break;
+
+			output[n] += input[a + ii] * filter[ii];
+		}
+	}
+}
+
+int get_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp, int search_center, int search_start_pos,
+		      int search_stop_pos, gr_complex *tseq, int tseqlen, float *corr_max)
+{
+	std::vector<gr_complex> correlation_buffer;
+	std::vector<float> window_energy_buffer;
+	std::vector<float> power_buffer;
+
+	for (int ii = search_start_pos; ii < search_stop_pos; ii++) {
+		gr_complex correlation = correlate_sequence(tseq, tseqlen, &input[ii]);
+		correlation_buffer.push_back(correlation);
+		power_buffer.push_back(std::pow(abs(correlation), 2));
+	}
+
+	int strongest_corr_nr = max_element(power_buffer.begin(), power_buffer.end()) - power_buffer.begin();
+
+	/* Compute window energies */
+	auto window_energy_start_offset = strongest_corr_nr - 6 * d_OSR;
+	window_energy_start_offset = window_energy_start_offset < 0 ? 0 : window_energy_start_offset; //can end up out of range..
+	auto window_energy_end_offset = strongest_corr_nr + 6 * d_OSR + d_chan_imp_length * d_OSR;
+	auto iter = power_buffer.begin() + window_energy_start_offset;
+	auto iter_end = power_buffer.begin() + window_energy_end_offset;
+	while (iter != iter_end) {
+		std::vector<float>::iterator iter_ii = iter;
+		bool loop_end = false;
+		float energy = 0;
+
+		int len = d_chan_imp_length * d_OSR;
+		for (int ii = 0; ii < len; ii++, iter_ii++) {
+			if (iter_ii == power_buffer.end()) {
+				loop_end = true;
+				break;
+			}
+
+			energy += (*iter_ii);
+		}
+
+		if (loop_end)
+			break;
+
+		window_energy_buffer.push_back(energy);
+		iter++;
+	}
+
+	/* Calculate the strongest window number */
+	int strongest_window_nr = window_energy_start_offset +
+				  max_element(window_energy_buffer.begin(), window_energy_buffer.end()) -
+				  window_energy_buffer.begin();
+
+	// auto window_search_start = window_energy_buffer.begin() + strongest_corr_nr - 5* d_OSR;
+	// auto window_search_end = window_energy_buffer.begin() + strongest_corr_nr + 10* d_OSR;
+	// window_search_end = window_search_end >= window_energy_buffer.end() ? window_energy_buffer.end() : window_search_end;
+
+	// /* Calculate the strongest window number */
+	// int strongest_window_nr = max_element(window_search_start, window_search_end /* - d_chan_imp_length * d_OSR*/) - window_energy_buffer.begin();
+
+	// if (strongest_window_nr < 0)
+	// 	strongest_window_nr = 0;
+
+	float max_correlation = 0;
+	for (int ii = 0; ii < d_chan_imp_length * d_OSR; ii++) {
+		gr_complex correlation = correlation_buffer[strongest_window_nr + ii];
+		if (abs(correlation) > max_correlation)
+			max_correlation = abs(correlation);
+		chan_imp_resp[ii] = correlation;
+	}
+
+	*corr_max = max_correlation;
+
+	/**
+	 * Compute first sample position, which corresponds
+	 * to the first sample of the impulse response
+	 */
+	return search_start_pos + strongest_window_nr - search_center * d_OSR;
+}
+
+/*
+
+3 + 57 + 1 + 26 + 1 + 57 + 3 + 8.25
+
+search center = 3 + 57 + 1 + 5 (due to tsc 5+16+5 split)
+this is +-5 samples around (+5 beginning) of truncated t16 tsc
+
+*/
+int get_norm_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp, float *corr_max, int bcc)
+{
+	const int search_center = TRAIN_POS;
+	const int search_start_pos = (search_center - 5) * d_OSR + 1;
+	const int search_stop_pos = (search_center + 5 + d_chan_imp_length) * d_OSR;
+	const auto tseq = &d_norm_training_seq[bcc][TRAIN_BEGINNING];
+	const auto tseqlen = N_TRAIN_BITS - (2 * TRAIN_BEGINNING);
+	return get_chan_imp_resp(input, chan_imp_resp, search_center, search_start_pos, search_stop_pos, tseq, tseqlen,
+				 corr_max);
+}
+
+/*
+
+3 tail | 39 data | 64 tsc | 39 data | 3 tail | 8.25 guard
+start 3+39 - 10
+end 3+39 + SYNC_SEARCH_RANGE
+
+*/
+int get_sch_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp)
+{
+	const int search_center = SYNC_POS + TRAIN_BEGINNING;
+	const int search_start_pos = (search_center - 10) * d_OSR;
+	const int search_stop_pos = (search_center + SYNC_SEARCH_RANGE) * d_OSR;
+	const auto tseq = &d_sch_training_seq[TRAIN_BEGINNING];
+	const auto tseqlen = N_SYNC_BITS - (2 * TRAIN_BEGINNING);
+
+	// strongest_window_nr + chan_imp_resp_center + SYNC_POS *d_OSR - 48 * d_OSR - 2 * d_OSR + 2 ;
+	float corr_max;
+	return get_chan_imp_resp(input, chan_imp_resp, search_center, search_start_pos, search_stop_pos, tseq, tseqlen,
+				 &corr_max);
+}
+
+int get_sch_buffer_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp, unsigned int len, float *corr_max)
+{
+	const auto tseqlen = N_SYNC_BITS - (2 * TRAIN_BEGINNING);
+	const int search_center = SYNC_POS + TRAIN_BEGINNING;
+	const int search_start_pos = 0;
+	// FIXME: proper end offset
+	const int search_stop_pos = len - (N_SYNC_BITS*8);
+	auto tseq = &d_sch_training_seq[TRAIN_BEGINNING];
+
+	return get_chan_imp_resp(input, chan_imp_resp, search_center, search_start_pos, search_stop_pos, tseq, tseqlen,
+				 corr_max);
+}

Transceiver52M/grgsm_vitac/grgsm_vitac.h

@@ -0,0 +1,42 @@
+
+#pragma once
+
+#include <vector>
+#include "constants.h"
+
+#if defined(__has_attribute)
+#if __has_attribute(target_clones) && defined(__x86_64) && false
+#define MULTI_VER_TARGET_ATTR __attribute__((target_clones("avx", "sse4.2", "sse3", "sse2", "sse", "default")))
+#else
+#define MULTI_VER_TARGET_ATTR
+#endif
+#endif
+
+#define SYNC_SEARCH_RANGE 30
+const int d_OSR(4);
+
+void initvita();
+
+int process_vita_burst(gr_complex *input, int tsc, unsigned char *output_binary);
+int process_vita_sc_burst(gr_complex *input, int tsc, unsigned char *output_binary, int *offset);
+
+MULTI_VER_TARGET_ATTR
+void detect_burst(const gr_complex *input, gr_complex *chan_imp_resp, int burst_start, unsigned char *output_binary);
+void gmsk_mapper(const unsigned char *input, int nitems, gr_complex *gmsk_output, gr_complex start_point);
+gr_complex correlate_sequence(const gr_complex *sequence, int length, const gr_complex *input);
+inline void autocorrelation(const gr_complex *input, gr_complex *out, int nitems);
+inline void mafi(const gr_complex *input, int nitems, gr_complex *filter, int filter_length, gr_complex *output);
+int get_sch_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp);
+int get_norm_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp, float *corr_max, int bcc);
+int get_sch_buffer_chan_imp_resp(const gr_complex *input, gr_complex *chan_imp_resp, unsigned int len, float *corr_max);
+
+enum class btype { NB, SCH };
+struct fdata {
+	btype t;
+	unsigned int fn;
+	int tn;
+	int bcc;
+	std::string fpath;
+	std::vector<gr_complex> data;
+	unsigned int data_start_offset;
+};

Transceiver52M/grgsm_vitac/viterbi_detector.cc

@@ -0,0 +1,392 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author (C) 2009 by Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * viterbi_detector:
+ *           This part does the detection of received sequnece.
+ *           Employed algorithm is viterbi Maximum Likehood Sequence Estimation.
+ *           At this moment it gives hard decisions on the output, but
+ *           it was designed with soft decisions in mind.
+ *
+ * SYNTAX:   void viterbi_detector(
+ *                                  const gr_complex * input, 
+ *                                  unsigned int samples_num, 
+ *                                  gr_complex * rhh, 
+ *                                  unsigned int start_state, 
+ *                                  const unsigned int * stop_states, 
+ *                                  unsigned int stops_num, 
+ *                                  float * output)
+ *
+ * INPUT:    input:       Complex received signal afted matched filtering.
+ *           samples_num: Number of samples in the input table.
+ *           rhh:         The autocorrelation of the estimated channel 
+ *                        impulse response.
+ *           start_state: Number of the start point. In GSM each burst 
+ *                        starts with sequence of three bits (0,0,0) which 
+ *                        indicates start point of the algorithm.
+ *           stop_states: Table with numbers of possible stop states.
+ *           stops_num:   Number of possible stop states
+ *                     
+ *
+ * OUTPUT:   output:      Differentially decoded hard output of the algorithm: 
+ *                        -1 for logical "0" and 1 for logical "1"
+ *
+ * SUB_FUNC: none
+ *
+ * TEST(S):  Tested with real world normal burst.
+ */
+
+#include "constants.h"
+#include <cmath>
+
+#define PATHS_NUM (1 << (CHAN_IMP_RESP_LENGTH-1))
+
+void viterbi_detector(const gr_complex * input, unsigned int samples_num, gr_complex * rhh, unsigned int start_state, const unsigned int * stop_states, unsigned int stops_num, float * output)
+{
+   float increment[8];
+   float path_metrics1[16];
+   float path_metrics2[16];
+   float paths_difference;
+   float * new_path_metrics;
+   float * old_path_metrics;
+   float * tmp;
+   float trans_table[BURST_SIZE][16];
+   float pm_candidate1, pm_candidate2;
+   bool real_imag;
+   float input_symbol_real, input_symbol_imag;
+   unsigned int i, sample_nr;
+
+/*
+* Setup first path metrics, so only state pointed by start_state is possible.
+* Start_state metric is equal to zero, the rest is written with some very low value,
+* which makes them practically impossible to occur.
+*/
+   for(i=0; i<PATHS_NUM; i++){
+      path_metrics1[i]=(-10e30);
+   }
+   path_metrics1[start_state]=0;
+
+/*
+* Compute Increment - a table of values which does not change for subsequent input samples.
+* Increment is table of reference levels for computation of branch metrics:
+*    branch metric = (+/-)received_sample (+/-) reference_level
+*/
+   increment[0] = -rhh[1].imag() -rhh[2].real() -rhh[3].imag() +rhh[4].real();
+   increment[1] = rhh[1].imag() -rhh[2].real() -rhh[3].imag() +rhh[4].real();
+   increment[2] = -rhh[1].imag() +rhh[2].real() -rhh[3].imag() +rhh[4].real();
+   increment[3] = rhh[1].imag() +rhh[2].real() -rhh[3].imag() +rhh[4].real();
+   increment[4] = -rhh[1].imag() -rhh[2].real() +rhh[3].imag() +rhh[4].real();
+   increment[5] = rhh[1].imag() -rhh[2].real() +rhh[3].imag() +rhh[4].real();
+   increment[6] = -rhh[1].imag() +rhh[2].real() +rhh[3].imag() +rhh[4].real();
+   increment[7] = rhh[1].imag() +rhh[2].real() +rhh[3].imag() +rhh[4].real();
+
+
+/*
+* Computation of path metrics and decisions (Add-Compare-Select).
+* It's composed of two parts: one for odd input samples (imaginary numbers)
+* and one for even samples (real numbers).
+* Each part is composed of independent (parallelisable) statements like  
+* this one:
+*      pm_candidate1 = old_path_metrics[0] -input_symbol_imag +increment[2];
+*      pm_candidate2 = old_path_metrics[8] -input_symbol_imag -increment[5];
+*      paths_difference=pm_candidate2-pm_candidate1;
+*      new_path_metrics[1]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+*      trans_table[sample_nr][1] = paths_difference;
+* This is very good point for optimisations (SIMD or OpenMP) as it's most time 
+* consuming part of this function. 
+*/
+   sample_nr=0;
+   old_path_metrics=path_metrics1;
+   new_path_metrics=path_metrics2;
+   while(sample_nr<samples_num){
+      //Processing imag states
+      real_imag=1;
+      input_symbol_imag = input[sample_nr].imag();
+
+      pm_candidate1 = old_path_metrics[0] +input_symbol_imag -increment[2];
+      pm_candidate2 = old_path_metrics[8] +input_symbol_imag +increment[5];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[0]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][0] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[0] -input_symbol_imag +increment[2];
+      pm_candidate2 = old_path_metrics[8] -input_symbol_imag -increment[5];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[1]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][1] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[1] +input_symbol_imag -increment[3];
+      pm_candidate2 = old_path_metrics[9] +input_symbol_imag +increment[4];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[2]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][2] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[1] -input_symbol_imag +increment[3];
+      pm_candidate2 = old_path_metrics[9] -input_symbol_imag -increment[4];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[3]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][3] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[2] +input_symbol_imag -increment[0];
+      pm_candidate2 = old_path_metrics[10] +input_symbol_imag +increment[7];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[4]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][4] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[2] -input_symbol_imag +increment[0];
+      pm_candidate2 = old_path_metrics[10] -input_symbol_imag -increment[7];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[5]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][5] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[3] +input_symbol_imag -increment[1];
+      pm_candidate2 = old_path_metrics[11] +input_symbol_imag +increment[6];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[6]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][6] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[3] -input_symbol_imag +increment[1];
+      pm_candidate2 = old_path_metrics[11] -input_symbol_imag -increment[6];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[7]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][7] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[4] +input_symbol_imag -increment[6];
+      pm_candidate2 = old_path_metrics[12] +input_symbol_imag +increment[1];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[8]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][8] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[4] -input_symbol_imag +increment[6];
+      pm_candidate2 = old_path_metrics[12] -input_symbol_imag -increment[1];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[9]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][9] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[5] +input_symbol_imag -increment[7];
+      pm_candidate2 = old_path_metrics[13] +input_symbol_imag +increment[0];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[10]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][10] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[5] -input_symbol_imag +increment[7];
+      pm_candidate2 = old_path_metrics[13] -input_symbol_imag -increment[0];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[11]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][11] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[6] +input_symbol_imag -increment[4];
+      pm_candidate2 = old_path_metrics[14] +input_symbol_imag +increment[3];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[12]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][12] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[6] -input_symbol_imag +increment[4];
+      pm_candidate2 = old_path_metrics[14] -input_symbol_imag -increment[3];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[13]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][13] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[7] +input_symbol_imag -increment[5];
+      pm_candidate2 = old_path_metrics[15] +input_symbol_imag +increment[2];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[14]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][14] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[7] -input_symbol_imag +increment[5];
+      pm_candidate2 = old_path_metrics[15] -input_symbol_imag -increment[2];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[15]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][15] = paths_difference;
+      tmp=old_path_metrics;
+      old_path_metrics=new_path_metrics;
+      new_path_metrics=tmp;
+
+      sample_nr++;
+      if(sample_nr==samples_num)
+         break;
+
+      //Processing real states
+      real_imag=0;
+      input_symbol_real = input[sample_nr].real();
+
+      pm_candidate1 = old_path_metrics[0] -input_symbol_real -increment[7];
+      pm_candidate2 = old_path_metrics[8] -input_symbol_real +increment[0];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[0]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][0] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[0] +input_symbol_real +increment[7];
+      pm_candidate2 = old_path_metrics[8] +input_symbol_real -increment[0];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[1]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][1] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[1] -input_symbol_real -increment[6];
+      pm_candidate2 = old_path_metrics[9] -input_symbol_real +increment[1];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[2]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][2] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[1] +input_symbol_real +increment[6];
+      pm_candidate2 = old_path_metrics[9] +input_symbol_real -increment[1];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[3]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][3] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[2] -input_symbol_real -increment[5];
+      pm_candidate2 = old_path_metrics[10] -input_symbol_real +increment[2];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[4]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][4] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[2] +input_symbol_real +increment[5];
+      pm_candidate2 = old_path_metrics[10] +input_symbol_real -increment[2];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[5]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][5] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[3] -input_symbol_real -increment[4];
+      pm_candidate2 = old_path_metrics[11] -input_symbol_real +increment[3];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[6]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][6] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[3] +input_symbol_real +increment[4];
+      pm_candidate2 = old_path_metrics[11] +input_symbol_real -increment[3];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[7]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][7] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[4] -input_symbol_real -increment[3];
+      pm_candidate2 = old_path_metrics[12] -input_symbol_real +increment[4];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[8]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][8] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[4] +input_symbol_real +increment[3];
+      pm_candidate2 = old_path_metrics[12] +input_symbol_real -increment[4];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[9]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][9] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[5] -input_symbol_real -increment[2];
+      pm_candidate2 = old_path_metrics[13] -input_symbol_real +increment[5];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[10]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][10] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[5] +input_symbol_real +increment[2];
+      pm_candidate2 = old_path_metrics[13] +input_symbol_real -increment[5];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[11]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][11] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[6] -input_symbol_real -increment[1];
+      pm_candidate2 = old_path_metrics[14] -input_symbol_real +increment[6];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[12]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][12] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[6] +input_symbol_real +increment[1];
+      pm_candidate2 = old_path_metrics[14] +input_symbol_real -increment[6];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[13]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][13] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[7] -input_symbol_real -increment[0];
+      pm_candidate2 = old_path_metrics[15] -input_symbol_real +increment[7];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[14]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][14] = paths_difference;
+
+      pm_candidate1 = old_path_metrics[7] +input_symbol_real +increment[0];
+      pm_candidate2 = old_path_metrics[15] +input_symbol_real -increment[7];
+      paths_difference=pm_candidate2-pm_candidate1;
+      new_path_metrics[15]=(paths_difference<0) ? pm_candidate1 : pm_candidate2;
+      trans_table[sample_nr][15] = paths_difference;
+
+      tmp=old_path_metrics;
+      old_path_metrics=new_path_metrics;
+      new_path_metrics=tmp;
+
+      sample_nr++;
+   }
+
+/*
+* Find the best from the stop states by comparing their path metrics.
+* Not every stop state is always possible, so we are searching in
+* a subset of them.
+*/
+   unsigned int best_stop_state;
+   float stop_state_metric, max_stop_state_metric;
+   best_stop_state = stop_states[0];
+   max_stop_state_metric = old_path_metrics[best_stop_state];
+   for(i=1; i< stops_num; i++){
+      stop_state_metric = old_path_metrics[stop_states[i]];
+      if(stop_state_metric > max_stop_state_metric){
+         max_stop_state_metric = stop_state_metric;
+         best_stop_state = stop_states[i];
+      }
+   }
+
+/*
+* This table was generated with hope that it gives a litle speedup during
+* traceback stage. 
+* Received bit is related to the number of state in the trellis.
+* I've numbered states so their parity (number of ones) is related
+* to a received bit. 
+*/
+   static const unsigned int parity_table[PATHS_NUM] = { 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0,  };
+
+/*
+* Table of previous states in the trellis diagram.
+* For GMSK modulation every state has two previous states.
+* Example:
+*   previous_state_nr1 = prev_table[current_state_nr][0]
+*   previous_state_nr2 = prev_table[current_state_nr][1]
+*/
+   static const unsigned int prev_table[PATHS_NUM][2] = { {0,8}, {0,8}, {1,9}, {1,9}, {2,10}, {2,10}, {3,11}, {3,11}, {4,12}, {4,12}, {5,13}, {5,13}, {6,14}, {6,14}, {7,15}, {7,15},  };
+
+/*
+* Traceback and differential decoding of received sequence.
+* Decisions stored in trans_table are used to restore best path in the trellis.
+*/
+   sample_nr=samples_num;
+   unsigned int state_nr=best_stop_state;
+   unsigned int decision;
+   bool out_bit=0;
+
+   while(sample_nr>0){
+      sample_nr--;
+      decision = (trans_table[sample_nr][state_nr]>0);
+
+      if(decision != out_bit)
+         output[sample_nr]=-trans_table[sample_nr][state_nr];
+      else
+         output[sample_nr]=trans_table[sample_nr][state_nr];
+
+      out_bit = out_bit ^ real_imag ^ parity_table[state_nr];
+      state_nr = prev_table[state_nr][decision];
+      real_imag = !real_imag;
+   }
+}

Transceiver52M/grgsm_vitac/viterbi_detector.h

@@ -0,0 +1,64 @@
+/* -*- c++ -*- */
+/*
+ * @file
+ * @author (C) 2009 Piotr Krysik <ptrkrysik@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * viterbi_detector:
+ *           This part does the detection of received sequnece.
+ *           Employed algorithm is viterbi Maximum Likehood Sequence Estimation.
+ *           At this moment it gives hard decisions on the output, but
+ *           it was designed with soft decisions in mind.
+ *
+ * SYNTAX:   void viterbi_detector(
+ *                                  const gr_complex * input, 
+ *                                  unsigned int samples_num, 
+ *                                  gr_complex * rhh, 
+ *                                  unsigned int start_state, 
+ *                                  const unsigned int * stop_states, 
+ *                                  unsigned int stops_num, 
+ *                                  float * output)
+ *
+ * INPUT:    input:       Complex received signal afted matched filtering.
+ *           samples_num: Number of samples in the input table.
+ *           rhh:         The autocorrelation of the estimated channel 
+ *                        impulse response.
+ *           start_state: Number of the start point. In GSM each burst 
+ *                        starts with sequence of three bits (0,0,0) which 
+ *                        indicates start point of the algorithm.
+ *           stop_states: Table with numbers of possible stop states.
+ *           stops_num:   Number of possible stop states
+ *                     
+ *
+ * OUTPUT:   output:      Differentially decoded hard output of the algorithm: 
+ *                        -1 for logical "0" and 1 for logical "1"
+ *
+ * SUB_FUNC: none
+ *
+ * TEST(S):  Tested with real world normal burst.
+ */
+
+#ifndef INCLUDED_VITERBI_DETECTOR_H
+#define INCLUDED_VITERBI_DETECTOR_H
+#include "constants.h"
+
+void viterbi_detector(const gr_complex * input, unsigned int samples_num, gr_complex * rhh, unsigned int start_state, const unsigned int * stop_states, unsigned int stops_num, float * output);
+
+#endif /* INCLUDED_VITERBI_DETECTOR_H */

Transceiver52M/itrq.h

@@ -0,0 +1,204 @@
+#pragma once
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <atomic>
+
+#include <condition_variable>
+#include <mutex>
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+#include <stdatomic.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+/*
+classic lamport circular lockfree spsc queue:
+every "side" only writes its own ptr, but may read the other sides ptr
+
+notify reader using eventfd as soon as element is added, reader then reads until
+read fails
+-> reader pops in a loop until FALSE and might get spurious events because it
+read before it was notified, which is fine
+-> writing pushes *the same data* in a loop until TRUE, blocks
+
+shutting this down requires
+1) to stop reading and pushing
+2) ONE side to take care of the eventfds
+*/
+
+namespace spsc_detail
+{
+template <bool block_read, bool block_write> class spsc_cond_detail {
+	std::condition_variable cond_r, cond_w;
+	std::mutex l;
+
+    public:
+	explicit spsc_cond_detail()
+	{
+	}
+
+	~spsc_cond_detail()
+	{
+	}
+
+	ssize_t spsc_check_r()
+	{
+		std::unique_lock<std::mutex> lk(l);
+		cond_r.wait(lk);
+		return 1;
+	}
+	ssize_t spsc_check_w()
+	{
+		std::unique_lock<std::mutex> lk(l);
+		cond_w.wait(lk);
+		return 1;
+	}
+	void spsc_notify_r()
+	{
+		cond_r.notify_one();
+	}
+	void spsc_notify_w()
+	{
+		cond_w.notify_one();
+	}
+};
+
+// originally designed for select loop integration
+template <bool block_read, bool block_write> class spsc_efd_detail {
+	int efd_r, efd_w; /* eventfds used to block/notify readers/writers */
+
+    public:
+	explicit spsc_efd_detail()
+		: efd_r(eventfd(0, block_read ? 0 : EFD_NONBLOCK)), efd_w(eventfd(1, block_write ? 0 : EFD_NONBLOCK))
+	{
+	}
+
+	~spsc_efd_detail()
+	{
+		close(efd_r);
+		close(efd_w);
+	}
+
+	ssize_t spsc_check_r()
+	{
+		uint64_t efdr;
+		return read(efd_r, &efdr, sizeof(uint64_t));
+	}
+	ssize_t spsc_check_w()
+	{
+		uint64_t efdr;
+		return read(efd_w, &efdr, sizeof(uint64_t));
+	}
+	void spsc_notify_r()
+	{
+		uint64_t efdu = 1;
+		write(efd_r, &efdu, sizeof(uint64_t));
+	}
+	void spsc_notify_w()
+	{
+		uint64_t efdu = 1;
+		write(efd_w, &efdu, sizeof(uint64_t));
+	}
+	int get_r_efd()
+	{
+		return efd_r;
+	}
+	int get_w_efd()
+	{
+		return efd_w;
+	}
+};
+
+template <unsigned int SZ, typename ELEM, bool block_read, bool block_write, template <bool, bool> class T>
+class spsc : public T<block_read, block_write> {
+	static_assert(SZ > 0, "queues need a size...");
+	std::atomic<unsigned int> readptr;
+	std::atomic<unsigned int> writeptr;
+
+	ELEM buf[SZ];
+
+    public:
+	using base_t = T<block_read, block_write>;
+	using elem_t = ELEM;
+	explicit spsc() : readptr(0), writeptr(0)
+	{
+	}
+
+	~spsc()
+	{
+	}
+
+	/*! Adds element to the queue by copying the data.
+ *  \param[in] elem input buffer, must match the originally configured queue buffer size!.
+ *  \returns true if queue was not full and element was successfully pushed */
+	bool spsc_push(ELEM *elem)
+	{
+		size_t cur_wp, cur_rp;
+		cur_wp = writeptr.load(std::memory_order_relaxed);
+		cur_rp = readptr.load(std::memory_order_acquire);
+		if ((cur_wp + 1) % SZ == cur_rp) {
+			if (block_write)
+				base_t::spsc_check_w(); /* blocks, ensures next (!) call succeeds */
+			return false;
+		}
+		buf[cur_wp] = *elem;
+		writeptr.store((cur_wp + 1) % SZ, std::memory_order_release);
+		if (block_read)
+			base_t::spsc_notify_r(); /* fine after release */
+		return true;
+	}
+
+	/*! Removes element from the queue by copying the data.
+ *  \param[in] elem output buffer, must match the originally configured queue buffer size!.
+ *  \returns true if queue was not empty and element was successfully removed */
+	bool spsc_pop(ELEM *elem)
+	{
+		size_t cur_wp, cur_rp;
+		cur_wp = writeptr.load(std::memory_order_acquire);
+		cur_rp = readptr.load(std::memory_order_relaxed);
+
+		if (cur_wp == cur_rp) /* blocks via prep_pop */
+			return false;
+
+		*elem = buf[cur_rp];
+		readptr.store((cur_rp + 1) % SZ, std::memory_order_release);
+		if (block_write)
+			base_t::spsc_notify_w();
+		return true;
+	}
+
+	/*! Reads the read-fd of the queue, which, depending on settings passed on queue creation, blocks.
+    * This function can be used to deliberately wait for a non-empty queue on the read side.
+    *  \returns result of reading the fd. */
+	ssize_t spsc_prep_pop()
+	{
+		return base_t::spsc_check_r();
+	}
+};
+
+} // namespace spsc_detail
+
+template <unsigned int SZ, typename ELEM, bool block_read, bool block_write>
+class spsc_evfd : public spsc_detail::spsc<SZ, ELEM, block_read, block_write, spsc_detail::spsc_efd_detail> {};
+template <unsigned int SZ, typename ELEM, bool block_read, bool block_write>
+class spsc_cond : public spsc_detail::spsc<SZ, ELEM, block_read, block_write, spsc_detail::spsc_cond_detail> {};

Transceiver52M/l1if.cpp

@@ -0,0 +1,124 @@
+#include <mutex>
+#include <queue>
+#include <deque>
+#include <condition_variable>
+#include <iostream>
+
+extern "C" {
+
+#include <unistd.h>
+#include <sys/eventfd.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/select.h>
+}
+#include "l1if.h"
+
+using namespace std;
+using namespace std::chrono_literals;
+
+template<typename Data>
+class spsc_q{
+
+    std::queue<Data> m_q;
+    std::mutex m_mtx;
+    std::condition_variable m_cond;
+    bool killme;
+
+public:
+    spsc_q() : killme{ false } { }
+
+    void push(Data i){
+        std::unique_lock<std::mutex> lock(m_mtx);
+        m_q.push(i);
+        m_cond.notify_one();
+    }
+
+    Data pop(){
+        std::unique_lock<std::mutex> lock(m_mtx);
+        m_cond.wait_for(lock, 100ms, [&](){ return !m_q.empty() || killme; });
+
+        if (killme || m_q.empty()){
+                return {};
+            }
+
+        Data x = m_q.front();
+        m_q.pop();
+
+        return x;
+    }
+
+    void stop(){
+        killme = true;
+        m_cond.notify_all();
+    }
+
+    auto sz() { return m_q.size(); }
+};
+
+
+/*
+ * trxif_from_trx_c <-> push_c
+ * trxif_to_trx_c <-> pop_c
+ * trxif_from_trx_d <-> push_d
+ * trxif_to_trx_d <-> pop_d
+ * ...
+ *
+ *
+ */
+class trxl1if {
+public:
+    spsc_q<TRX_C*> c_to_trx;
+    spsc_q<TRX_C*> c_from_trx;
+
+    spsc_q<trxd_to_trx*> d_to_trx;
+    spsc_q<trxd_from_trx*> d_from_trx;
+
+    struct osmo_fd g_event_ofd_C;
+    struct osmo_fd g_event_ofd_D;
+};
+
+trxl1if trxif;
+
+void push_c(TRX_C* i) {
+	uint64_t one = 1;
+	int rc;
+	trxif.c_from_trx.push(i);
+	// std::clog << trxif.c_from_trx.sz() << std::endl;
+	rc = ::write(trxif.g_event_ofd_C.fd, &one, sizeof(one));
+	return;
+};
+TRX_C* pop_c() {
+	return trxif.c_to_trx.pop();
+};
+void push_d(trxd_from_trx* i) {
+	uint64_t one = 1;
+	int rc;
+	trxif.d_from_trx.push(i);
+	rc = ::write(trxif.g_event_ofd_D.fd, &one, sizeof(one));
+	return;
+};
+trxd_to_trx* pop_d() {
+	return trxif.d_to_trx.pop();
+};
+
+extern "C" {
+char* trxif_from_trx_c() {
+    uint64_t one = 1;
+    ::read(trxif.g_event_ofd_C.fd, &one, sizeof(one));
+    return (char*)trxif.c_from_trx.pop();
+}
+void trxif_to_trx_c(char* msg) {
+    trxif.c_to_trx.push((TRX_C*)msg);
+}
+trxd_from_trx* trxif_from_trx_d() {
+    uint64_t one = 1;
+    ::read(trxif.g_event_ofd_D.fd, &one, sizeof(one));
+    return trxif.d_from_trx.pop();
+}
+void trxif_to_trx_d(trxd_to_trx* msg) {
+    trxif.d_to_trx.push(msg);
+}
+struct osmo_fd* get_c_fd() { return &trxif.g_event_ofd_C;}
+struct osmo_fd* get_d_fd() { return &trxif.g_event_ofd_D;}
+}

Transceiver52M/l1if.h

@@ -0,0 +1,74 @@
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <stdint.h>
+#ifdef __cplusplus
+}
+#endif
+
+/* ------------------------------------------------------------------------ */
+/* Data interface handlers                                                  */
+/* ------------------------------------------------------------------------ */
+/* DATA interface                                                           */
+/*                                                                          */
+/* Messages on the data interface carry one radio burst per UDP message.    */
+/*                                                                          */
+/* Received Data Burst:                                                     */
+/* 1 byte timeslot index                                                    */
+/* 4 bytes GSM frame number, BE                                             */
+/* 1 byte RSSI in -dBm                                                      */
+/* 2 bytes correlator timing offset in 1/256 symbol steps, 2's-comp, BE     */
+/* 148 bytes soft symbol estimates, 0 -> definite "0", 255 -> definite "1"  */
+/* 2 bytes are not used, but being sent by OsmoTRX                          */
+/*                                                                          */
+/* Transmit Data Burst:                                                     */
+/* 1 byte timeslot index                                                    */
+/* 4 bytes GSM frame number, BE                                             */
+/* 1 byte transmit level wrt ARFCN max, -dB (attenuation)                   */
+/* 148 bytes output symbol values, 0 & 1                                    */
+/* ------------------------------------------------------------------------ */
+
+struct __attribute__((packed)) trxd_to_trx {
+	uint8_t ts;
+	uint32_t fn;
+	uint8_t txlev;
+	uint8_t symbols[148];
+};
+
+struct __attribute__((packed)) trxd_from_trx {
+	uint8_t ts;
+	uint32_t fn;
+	uint8_t rssi;
+	uint16_t toa;
+	uint8_t symbols[148];
+	uint8_t pad[2];
+};
+
+#define TRXC_BUF_SIZE	1024
+
+struct TRX_C {
+    char cmd[TRXC_BUF_SIZE];
+};
+
+#ifdef __cplusplus
+void push_c(TRX_C* i);
+TRX_C* pop_c();
+
+void push_d(trxd_from_trx* i);
+trxd_to_trx* pop_d();
+
+#else
+
+
+char* trxif_from_trx_c();
+void trxif_to_trx_c(char* msg);
+
+struct trxd_from_trx* trxif_from_trx_d();
+void trxif_to_trx_d(struct trxd_to_trx* msg);
+
+struct osmo_fd* get_c_fd();
+struct osmo_fd* get_d_fd();
+
+#endif
+

Transceiver52M/ms/bladerf_specific.h

@@ -0,0 +1,482 @@
+#pragma once
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "itrq.h"
+#include <atomic>
+#include <complex>
+#include <cstdint>
+#include <functional>
+#include <iostream>
+#include <cassert>
+#include <cstring>
+
+#include <libbladeRF.h>
+#include <Timeval.h>
+#include <unistd.h>
+
+const size_t BLADE_BUFFER_SIZE = 1024 * 1;
+const size_t BLADE_NUM_BUFFERS = 32 * 1;
+const size_t NUM_TRANSFERS = 16 * 2;
+const int SAMPLE_SCALE_FACTOR = 15; // actually 16 but sigproc complains about clipping..
+
+template <typename Arg, typename... Args> void doPrint(std::ostream &out, Arg &&arg, Args &&...args)
+{
+	out << '(' << std::forward<Arg>(arg);
+	using expander = int[];
+	(void)expander{ 0, (void(out << ',' << std::forward<Args>(args)), 0)... };
+	out << ')' << std::endl;
+}
+
+template <class R, class... Args> using RvalFunc = R (*)(Args...);
+
+// specialisation for funcs which return a value
+template <class R, class... Args>
+R exec_and_check(RvalFunc<R, Args...> func, const char *fname, const char *finame, const char *funcname, int line,
+		 Args... args)
+{
+	R rval = func(std::forward<Args>(args)...);
+	if (rval != 0) {
+		std::cerr << ((rval >= 0) ? "OK:" : bladerf_strerror(rval)) << ':' << finame << ':' << line << ':'
+			  << funcname << ':' << fname;
+		doPrint(std::cerr, args...);
+	}
+	return rval;
+}
+
+// only macros can pass a func name string
+#define blade_check(func, ...) exec_and_check(func, #func, __FILE__, __FUNCTION__, __LINE__, __VA_ARGS__)
+
+#pragma pack(push, 1)
+using blade_sample_type = std::complex<int16_t>;
+enum class blade_speed_buffer_type { HS, SS };
+template <blade_speed_buffer_type T> struct blade_usb_message {
+	uint32_t reserved;
+	uint64_t ts;
+	uint32_t meta_flags;
+	blade_sample_type d[(T == blade_speed_buffer_type::SS ? 512 : 256) - 4];
+};
+
+static_assert(sizeof(blade_usb_message<blade_speed_buffer_type::SS>) == 2048, "blade buffer mismatch!");
+static_assert(sizeof(blade_usb_message<blade_speed_buffer_type::HS>) == 1024, "blade buffer mismatch!");
+template <unsigned int SZ, blade_speed_buffer_type T> struct blade_otw_buffer {
+	static_assert((SZ >= 2 && !(SZ % 2)), "min size is 2x usb buffer!");
+	blade_usb_message<T> m[SZ];
+	int actual_samples_per_msg()
+	{
+		return sizeof(blade_usb_message<T>::d) / sizeof(typeof(blade_usb_message<T>::d[0]));
+	}
+	int actual_samples_per_buffer()
+	{
+		return SZ * actual_samples_per_msg();
+	}
+	int samples_per_buffer()
+	{
+		return SZ * sizeof(blade_usb_message<T>) / sizeof(typeof(blade_usb_message<T>::d[0]));
+	}
+	int num_msgs_per_buffer()
+	{
+		return SZ;
+	}
+	auto get_first_ts()
+	{
+		return m[0].ts;
+	}
+	constexpr auto *getsampleoffset(int ofs)
+	{
+		auto full = ofs / actual_samples_per_msg();
+		auto rem = ofs % actual_samples_per_msg();
+		return &m[full].d[rem];
+	}
+	int readall(blade_sample_type *outaddr)
+	{
+		blade_sample_type *addr = outaddr;
+		for (int i = 0; i < SZ; i++) {
+			memcpy(addr, &m[i].d[0], actual_samples_per_msg() * sizeof(blade_sample_type));
+			addr += actual_samples_per_msg();
+		}
+		return actual_samples_per_buffer();
+	}
+	int read_n(blade_sample_type *outaddr, int start, int num)
+	{
+		assert((start + num) <= actual_samples_per_buffer());
+		assert(start >= 0);
+
+		if (!num)
+			return 0;
+
+		// which buffer?
+		int start_buf_idx = (start > 0) ? start / actual_samples_per_msg() : 0;
+		// offset from actual buffer start
+		auto start_offset_in_buf = (start - (start_buf_idx * actual_samples_per_msg()));
+		auto samp_rem_in_first_buf = actual_samples_per_msg() - start_offset_in_buf;
+		auto remaining_first_buf = num > samp_rem_in_first_buf ? samp_rem_in_first_buf : num;
+
+		memcpy(outaddr, &m[start_buf_idx].d[start_offset_in_buf],
+		       remaining_first_buf * sizeof(blade_sample_type));
+		outaddr += remaining_first_buf;
+
+		auto remaining = num - remaining_first_buf;
+
+		if (!remaining)
+			return num;
+
+		start_buf_idx++;
+
+		auto rem_full_bufs = remaining / actual_samples_per_msg();
+		remaining -= rem_full_bufs * actual_samples_per_msg();
+
+		for (int i = 0; i < rem_full_bufs; i++) {
+			memcpy(outaddr, &m[start_buf_idx++].d[0], actual_samples_per_msg() * sizeof(blade_sample_type));
+			outaddr += actual_samples_per_msg();
+		}
+
+		if (remaining)
+			memcpy(outaddr, &m[start_buf_idx].d[0], remaining * sizeof(blade_sample_type));
+		return num;
+	}
+	int write_n_burst(blade_sample_type *in, int num, uint64_t first_ts)
+	{
+		assert(num <= actual_samples_per_buffer());
+		int len_rem = num;
+		for (int i = 0; i < SZ; i++) {
+			m[i] = {};
+			m[i].ts = first_ts + i * actual_samples_per_msg();
+			if (len_rem) {
+				int max_to_copy =
+					len_rem > actual_samples_per_msg() ? actual_samples_per_msg() : len_rem;
+				memcpy(&m[i].d[0], in, max_to_copy * sizeof(blade_sample_type));
+				len_rem -= max_to_copy;
+				in += actual_samples_per_msg();
+			}
+		}
+		return num;
+	}
+};
+#pragma pack(pop)
+
+template <unsigned int SZ, blade_speed_buffer_type T> struct blade_otw_buffer_helper {
+	static_assert((SZ >= 1024 && ((SZ & (SZ - 1)) == 0)), "only buffer size multiples of 1024 allowed!");
+	static blade_otw_buffer<SZ / 512, T> x;
+};
+
+using dev_buf_t = typeof(blade_otw_buffer_helper<BLADE_BUFFER_SIZE, blade_speed_buffer_type::SS>::x);
+// using buf_in_use = blade_otw_buffer<2, blade_speed_buffer_type::SS>;
+using bh_fn_t = std::function<int(dev_buf_t *)>;
+
+template <typename T> struct blade_hw {
+	struct bladerf *dev;
+	struct bladerf_stream *rx_stream;
+	struct bladerf_stream *tx_stream;
+	// using pkt2buf = blade_otw_buffer<2, blade_speed_buffer_type::SS>;
+	using tx_buf_q_type = spsc_cond<BLADE_NUM_BUFFERS, dev_buf_t *, true, false>;
+	const unsigned int rxFullScale, txFullScale;
+	const int rxtxdelay;
+
+	float rxgain, txgain;
+
+	struct ms_trx_config {
+		int tx_freq;
+		int rx_freq;
+		int sample_rate;
+		int bandwidth;
+
+	    public:
+		ms_trx_config() : tx_freq(881e6), rx_freq(926e6), sample_rate(((1625e3 / 6) * 4)), bandwidth(1e6)
+		{
+		}
+	} cfg;
+
+	struct buf_mgmt {
+		void **rx_samples;
+		void **tx_samples;
+		tx_buf_q_type bufptrqueue;
+
+	} buf_mgmt;
+
+	virtual ~blade_hw()
+	{
+		close_device();
+	}
+	blade_hw() : rxFullScale(2047), txFullScale(2047), rxtxdelay(-60)
+	{
+	}
+
+	void close_device()
+	{
+		if (dev) {
+			if (rx_stream) {
+				bladerf_deinit_stream(rx_stream);
+			}
+
+			if (tx_stream) {
+				bladerf_deinit_stream(tx_stream);
+			}
+
+			bladerf_enable_module(dev, BLADERF_MODULE_RX, false);
+			bladerf_enable_module(dev, BLADERF_MODULE_TX, false);
+
+			bladerf_close(dev);
+			dev = NULL;
+		}
+	}
+
+	int init_device(bh_fn_t rxh, bh_fn_t txh)
+	{
+		struct bladerf_rational_rate rate = { 0, static_cast<uint64_t>((1625e3 * 4)) * 64, 6 * 64 }, actual;
+
+		bladerf_log_set_verbosity(BLADERF_LOG_LEVEL_DEBUG);
+		bladerf_set_usb_reset_on_open(true);
+		blade_check(bladerf_open, &dev, "");
+		if (!dev) {
+			std::cerr << "open failed, device missing?" << std::endl;
+			exit(0);
+		}
+		if (bladerf_device_speed(dev) != bladerf_dev_speed::BLADERF_DEVICE_SPEED_SUPER) {
+			std::cerr << "open failed, only superspeed (usb3) supported!" << std::endl;
+			return -1;
+		}
+
+		blade_check(bladerf_set_tuning_mode, dev, bladerf_tuning_mode::BLADERF_TUNING_MODE_FPGA);
+
+		bool is_locked;
+		blade_check(bladerf_set_pll_enable, dev, true);
+		blade_check(bladerf_set_pll_refclk, dev, 10000000UL);
+		for (int i = 0; i < 20; i++) {
+			usleep(50 * 1000);
+			bladerf_get_pll_lock_state(dev, &is_locked);
+
+			if (is_locked)
+				break;
+		}
+		if (!is_locked) {
+			std::cerr << "unable to lock refclk!" << std::endl;
+			return -1;
+		}
+
+		// bladerf_sample_rate r = (1625e3 * 4)/6, act;
+		// blade_check(bladerf_set_sample_rate,dev, BLADERF_CHANNEL_RX(0), r, &act);
+		// blade_check(bladerf_set_sample_rate,dev, BLADERF_CHANNEL_TX(0), r, &act);
+
+		// auto ratrate = (1625e3 * 4) / 6;
+		// rate.integer = (uint32_t)ratrate;
+		// rate.den = 10000;
+		// rate.num = (ratrate - rate.integer) * rate.den;
+
+		blade_check(bladerf_set_rational_sample_rate, dev, BLADERF_CHANNEL_RX(0), &rate, &actual);
+		blade_check(bladerf_set_rational_sample_rate, dev, BLADERF_CHANNEL_TX(0), &rate, &actual);
+
+		blade_check(bladerf_set_frequency, dev, BLADERF_CHANNEL_RX(0), (bladerf_frequency)cfg.rx_freq);
+		blade_check(bladerf_set_frequency, dev, BLADERF_CHANNEL_TX(0), (bladerf_frequency)cfg.tx_freq);
+
+		blade_check(bladerf_set_bandwidth, dev, BLADERF_CHANNEL_RX(0), (bladerf_bandwidth)cfg.bandwidth,
+			    (bladerf_bandwidth *)NULL);
+		blade_check(bladerf_set_bandwidth, dev, BLADERF_CHANNEL_TX(0), (bladerf_bandwidth)cfg.bandwidth,
+			    (bladerf_bandwidth *)NULL);
+
+		blade_check(bladerf_set_gain_mode, dev, BLADERF_CHANNEL_RX(0), BLADERF_GAIN_MGC);
+		// blade_check(bladerf_set_gain, dev, BLADERF_CHANNEL_RX(0), (bladerf_gain)30);
+		// blade_check(bladerf_set_gain, dev, BLADERF_CHANNEL_TX(0), (bladerf_gain)50);
+		usleep(1000);
+		blade_check(bladerf_enable_module, dev, BLADERF_MODULE_RX, true);
+		usleep(1000);
+		blade_check(bladerf_enable_module, dev, BLADERF_MODULE_TX, true);
+		usleep(1000);
+		blade_check(bladerf_init_stream, &rx_stream, dev, getrxcb(rxh), &buf_mgmt.rx_samples, BLADE_NUM_BUFFERS,
+			    BLADERF_FORMAT_SC16_Q11_META, BLADE_BUFFER_SIZE, NUM_TRANSFERS, (void *)this);
+
+		blade_check(bladerf_init_stream, &tx_stream, dev, gettxcb(txh), &buf_mgmt.tx_samples, BLADE_NUM_BUFFERS,
+			    BLADERF_FORMAT_SC16_Q11_META, BLADE_BUFFER_SIZE, NUM_TRANSFERS, (void *)this);
+
+		for (int i = 0; i < BLADE_NUM_BUFFERS; i++) {
+			auto cur_buffer = reinterpret_cast<tx_buf_q_type::elem_t *>(buf_mgmt.tx_samples);
+			buf_mgmt.bufptrqueue.spsc_push(&cur_buffer[i]);
+		}
+
+		setRxGain(20);
+		setTxGain(30);
+
+		usleep(1000);
+
+		// bladerf_set_stream_timeout(dev, BLADERF_TX, 4);
+		// bladerf_set_stream_timeout(dev, BLADERF_RX, 4);
+
+		return 0;
+	}
+
+	bool tuneTx(double freq, size_t chan = 0)
+	{
+		msleep(15);
+		blade_check(bladerf_set_frequency, dev, BLADERF_CHANNEL_TX(0), (bladerf_frequency)freq);
+		msleep(15);
+		return true;
+	};
+	bool tuneRx(double freq, size_t chan = 0)
+	{
+		msleep(15);
+		blade_check(bladerf_set_frequency, dev, BLADERF_CHANNEL_RX(0), (bladerf_frequency)freq);
+		msleep(15);
+		return true;
+	};
+	bool tuneRxOffset(double offset, size_t chan = 0)
+	{
+		return true;
+	};
+
+	double setRxGain(double dB, size_t chan = 0)
+	{
+		rxgain = dB;
+		msleep(15);
+		blade_check(bladerf_set_gain, dev, BLADERF_CHANNEL_RX(0), (bladerf_gain)dB);
+		msleep(15);
+		return dB;
+	};
+	double setTxGain(double dB, size_t chan = 0)
+	{
+		txgain = dB;
+		msleep(15);
+		blade_check(bladerf_set_gain, dev, BLADERF_CHANNEL_TX(0), (bladerf_gain)dB);
+		msleep(15);
+		return dB;
+	};
+	int setPowerAttenuation(int atten, size_t chan = 0)
+	{
+		return atten;
+	};
+
+	static void check_timestamp(dev_buf_t *rcd)
+	{
+		static bool first = true;
+		static uint64_t last_ts;
+		if (first) {
+			first = false;
+			last_ts = rcd->m[0].ts;
+		} else if (last_ts + rcd->actual_samples_per_buffer() != rcd->m[0].ts) {
+			std::cerr << "RX Overrun!" << last_ts << " " << rcd->actual_samples_per_buffer() << " "
+				  << last_ts + rcd->actual_samples_per_buffer() << " " << rcd->m[0].ts << std::endl;
+			last_ts = rcd->m[0].ts;
+		} else {
+			last_ts = rcd->m[0].ts;
+		}
+	}
+
+	bladerf_stream_cb getrxcb(bh_fn_t rxbh)
+	{
+		// C cb -> no capture!
+		static auto rxbhfn = rxbh;
+		return [](struct bladerf *dev, struct bladerf_stream *stream, struct bladerf_metadata *meta,
+			  void *samples, size_t num_samples, void *user_data) -> void * {
+			// struct blade_hw *trx = (struct blade_hw *)user_data;
+			static int to_skip = 0;
+			dev_buf_t *rcd = (dev_buf_t *)samples;
+
+			if (to_skip < 120) // prevents weird overflows on startup
+				to_skip++;
+			else {
+				check_timestamp(rcd);
+				rxbhfn(rcd);
+			}
+
+			return samples;
+		};
+	}
+	bladerf_stream_cb gettxcb(bh_fn_t txbh)
+	{
+		// C cb -> no capture!
+		static auto txbhfn = txbh;
+		return [](struct bladerf *dev, struct bladerf_stream *stream, struct bladerf_metadata *meta,
+			  void *samples, size_t num_samples, void *user_data) -> void * {
+			struct blade_hw *trx = (struct blade_hw *)user_data;
+			auto ptr = reinterpret_cast<tx_buf_q_type::elem_t>(samples);
+
+			if (samples) // put buffer address back into queue, ready to be reused
+				trx->buf_mgmt.bufptrqueue.spsc_push(&ptr);
+
+			return BLADERF_STREAM_NO_DATA;
+		};
+	}
+
+	auto get_rx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [this] {
+			int status;
+			set_name_aff_sched("rxrun", 2, SCHED_FIFO, sched_get_priority_max(SCHED_FIFO) - 2);
+			status = bladerf_stream(rx_stream, BLADERF_RX_X1);
+			if (status < 0)
+				std::cerr << "rx stream error! " << bladerf_strerror(status) << std::endl;
+
+			return NULL;
+		};
+		return fn;
+	}
+	auto get_tx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [this] {
+			int status;
+			set_name_aff_sched("txrun", 2, SCHED_FIFO, sched_get_priority_max(SCHED_FIFO) - 1);
+			status = bladerf_stream(tx_stream, BLADERF_TX_X1);
+			if (status < 0)
+				std::cerr << "rx stream error! " << bladerf_strerror(status) << std::endl;
+
+			return NULL;
+		};
+		return fn;
+	}
+
+	void submit_burst_ts(blade_sample_type *buffer, int len, uint64_t ts)
+	{
+		//get empty bufer from list
+		tx_buf_q_type::elem_t rcd;
+
+		while (!buf_mgmt.bufptrqueue.spsc_pop(&rcd))
+			buf_mgmt.bufptrqueue.spsc_prep_pop();
+		assert(rcd != nullptr);
+
+		rcd->write_n_burst(buffer, len, ts + rxtxdelay); // blade xa4 specific delay!
+		// blade_check(bladerf_submit_stream_buffer_nb, tx_stream, (void *)rcd, 100U);
+		blade_check(bladerf_submit_stream_buffer_nb, tx_stream, (void *)rcd);
+	}
+
+	void set_name_aff_sched(const char *name, int cpunum, int schedtype, int prio)
+	{
+		pthread_setname_np(pthread_self(), name);
+
+		cpu_set_t cpuset;
+
+		CPU_ZERO(&cpuset);
+		CPU_SET(cpunum, &cpuset);
+
+		auto rv = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+		if (rv < 0) {
+			std::cerr << name << " affinity: errreur! " << std::strerror(errno);
+			return exit(0);
+		}
+
+		sched_param sch_params;
+		sch_params.sched_priority = prio;
+		rv = pthread_setschedparam(pthread_self(), schedtype, &sch_params);
+		if (rv < 0) {
+			std::cerr << name << " sched: errreur! " << std::strerror(errno);
+			return exit(0);
+		}
+	}
+};

Transceiver52M/ms/ipc_specific.h

@@ -0,0 +1,259 @@
+#pragma once
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <complex>
+#include <cstring>
+#include <functional>
+#include <iostream>
+#include <thread>
+
+#include <Timeval.h>
+#include <vector>
+
+#include <ipcif.h>
+
+// typedef unsigned long long TIMESTAMP;
+using blade_sample_type = std::complex<int16_t>;
+const int SAMPLE_SCALE_FACTOR = 1;
+
+struct uhd_buf_wrap {
+	uint64_t ts;
+	uint32_t num_samps;
+	blade_sample_type *buf;
+	auto actual_samples_per_buffer()
+	{
+		return num_samps;
+	}
+	long get_first_ts()
+	{
+		return ts; //md->time_spec.to_ticks(rxticks);
+	}
+	int readall(blade_sample_type *outaddr)
+	{
+		memcpy(outaddr, buf, num_samps * sizeof(blade_sample_type));
+		return num_samps;
+	}
+	int read_n(blade_sample_type *outaddr, int start, int num)
+	{
+		// assert(start >= 0);
+		auto to_read = std::min((int)num_samps - start, num);
+		// assert(to_read >= 0);
+		memcpy(outaddr, buf + start, to_read * sizeof(blade_sample_type));
+		return to_read;
+	}
+};
+
+using dev_buf_t = uhd_buf_wrap;
+using bh_fn_t = std::function<int(dev_buf_t *)>;
+
+template <typename T> struct ipc_hw {
+	// uhd::usrp::multi_usrp::sptr dev;
+	// uhd::rx_streamer::sptr rx_stream;
+	// uhd::tx_streamer::sptr tx_stream;
+	blade_sample_type *one_pkt_buf;
+	std::vector<blade_sample_type *> pkt_ptrs;
+	size_t rx_spp;
+	double rxticks;
+	const unsigned int rxFullScale, txFullScale;
+	const int rxtxdelay;
+	float rxgain, txgain;
+	trxmsif m;
+
+	virtual ~ipc_hw()
+	{
+		delete[] one_pkt_buf;
+	}
+	ipc_hw() : rxFullScale(32767), txFullScale(32767), rxtxdelay(-67)
+	{
+	}
+
+	bool tuneTx(double freq, size_t chan = 0)
+	{
+		msleep(25);
+		// dev->set_tx_freq(freq, chan);
+		msleep(25);
+		return true;
+	};
+	bool tuneRx(double freq, size_t chan = 0)
+	{
+		msleep(25);
+		// dev->set_rx_freq(freq, chan);
+		msleep(25);
+		return true;
+	};
+	bool tuneRxOffset(double offset, size_t chan = 0)
+	{
+		return true;
+	};
+
+	double setRxGain(double dB, size_t chan = 0)
+	{
+		rxgain = dB;
+		msleep(25);
+		// dev->set_rx_gain(dB, chan);
+		msleep(25);
+		return dB;
+	};
+	double setTxGain(double dB, size_t chan = 0)
+	{
+		txgain = dB;
+		msleep(25);
+		// dev->set_tx_gain(dB, chan);
+		msleep(25);
+		return dB;
+	};
+	int setPowerAttenuation(int atten, size_t chan = 0)
+	{
+		return atten;
+	};
+
+	int init_device(bh_fn_t rxh, bh_fn_t txh)
+	{
+		// std::thread([] {
+		// 	osmo_ctx_init("bernd");
+		// 	osmo_select_init();
+		// 	main_ipc();
+		// 	while (true)
+		// 		osmo_select_main(0);
+		// }).detach();
+
+		return m.connect() ? 0: -1;
+	}
+
+	void *rx_cb(bh_fn_t burst_handler)
+	{
+		void *ret;
+		static int to_skip = 0;
+
+		blade_sample_type pbuf[508 * 2];
+
+		uint64_t t;
+
+		int len = 508 * 2;
+		m.read_dl(508 * 2, &t, pbuf);
+		// auto len = ipc_shm_read(ios_tx_to_device[0], (uint16_t *)&pbuf, 508 * 2, &t, 1);
+		// if(len < 0) {
+		// 	std::cerr << "fuck, rx fail!" << std::endl;
+		// 	exit(0);
+		// }
+
+		// uhd::rx_metadata_t md;
+		// auto num_rx_samps = rx_stream->recv(pkt_ptrs.front(), rx_spp, md, 3.0, true);
+
+		// if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) {
+		// 	std::cerr << boost::format("Timeout while streaming") << std::endl;
+		// 	exit(0);
+		// }
+		// if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_OVERFLOW) {
+		// 	std::cerr << boost::format("Got an overflow indication. Please consider the following:\n"
+		// 				   "  Your write medium must sustain a rate of %fMB/s.\n"
+		// 				   "  Dropped samples will not be written to the file.\n"
+		// 				   "  Please modify this example for your purposes.\n"
+		// 				   "  This message will not appear again.\n") %
+		// 			     1.f;
+		// 	exit(0);
+		// 	;
+		// }
+		// if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE) {
+		// 	std::cerr << str(boost::format("Receiver error: %s") % md.strerror());
+		// 	exit(0);
+		// }
+
+		dev_buf_t rcd = { t, static_cast<uint32_t>(len), pbuf };
+
+		if (to_skip < 120) // prevents weird overflows on startup
+			to_skip++;
+		else {
+			burst_handler(&rcd);
+		}
+
+		return ret;
+	}
+
+	auto get_rx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [this, burst_handler] {
+			pthread_setname_np(pthread_self(), "rxrun");
+			// wait_for_shm_open();
+			// uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
+			// stream_cmd.stream_now = true;
+			// stream_cmd.time_spec = uhd::time_spec_t();
+			// rx_stream->issue_stream_cmd(stream_cmd);
+
+			while (1) {
+				rx_cb(burst_handler);
+			}
+		};
+		return fn;
+	}
+	auto get_tx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [] {
+			// wait_for_shm_open();
+			// dummy
+		};
+		return fn;
+	}
+	void submit_burst_ts(blade_sample_type *buffer, int len, uint64_t ts)
+	{
+		// uhd::tx_metadata_t m = {};
+		// m.end_of_burst = true;
+		// m.start_of_burst = true;
+		// m.has_time_spec = true;
+		// m.time_spec = m.time_spec.from_ticks(ts + rxtxdelay, rxticks); // uhd specific b210 delay!
+		// std::vector<void *> ptrs(1, buffer);
+
+		// tx_stream->send(ptrs, len, m);
+
+		// uhd::async_metadata_t async_md;
+		// bool tx_ack = false;
+		// while (!tx_ack && tx_stream->recv_async_msg(async_md)) {
+		// 	tx_ack = (async_md.event_code == uhd::async_metadata_t::EVENT_CODE_BURST_ACK);
+		// }
+		// std::cout << (tx_ack ? "yay" : "nay") << " " << async_md.time_spec.to_ticks(rxticks) << std::endl;
+	}
+
+	void set_name_aff_sched(const char *name, int cpunum, int schedtype, int prio)
+	{
+		pthread_setname_np(pthread_self(), name);
+
+		// cpu_set_t cpuset;
+
+		// CPU_ZERO(&cpuset);
+		// CPU_SET(cpunum, &cpuset);
+
+		// auto rv = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+		// if (rv < 0) {
+		// 	std::cerr << name << " affinity: errreur! " << std::strerror(errno);
+		// 	return exit(0);
+		// }
+
+		// sched_param sch_params;
+		// sch_params.sched_priority = prio;
+		// rv = pthread_setschedparam(pthread_self(), schedtype, &sch_params);
+		// if (rv < 0) {
+		// 	std::cerr << name << " sched: errreur! " << std::strerror(errno);
+		// 	return exit(0);
+		// }
+	}
+};

Transceiver52M/ms/ipcif.c

@@ -0,0 +1,473 @@
+/*
+* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+* Author: Pau Espin Pedrol <pespin@sysmocom.de>
+*
+* SPDX-License-Identifier: 0BSD
+*
+* Permission to use, copy, modify, and/or distribute this software for any purpose
+* with or without fee is hereby granted.THE SOFTWARE IS PROVIDED "AS IS" AND THE
+* AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
+* BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
+* USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#define _GNU_SOURCE
+#include <pthread.h>
+
+#include <debug.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <inttypes.h>
+#include <sys/mman.h>
+#include <sys/stat.h> /* For mode constants */
+#include <fcntl.h> /* For O_* constants */
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+
+#include <shm.h>
+#include <ipc_shm.h>
+#include <ipc_chan.h>
+#include <ipc_sock.h>
+
+#define DEFAULT_SHM_NAME "/osmo-trx-ipc-driver-shm2"
+#define IPC_SOCK_PATH_PREFIX "/tmp"
+
+static void *tall_ctx;
+struct ipc_sock_state *global_ipc_sock_state;
+
+/* 8 channels are plenty */
+struct ipc_sock_state *global_ctrl_socks[8];
+struct ipc_shm_io *ios_tx_to_device[8];
+struct ipc_shm_io *ios_rx_from_device[8];
+
+void *shm;
+// void *global_dev;
+
+static pthread_mutex_t wait_open_lock;
+static pthread_cond_t wait_open_cond;
+
+
+static struct ipc_shm_region *decoded_region;
+
+static struct {
+	int msocknum;
+	char *ud_prefix_dir;
+} cmdline_cfg = { 1, IPC_SOCK_PATH_PREFIX };
+
+static const struct log_info_cat default_categories[] = {
+	[DMAIN] = {
+		.name = "DMAIN",
+		.color = NULL,
+		.description = "Main generic category",
+		.loglevel = LOGL_DEBUG,.enabled = 1,
+	},
+	[DDEV] = {
+		.name = "DDEV",
+		.description = "Device/Driver specific code",
+		.color = NULL,
+		.enabled = 1, .loglevel = LOGL_DEBUG,
+	},
+};
+
+const struct log_info log_infox = {
+	.cat = default_categories,
+	.num_cat = ARRAY_SIZE(default_categories),
+};
+
+volatile int ipc_exit_requested = 0;
+
+static int ipc_shm_setup(const char *shm_name, size_t shm_len)
+{
+	int fd;
+	int rc;
+
+	LOGP(DMAIN, LOGL_NOTICE, "Opening shm path %s\n", shm_name);
+	if ((fd = shm_open(shm_name, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR)) < 0) {
+		LOGP(DMAIN, LOGL_ERROR, "shm_open %d: %s\n", errno, strerror(errno));
+		rc = -errno;
+		goto err_shm_open;
+	}
+
+	LOGP(DMAIN, LOGL_NOTICE, "Truncating %d to size %zu\n", fd, shm_len);
+	if (ftruncate(fd, shm_len) < 0) {
+		LOGP(DMAIN, LOGL_ERROR, "ftruncate %d: %s\n", errno, strerror(errno));
+		rc = -errno;
+		goto err_mmap;
+	}
+
+	LOGP(DMAIN, LOGL_NOTICE, "mmaping shared memory fd %d\n", fd);
+	if ((shm = mmap(NULL, shm_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+		LOGP(DMAIN, LOGL_ERROR, "mmap %d: %s\n", errno, strerror(errno));
+		rc = -errno;
+		goto err_mmap;
+	}
+
+	LOGP(DMAIN, LOGL_NOTICE, "mmap'ed shared memory at addr %p\n", shm);
+	/* After a call to mmap(2) the file descriptor may be closed without affecting the memory mapping. */
+	close(fd);
+	return 0;
+err_mmap:
+	shm_unlink(shm_name);
+	close(fd);
+err_shm_open:
+	return rc;
+}
+
+struct msgb *ipc_msgb_alloc(uint8_t msg_type)
+{
+	struct msgb *msg;
+	struct ipc_sk_if *ipc_prim;
+
+	msg = msgb_alloc(sizeof(struct ipc_sk_if) + 1000, "ipc_sock_tx");
+	if (!msg)
+		return NULL;
+	msgb_put(msg, sizeof(struct ipc_sk_if) + 1000);
+	ipc_prim = (struct ipc_sk_if *)msg->data;
+	ipc_prim->msg_type = msg_type;
+
+	return msg;
+}
+
+static int ipc_tx_info_cnf()
+{
+	struct msgb *msg;
+	struct ipc_sk_if *ipc_prim;
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_INFO_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_if *)msg->data;
+
+	ipc_prim->u.info_cnf.feature_mask = FEATURE_MASK_CLOCKREF_EXTERNAL;
+	ipc_prim->u.info_cnf.iq_scaling_val_rx = 1;
+	ipc_prim->u.info_cnf.iq_scaling_val_tx = 1;
+	ipc_prim->u.info_cnf.max_num_chans = 1;
+	OSMO_STRLCPY_ARRAY(ipc_prim->u.info_cnf.dev_desc, "bernd");
+
+	struct ipc_sk_if_info_chan *chan_info = ipc_prim->u.info_cnf.chan_info;
+	OSMO_STRLCPY_ARRAY(chan_info->tx_path[0], "TX/RX");
+	OSMO_STRLCPY_ARRAY(chan_info->rx_path[0], "RX2");
+	chan_info->min_rx_gain = 0;
+	chan_info->max_rx_gain = 60;
+	chan_info->min_tx_gain = 0;
+	chan_info->max_tx_gain = 60;
+	chan_info->nominal_tx_power = 10;
+
+	return ipc_sock_send(msg);
+}
+
+static int ipc_tx_open_cnf(int rc, uint32_t num_chans, int32_t timingoffset)
+{
+	struct msgb *msg;
+	struct ipc_sk_if *ipc_prim;
+	struct ipc_sk_if_open_cnf_chan *chan_info;
+	unsigned int i;
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_OPEN_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_if *)msg->data;
+	ipc_prim->u.open_cnf.return_code = rc;
+	ipc_prim->u.open_cnf.path_delay = timingoffset; // 6.18462e-5 * 1625e3 / 6;
+	OSMO_STRLCPY_ARRAY(ipc_prim->u.open_cnf.shm_name, DEFAULT_SHM_NAME);
+
+	chan_info = ipc_prim->u.open_cnf.chan_info;
+	for (i = 0; i < num_chans; i++) {
+		snprintf(chan_info->chan_ipc_sk_path, sizeof(chan_info->chan_ipc_sk_path), "%s/ipc_sock%d_%d",
+			 cmdline_cfg.ud_prefix_dir, cmdline_cfg.msocknum, i);
+		/* FIXME: dynamc chan limit, currently 8 */
+		if (i < 8)
+			ipc_sock_init(chan_info->chan_ipc_sk_path, &global_ctrl_socks[i], ipc_chan_sock_accept, i);
+		chan_info++;
+	}
+
+	return ipc_sock_send(msg);
+}
+
+int ipc_rx_greeting_req(struct ipc_sk_if_greeting *greeting_req)
+{
+	struct msgb *msg;
+	struct ipc_sk_if *ipc_prim;
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_GREETING_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_if *)msg->data;
+	ipc_prim->u.greeting_cnf.req_version =
+		greeting_req->req_version == IPC_SOCK_API_VERSION ? IPC_SOCK_API_VERSION : 0;
+
+	ipc_sock_send(msg);
+	return 0;
+}
+
+int ipc_rx_info_req(struct ipc_sk_if_info_req *info_req)
+{
+	ipc_tx_info_cnf();
+	return 0;
+}
+
+int ipc_rx_open_req(struct ipc_sk_if_open_req *open_req)
+{
+	/* calculate size needed */
+	unsigned int len;
+	unsigned int i;
+
+	// global_dev = uhdwrap_open(open_req);
+
+	/* b210 packet size is 2040, but our tx size is 2500, so just do *2 */
+	int shmbuflen = 5000 * 2;
+
+	len = ipc_shm_encode_region(NULL, open_req->num_chans, 4, shmbuflen);
+	/* Here we verify num_chans, rx_path, tx_path, clockref, etc. */
+	int rc = ipc_shm_setup(DEFAULT_SHM_NAME, len);
+	len = ipc_shm_encode_region((struct ipc_shm_raw_region *)shm, open_req->num_chans, 4, shmbuflen);
+	//	LOGP(DMAIN, LOGL_NOTICE, "%s\n", osmo_hexdump((const unsigned char *)shm, 80));
+
+	/* set up our own copy of the decoded area, we have to do it here,
+	* since the uhd wrapper does not allow starting single channels
+	* additionally go for the producer init for both, so only we are responsible for the init, instead
+	* of splitting it with the client and causing potential races if one side uses it too early */
+	decoded_region = ipc_shm_decode_region(0, (struct ipc_shm_raw_region *)shm);
+	for (i = 0; i < open_req->num_chans; i++) {
+		//		ios_tx_to_device[i] = ipc_shm_init_consumer(decoded_region->channels[i]->dl_stream);
+		ios_tx_to_device[i] = ipc_shm_init_producer(decoded_region->channels[i]->dl_stream);
+		ios_rx_from_device[i] = ipc_shm_init_producer(decoded_region->channels[i]->ul_stream);
+	}
+
+	ipc_tx_open_cnf(-rc, open_req->num_chans, 0);
+	return 0;
+}
+
+volatile bool ul_running = false;
+volatile bool dl_running = false;
+
+void *uplink_thread(void *x_void_ptr)
+{
+	uint32_t chann = decoded_region->num_chans;
+	ul_running = true;
+	pthread_setname_np(pthread_self(), "uplink_rx");
+
+	while (!ipc_exit_requested) {
+		// int32_t read = uhdwrap_read(global_dev, chann);
+		// ipc_shm_enqueue(ios_rx_from_device[i], tstamp, num_rx_samps, (uint16_t *)&d->wrap_rx_buffs[i].front());
+		if (read < 0)
+			return 0;
+	}
+	return 0;
+}
+
+void *downlink_thread(void *x_void_ptr)
+{
+	int chann = decoded_region->num_chans;
+	dl_running = true;
+	pthread_setname_np(pthread_self(), "downlink_tx");
+
+	while (!ipc_exit_requested) {
+		bool underrun;
+		// uhdwrap_write(global_dev, chann, &underrun);
+
+		// len = ipc_shm_read(ios_tx_to_device[i], (uint16_t *)&d->wrap_tx_buffs[i].front(), 5000, &timestamp, 1);
+		// return d->writeSamples(d->wrap_tx_buf_ptrs, len, underrun, timestamp);
+	}
+	return 0;
+}
+
+int ipc_rx_chan_start_req(struct ipc_sk_chan_if_op_void *req, uint8_t chan_nr)
+{
+	struct msgb *msg;
+	struct ipc_sk_chan_if *ipc_prim;
+	int rc = 0;
+
+	// rc = uhdwrap_start(global_dev, chan_nr);
+
+	pthread_cond_broadcast(&wait_open_cond);
+	// /* no per-chan start/stop */
+	// if (!dl_running || !ul_running) {
+	// 	/* chan != first chan start will "fail", which is fine, usrp can't start/stop chans independently */
+	// 	if (rc) {
+	// 		LOGP(DMAIN, LOGL_INFO, "starting rx/tx threads.. req for chan:%d\n", chan_nr);
+	// 		pthread_t rx, tx;
+	// 		pthread_create(&rx, NULL, uplink_thread, 0);
+	// 		pthread_create(&tx, NULL, downlink_thread, 0);
+	// 	}
+	// } else
+	// 	LOGP(DMAIN, LOGL_INFO, "starting rx/tx threads request ignored.. req for chan:%d\n", chan_nr);
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_START_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_chan_if *)msg->data;
+	ipc_prim->u.start_cnf.return_code = rc ? 0 : -1;
+
+	return ipc_chan_sock_send(msg, chan_nr);
+}
+int ipc_rx_chan_stop_req(struct ipc_sk_chan_if_op_void *req, uint8_t chan_nr)
+{
+	struct msgb *msg;
+	struct ipc_sk_chan_if *ipc_prim;
+	int rc = true;
+
+	/* no per-chan start/stop */
+	// rc = uhdwrap_stop(global_dev, chan_nr);
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_STOP_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_chan_if *)msg->data;
+	ipc_prim->u.stop_cnf.return_code = rc ? 0 : -1;
+
+	return ipc_chan_sock_send(msg, chan_nr);
+}
+int ipc_rx_chan_setgain_req(struct ipc_sk_chan_if_gain *req, uint8_t chan_nr)
+{
+	struct msgb *msg;
+	struct ipc_sk_chan_if *ipc_prim;
+	double rv = req->gain;
+
+	// rv = uhdwrap_set_gain(global_dev, req->gain, chan_nr, req->is_tx);
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_SETGAIN_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_chan_if *)msg->data;
+	ipc_prim->u.set_gain_cnf.is_tx = req->is_tx;
+	ipc_prim->u.set_gain_cnf.gain = rv;
+
+	return ipc_chan_sock_send(msg, chan_nr);
+}
+
+int ipc_rx_chan_setfreq_req(struct ipc_sk_chan_if_freq_req *req, uint8_t chan_nr)
+{
+	struct msgb *msg;
+	struct ipc_sk_chan_if *ipc_prim;
+	bool rv = true;
+
+	// rv = uhdwrap_set_freq(global_dev, req->freq, chan_nr, req->is_tx);
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_SETFREQ_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_chan_if *)msg->data;
+	ipc_prim->u.set_freq_cnf.return_code = rv ? 0 : 1;
+
+	return ipc_chan_sock_send(msg, chan_nr);
+}
+
+int ipc_rx_chan_settxatten_req(struct ipc_sk_chan_if_tx_attenuation *req, uint8_t chan_nr)
+{
+	struct msgb *msg;
+	struct ipc_sk_chan_if *ipc_prim;
+	double rv = req->attenuation;
+
+	// rv = uhdwrap_set_txatt(global_dev, req->attenuation, chan_nr);
+
+	msg = ipc_msgb_alloc(IPC_IF_MSG_SETTXATTN_CNF);
+	if (!msg)
+		return -ENOMEM;
+	ipc_prim = (struct ipc_sk_chan_if *)msg->data;
+	ipc_prim->u.txatten_cnf.attenuation = rv;
+
+	return ipc_chan_sock_send(msg, chan_nr);
+}
+
+int ipc_sock_init(const char *path, struct ipc_sock_state **global_state_var,
+		  int (*sock_callback_fn)(struct osmo_fd *fd, unsigned int what), int n)
+{
+	struct ipc_sock_state *state;
+	struct osmo_fd *bfd;
+	int rc;
+
+	state = talloc_zero(NULL, struct ipc_sock_state);
+	if (!state)
+		return -ENOMEM;
+	*global_state_var = state;
+
+	INIT_LLIST_HEAD(&state->upqueue);
+	state->conn_bfd.fd = -1;
+
+	bfd = &state->listen_bfd;
+
+	bfd->fd = osmo_sock_unix_init(SOCK_SEQPACKET, 0, path, OSMO_SOCK_F_BIND);
+	if (bfd->fd < 0) {
+		LOGP(DMAIN, LOGL_ERROR, "Could not create %s unix socket: %s\n", path, strerror(errno));
+		talloc_free(state);
+		return -1;
+	}
+
+	osmo_fd_setup(bfd, bfd->fd, OSMO_FD_READ, sock_callback_fn, state, n);
+
+	rc = osmo_fd_register(bfd);
+	if (rc < 0) {
+		LOGP(DMAIN, LOGL_ERROR, "Could not register listen fd: %d\n", rc);
+		close(bfd->fd);
+		talloc_free(state);
+		return rc;
+	}
+
+	LOGP(DMAIN, LOGL_INFO, "Started listening on IPC socket: %s\n", path);
+
+	return 0;
+}
+
+int main_ipc()
+{
+	char *ipc_msock_path = "/tmp/ipc_sock1";
+	tall_ctx = talloc_named_const(NULL, 0, "trx-ipc-ms");
+	msgb_talloc_ctx_init(tall_ctx, 0);
+	osmo_init_logging2(tall_ctx, &log_infox);
+	log_enable_multithread();
+
+	LOGP(DMAIN, LOGL_INFO, "Starting %s\n", "bernd");
+	ipc_sock_init(ipc_msock_path, &global_ipc_sock_state, ipc_sock_accept, 0);
+	// while (!ipc_exit_requested)
+	// 	osmo_select_main(0);
+
+	// if (global_dev) {
+	// 	unsigned int i;
+	// 	for (i = 0; i < decoded_region->num_chans; i++)
+	// 		uhdwrap_stop(global_dev, i);
+	// }
+
+	// ipc_sock_close(global_ipc_sock_state);
+
+	int rv;
+	pthread_condattr_t t2;
+	rv = pthread_condattr_setpshared(&t2, PTHREAD_PROCESS_SHARED);
+	rv = pthread_cond_init(&wait_open_cond, &t2);
+
+
+	return 0;
+}
+
+int wait_for_shm_open()
+{
+	struct timespec tv;
+	int rv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	tv.tv_sec += 15;
+
+	rv = pthread_mutex_timedlock(&wait_open_lock, &tv);
+	if (rv != 0)
+		return -rv;
+
+	rv = pthread_cond_timedwait(&wait_open_cond, &wait_open_lock, &tv);
+	return rv;
+}

Transceiver52M/ms/ms_commandhandler.cpp

@@ -0,0 +1,232 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <radioInterface.h>
+#include "l1if.h"
+#include "ms_rx_upper.h"
+#include "syncthing.h"
+#include "ms_state.h"
+
+void upper_trx::driveControl()
+{
+#ifdef IPCIF
+	auto m = pop_c();
+	if (!m)
+		return;
+#else
+	TRX_C cmd;
+
+	socklen_t addr_len = sizeof(ctrlsrc);
+	int rdln = recvfrom(mCtrlSockets, (void *)cmd.cmd, sizeof(cmd) - 1, 0, &ctrlsrc, &addr_len);
+	if (rdln < 0 && errno == EAGAIN) {
+		std::cerr << "fuck, send ctrl?" << std::endl;
+		exit(0);
+	}
+
+	TRX_C *m = &cmd;
+#endif
+
+	auto response = (TRX_C *)malloc(sizeof(TRX_C));
+	response->cmd[0] = '\0';
+	commandhandler(m->cmd, response->cmd);
+#ifdef IPCIF
+	free(m);
+#endif
+	std::clog << "response is " << response->cmd << std::endl;
+#ifdef IPCIF
+	push_c(response);
+#else
+
+	int rv = sendto(mCtrlSockets, response, strlen(response->cmd) + 1, 0, &ctrlsrc, sizeof(struct sockaddr_in));
+	if (rv < 0) {
+		std::cerr << "fuck, rcv ctrl?" << std::endl;
+		exit(0);
+	}
+	free(response);
+
+#endif
+}
+
+void upper_trx::commandhandler(char *buffer, char *response)
+{
+	int MAX_PACKET_LENGTH = TRXC_BUF_SIZE;
+
+	char cmdcheck[4];
+	char command[MAX_PACKET_LENGTH];
+
+	sscanf(buffer, "%3s %s", cmdcheck, command);
+
+	if (strcmp(cmdcheck, "CMD") != 0) {
+		LOG(WARNING) << "bogus message on control interface";
+		return;
+	}
+	std::clog << "command is " << buffer << std::endl << std::flush;
+
+	if (strcmp(command, "MEASURE") == 0) {
+		msleep(100);
+		int freq;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &freq);
+		sprintf(response, "RSP MEASURE 0 %d -80", freq);
+	} else if (strcmp(command, "ECHO") == 0) {
+		msleep(100);
+		sprintf(response, "RSP ECHO 0");
+	} else if (strcmp(command, "POWEROFF") == 0) {
+		set_ta(0);
+		// turn off transmitter/demod
+		// set_upper_ready(false);
+
+		sprintf(response, "RSP POWEROFF 0");
+	} else if (strcmp(command, "POWERON") == 0) {
+		// turn on transmitter/demod
+		if (!mTxFreq || !mRxFreq)
+			sprintf(response, "RSP POWERON 1");
+		else {
+			sprintf(response, "RSP POWERON 0");
+			if (!mOn) {
+				// Prepare for thread start
+				mPower = -20;
+				// start_ms();
+				set_upper_ready(true);
+
+				writeClockInterface();
+				mOn = true;
+			}
+		}
+	} else if (strcmp(command, "SETMAXDLY") == 0) {
+		//set expected maximum time-of-arrival
+		int maxDelay;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &maxDelay);
+		mMaxExpectedDelay = maxDelay; // 1 GSM symbol is approx. 1 km
+		sprintf(response, "RSP SETMAXDLY 0 %d", maxDelay);
+	} else if (strcmp(command, "SETRXGAIN") == 0) {
+		//set expected maximum time-of-arrival
+		int newGain;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &newGain);
+		newGain = setRxGain(newGain);
+		sprintf(response, "RSP SETRXGAIN 0 %d", newGain);
+	} else if (strcmp(command, "NOISELEV") == 0) {
+		if (mOn) {
+			float lev = 0; //mStates[chan].mNoiseLev;
+			sprintf(response, "RSP NOISELEV 0 %d", (int)round(20.0 * log10(rxFullScale / lev)));
+		} else {
+			sprintf(response, "RSP NOISELEV 1  0");
+		}
+	} else if (!strcmp(command, "SETPOWER")) {
+		// set output power in dB
+		int dbPwr;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &dbPwr);
+		if (!mOn)
+			sprintf(response, "RSP SETPOWER 1 %d", dbPwr);
+		else {
+			mPower = dbPwr;
+			setPowerAttenuation(mPower);
+			sprintf(response, "RSP SETPOWER 0 %d", dbPwr);
+		}
+	} else if (!strcmp(command, "ADJPOWER")) {
+		// adjust power in dB steps
+		int dbStep;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &dbStep);
+		if (!mOn)
+			sprintf(response, "RSP ADJPOWER 1 %d", mPower);
+		else {
+			mPower += dbStep;
+			setPowerAttenuation(mPower);
+			sprintf(response, "RSP ADJPOWER 0 %d", mPower);
+		}
+	} else if (strcmp(command, "RXTUNE") == 0) {
+		// tune receiver
+		int freqKhz;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &freqKhz);
+		mRxFreq = freqKhz * 1e3;
+		if (!tuneRx(mRxFreq)) {
+			LOG(ALERT) << "RX failed to tune";
+			sprintf(response, "RSP RXTUNE 1 %d", freqKhz);
+		} else
+			sprintf(response, "RSP RXTUNE 0 %d", freqKhz);
+	} else if (strcmp(command, "TXTUNE") == 0) {
+		// tune txmtr
+		int freqKhz;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &freqKhz);
+		mTxFreq = freqKhz * 1e3;
+		if (!tuneTx(mTxFreq)) {
+			LOG(ALERT) << "TX failed to tune";
+			sprintf(response, "RSP TXTUNE 1 %d", freqKhz);
+		} else
+			sprintf(response, "RSP TXTUNE 0 %d", freqKhz);
+	} else if (!strcmp(command, "SETTSC")) {
+		// set TSC
+		unsigned TSC;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &TSC);
+		if (mOn)
+			sprintf(response, "RSP SETTSC 1 %d", TSC);
+		// else if (chan && (TSC != mTSC))
+		// 	sprintf(response, "RSP SETTSC 1 %d", TSC);
+		else {
+			mTSC = TSC;
+			//generateMidamble(rx_sps, TSC);
+			sprintf(response, "RSP SETTSC 0 %d", TSC);
+		}
+	} else if (!strcmp(command, "GETBSIC")) {
+		if (mBSIC < 0)
+			sprintf(response, "RSP GETBSIC 1");
+		else
+			sprintf(response, "RSP GETBSIC 0 %d", mBSIC);
+	} else if (strcmp(command, "SETSLOT") == 0) {
+		// set TSC
+		int corrCode;
+		int timeslot;
+		sscanf(buffer, "%3s %s %d %d", cmdcheck, command, &timeslot, &corrCode);
+		if ((timeslot < 0) || (timeslot > 7)) {
+			LOG(WARNING) << "bogus message on control interface";
+			sprintf(response, "RSP SETSLOT 1 %d %d", timeslot, corrCode);
+			return;
+		}
+		mStates.chanType[timeslot] = (ChannelCombination)corrCode;
+		mStates.setModulus(timeslot);
+		sprintf(response, "RSP SETSLOT 0 %d %d", timeslot, corrCode);
+	} else if (!strcmp(command, "SETRXMASK")) {
+		int slot;
+		unsigned long long mask;
+		sscanf(buffer, "%3s %s %d 0x%llx", cmdcheck, command, &slot, &mask);
+		if ((slot < 0) || (slot > 7)) {
+			sprintf(response, "RSP SETRXMASK 1");
+		} else {
+			mRxSlotMask[slot] = mask;
+			sprintf(response, "RSP SETRXMASK 0 %d 0x%llx", slot, mask);
+		}
+	} else if (!strcmp(command, "SYNC")) {
+		// msleep(10);
+		mStates.mode = trx_mode::TRX_MODE_MS_TRACK;
+		sprintf(response, "RSP SYNC 0");
+		mMaxExpectedDelay = 48;
+		// setRxGain(30);
+		// msleep(10);
+	} else if (!strcmp(command, "SETTA")) {
+		int ta;
+		sscanf(buffer, "%3s %s %d", cmdcheck, command, &ta);
+		set_ta(ta);
+		sprintf(response, "RSP SETTA 0 %d", ta);
+	} else {
+		LOG(WARNING) << "bogus command " << command << " on control interface.";
+	}
+
+	//mCtrlSockets[chan]->write(response, strlen(response) + 1);
+}

Transceiver52M/ms/ms_rx_burst.cpp

@@ -0,0 +1,211 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include "syncthing.h"
+#include "sigProcLib.h"
+#include "signalVector.h"
+#include "grgsm_vitac/grgsm_vitac.h"
+extern "C" {
+#include "sch.h"
+}
+
+#if !defined(SYNCTHINGONLY) || !defined(NODAMNLOG)
+#define DBGLG(...) ms_trx::dummy_log()
+#else
+#define DBGLG(...) std::cerr
+#endif
+
+#if !defined(SYNCTHINGONLY)
+#define DBGLG2(...) ms_trx::dummy_log()
+#else
+#define DBGLG2(...) std::cerr
+#endif
+
+__attribute__((xray_always_instrument)) __attribute__((noinline)) static bool decode_sch(float *bits,
+											 bool update_global_clock)
+{
+	struct sch_info sch;
+	ubit_t info[GSM_SCH_INFO_LEN];
+	sbit_t data[GSM_SCH_CODED_LEN];
+
+	float_to_sbit(&bits[3], &data[0], 62, 39);
+	float_to_sbit(&bits[106], &data[39], 62, 39);
+
+	if (!gsm_sch_decode(info, data)) {
+		gsm_sch_parse(info, &sch);
+
+		DBGLG() << "SCH : Decoded values" << std::endl;
+		DBGLG() << "    BSIC: " << sch.bsic << std::endl;
+		DBGLG() << "    TSC: " << (sch.bsic & 0x7) << std::endl;
+		DBGLG() << "    T1  : " << sch.t1 << std::endl;
+		DBGLG() << "    T2  : " << sch.t2 << std::endl;
+		DBGLG() << "    T3p : " << sch.t3p << std::endl;
+		DBGLG() << "    FN  : " << gsm_sch_to_fn(&sch) << std::endl;
+		return true;
+	}
+	return false;
+}
+
+static void check_rcv_fn(GSM::Time t, bool first, unsigned int &lastfn, unsigned int &fnbm)
+{
+	if (first && t.TN() == 0) {
+		lastfn = t.FN();
+		fnbm = 1 << 0;
+		first = false;
+	}
+	if (!first && t.FN() != lastfn) {
+		if (fnbm != 255)
+			std::cerr << "rx " << lastfn << ":" << fnbm << " " << __builtin_popcount(fnbm) << std::endl;
+		lastfn = t.FN();
+		fnbm = 1 << t.TN();
+	}
+
+	fnbm |= 1 << t.TN();
+}
+
+__attribute__((xray_always_instrument)) __attribute__((noinline)) static void
+handle_it(one_burst &e, signalVector &burst, unsigned int tsc)
+{
+	memset(burst.begin(), 0, burst.size() * sizeof(std::complex<float>));
+	auto is_sch = gsm_sch_check_fn(e.gsmts.FN()) && e.gsmts.TN() == 0;
+	auto is_fcch = gsm_fcch_check_fn(e.gsmts.FN()) && e.gsmts.TN() == 0;
+
+	// if (is_sch)
+	// 	return;
+
+	if (is_fcch)
+		return;
+
+	if (is_sch) {
+		unsigned char outbin[148];
+		convert_and_scale_default<float, int16_t>(burst.begin(), e.burst, ONE_TS_BURST_LEN * 2);
+		std::stringstream dbgout;
+#if 0
+		{
+			struct estim_burst_params ebp;
+			auto rv2 = detectSCHBurst(burst, 4, 4, sch_detect_type::SCH_DETECT_FULL, &ebp);
+			auto bits = demodAnyBurst(burst, SCH, 4, &ebp);
+			// clamp_array(bits->begin(), 148, 1.5f);
+			for (auto &i : *bits)
+				i = (i > 0 ? 1 : -1);
+
+			auto rv = decode_sch(bits->begin(), false);
+			dbgout << "U DET@" << (rv2 ? "yes " : "   ") << "Timing offset     " << ebp.toa
+			       << " symbols, DECODE: " << (rv ? "yes" : "---") << " ";
+
+			delete bits;
+		}
+#endif
+		{
+			convert_and_scale<float, float>(burst.begin(), burst.begin(), ONE_TS_BURST_LEN * 2,
+							1.f / 32767.f);
+
+			std::complex<float> channel_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+			auto ss = reinterpret_cast<std::complex<float> *>(burst.begin());
+			int d_c0_burst_start = get_sch_chan_imp_resp(ss, &channel_imp_resp[0]);
+			detect_burst(ss, &channel_imp_resp[0], d_c0_burst_start, outbin);
+
+			SoftVector bits;
+			bits.resize(148);
+			for (int i = 0; i < 148; i++) {
+				bits[i] = (!outbin[i]) < 1 ? -1 : 1;
+			}
+
+			auto rv = decode_sch(bits.begin(), false);
+			dbgout << "U SCH@"
+			       << " " << e.gsmts.FN() << ":" << e.gsmts.TN() << " " << d_c0_burst_start
+			       << " DECODE:" << (rv ? "yes" : "---") << std::endl;
+		}
+
+		DBGLG() << dbgout.str();
+		return;
+	}
+#if 1
+	convert_and_scale<float, int16_t>(burst.begin(), e.burst, ONE_TS_BURST_LEN * 2, 1.f / 2047.f);
+	// std::cerr << "@" << tsc << " " << e.gsmts.FN() << ":" << e.gsmts.TN() << " " << ebp.toa << " "
+	// 	  << std::endl;
+
+	unsigned char outbin[148];
+	auto ss = reinterpret_cast<std::complex<float> *>(burst.begin());
+	float ncmax, dcmax;
+	std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR], chan_imp_resp2[CHAN_IMP_RESP_LENGTH * d_OSR];
+	auto normal_burst_start = get_norm_chan_imp_resp(ss, &chan_imp_resp[0], &ncmax, tsc);
+	auto dummy_burst_start = get_norm_chan_imp_resp(ss, &chan_imp_resp2[0], &dcmax, TS_DUMMY);
+	auto is_nb = ncmax > dcmax;
+
+	DBGLG() << " U " << (is_nb ? "NB" : "DB") << "@ o nb: " << normal_burst_start << " o db: " << dummy_burst_start
+		<< std::endl;
+
+	if (is_nb)
+		detect_burst(ss, &chan_imp_resp[0], normal_burst_start, outbin);
+	else
+		detect_burst(ss, &chan_imp_resp2[0], dummy_burst_start, outbin);
+	;
+
+	auto bits = SoftVector(148);
+	for (int i = 0; i < 148; i++)
+		(bits)[i] = outbin[i] < 1 ? -1 : 1;
+
+#endif
+}
+
+__attribute__((xray_always_instrument)) __attribute__((noinline)) void rcv_bursts_test(rx_queue_t *q, unsigned int *tsc)
+{
+	static bool first = true;
+	unsigned int lastfn = 0;
+	unsigned int fnbm = 0;
+	signalVector burst(ONE_TS_BURST_LEN, 100, 100);
+
+	cpu_set_t cpuset;
+
+	CPU_ZERO(&cpuset);
+	CPU_SET(1, &cpuset);
+
+	auto rv = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+	if (rv < 0) {
+		std::cerr << "affinity: errreur! " << std::strerror(errno);
+		exit(0);
+	}
+
+	int prio = sched_get_priority_max(SCHED_RR);
+	struct sched_param param;
+	param.sched_priority = prio;
+	rv = sched_setscheduler(0, SCHED_RR, &param);
+	if (rv < 0) {
+		std::cerr << "scheduler: errreur! " << std::strerror(errno);
+		exit(0);
+	}
+
+	while (1) {
+		one_burst e;
+		while (!q->spsc_pop(&e)) {
+			q->spsc_prep_pop();
+		}
+
+		check_rcv_fn(e.gsmts, first, lastfn, fnbm);
+
+		handle_it(e, burst, *tsc);
+
+		// rv = detectSCHBurst(*burst, 4, 4, sch_detect_type::SCH_DETECT_FULL, &ebp);
+		// if (rv > 0)
+		// 	std::cerr << "#" << e.gsmts.FN() << ":" << e.gsmts.TN() << " " << ebp.toa << std::endl;
+		// sched_yield();
+	}
+}

Transceiver52M/ms/ms_rx_burst.h

@@ -0,0 +1,25 @@
+#pragma once
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "syncthing.h"
+
+void rcv_bursts_test(rx_queue_t *q, unsigned int *tsc);

Transceiver52M/ms/ms_rx_lower.cpp

@@ -0,0 +1,350 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "sigProcLib.h"
+#include "signalVector.h"
+#include <atomic>
+#include <cassert>
+#include <complex>
+#include <iostream>
+#include <future>
+
+#include "syncthing.h"
+#include "grgsm_vitac/grgsm_vitac.h"
+
+extern "C" {
+#include "sch.h"
+}
+
+#ifdef LOG
+#undef LOG
+#endif
+
+#if !defined(SYNCTHINGONLY) //|| !defined(NODAMNLOG)
+#define DBGLG(...) ms_trx::dummy_log()
+#else
+#define DBGLG(...) std::cerr
+#endif
+
+#if !defined(SYNCTHINGONLY) || !defined(NODAMNLOG)
+#define DBGLG2(...) ms_trx::dummy_log()
+#else
+#define DBGLG2(...) std::cerr
+#endif
+
+#define PRINT_Q_OVERFLOW
+__attribute__((xray_always_instrument)) __attribute__((noinline)) bool ms_trx::decode_sch(float *bits,
+											  bool update_global_clock)
+{
+	int fn;
+	struct sch_info sch;
+	ubit_t info[GSM_SCH_INFO_LEN];
+	sbit_t data[GSM_SCH_CODED_LEN];
+
+	float_to_sbit(&bits[3], &data[0], 62, 39);
+	float_to_sbit(&bits[106], &data[39], 62, 39);
+
+	if (!gsm_sch_decode(info, data)) {
+		gsm_sch_parse(info, &sch);
+
+		if (update_global_clock) {
+			DBGLG() << "SCH : Decoded values" << std::endl;
+			DBGLG() << "    BSIC: " << sch.bsic << std::endl;
+			DBGLG() << "    TSC: " << (sch.bsic & 0x7) << std::endl;
+			DBGLG() << "    T1  : " << sch.t1 << std::endl;
+			DBGLG() << "    T2  : " << sch.t2 << std::endl;
+			DBGLG() << "    T3p : " << sch.t3p << std::endl;
+			DBGLG() << "    FN  : " << gsm_sch_to_fn(&sch) << std::endl;
+		}
+
+		fn = gsm_sch_to_fn(&sch);
+		if (fn < 0) { // how? wh?
+			DBGLG() << "SCH : Failed to convert FN " << std::endl;
+			return false;
+		}
+
+		if (update_global_clock) {
+			mBSIC = sch.bsic;
+			mTSC = sch.bsic & 0x7;
+			timekeeper.set(fn, 0);
+			// global_time_keeper.FN(fn);
+			// global_time_keeper.TN(0);
+		}
+#ifdef SYNCTHINGONLY
+		else {
+			int t3 = sch.t3p * 10 + 1;
+			if (t3 == 11) {
+				// timeslot hitter attempt @ fn 21 in mf
+				DBGLG2() << "sch @ " << t3 << std::endl;
+				auto e = GSM::Time(fn, 0);
+				e += 10;
+				ts_hitter_q.spsc_push(&e);
+			}
+		}
+#endif
+		// auto sch11 = gsm_sch_check_fn(fn + 11);
+		// DBGLG() << "next sch: "<< (sch11 ? "11":"10")<<" first ts " << first_sch_buf_rcv_ts << std::endl;
+		return true;
+	}
+	return false;
+}
+
+void ms_trx::maybe_update_gain(one_burst &brst)
+{
+	static_assert((sizeof(brst.burst) / sizeof(brst.burst[0])) == ONE_TS_BURST_LEN, "wtf, buffer size mismatch?");
+	const int avgburst_num = 8 * 20; // ~ 50*4.5ms = 90ms?
+	static_assert(avgburst_num * 577 > (50 * 1000), "can't update faster then blade wait time?");
+	const unsigned int rx_max_cutoff = (rxFullScale * 2) / 3;
+	static int gain_check = 0;
+	static float runmean = 0;
+	float sum = 0;
+	for (auto i : brst.burst)
+		sum += abs(i.real()) + abs(i.imag());
+	sum /= ONE_TS_BURST_LEN * 2;
+
+	runmean = gain_check ? (runmean * (gain_check + 2) - 1 + sum) / (gain_check + 2) : sum;
+
+	if (gain_check == avgburst_num - 1) {
+		DBGLG2() << "\x1B[32m #RXG \033[0m" << rxgain << " " << runmean << " " << sum << std::endl;
+		auto gainoffset = runmean < (rxFullScale / 4 ? 4 : 2);
+		gainoffset = runmean < (rxFullScale / 2 ? 2 : 1);
+		float newgain = runmean < rx_max_cutoff ? rxgain + gainoffset : rxgain - gainoffset;
+		// FIXME: gian cutoff
+		if (newgain != rxgain && newgain <= 60)
+			std::thread([this, newgain] { setRxGain(newgain); }).detach();
+		runmean = 0;
+	}
+	gain_check = (gain_check + 1) % avgburst_num;
+}
+
+static unsigned char sch_demod_bits[148];
+
+bool ms_trx::handle_sch_or_nb()
+{
+	one_burst brst;
+	auto current_gsm_time = timekeeper.gsmtime();
+	auto is_sch = gsm_sch_check_fn(current_gsm_time.FN()) && current_gsm_time.TN() == 0;
+	auto is_fcch = gsm_fcch_check_fn(current_gsm_time.FN()) && current_gsm_time.TN() == 0;
+#pragma unused(is_fcch)
+
+	//either pass burst to upper layer for demod, OR pass demodded SCH to upper layer so we don't waste time processing it twice
+	brst.gsmts = current_gsm_time;
+
+	if (!is_sch) {
+		memcpy(brst.burst, burst_copy_buffer, sizeof(blade_sample_type) * ONE_TS_BURST_LEN);
+	} else {
+		handle_sch(false);
+		memcpy(brst.sch_bits, sch_demod_bits, sizeof(sch_demod_bits));
+	}
+	// auto pushok = rxqueue.spsc_push(&brst);
+#ifndef SYNCTHINGONLY
+	if (upper_is_ready) { // this is blocking, so only submit if there is a reader - only if upper exists!
+#endif
+		while (!rxqueue.spsc_push(&brst))
+			;
+#ifndef SYNCTHINGONLY
+	}
+#endif
+
+	// #ifdef PRINT_Q_OVERFLOW
+	// 	if (!pushok)
+	// 		std::cout << "F" << std::endl;
+	// #endif
+	if (do_auto_gain)
+		maybe_update_gain(brst);
+
+	return false;
+}
+
+static float sch_acq_buffer[SCH_LEN_SPS * 2];
+
+bool ms_trx::handle_sch(bool is_first_sch_acq)
+{
+	auto current_gsm_time = timekeeper.gsmtime();
+	const auto buf_len = is_first_sch_acq ? SCH_LEN_SPS : ONE_TS_BURST_LEN;
+	const auto which_in_buffer = is_first_sch_acq ? first_sch_buf : burst_copy_buffer;
+	const auto which_out_buffer = is_first_sch_acq ? sch_acq_buffer : &sch_acq_buffer[40 * 2];
+	const auto ss = reinterpret_cast<std::complex<float> *>(which_out_buffer);
+	std::complex<float> channel_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+
+	float max_corr = 0;
+	int start;
+	memset((void *)&sch_acq_buffer[0], 0, sizeof(sch_acq_buffer));
+	if (is_first_sch_acq) {
+		convert_and_scale<float, int16_t>(which_out_buffer, which_in_buffer, buf_len * 2,
+						  1.f / float(rxFullScale));
+		start = get_sch_buffer_chan_imp_resp(ss, &channel_imp_resp[0], buf_len, &max_corr);
+		detect_burst(&ss[start], &channel_imp_resp[0], 0, sch_demod_bits);
+	} else {
+		convert_and_scale<float, int16_t>(which_out_buffer, which_in_buffer, buf_len * 2,
+						  1.f / float(rxFullScale));
+		start = get_sch_chan_imp_resp(ss, &channel_imp_resp[0]);
+		start = start < 39 ? start : 39;
+		start = start > -39 ? start : -39;
+		detect_burst(&ss[start], &channel_imp_resp[0], 0, sch_demod_bits);
+	}
+
+	SoftVector bitss(148);
+	for (int i = 0; i < 148; i++) {
+		bitss[i] = (!sch_demod_bits[i]) < 1 ? -1 : 1;
+	}
+
+	auto sch_decode_success = decode_sch(bitss.begin(), is_first_sch_acq);
+
+	if (sch_decode_success) {
+		const auto ts_offset_symb = 0;
+		if (is_first_sch_acq) {
+			// update ts to first sample in sch buffer, to allow delay calc for current ts
+			first_sch_ts_start = first_sch_buf_rcv_ts + start - (ts_offset_symb * 4) - 1;
+		} else if (abs(start) > 1) {
+			// continuous sch tracking, only update if off too much
+			temp_ts_corr_offset += -start;
+			std::cerr << "offs: " << start << " " << temp_ts_corr_offset << std::endl;
+		}
+
+		return true;
+	} else {
+		DBGLG2() << "L SCH : \x1B[31m decode fail \033[0m @ toa:" << start << " " << current_gsm_time.FN()
+			 << ":" << current_gsm_time.TN() << std::endl;
+	}
+	return false;
+}
+
+__attribute__((xray_never_instrument)) SCH_STATE ms_trx::search_for_sch(dev_buf_t *rcd)
+{
+	static unsigned int sch_pos = 0;
+	if (sch_thread_done)
+		return SCH_STATE::FOUND;
+
+	if (rcv_done)
+		return SCH_STATE::SEARCHING;
+
+	auto to_copy = SCH_LEN_SPS - sch_pos;
+
+	if (SCH_LEN_SPS == to_copy) // first time
+		first_sch_buf_rcv_ts = rcd->get_first_ts();
+
+	if (!to_copy) {
+		sch_pos = 0;
+		rcv_done = true;
+		std::thread([this] {
+			set_name_aff_sched("sch_search", 1, SCHED_FIFO, sched_get_priority_max(SCHED_FIFO) - 5);
+
+			auto ptr = reinterpret_cast<const int16_t *>(first_sch_buf);
+			const auto target_val = rxFullScale / 8;
+			float sum = 0;
+			for (int i = 0; i < SCH_LEN_SPS * 2; i++)
+				sum += std::abs(ptr[i]);
+			sum /= SCH_LEN_SPS * 2;
+
+			//FIXME: arbitrary value, gain cutoff
+			if (sum > target_val || rxgain >= 60) // enough ?
+				sch_thread_done = this->handle_sch(true);
+			else {
+				std::cerr << "\x1B[32m #RXG \033[0m gain " << rxgain << " -> " << rxgain + 4
+					  << " sample avg:" << sum << " target: >=" << target_val << std::endl;
+				setRxGain(rxgain + 4);
+			}
+
+			if (!sch_thread_done)
+				rcv_done = false; // retry!
+			return (bool)sch_thread_done;
+		}).detach();
+	}
+
+	auto spsmax = rcd->actual_samples_per_buffer();
+	if (to_copy > spsmax)
+		sch_pos += rcd->readall(first_sch_buf + sch_pos);
+	else
+		sch_pos += rcd->read_n(first_sch_buf + sch_pos, 0, to_copy);
+
+	return SCH_STATE::SEARCHING;
+}
+__attribute__((optnone)) void ms_trx::grab_bursts(dev_buf_t *rcd)
+{
+	// partial burst samples read from the last buffer
+	static int partial_rdofs = 0;
+	static bool first_call = true;
+	int to_skip = 0;
+
+	// round up to next burst by calculating the time between sch detection and now
+	if (first_call) {
+		const auto next_burst_start = rcd->get_first_ts() - first_sch_ts_start;
+		const auto fullts = next_burst_start / ONE_TS_BURST_LEN;
+		const auto fracts = next_burst_start % ONE_TS_BURST_LEN;
+		to_skip = ONE_TS_BURST_LEN - fracts;
+
+		for (int i = 0; i < fullts; i++)
+			timekeeper.inc_and_update(first_sch_ts_start + i * ONE_TS_BURST_LEN);
+
+		if (fracts)
+			timekeeper.inc_both();
+		// timekeeper.inc_and_update(first_sch_ts_start + 1 * ONE_TS_BURST_LEN);
+
+		timekeeper.dec_by_one(); // oops, off by one?
+
+		timekeeper.set(timekeeper.gsmtime(), rcd->get_first_ts() - ONE_TS_BURST_LEN + to_skip);
+
+		DBGLG() << "this ts: " << rcd->get_first_ts() << " diff full TN: " << fullts << " frac TN: " << fracts
+			<< " GSM now: " << timekeeper.gsmtime().FN() << ":" << timekeeper.gsmtime().TN() << " is sch? "
+			<< gsm_sch_check_fn(timekeeper.gsmtime().FN()) << std::endl;
+		first_call = false;
+	}
+
+	if (partial_rdofs) {
+		auto first_remaining = ONE_TS_BURST_LEN - partial_rdofs;
+		// memcpy(burst_copy_buffer, partial_buf, partial_rdofs * sizeof(blade_sample_type));
+		auto rd = rcd->read_n(burst_copy_buffer + partial_rdofs, 0, first_remaining);
+		if (rd != first_remaining) {
+			partial_rdofs += rd;
+			return;
+		}
+
+		timekeeper.inc_and_update_safe(rcd->get_first_ts() - partial_rdofs);
+		handle_sch_or_nb();
+		to_skip = first_remaining;
+	}
+
+	// apply sample rate slippage compensation
+	to_skip -= temp_ts_corr_offset;
+
+	// FIXME: happens rarely, read_n start -1 blows up
+	// this is fine: will just be corrected one buffer later
+	if (to_skip < 0)
+		to_skip = 0;
+	else
+		temp_ts_corr_offset = 0;
+
+	const auto left_after_burst = rcd->actual_samples_per_buffer() - to_skip;
+
+	const int full = left_after_burst / ONE_TS_BURST_LEN;
+	const int frac = left_after_burst % ONE_TS_BURST_LEN;
+
+	for (int i = 0; i < full; i++) {
+		rcd->read_n(burst_copy_buffer, to_skip + i * ONE_TS_BURST_LEN, ONE_TS_BURST_LEN);
+		timekeeper.inc_and_update_safe(rcd->get_first_ts() + to_skip + i * ONE_TS_BURST_LEN);
+		handle_sch_or_nb();
+	}
+
+	if (frac)
+		rcd->read_n(burst_copy_buffer, to_skip + full * ONE_TS_BURST_LEN, frac);
+	partial_rdofs = frac;
+}

Transceiver52M/ms/ms_rx_upper.cpp

@@ -0,0 +1,397 @@
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "sigProcLib.h"
+#include "syncthing.h"
+#include "l1if.h"
+#include <signalVector.h>
+#include <radioVector.h>
+#include <radioInterface.h>
+#include "grgsm_vitac/grgsm_vitac.h"
+#include "ms_state.h"
+#include "ms_rx_upper.h"
+
+extern "C" {
+#include <osmocom/core/select.h>
+#include "sch.h"
+#include "convolve.h"
+#include "convert.h"
+#include "proto_trxd.h"
+
+void __lsan_do_recoverable_leak_check();
+}
+
+#ifdef LOG
+#undef LOG
+#define LOG(...) upper_trx::dummy_log()
+#endif
+
+void upper_trx::start_threads()
+{
+	thr_control = std::thread([this] {
+		set_name_aff_sched("upper_ctrl", 1, SCHED_RR, sched_get_priority_max(SCHED_RR));
+		while (1) {
+			driveControl();
+			pthread_testcancel();
+		}
+	});
+	msleep(1);
+	thr_tx = std::thread([this] {
+		set_name_aff_sched("upper_tx", 1, SCHED_FIFO, sched_get_priority_max(SCHED_FIFO) - 1);
+
+		while (1) {
+			driveTx();
+			pthread_testcancel();
+		}
+	});
+
+	// atomic ensures data is not written to q until loop reads
+	start_ms();
+
+	set_name_aff_sched("upper_rx", 1, SCHED_FIFO, sched_get_priority_max(SCHED_RR) - 5);
+	while (1) {
+		// set_upper_ready(true);
+		driveReceiveFIFO();
+		pthread_testcancel();
+		osmo_select_main(1);
+	}
+
+	// std::thread([this] {
+	// 	set_name_aff_sched("leakcheck", 1, SCHED_FIFO, sched_get_priority_max(SCHED_FIFO) - 10);
+
+	// 	while (1) {
+	// 		std::this_thread::sleep_for(std::chrono::seconds{ 5 });
+	// 		__lsan_do_recoverable_leak_check();
+	// 	}
+	// }).detach();
+}
+
+void upper_trx::start_ms()
+{
+	ms_trx::start();
+}
+
+/* Detect SCH synchronization sequence within a burst */
+bool upper_trx::detectSCH(ms_TransceiverState *state, signalVector &burst, struct estim_burst_params *ebp)
+{
+	int shift;
+	sch_detect_type full;
+	float mag, threshold = 4.0;
+
+	full = (state->mode == trx_mode::TRX_MODE_MS_TRACK) ? sch_detect_type::SCH_DETECT_NARROW :
+							      sch_detect_type::SCH_DETECT_FULL;
+
+	if (!detectSCHBurst(burst, threshold, rx_sps, full, ebp))
+		return false;
+
+	std::clog << "SCH : Timing offset     " << ebp->toa << " symbols" << std::endl;
+
+	mag = fabsf(ebp->toa);
+	if (mag < 1.0f)
+		return true;
+
+	shift = (int)(mag / 2.0f);
+	if (!shift)
+		shift++;
+
+	shift = ebp->toa > 0 ? shift : -shift;
+	std::clog << "SCH : shift ->     " << shift << " symbols" << std::endl;
+	// mRadioInterface->applyOffset(shift);
+	return false;
+}
+
+SoftVector *upper_trx::pullRadioVector(GSM::Time &wTime, int &RSSI, int &timingOffset) __attribute__((optnone))
+{
+	float pow, avg = 1.0;
+	static SoftVector bits(148);
+	static complex workbuf[40 + 625 + 40];
+	static signalVector sv(workbuf, 40, 625);
+
+	GSM::Time burst_time;
+	auto ss = reinterpret_cast<std::complex<float> *>(&workbuf[40]);
+
+	memset((void *)&workbuf[0], 0, sizeof(workbuf));
+	// assert(sv.begin() == &workbuf[40]);
+
+	one_burst e;
+	unsigned char outbin[148];
+
+	std::stringstream dbgout;
+
+	while (!rxqueue.spsc_pop(&e)) {
+		rxqueue.spsc_prep_pop();
+	}
+
+	burst_time = e.gsmts;
+	wTime = burst_time;
+
+	auto is_sch = (burst_time.TN() == 0 && gsm_sch_check_fn(burst_time.FN()));
+	auto is_fcch = (burst_time.TN() == 0 && gsm_fcch_check_fn(burst_time.FN()));
+
+	if (is_fcch) {
+		// return trash
+		// fprintf(stderr, "c %d\n",burst_time.FN());
+		return &bits;
+	}
+
+	if (is_sch) {
+		for (int i = 0; i < 148; i++)
+			(bits)[i] = (!e.sch_bits[i]) < 1 ? -1 : 1;
+		RSSI = 10;
+		timingOffset = 0;
+		// fprintf(stderr, "s %d\n", burst_time.FN());
+		return &bits;
+	}
+
+	CorrType type = TSC;
+
+	// tickle UL by returning null bursts if demod is skipped due to unused TS
+	switch (mStates.mode) {
+	case trx_mode::TRX_MODE_MS_TRACK:
+		if (mStates.chanType[burst_time.TN()] == ChannelCombination::NONE_INACTIVE) {
+			type = OFF;
+			goto release;
+		} else if (is_sch)
+			type = SCH;
+		else if (!is_fcch) // all ts0, but not fcch or sch..
+			type = TSC;
+		break;
+
+	case trx_mode::TRX_MODE_OFF:
+	default:
+		goto release;
+	}
+
+	convert_and_scale<float, int16_t>(ss, e.burst, ONE_TS_BURST_LEN * 2, 1.f / 2047.f);
+
+	pow = energyDetect(sv, 20 * rx_sps);
+	if (pow < -1) {
+		LOG(ALERT) << "Received empty burst";
+		goto release;
+	}
+
+	avg = sqrt(pow);
+
+	if (type == SCH) {
+		std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+		int d_c0_burst_start = get_sch_chan_imp_resp(ss, &chan_imp_resp[0]);
+		detect_burst(ss, &chan_imp_resp[0], d_c0_burst_start, outbin);
+
+		for (int i = 0; i < 148; i++)
+			(bits)[i] = (!outbin[i]) < 1 ? -1 : 1;
+
+		// auto rv = decode_sch(bits->begin(), false);
+		// dbgout << "U SCH@"
+		//        << " " << e.gsmts.FN() << ":" << e.gsmts.TN() << " " << d_c0_burst_start
+		//        << " DECODE:" << (rv ? "yes" : "---") << std::endl;
+
+		// std::cerr << dbgout.str();
+	} else {
+		float ncmax, dcmax;
+		std::complex<float> chan_imp_resp[CHAN_IMP_RESP_LENGTH * d_OSR];
+		std::complex<float> chan_imp_resp2[CHAN_IMP_RESP_LENGTH * d_OSR];
+		auto normal_burst_start = get_norm_chan_imp_resp(ss, &chan_imp_resp[0], &ncmax, mTSC);
+		auto dummy_burst_start = get_norm_chan_imp_resp(ss, &chan_imp_resp2[0], &dcmax, TS_DUMMY);
+		auto is_nb = ncmax > dcmax;
+
+		// std::cerr << " U " << (is_nb ? "NB" : "DB") << "@ o nb: " << normal_burst_start
+		// 	  << " o db: " << dummy_burst_start << std::endl;
+
+		normal_burst_start = normal_burst_start < 39 ? normal_burst_start : 39;
+		normal_burst_start = normal_burst_start > -39 ? normal_burst_start : -39;
+
+		// fprintf(stderr, "%s %d\n", (is_nb ? "N":"D"), burst_time.FN());
+		// if (is_nb)
+		detect_burst(ss, &chan_imp_resp[0], normal_burst_start, outbin);
+		// else
+		// 	detect_burst(ss, &chan_imp_resp2[0], dummy_burst_start, outbin);
+
+		for (int i = 0; i < 148; i++)
+			(bits)[i] = (outbin[i]) < 1 ? -1 : 1;
+	}
+
+	RSSI = (int)floor(20.0 * log10(rxFullScale / avg));
+	timingOffset = (int)round(0);
+
+	return &bits;
+
+release:
+	return NULL;
+}
+
+void upper_trx::driveReceiveFIFO()
+{
+	int RSSI;
+	int TOA; // in 1/256 of a symbol
+	GSM::Time burstTime;
+
+	if (!mOn)
+		return;
+
+	SoftVector *rxBurst = pullRadioVector(burstTime, RSSI, TOA);
+
+	trxd_from_trx response;
+	response.ts = burstTime.TN();
+	response.fn = htonl(burstTime.FN());
+	response.rssi = RSSI;
+	response.toa = htons(TOA);
+	if (rxBurst) {
+		SoftVector::const_iterator burstItr = rxBurst->begin();
+		if (burstTime.TN() == 0 && gsm_sch_check_fn(burstTime.FN())) {
+			clamp_array(rxBurst->begin(), 148, 1.5f);
+			for (unsigned int i = 0; i < gSlotLen; i++) {
+				auto val = *burstItr++;
+				auto vval = isnan(val) ? 0 : val;
+				((int8_t *)response.symbols)[i] = round((vval - 0.5) * 64.0);
+			}
+		} else {
+			// invert and fix to +-127 sbits
+			for (int i = 0; i < 148; i++)
+				((int8_t *)response.symbols)[i] = *burstItr++ > 0.0f ? -127 : 127;
+		}
+	}
+
+#ifdef IPCIF
+	push_d(response);
+#else
+	int rv = sendto(mDataSockets, &response, sizeof(trxd_from_trx), 0, (struct sockaddr *)&datadest,
+			sizeof(struct sockaddr_in));
+	if (rv < 0) {
+		std::cerr << "fuck, send?" << std::endl;
+		exit(0);
+	}
+
+#endif
+}
+
+void upper_trx::driveTx()
+{
+#ifdef IPCIF
+	auto burst = pop_d();
+	if (!burst) {
+		// std::cerr << "wtf no tx burst?" << std::endl;
+		// exit(0);
+		continue;
+	}
+#else
+	trxd_to_trx buffer;
+
+	socklen_t addr_len = sizeof(datasrc);
+	int rdln = recvfrom(mDataSockets, (void *)&buffer, sizeof(trxd_to_trx), 0, &datasrc, &addr_len);
+	if (rdln < 0 && errno == EAGAIN) {
+		std::cerr << "fuck, rcv?" << std::endl;
+		exit(0);
+	}
+	if(rdln < sizeof(buffer)) // nope ind has len 6 or something like that
+		return;
+
+
+	trxd_to_trx *burst = &buffer;
+#endif
+	auto proper_fn = ntohl(burst->fn);
+	// std::cerr << "got burst!" << proper_fn << ":" << burst->ts
+	// 	  << " current: " << timekeeper.gsmtime().FN()
+	// 	  << " dff: " << (int64_t)((int64_t)timekeeper.gsmtime().FN() - (int64_t)proper_fn)
+	// 	  << std::endl;
+
+	auto currTime = GSM::Time(proper_fn, burst->ts);
+	int RSSI = (int)burst->txlev;
+
+	static BitVector newBurst(gSlotLen);
+	BitVector::iterator itr = newBurst.begin();
+	auto *bufferItr = burst->symbols;
+	while (itr < newBurst.end())
+		*itr++ = *bufferItr++;
+
+	auto txburst = modulateBurst(newBurst, 8 + (currTime.TN() % 4 == 0), 4);
+	scaleVector(*txburst, txFullScale * 0.7 /* * pow(10, -RSSI / 10)*/);
+
+	// float -> int16
+	blade_sample_type burst_buf[txburst->size()];
+	convert_and_scale<int16_t, float>(burst_buf, txburst->begin(), txburst->size() * 2, 1);
+
+	// auto check = signalVector(txburst->size(), 40);
+	// convert_and_scale<float, int16_t, 1>(check.begin(), burst_buf, txburst->size() * 2);
+	// estim_burst_params ebp;
+	// auto d = detectAnyBurst(check, 2, 4, 4, CorrType::RACH, 40, &ebp);
+	// if(d)
+	// 	std::cerr << "RACH D! " << ebp.toa << std::endl;
+	// else
+	// 	std::cerr << "RACH NOOOOOOOOOO D! " << ebp.toa << std::endl;
+
+	// memory read --binary --outfile /tmp/mem.bin &burst_buf[0] --count 2500 --force
+
+	submit_burst(burst_buf, txburst->size(), currTime);
+	delete txburst;
+
+#ifdef IPCIF
+	free(burst);
+#endif
+}
+
+// __attribute__((xray_always_instrument)) static void *rx_stream_callback(struct bladerf *dev,
+// 									struct bladerf_stream *stream,
+// 									struct bladerf_metadata *meta, void *samples,
+// 									size_t num_samples, void *user_data)
+// {
+// 	struct ms_trx *trx = (struct ms_trx *)user_data;
+// 	return trx->rx_cb(dev, stream, meta, samples, num_samples, user_data);
+// }
+
+// __attribute__((xray_always_instrument)) static void *tx_stream_callback(struct bladerf *dev,
+// 									struct bladerf_stream *stream,
+// 									struct bladerf_metadata *meta, void *samples,
+// 									size_t num_samples, void *user_data)
+// {
+// 	struct ms_trx *trx = (struct ms_trx *)user_data;
+// 	return BLADERF_STREAM_NO_DATA;
+// }
+
+int trxc_main(int argc, char *argv[])
+{
+	pthread_setname_np(pthread_self(), "main_trxc");
+
+	convolve_init();
+	convert_init();
+	sigProcLibSetup();
+	initvita();
+
+	int status = 0;
+	auto trx = new upper_trx();
+	trx->do_auto_gain = true;
+
+	status = trx->init_dev_and_streams(0, 0);
+	trx->start_threads();
+
+	return status;
+}
+
+extern "C" volatile bool gshutdown = false;
+extern "C" void init_external_transceiver(int argc, char **argv)
+{
+	std::cout << "init?" << std::endl;
+	trxc_main(argc, argv);
+}
+
+extern "C" void stop_trx()
+{
+	std::cout << "Shutting down transceiver..." << std::endl;
+}

Transceiver52M/ms/ms_rx_upper.h

@@ -0,0 +1,121 @@
+
+#pragma once
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <netdb.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include "GSMCommon.h"
+#include "radioClock.h"
+#include "syncthing.h"
+#include "ms_state.h"
+
+class upper_trx : public ms_trx {
+	int rx_sps, tx_sps;
+
+	ms_TransceiverState mStates;
+
+	bool mOn; ///< flag to indicate that transceiver is powered on
+	double mTxFreq; ///< the transmit frequency
+	double mRxFreq; ///< the receive frequency
+	int mPower; ///< the transmit power in dB
+	unsigned mMaxExpectedDelay; ///< maximum TOA offset in GSM symbols
+	unsigned long long mRxSlotMask[8]; ///< MS - enabled multiframe slot mask
+
+	int mDataSockets;
+	sockaddr_in datadest;
+	sockaddr datasrc;
+	int mCtrlSockets;
+	sockaddr_in ctrldest;
+	sockaddr ctrlsrc;
+
+	void openudp(int *mSocketFD, unsigned short localPort, const char *wlocalIP)
+	{
+		*mSocketFD = socket(AF_INET, SOCK_DGRAM, 0);
+		int on = 1;
+		setsockopt(*mSocketFD, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+
+		struct sockaddr_in address;
+		size_t length = sizeof(address);
+		bzero(&address, length);
+		address.sin_family = AF_INET;
+		address.sin_addr.s_addr = inet_addr(wlocalIP);
+		address.sin_port = htons(localPort);
+		if (bind(*mSocketFD, (struct sockaddr *)&address, length) < 0) {
+			std::cerr << "bind fail!" << std::endl;
+			exit(0);
+		}
+	}
+
+	bool resolveAddress(struct sockaddr_in *address, const char *host, unsigned short port)
+	{
+		struct hostent *hp;
+		int h_errno_local;
+
+		struct hostent hostData;
+		char tmpBuffer[2048];
+
+		auto rc = gethostbyname2_r(host, AF_INET, &hostData, tmpBuffer, sizeof(tmpBuffer), &hp, &h_errno_local);
+		if (hp == NULL || hp->h_addrtype != AF_INET || rc != 0) {
+			std::cerr << "WARNING -- gethostbyname() failed for " << host << ", "
+				  << hstrerror(h_errno_local);
+			exit(0);
+			return false;
+		}
+
+		address->sin_family = hp->h_addrtype;
+		assert(sizeof(address->sin_addr) == hp->h_length);
+		memcpy(&(address->sin_addr), hp->h_addr_list[0], hp->h_length);
+		address->sin_port = htons(port);
+		return true;
+	}
+
+	void driveControl();
+	void driveReceiveFIFO();
+	void driveTx();
+	void commandhandler(char *buffer, char *response);
+	void writeClockInterface(){};
+
+	SoftVector *pullRadioVector(GSM::Time &wTime, int &RSSI, int &timingOffset);
+
+	bool detectSCH(ms_TransceiverState *state, signalVector &burst, struct estim_burst_params *ebp);
+
+	std::thread thr_control, thr_rx, thr_tx;
+
+    public:
+	void start_threads();
+	void start_ms();
+
+	upper_trx() : rx_sps(4), tx_sps(4)
+	{
+		auto c_srcport = 6700 + 2 * 0 + 1;
+		auto c_dstport = 6700 + 2 * 0 + 101;
+		auto d_srcport = 6700 + 2 * 0 + 2;
+		auto d_dstport = 6700 + 2 * 0 + 102;
+
+		openudp(&mCtrlSockets, c_srcport, "127.0.0.1");
+		openudp(&mDataSockets, d_srcport, "127.0.0.1");
+		resolveAddress(&ctrldest, "127.0.0.1", c_dstport);
+		resolveAddress(&datadest, "127.0.0.1", d_dstport);
+	};
+};

Transceiver52M/ms/ms_state.h

@@ -0,0 +1,175 @@
+#pragma once
+
+#include <radioVector.h>
+#include <signalVector.h>
+
+enum class trx_mode {
+	TRX_MODE_OFF,
+	TRX_MODE_BTS,
+	TRX_MODE_MS_ACQUIRE,
+	TRX_MODE_MS_TRACK,
+};
+
+enum class ChannelCombination {
+	FILL, ///< Channel is transmitted, but unused
+	I, ///< TCH/FS
+	II, ///< TCH/HS, idle every other slot
+	III, ///< TCH/HS
+	IV, ///< FCCH+SCH+CCCH+BCCH, uplink RACH
+	V, ///< FCCH+SCH+CCCH+BCCH+SDCCH/4+SACCH/4, uplink RACH+SDCCH/4
+	VI, ///< CCCH+BCCH, uplink RACH
+	VII, ///< SDCCH/8 + SACCH/8
+	VIII, ///< TCH/F + FACCH/F + SACCH/M
+	IX, ///< TCH/F + SACCH/M
+	X, ///< TCH/FD + SACCH/MD
+	XI, ///< PBCCH+PCCCH+PDTCH+PACCH+PTCCH
+	XII, ///< PCCCH+PDTCH+PACCH+PTCCH
+	XIII, ///< PDTCH+PACCH+PTCCH
+	NONE_INACTIVE, ///< Channel is inactive, default
+	LOOPBACK ///< similar go VII, used in loopback testing
+};
+
+struct ms_TransceiverState {
+	ms_TransceiverState() : mFreqOffsets(10), mode(trx_mode::TRX_MODE_OFF)
+	{
+		for (int i = 0; i < 8; i++) {
+			chanType[i] = ChannelCombination::NONE_INACTIVE;
+			fillerModulus[i] = 26;
+
+			for (int n = 0; n < 102; n++)
+				fillerTable[n][i] = nullptr;
+		}
+	}
+
+	~ms_TransceiverState()
+	{
+		for (int i = 0; i < 8; i++) {
+			for (int n = 0; n < 102; n++)
+				delete fillerTable[n][i];
+		}
+	}
+
+	void setModulus(size_t timeslot)
+	{
+		switch (chanType[timeslot]) {
+		case ChannelCombination::NONE_INACTIVE:
+		case ChannelCombination::I:
+		case ChannelCombination::II:
+		case ChannelCombination::III:
+		case ChannelCombination::FILL:
+			fillerModulus[timeslot] = 26;
+			break;
+		case ChannelCombination::IV:
+		case ChannelCombination::VI:
+		case ChannelCombination::V:
+			fillerModulus[timeslot] = 51;
+			break;
+			//case V:
+		case ChannelCombination::VII:
+			fillerModulus[timeslot] = 102;
+			break;
+		case ChannelCombination::XIII:
+			fillerModulus[timeslot] = 52;
+			break;
+		default:
+			break;
+		}
+	}
+
+	CorrType expectedCorrType(GSM::Time currTime, unsigned long long *mRxSlotMask)
+	{
+		unsigned burstTN = currTime.TN();
+		unsigned burstFN = currTime.FN();
+
+		if (mode == trx_mode::TRX_MODE_MS_TRACK) {
+			/* 102 modulus case currently unhandled */
+			if (fillerModulus[burstTN] > 52)
+				return OFF;
+
+			int modFN = burstFN % fillerModulus[burstTN];
+			unsigned long long reg = (unsigned long long)1 << modFN;
+			if (reg & mRxSlotMask[burstTN])
+				return TSC;
+			else
+				return OFF;
+		}
+
+		switch (chanType[burstTN]) {
+		case ChannelCombination::NONE_INACTIVE:
+			return OFF;
+			break;
+		case ChannelCombination::FILL:
+			return IDLE;
+			break;
+		case ChannelCombination::I:
+			return TSC;
+			/*if (burstFN % 26 == 25) 
+      return IDLE;
+    else
+      return TSC;*/
+			break;
+		case ChannelCombination::II:
+			return TSC;
+			break;
+		case ChannelCombination::III:
+			return TSC;
+			break;
+		case ChannelCombination::IV:
+		case ChannelCombination::VI:
+			return RACH;
+			break;
+		case ChannelCombination::V: {
+			int mod51 = burstFN % 51;
+			if ((mod51 <= 36) && (mod51 >= 14))
+				return RACH;
+			else if ((mod51 == 4) || (mod51 == 5))
+				return RACH;
+			else if ((mod51 == 45) || (mod51 == 46))
+				return RACH;
+			else
+				return TSC;
+			break;
+		}
+		case ChannelCombination::VII:
+			if ((burstFN % 51 <= 14) && (burstFN % 51 >= 12))
+				return IDLE;
+			else
+				return TSC;
+			break;
+		case ChannelCombination::XIII: {
+			int mod52 = burstFN % 52;
+			if ((mod52 == 12) || (mod52 == 38))
+				return RACH;
+			else if ((mod52 == 25) || (mod52 == 51))
+				return IDLE;
+			else
+				return TSC;
+			break;
+		}
+		case ChannelCombination::LOOPBACK:
+			if ((burstFN % 51 <= 50) && (burstFN % 51 >= 48))
+				return IDLE;
+			else
+				return TSC;
+			break;
+		default:
+			return OFF;
+			break;
+		}
+	}
+
+	/* Initialize a multiframe slot in the filler table */
+	void init(size_t slot, signalVector *burst, bool fill);
+
+	ChannelCombination chanType[8];
+
+	/* The filler table */
+	signalVector *fillerTable[102][8];
+	int fillerModulus[8];
+
+	/* Received noise energy levels */
+	avgVector mFreqOffsets;
+
+	/* Transceiver mode */
+	trx_mode mode;
+};

Transceiver52M/ms/syncthing.cpp

@@ -0,0 +1,337 @@
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include "GSMCommon.h"
+#include <atomic>
+#include <cassert>
+#include <complex>
+#include <iostream>
+#include <cstdlib>
+#include <cstdio>
+#include <thread>
+#include <fstream>
+
+#include "sigProcLib.h"
+
+#include "syncthing.h"
+#include "ms_rx_burst.h"
+#include "grgsm_vitac/grgsm_vitac.h"
+
+extern "C" {
+#include "sch.h"
+#include "convolve.h"
+#include "convert.h"
+}
+
+dummylog ms_trx::dummy_log;
+
+const int offset_start = -15;
+int offsetrange = 200;
+static int offset_ctr = 0;
+
+void tx_test(ms_trx *t, ts_hitter_q_t *q, unsigned int *tsc)
+{
+	sched_param sch_params;
+	sch_params.sched_priority = sched_get_priority_max(SCHED_FIFO);
+	pthread_setschedparam(pthread_self(), SCHED_FIFO, &sch_params);
+
+	auto burst = genRandAccessBurst(0, 4, 0);
+	scaleVector(*burst, t->txFullScale * 0.7);
+
+	// float -> int16
+	blade_sample_type burst_buf[burst->size()];
+	convert_and_scale<int16_t, float>(burst_buf, burst->begin(), burst->size() * 2, 1);
+
+	while (1) {
+		GSM::Time target;
+		while (!q->spsc_pop(&target)) {
+			q->spsc_prep_pop();
+		}
+
+		std::cerr << std::endl << "\x1B[32m hitting " << target.FN() << "\033[0m" << std::endl;
+
+		int timing_advance = 0;
+		int64_t now_ts;
+		GSM::Time now_time;
+		target.incTN(3); // ul dl offset
+		int target_fn = target.FN();
+		int target_tn = target.TN();
+		t->timekeeper.get_both(&now_time, &now_ts);
+
+		auto diff_fn = GSM::FNDelta(target_fn, now_time.FN());
+		int diff_tn = (target_tn - (int)now_time.TN()) % 8;
+		auto tosend = GSM::Time(diff_fn, 0);
+
+		if (diff_tn > 0)
+			tosend.incTN(diff_tn);
+		else if (diff_tn < 0)
+			tosend.decTN(-diff_tn);
+
+		// in thory fn equal and tn+3 equal is also a problem...
+		if (diff_fn < 0 || (diff_fn == 0 && (now_time.TN() - target_tn < 1))) {
+			std::cerr << "## TX too late?! fn DIFF:" << diff_fn << " tn LOCAL: " << now_time.TN()
+				  << " tn OTHER: " << target_tn << std::endl;
+			return;
+		}
+
+		auto check = now_time + tosend;
+		int64_t send_ts =
+			now_ts + tosend.FN() * 8 * ONE_TS_BURST_LEN + tosend.TN() * ONE_TS_BURST_LEN - timing_advance;
+
+		// std::cerr << "## fn DIFF: " << diff_fn << " ## tn DIFF: " << diff_tn
+		// 			<< " tn LOCAL: " << now_time.TN() << " tn OTHER: " << target_tn
+		// 			<< " tndiff" << diff_tn << " tosend:" << tosend.FN() << ":" << tosend.TN()
+		// 			<< " calc: " << check.FN() << ":" <<check.TN()
+		// 			<< " target: " << target.FN() << ":" <<target.TN()
+		// 			<< " ts now: " << now_ts << " target ts:" << send_ts << std::endl;
+
+		unsigned int pad = 4 * 25;
+		blade_sample_type buf2[burst->size() + pad];
+		memset(buf2, 0, pad * sizeof(blade_sample_type));
+		memcpy(&buf2[pad], burst_buf, burst->size() * sizeof(blade_sample_type));
+
+		assert(target.FN() == check.FN());
+		assert(target.TN() == check.TN());
+		assert(target.FN() % 51 == 21);
+
+		// auto this_offset = offset_start + (offset_ctr++ % offsetrange);
+		// std::cerr << "-- O " << this_offset << std::endl;
+		// send_ts = now_ts + ((target.FN() * 8 + (int)target.TN()) - (now_time.FN() * 8 + (int)now_time.TN())) * ONE_TS_BURST_LEN - timing_advance;
+
+		t->submit_burst_ts(buf2, burst->size() + pad, send_ts - pad);
+
+		// signalVector test(burst->size() + pad);
+		// convert_and_scale<float, int16_t>(test.begin(), buf2, burst->size() * 2 + pad, 1.f / 2047.f);
+		// estim_burst_params ebp;
+		// auto det = detectAnyBurst(test, 0, 4, 4, CorrType::RACH, 40, &ebp);
+		// if (det > 0)
+		// 	std::cerr << "## Y " << ebp.toa << std::endl;
+		// else
+		// 	std::cerr << "## NOOOOOOOOO " << ebp.toa << std::endl;
+	}
+}
+#ifdef SYNCTHINGONLY
+template <typename A> auto parsec(std::vector<std::string> &v, A &itr, std::string arg, bool *rv)
+{
+	if (*itr == arg) {
+		*rv = true;
+		return true;
+	}
+	return false;
+}
+
+template <typename A, typename B, typename C>
+bool parsec(std::vector<std::string> &v, A &itr, std::string arg, B f, C *rv)
+{
+	if (*itr == arg) {
+		itr++;
+		if (itr != v.end()) {
+			*rv = f(itr->c_str());
+			return true;
+		}
+	}
+	return false;
+}
+template <typename A> bool parsec(std::vector<std::string> &v, A &itr, std::string arg, int scale, int *rv)
+{
+	return parsec(
+		v, itr, arg, [scale](const char *v) -> auto{ return atoi(v) * scale; }, rv);
+}
+template <typename A> bool parsec(std::vector<std::string> &v, A &itr, std::string arg, int scale, unsigned int *rv)
+{
+	return parsec(
+		v, itr, arg, [scale](const char *v) -> auto{ return atoi(v) * scale; }, rv);
+}
+
+int main(int argc, char *argv[])
+{
+	cpu_set_t cpuset;
+
+	CPU_ZERO(&cpuset);
+	CPU_SET(2, &cpuset);
+
+	auto rv = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+	if (rv < 0) {
+		std::cerr << "affinity: errreur! " << std::strerror(errno);
+		return 0;
+	}
+
+	unsigned int default_tx_freq(881000 * 1000), default_rx_freq(926000 * 1000);
+	unsigned int grx = 20, gtx = 20;
+	bool tx_flag = false;
+	pthread_setname_np(pthread_self(), "main");
+	convolve_init();
+	convert_init();
+	sigProcLibSetup();
+	initvita();
+
+	int status = 0;
+	auto trx = new ms_trx();
+	trx->do_auto_gain = true;
+
+	std::vector<std::string> args(argv + 1, argv + argc);
+	for (auto i = args.begin(); i != args.end(); ++i) {
+		parsec(args, i, "-r", 1000, &default_rx_freq);
+		parsec(args, i, "-t", 1000, &default_tx_freq);
+		parsec(args, i, "-gr", 1, &grx);
+		parsec(args, i, "-gt", 1, &gtx);
+		parsec(args, i, "-tx", &tx_flag);
+	}
+
+	std::cerr << "usage: " << argv[0] << " <rxfreq in khz, i.e. 926000> [txfreq in khz, i.e. 881000] [TX]"
+		  << std::endl
+		  << "rx" << (argc == 1 ? " (default) " : " ") << default_rx_freq << "hz, tx " << default_tx_freq
+		  << "hz" << std::endl
+		  << "gain rx " << grx << " gain tx " << gtx << std::endl
+		  << (tx_flag ? "##!!## RACH TX ACTIVE ##!!##" : "-- no rach tx --") << std::endl;
+
+	status = trx->init_dev_and_streams(0, 0);
+	if (status < 0)
+		return status;
+	trx->tuneRx(default_rx_freq);
+	trx->tuneTx(default_tx_freq);
+	trx->setRxGain(grx);
+	trx->setTxGain(gtx);
+
+	if (status == 0) {
+		// FIXME: hacks! needs exit flag for detached threads!
+
+		std::thread(rcv_bursts_test, &trx->rxqueue, &trx->mTSC).detach();
+		if (tx_flag)
+			std::thread(tx_test, trx, &trx->ts_hitter_q, &trx->mTSC).detach();
+		trx->start();
+		do {
+			sleep(1);
+		} while (1);
+
+		trx->stop_threads();
+	}
+	delete trx;
+
+	return status;
+}
+#endif
+
+int ms_trx::init_streams(void *rx_cb, void *tx_cb)
+{
+	return 0;
+}
+
+int ms_trx::init_dev_and_streams(void *rx_cb, void *tx_cb)
+{
+	int status = 0;
+	status = base::init_device(rx_bh(), tx_bh());
+	if (status < 0) {
+		std::cerr << "failed to init dev!" << std::endl;
+		return -1;
+	}
+	return status;
+}
+
+bh_fn_t ms_trx::rx_bh()
+{
+	return [this](dev_buf_t *rcd) -> int {
+		if (this->search_for_sch(rcd) == SCH_STATE::FOUND)
+			this->grab_bursts(rcd);
+		return 0;
+	};
+}
+
+bh_fn_t ms_trx::tx_bh()
+{
+	return [this](dev_buf_t *rcd) -> int {
+#pragma unused(rcd)
+		auto y = this;
+#pragma unused(y)
+		/* nothing to do here */
+		return 0;
+	};
+}
+
+void ms_trx::start()
+{
+	auto fn = get_rx_burst_handler_fn(rx_bh());
+	rx_task = std::thread(fn);
+
+	usleep(1000);
+	auto fn2 = get_tx_burst_handler_fn(tx_bh());
+	tx_task = std::thread(fn2);
+}
+
+void ms_trx::set_upper_ready(bool is_ready)
+{
+	upper_is_ready = is_ready;
+}
+
+void ms_trx::stop_threads()
+{
+	std::cerr << "killing threads...\r\n" << std::endl;
+	rx_task.join();
+}
+
+void ms_trx::submit_burst(blade_sample_type *buffer, int len, GSM::Time target)
+{
+	int64_t now_ts;
+	GSM::Time now_time;
+	target.incTN(3); // ul dl offset
+	int target_fn = target.FN();
+	int target_tn = target.TN();
+	timekeeper.get_both(&now_time, &now_ts);
+
+	auto diff_fn = GSM::FNDelta(target_fn, now_time.FN());
+	int diff_tn = (target_tn - (int)now_time.TN()) % 8;
+	auto tosend = GSM::Time(diff_fn, 0);
+
+	if (diff_tn > 0)
+		tosend.incTN(diff_tn);
+	else
+		tosend.decTN(-diff_tn);
+
+	// in thory fn equal and tn+3 equal is also a problem...
+	if (diff_fn < 0 || (diff_fn == 0 && (now_time.TN() - target_tn < 1))) {
+		std::cerr << "## TX too late?! fn DIFF:" << diff_fn << " tn LOCAL: " << now_time.TN()
+			  << " tn OTHER: " << target_tn << std::endl;
+		return;
+	}
+
+	auto check = now_time + tosend;
+	int64_t send_ts = now_ts + tosend.FN() * 8 * ONE_TS_BURST_LEN + tosend.TN() * ONE_TS_BURST_LEN - timing_advance;
+
+	// std::cerr << "## fn DIFF: " << diff_fn << " ## tn DIFF: " << diff_tn
+	// 			<< " tn LOCAL/OTHER: " << now_time.TN() << "/" << target_tn
+	// 			<< " tndiff" << diff_tn << " tosend:" << tosend.FN() << ":" << tosend.TN()
+	// 			<< " check: " << check.FN() << ":" <<check.TN()
+	// 			<< " target: " << target.FN() << ":" <<target.TN()
+	// 			<< " ts now: " << now_ts << " target ts:" << send_ts << std::endl;
+
+#if 1
+	unsigned int pad = 4 * 4;
+	blade_sample_type buf2[len + pad];
+	memset(buf2, 0, pad * sizeof(blade_sample_type));
+	memcpy(&buf2[pad], buffer, len * sizeof(blade_sample_type));
+
+	assert(target.FN() == check.FN());
+	assert(target.TN() == check.TN());
+	submit_burst_ts(buf2, len + pad, send_ts - pad);
+#else
+	submit_burst_ts(buffer, len, send_ts);
+#endif
+}

Transceiver52M/ms/syncthing.h

@@ -0,0 +1,235 @@
+#pragma once
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <atomic>
+#include <cassert>
+#include <complex>
+#include <cstdint>
+#include <mutex>
+#include <iostream>
+#include <thread>
+
+#if defined(BUILDBLADE)
+#include "bladerf_specific.h"
+#define BASET blade_hw<ms_trx>
+#elif defined(BUILDUHD)
+#include "uhd_specific.h"
+#define BASET uhd_hw<ms_trx>
+#elif defined(BUILDIPC)
+#include "ipc_specific.h"
+#define BASET ipc_hw<ms_trx>
+#else
+#error wat? no device..
+#endif
+
+#include "GSMCommon.h"
+#include "itrq.h"
+
+const unsigned int ONE_TS_BURST_LEN = (3 + 58 + 26 + 58 + 3 + 8.25) * 4 /*sps*/;
+const unsigned int NUM_RXQ_FRAMES = 1; // rx thread <-> upper rx queue
+const unsigned int SCH_LEN_SPS = (ONE_TS_BURST_LEN * 8 /*ts*/ * 12 /*frames*/);
+
+template <typename T> void clamp_array(T *start2, unsigned int len, T max)
+{
+	for (int i = 0; i < len; i++) {
+		const T t1 = start2[i] < -max ? -max : start2[i];
+		const T t2 = t1 > max ? max : t1;
+		start2[i] = t2;
+	}
+}
+template <typename DST_T, typename SRC_T, typename ST>
+void convert_and_scale(void *dst, void *src, unsigned int src_len, ST scale)
+{
+	for (unsigned int i = 0; i < src_len; i++)
+		reinterpret_cast<DST_T *>(dst)[i] = static_cast<DST_T>((reinterpret_cast<SRC_T *>(src)[i])) * scale;
+}
+template <typename DST_T, typename SRC_T> void convert_and_scale_default(void *dst, void *src, unsigned int src_len)
+{
+	return convert_and_scale<DST_T, SRC_T>(dst, src, src_len, SAMPLE_SCALE_FACTOR);
+}
+
+struct one_burst {
+	one_burst()
+	{
+	}
+	GSM::Time gsmts;
+	union {
+		blade_sample_type burst[ONE_TS_BURST_LEN];
+		unsigned char sch_bits[148];
+	};
+};
+
+using rx_queue_t = spsc_cond<8 * NUM_RXQ_FRAMES, one_burst, true, true>;
+
+enum class SCH_STATE { SEARCHING, FOUND };
+
+class dummylog : private std::streambuf {
+	std::ostream null_stream;
+
+    public:
+	dummylog() : null_stream(this){};
+	~dummylog() override{};
+	std::ostream &operator()()
+	{
+		return null_stream;
+	}
+	int overflow(int c) override
+	{
+		return c;
+	}
+};
+
+// keeps relationship between gsm time and (continuously adjusted) ts
+class time_keeper {
+	GSM::Time global_time_keeper;
+	int64_t global_ts_keeper;
+	std::mutex m;
+
+    public:
+	time_keeper() : global_time_keeper(0), global_ts_keeper(0)
+	{
+	}
+
+	void set(GSM::Time t, int64_t ts)
+	{
+		std::lock_guard<std::mutex> g(m);
+		global_time_keeper = t;
+		global_ts_keeper = ts;
+	}
+	void inc_both()
+	{
+		std::lock_guard<std::mutex> g(m);
+		global_time_keeper.incTN(1);
+		global_ts_keeper += ONE_TS_BURST_LEN;
+	}
+	void inc_and_update(int64_t new_ts)
+	{
+		std::lock_guard<std::mutex> g(m);
+		global_time_keeper.incTN(1);
+		global_ts_keeper = new_ts;
+		// std::cerr << "u " << new_ts << std::endl;
+	}
+	void inc_and_update_safe(int64_t new_ts)
+	{
+		std::lock_guard<std::mutex> g(m);
+		auto diff = new_ts - global_ts_keeper;
+		assert(diff < 1.5 * ONE_TS_BURST_LEN);
+		assert(diff > 0.5 * ONE_TS_BURST_LEN);
+		global_time_keeper.incTN(1);
+		global_ts_keeper = new_ts;
+		// std::cerr << "s " << new_ts << std::endl;
+	}
+	void dec_by_one()
+	{
+		std::lock_guard<std::mutex> g(m);
+		global_time_keeper.decTN(1);
+		global_ts_keeper -= ONE_TS_BURST_LEN;
+	}
+	auto get_ts()
+	{
+		std::lock_guard<std::mutex> g(m);
+		return global_ts_keeper;
+	}
+	auto gsmtime()
+	{
+		std::lock_guard<std::mutex> g(m);
+		return global_time_keeper;
+	}
+	void get_both(GSM::Time *t, int64_t *ts)
+	{
+		std::lock_guard<std::mutex> g(m);
+		*t = global_time_keeper;
+		*ts = global_ts_keeper;
+	}
+};
+
+using ts_hitter_q_t = spsc_cond<64, GSM::Time, true, false>;
+
+struct ms_trx : public BASET {
+	using base = BASET;
+	static dummylog dummy_log;
+	unsigned int mTSC;
+	unsigned int mBSIC;
+	int timing_advance;
+	bool do_auto_gain;
+
+	std::thread rx_task;
+	std::thread tx_task;
+	std::thread *calcrval_task;
+
+	// provides bursts to upper rx thread
+	rx_queue_t rxqueue;
+#ifdef SYNCTHINGONLY
+	ts_hitter_q_t ts_hitter_q;
+#endif
+	blade_sample_type *first_sch_buf;
+	blade_sample_type *burst_copy_buffer;
+
+	uint64_t first_sch_buf_rcv_ts;
+	std::atomic<bool> rcv_done;
+	std::atomic<bool> sch_thread_done;
+
+	int64_t temp_ts_corr_offset = 0;
+	int64_t first_sch_ts_start = -1;
+
+	time_keeper timekeeper;
+
+	void start();
+	std::atomic<bool> upper_is_ready;
+	void set_upper_ready(bool is_ready);
+
+	bool handle_sch_or_nb();
+	bool handle_sch(bool first = false);
+	bool decode_sch(float *bits, bool update_global_clock);
+	SCH_STATE search_for_sch(dev_buf_t *rcd);
+	void grab_bursts(dev_buf_t *rcd);
+
+	int init_device();
+	int init_streams(void *rx_cb, void *tx_cb);
+	int init_dev_and_streams(void *rx_cb, void *tx_cb);
+	void stop_threads();
+	void *rx_cb(ms_trx *t);
+	void *tx_cb();
+	void maybe_update_gain(one_burst &brst);
+
+	ms_trx()
+		: timing_advance(0), do_auto_gain(false), rxqueue(), first_sch_buf(new blade_sample_type[SCH_LEN_SPS]),
+		  burst_copy_buffer(new blade_sample_type[ONE_TS_BURST_LEN]), rcv_done{ false }, sch_thread_done{ false }
+	{
+	}
+
+	virtual ~ms_trx()
+	{
+		delete[] burst_copy_buffer;
+		delete[] first_sch_buf;
+	}
+	bh_fn_t rx_bh();
+	bh_fn_t tx_bh();
+
+	void submit_burst(blade_sample_type *buffer, int len, GSM::Time);
+	void set_ta(int val)
+	{
+		assert(val > -127 && val < 128);
+		timing_advance = val * 4;
+	}
+};

Transceiver52M/ms/uhd_specific.h

@@ -0,0 +1,274 @@
+#pragma once
+
+/*
+ * (C) 2022 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <uhd/version.hpp>
+#include <uhd/usrp/multi_usrp.hpp>
+#include <uhd/types/metadata.hpp>
+#include <complex>
+#include <cstring>
+#include <iostream>
+#include <thread>
+
+#include <Timeval.h>
+#include <vector>
+
+using blade_sample_type = std::complex<int16_t>;
+const int SAMPLE_SCALE_FACTOR = 1;
+
+struct uhd_buf_wrap {
+	double rxticks;
+	size_t num_samps;
+	uhd::rx_metadata_t *md;
+	blade_sample_type *buf;
+	auto actual_samples_per_buffer()
+	{
+		return num_samps;
+	}
+	long get_first_ts()
+	{
+		return md->time_spec.to_ticks(rxticks);
+	}
+	int readall(blade_sample_type *outaddr)
+	{
+		memcpy(outaddr, buf, num_samps * sizeof(blade_sample_type));
+		return num_samps;
+	}
+	int read_n(blade_sample_type *outaddr, int start, int num)
+	{
+		assert(start >= 0);
+		auto to_read = std::min((int)num_samps - start, num);
+		assert(to_read >= 0);
+		memcpy(outaddr, buf + start, to_read * sizeof(blade_sample_type));
+		return to_read;
+	}
+};
+
+using dev_buf_t = uhd_buf_wrap;
+using bh_fn_t = std::function<int(dev_buf_t *)>;
+
+template <typename T> struct uhd_hw {
+	uhd::usrp::multi_usrp::sptr dev;
+	uhd::rx_streamer::sptr rx_stream;
+	uhd::tx_streamer::sptr tx_stream;
+	blade_sample_type *one_pkt_buf;
+	std::vector<blade_sample_type *> pkt_ptrs;
+	size_t rx_spp;
+	double rxticks;
+	const unsigned int rxFullScale, txFullScale;
+	const int rxtxdelay;
+	float rxgain, txgain;
+
+	virtual ~uhd_hw()
+	{
+		delete[] one_pkt_buf;
+	}
+	uhd_hw() : rxFullScale(32767), txFullScale(32767), rxtxdelay(-67)
+	{
+	}
+
+	bool tuneTx(double freq, size_t chan = 0)
+	{
+		msleep(25);
+		dev->set_tx_freq(freq, chan);
+		msleep(25);
+		return true;
+	};
+	bool tuneRx(double freq, size_t chan = 0)
+	{
+		msleep(25);
+		dev->set_rx_freq(freq, chan);
+		msleep(25);
+		return true;
+	};
+	bool tuneRxOffset(double offset, size_t chan = 0)
+	{
+		return true;
+	};
+
+	double setRxGain(double dB, size_t chan = 0)
+	{
+		rxgain = dB;
+		msleep(25);
+		dev->set_rx_gain(dB, chan);
+		msleep(25);
+		return dB;
+	};
+	double setTxGain(double dB, size_t chan = 0)
+	{
+		txgain = dB;
+		msleep(25);
+		dev->set_tx_gain(dB, chan);
+		msleep(25);
+		return dB;
+	};
+	int setPowerAttenuation(int atten, size_t chan = 0)
+	{
+		return atten;
+	};
+
+	int init_device(bh_fn_t rxh, bh_fn_t txh)
+	{
+		auto const lock_delay_ms = 500;
+		auto const mcr = 26e6;
+		auto const rate = (1625e3 / 6) * 4;
+		auto const ref = "external";
+		auto const gain = 35;
+		auto const freq = 931.4e6; // 936.8e6
+		auto bw = 0.5e6;
+		auto const channel = 0;
+		std::string args = {};
+
+		dev = uhd::usrp::multi_usrp::make(args);
+		std::cout << "Using Device: " << dev->get_pp_string() << std::endl;
+		dev->set_clock_source(ref);
+		dev->set_master_clock_rate(mcr);
+		dev->set_rx_rate(rate, channel);
+		dev->set_tx_rate(rate, channel);
+		uhd::tune_request_t tune_request(freq, 0);
+		dev->set_rx_freq(tune_request, channel);
+		dev->set_rx_gain(gain, channel);
+		dev->set_tx_gain(60, channel);
+		dev->set_rx_bandwidth(bw, channel);
+		dev->set_tx_bandwidth(bw, channel);
+
+		while (!(dev->get_rx_sensor("lo_locked", channel).to_bool() &&
+			 dev->get_mboard_sensor("ref_locked").to_bool()))
+			std::this_thread::sleep_for(std::chrono::milliseconds(lock_delay_ms));
+
+		uhd::stream_args_t stream_args("sc16", "sc16");
+		rx_stream = dev->get_rx_stream(stream_args);
+		uhd::stream_args_t stream_args2("sc16", "sc16");
+		tx_stream = dev->get_tx_stream(stream_args2);
+
+		rx_spp = rx_stream->get_max_num_samps();
+		rxticks = dev->get_rx_rate();
+		assert(rxticks == dev->get_tx_rate());
+		one_pkt_buf = new blade_sample_type[rx_spp];
+		pkt_ptrs = { 1, &one_pkt_buf[0] };
+		return 0;
+	}
+
+	void *rx_cb(bh_fn_t burst_handler)
+	{
+		void *ret;
+		static int to_skip = 0;
+
+		uhd::rx_metadata_t md;
+		auto num_rx_samps = rx_stream->recv(pkt_ptrs.front(), rx_spp, md, 3.0, true);
+
+		if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) {
+			std::cerr << boost::format("Timeout while streaming") << std::endl;
+			exit(0);
+		}
+		if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_OVERFLOW) {
+			std::cerr << boost::format("Got an overflow indication. Please consider the following:\n"
+						   "  Your write medium must sustain a rate of %fMB/s.\n"
+						   "  Dropped samples will not be written to the file.\n"
+						   "  Please modify this example for your purposes.\n"
+						   "  This message will not appear again.\n") %
+					     1.f;
+			exit(0);
+			;
+		}
+		if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE) {
+			std::cerr << str(boost::format("Receiver error: %s") % md.strerror());
+			exit(0);
+		}
+
+		dev_buf_t rcd = { rxticks, num_rx_samps, &md, &one_pkt_buf[0] };
+
+		if (to_skip < 120) // prevents weird overflows on startup
+			to_skip++;
+		else {
+			burst_handler(&rcd);
+		}
+
+		return ret;
+	}
+
+	auto get_rx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [this, burst_handler] {
+			pthread_setname_np(pthread_self(), "rxrun");
+
+			uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
+			stream_cmd.stream_now = true;
+			stream_cmd.time_spec = uhd::time_spec_t();
+			rx_stream->issue_stream_cmd(stream_cmd);
+
+			while (1) {
+				rx_cb(burst_handler);
+			}
+		};
+		return fn;
+	}
+	auto get_tx_burst_handler_fn(bh_fn_t burst_handler)
+	{
+		auto fn = [] {
+			// dummy
+		};
+		return fn;
+	}
+	void submit_burst_ts(blade_sample_type *buffer, int len, uint64_t ts)
+	{
+		uhd::tx_metadata_t m = {};
+		m.end_of_burst = true;
+		m.start_of_burst = true;
+		m.has_time_spec = true;
+		m.time_spec = m.time_spec.from_ticks(ts + rxtxdelay, rxticks); // uhd specific b210 delay!
+		std::vector<void *> ptrs(1, buffer);
+
+		tx_stream->send(ptrs, len, m);
+
+		uhd::async_metadata_t async_md;
+		bool tx_ack = false;
+		while (!tx_ack && tx_stream->recv_async_msg(async_md)) {
+			tx_ack = (async_md.event_code == uhd::async_metadata_t::EVENT_CODE_BURST_ACK);
+		}
+		std::cout << (tx_ack ? "yay" : "nay") << " " << async_md.time_spec.to_ticks(rxticks) << std::endl;
+	}
+
+	void set_name_aff_sched(const char *name, int cpunum, int schedtype, int prio)
+	{
+		pthread_setname_np(pthread_self(), name);
+
+		cpu_set_t cpuset;
+
+		CPU_ZERO(&cpuset);
+		CPU_SET(cpunum, &cpuset);
+
+		auto rv = pthread_setaffinity_np(pthread_self(), sizeof(cpuset), &cpuset);
+		if (rv < 0) {
+			std::cerr << name << " affinity: errreur! " << std::strerror(errno);
+			return exit(0);
+		}
+
+		sched_param sch_params;
+		sch_params.sched_priority = prio;
+		rv = pthread_setschedparam(pthread_self(), schedtype, &sch_params);
+		if (rv < 0) {
+			std::cerr << name << " sched: errreur! " << std::strerror(errno);
+			return exit(0);
+		}
+	}
+};

Transceiver52M/radioBuffer.cpp

@@ -28,7 +28,7 @@
 
 RadioBuffer::RadioBuffer(size_t numSegments, size_t segmentLen,
 			 size_t hLen, bool outDirection)
-	: writeIndex(0), readIndex(0), availSamples(0)
+	: writeIndex(0), readIndex(0), availSamples(0), segments(numSegments)
 {
 	if (!outDirection)
 		hLen = 0;
@@ -36,7 +36,6 @@ RadioBuffer::RadioBuffer(size_t numSegments, size_t segmentLen,
 	buffer = new float[2 * (hLen + numSegments * segmentLen)];
 	bufferLen = numSegments * segmentLen;
 
-	segments.resize(numSegments);
 
 	for (size_t i = 0; i < numSegments; i++)
 		segments[i] = &buffer[2 * (hLen + i * segmentLen)];

Transceiver52M/radioInterface.cpp

@@ -39,9 +39,10 @@ extern "C" {
 RadioInterface::RadioInterface(RadioDevice *wDevice, size_t tx_sps,
                                size_t rx_sps, size_t chans,
                                int wReceiveOffset, GSM::Time wStartTime)
-  : mDevice(wDevice), mSPSTx(tx_sps), mSPSRx(rx_sps), mChans(chans),
-    underrun(false), overrun(false), writeTimestamp(0), readTimestamp(0),
-    receiveOffset(wReceiveOffset), mOn(false)
+  : mSPSTx(tx_sps), mSPSRx(rx_sps), mChans(chans), mReceiveFIFO(mChans), mDevice(wDevice),
+    sendBuffer(mChans), recvBuffer(mChans), convertRecvBuffer(mChans),
+    convertSendBuffer(mChans), powerScaling(mChans), underrun(false), overrun(false),
+    writeTimestamp(0), readTimestamp(0), receiveOffset(wReceiveOffset), mOn(false)
 {
   mClock.set(wStartTime);
 }
@@ -58,15 +59,6 @@ bool RadioInterface::init(int type)
     return false;
   }
 
-  close();
-
-  sendBuffer.resize(mChans);
-  recvBuffer.resize(mChans);
-  convertSendBuffer.resize(mChans);
-  convertRecvBuffer.resize(mChans);
-  mReceiveFIFO.resize(mChans);
-  powerScaling.resize(mChans);
-
   for (size_t i = 0; i < mChans; i++) {
     sendBuffer[i] = new RadioBuffer(NUMCHUNKS, CHUNK * mSPSTx, 0, true);
     recvBuffer[i] = new RadioBuffer(NUMCHUNKS, CHUNK * mSPSRx, 0, false);

Transceiver52M/radioInterface.h

@@ -31,6 +31,9 @@ static const unsigned gSlotLen = 148;      ///< number of symbols per slot, not
 class RadioInterface {
 
 protected:
+  size_t mSPSTx;
+  size_t mSPSRx;
+  size_t mChans;
 
   Thread mAlignRadioServiceLoopThread;	      ///< thread that synchronizes transmit and receive sections
 
@@ -38,10 +41,6 @@ protected:
 
   RadioDevice *mDevice;			      ///< the USRP object
 
-  size_t mSPSTx;
-  size_t mSPSRx;
-  size_t mChans;
-
   std::vector<RadioBuffer *> sendBuffer;
   std::vector<RadioBuffer *> recvBuffer;
 

Transceiver52M/radioInterfaceMulti.cpp

@@ -44,8 +44,9 @@ extern "C" {
 RadioInterfaceMulti::RadioInterfaceMulti(RadioDevice *radio, size_t tx_sps,
 					 size_t rx_sps, size_t chans)
 	: RadioInterface(radio, tx_sps, rx_sps, chans),
-	  outerSendBuffer(NULL), outerRecvBuffer(NULL),
-	  dnsampler(NULL), upsampler(NULL), channelizer(NULL), synthesis(NULL)
+	  outerSendBuffer(NULL), outerRecvBuffer(NULL), history(mChans), active(MCHANS, false),
+	  rx_freq_state(mChans), tx_freq_state(mChans), dnsampler(NULL), upsampler(NULL), channelizer(NULL),
+	  synthesis(NULL)
 {
 }
 
@@ -74,12 +75,12 @@ void RadioInterfaceMulti::close()
 	for (std::vector<signalVector*>::iterator it = history.begin(); it != history.end(); ++it)
 		delete *it;
 
-	mReceiveFIFO.resize(0);
-	powerScaling.resize(0);
-	history.resize(0);
-	active.resize(0);
-	rx_freq_state.resize(0);
-	tx_freq_state.resize(0);
+	mReceiveFIFO.clear();
+	powerScaling.clear();
+	history.clear();
+	active.clear();
+	rx_freq_state.clear();
+	tx_freq_state.clear();
 
 	RadioInterface::close();
 }
@@ -154,18 +155,9 @@ bool RadioInterfaceMulti::init(int type)
 
 	close();
 
-	sendBuffer.resize(mChans);
-	recvBuffer.resize(mChans);
 	convertSendBuffer.resize(1);
 	convertRecvBuffer.resize(1);
 
-	mReceiveFIFO.resize(mChans);
-	powerScaling.resize(mChans);
-	history.resize(mChans);
-	rx_freq_state.resize(mChans);
-	tx_freq_state.resize(mChans);
-	active.resize(MCHANS, false);
-
 	/* 4 == sps */
 	inchunk = RESAMP_INRATE * 4;
 	outchunk = RESAMP_OUTRATE * 4;

Transceiver52M/radioInterfaceResamp.cpp

@@ -100,13 +100,6 @@ bool RadioInterfaceResamp::init(int type)
 
 	close();
 
-	sendBuffer.resize(1);
-	recvBuffer.resize(1);
-	convertSendBuffer.resize(1);
-	convertRecvBuffer.resize(1);
-	mReceiveFIFO.resize(1);
-	powerScaling.resize(1);
-
 	switch (type) {
 	case RadioDevice::RESAMP_64M:
 		resamp_inrate = RESAMP_64M_INRATE;

Transceiver52M/radioVector.cpp

@@ -76,22 +76,25 @@ bool radioVector::setVector(signalVector *vector, size_t chan)
 	return true;
 }
 
-noiseVector::noiseVector(size_t size)
+avgVector::avgVector(size_t size)
 	: std::vector<float>(size), itr(0)
 {
 }
 
-float noiseVector::avg() const
+float avgVector::avg() const
 {
 	float val = 0.0;
 
+	if (!size())
+		return 0.0f;
+
 	for (size_t i = 0; i < size(); i++)
 		val += (*this)[i];
 
 	return val / (float) size();
 }
 
-bool noiseVector::insert(float val)
+bool avgVector::insert(float val)
 {
 	if (!size())
 		return false;

Transceiver52M/radioVector.h

@@ -48,9 +48,9 @@ private:
 	GSM::Time mTime;
 };
 
-class noiseVector : std::vector<float> {
+class avgVector : std::vector<float> {
 public:
-	noiseVector(size_t size = 0);
+	avgVector(size_t size = 0);
 	bool insert(float val);
 	float avg() const;
 

Transceiver52M/sch.c

@@ -0,0 +1,294 @@
+#include <complex.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/crcgen.h>
+#include <osmocom/coding/gsm0503_coding.h>
+#include <osmocom/coding/gsm0503_parity.h>
+
+#include "sch.h"
+
+/* GSM 04.08, 9.1.30 Synchronization channel information */
+struct sch_packed_info {
+	ubit_t t1_hi[2];
+	ubit_t bsic[6];
+	ubit_t t1_md[8];
+	ubit_t t3p_hi[2];
+	ubit_t t2[5];
+	ubit_t t1_lo[1];
+	ubit_t t3p_lo[1];
+} __attribute__((packed));
+
+struct sch_burst {
+	sbit_t tail0[3];
+	sbit_t data0[39];
+	sbit_t etsc[64];
+	sbit_t data1[39];
+	sbit_t tail1[3];
+	sbit_t guard[8];
+} __attribute__((packed));
+
+static const uint8_t sch_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t sch_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code gsm_conv_sch = {
+	.N = 2,
+	.K = 5,
+	.len = GSM_SCH_UNCODED_LEN,
+	.next_output = sch_next_output,
+	.next_state  = sch_next_state,
+};
+
+#define GSM_MAX_BURST_LEN	157 * 4
+#define GSM_SYM_RATE		(1625e3 / 6) * 4
+
+/* Pre-generated FCCH measurement tone */
+static complex float fcch_ref[GSM_MAX_BURST_LEN];
+
+int float_to_sbit(const float *in, sbit_t *out, float scale, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		out[i] = (in[i] - 0.5f) * scale;
+	}
+
+	return 0;
+}
+
+/* Check if FN contains a FCCH burst */
+int gsm_fcch_check_fn(int fn)
+{
+	int fn51 = fn % 51;
+
+	switch (fn51) {
+	case 0:
+	case 10:
+	case 20:
+	case 30:
+	case 40:
+		return 1;
+	}
+
+	return 0;
+}
+
+/* Check if FN contains a SCH burst */
+int gsm_sch_check_fn(int fn)
+{
+	int fn51 = fn % 51;
+
+	switch (fn51) {
+	case 1:
+	case 11:
+	case 21:
+	case 31:
+	case 41:
+		return 1;
+	}
+
+	return 0;
+}
+
+/* SCH (T1, T2, T3p) to full FN value */
+int gsm_sch_to_fn(struct sch_info *sch)
+{
+	int t1 = sch->t1;
+	int t2 = sch->t2;
+	int t3p = sch->t3p;
+
+	if ((t1 < 0) || (t2 < 0) || (t3p < 0))
+		return -1;
+	int tt;
+	int t3 = t3p * 10 + 1;
+
+	if (t3 < t2)
+		tt = (t3 + 26) - t2;
+	else
+		tt = (t3 - t2) % 26;
+
+	return t1 * 51 * 26 + tt * 51 + t3;
+}
+
+/* Parse encoded SCH message */
+int gsm_sch_parse(const uint8_t *info, struct sch_info *desc)
+{
+	struct sch_packed_info *p = (struct sch_packed_info *) info;
+
+	desc->bsic = (p->bsic[0] << 0) | (p->bsic[1] << 1) |
+		     (p->bsic[2] << 2) | (p->bsic[3] << 3) |
+		     (p->bsic[4] << 4) | (p->bsic[5] << 5);
+
+	desc->t1 = (p->t1_lo[0] << 0) | (p->t1_md[0] << 1) |
+		   (p->t1_md[1] << 2) | (p->t1_md[2] << 3) |
+		   (p->t1_md[3] << 4) | (p->t1_md[4] << 5) |
+		   (p->t1_md[5] << 6) | (p->t1_md[6] << 7) |
+		   (p->t1_md[7] << 8) | (p->t1_hi[0] << 9) |
+		   (p->t1_hi[1] << 10);
+
+	desc->t2 = (p->t2[0] << 0) | (p->t2[1] << 1) |
+		   (p->t2[2] << 2) | (p->t2[3] << 3) |
+		   (p->t2[4] << 4);
+
+	desc->t3p = (p->t3p_lo[0] << 0) | (p->t3p_hi[0] << 1) |
+		    (p->t3p_hi[1] << 2);
+
+	return 0;
+}
+
+/* From osmo-bts */
+__attribute__((xray_always_instrument)) __attribute__((noinline)) int gsm_sch_decode(uint8_t *info, sbit_t *data)
+{
+	int rc;
+	ubit_t uncoded[GSM_SCH_UNCODED_LEN];
+
+	osmo_conv_decode(&gsm_conv_sch, data, uncoded);
+
+	rc = osmo_crc16gen_check_bits(&gsm0503_sch_crc10,
+				      uncoded, GSM_SCH_INFO_LEN,
+				      uncoded + GSM_SCH_INFO_LEN);
+	if (rc)
+		return -1;
+
+	memcpy(info, uncoded, GSM_SCH_INFO_LEN * sizeof(ubit_t));
+
+	return 0;
+}
+
+#define FCCH_TAIL_BITS_LEN	3*4
+#define FCCH_DATA_LEN	100*4//	142
+#if 1
+/* Compute FCCH frequency offset */
+double org_gsm_fcch_offset(float *burst, int len)
+{
+	int i, start, end;
+	float a, b, c, d, ang, avg = 0.0f;
+	double freq;
+
+	if (len > GSM_MAX_BURST_LEN)
+		len = GSM_MAX_BURST_LEN;
+
+	for (i = 0; i < len; i++) {
+		a = burst[2 * i + 0];
+		b = burst[2 * i + 1];
+		c = crealf(fcch_ref[i]);
+		d = cimagf(fcch_ref[i]);
+
+		burst[2 * i + 0] = a * c - b * d;
+		burst[2 * i + 1] = a * d + b * c;
+	}
+
+	start = FCCH_TAIL_BITS_LEN;
+	end = start + FCCH_DATA_LEN;
+
+	for (i = start; i < end; i++) {
+		a = cargf(burst[2 * (i - 1) + 0] +
+			  burst[2 * (i - 1) + 1] * I);
+		b = cargf(burst[2 * i + 0] +
+			  burst[2 * i + 1] * I);
+
+		ang = b - a;
+
+		if (ang > M_PI)
+			ang -= 2 * M_PI;
+		else if (ang < -M_PI)
+			ang += 2 * M_PI;
+
+		avg += ang;
+	}
+
+	avg /= (float) (end - start);
+	freq = avg / (2 * M_PI) * GSM_SYM_RATE;
+
+	return freq;
+}
+
+
+static const int L1 = 3;
+static const int L2 = 32;
+static const int N1 = 92;
+static const int N2 = 92;
+
+static struct { int8_t r; int8_t s; } P_inv_table[3+32];
+
+void pinv(int P, int8_t* r, int8_t* s, int L1, int L2) {
+	for (int i = 0; i < L1; i++)
+		for (int j = 0; j < L2; j++)
+			if (P == L2 * i - L1 * j) {
+				*r = i;
+				*s = j;
+				return;
+			}
+}
+
+
+float ac_sum_with_lag( complex float* in, int lag, int offset, int N) {
+	complex float v = 0 + 0*I;
+	int total_offset = offset + lag;
+	for (int s = 0; s < N; s++)
+		v += in[s + total_offset] * conjf(in[s + total_offset - lag]);
+	return cargf(v);
+}
+
+
+double gsm_fcch_offset(float *burst, int len)
+{
+	int start;
+
+	const float fs = 13. / 48. * 1e6 * 4;
+	const float expected_fcch_val = ((2 * M_PI) / (fs)) * 67700;
+
+	if (len > GSM_MAX_BURST_LEN)
+		len = GSM_MAX_BURST_LEN;
+
+	start = FCCH_TAIL_BITS_LEN+10 * 4;
+	float alpha_one = ac_sum_with_lag((complex float*)burst, L1, start, N1);
+	float alpha_two = ac_sum_with_lag((complex float*)burst, L2, start, N2);
+
+	float P_unrounded = (L1 * alpha_two - L2 * alpha_one) / (2 * M_PI);
+	int P = roundf(P_unrounded);
+
+	int8_t r = 0, s = 0;
+	pinv(P, &r, &s, L1, L2);
+
+	float omegal1 = (alpha_one + 2 * M_PI * r) / L1;
+	float omegal2 = (alpha_two + 2 * M_PI * s) / L2;
+
+	float rv = org_gsm_fcch_offset(burst, len);
+	//return rv;
+
+	float reval = GSM_SYM_RATE / (2 * M_PI) * (expected_fcch_val - (omegal1+omegal2)/2);
+	//fprintf(stderr, "XX rv %f %f %f %f\n", rv, reval, omegal1 / (2 * M_PI) * fs, omegal2 / (2 * M_PI) * fs);
+
+	//fprintf(stderr, "XX rv %f %f\n", rv, reval);
+
+	return -reval;
+}
+#endif
+/* Generate FCCH measurement tone */
+static __attribute__((constructor)) void init()
+{
+	int i;
+	double freq = 0.25;
+
+	for (i = 0; i < GSM_MAX_BURST_LEN; i++) {
+		fcch_ref[i] = sin(2 * M_PI * freq * (double) i) +
+			      cos(2 * M_PI * freq * (double) i) * I;
+	}
+
+}

Transceiver52M/sch.h

@@ -0,0 +1,27 @@
+#ifndef _SCH_H_
+#define _SCH_H_
+
+#include <osmocom/core/bits.h>
+
+struct sch_info  {
+	int bsic;
+	int t1;
+	int t2;
+	int t3p;
+};
+
+#define GSM_SCH_INFO_LEN		25
+#define GSM_SCH_UNCODED_LEN		35
+#define GSM_SCH_CODED_LEN		78
+
+int gsm_sch_decode(uint8_t *sb_info, sbit_t *burst);
+int gsm_sch_parse(const uint8_t *sb_info, struct sch_info *desc);
+int gsm_sch_to_fn(struct sch_info *sch);
+int gsm_sch_check_fn(int fn);
+int gsm_fcch_check_fn(int fn);
+
+double gsm_fcch_offset(float *burst, int len);
+
+int float_to_sbit(const float *in, sbit_t *out, float scale, int len);
+
+#endif /* _SCH_H_ */

Transceiver52M/sigProcLib.cpp

@@ -87,17 +87,19 @@ static Resampler *dnsampler = NULL;
  * perform 16-byte memory alignment required by many SSE instructions.
  */
 struct CorrelationSequence {
-  CorrelationSequence() : sequence(NULL), buffer(NULL), toa(0.0)
+  CorrelationSequence() : sequence(NULL), buffer(NULL), toa(0.0), history(nullptr)
   {
   }
 
   ~CorrelationSequence()
   {
     delete sequence;
+    delete[] history;
   }
 
   signalVector *sequence;
   void         *buffer;
+  complex      *history;
   float        toa;
   complex      gain;
 };
@@ -129,6 +131,8 @@ struct PulseSequence {
 static CorrelationSequence *gMidambles[] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
 static CorrelationSequence *gEdgeMidambles[] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
 static CorrelationSequence *gRACHSequences[] = {NULL,NULL,NULL};
+static CorrelationSequence *gSCHSequence = NULL;
+static CorrelationSequence *gDummySequence = NULL;
 static PulseSequence *GSMPulse1 = NULL;
 static PulseSequence *GSMPulse4 = NULL;
 
@@ -151,6 +155,12 @@ void sigProcLibDestroy()
     gRACHSequences[i] = NULL;
   }
 
+  delete gSCHSequence;
+  gSCHSequence = NULL;
+
+  delete gDummySequence;
+  gDummySequence = NULL;
+
   delete GMSKRotation1;
   delete GMSKReverseRotation1;
   delete GMSKRotation4;
@@ -315,6 +325,8 @@ static signalVector *convolve(const signalVector *x, const signalVector *h,
     append = true;
     break;
   case CUSTOM:
+
+  // FIXME: x->getstart?
     if (start < h->size() - 1) {
       head = h->size() - start;
       append = true;
@@ -1088,6 +1100,7 @@ signalVector *delayVector(const signalVector *in, signalVector *out, float delay
   return out;
 }
 
+__attribute__((xray_never_instrument))
 static complex interpolatePoint(const signalVector &inSig, float ix)
 {
   int start = (int) (floor(ix) - 10);
@@ -1289,6 +1302,77 @@ release:
   return status;
 }
 
+static bool generateDummyMidamble(int sps)
+{
+  bool status = true;
+  float toa;
+  complex *data = NULL;
+  signalVector *autocorr = NULL, *midamble = NULL;
+  signalVector *midMidamble = NULL, *_midMidamble = NULL;
+
+  delete gDummySequence;
+
+  /* Use middle 16 bits of each TSC. Correlation sequence is not pulse shaped */
+  midMidamble = modulateBurst(gDummyBurstTSC.segment(5,16), 0, sps, true);
+  if (!midMidamble)
+    return false;
+
+  /* Simulated receive sequence is pulse shaped */
+  midamble = modulateBurst(gDummyBurstTSC, 0, sps, false);
+  if (!midamble) {
+    status = false;
+    goto release;
+  }
+
+  // NOTE: Because ideal TSC 16-bit midamble is 66 symbols into burst,
+  //       the ideal TSC has an + 180 degree phase shift,
+  //       due to the pi/2 frequency shift, that
+  //       needs to be accounted for.
+  //       26-midamble is 61 symbols into burst, has +90 degree phase shift.
+  scaleVector(*midMidamble, complex(-1.0, 0.0));
+  scaleVector(*midamble, complex(0.0, 1.0));
+
+  conjugateVector(*midMidamble);
+
+  /* For SSE alignment, reallocate the midamble sequence on 16-byte boundary */
+  data = (complex *) convolve_h_alloc(midMidamble->size());
+  _midMidamble = new signalVector(data, 0, midMidamble->size(), convolve_h_alloc, free);
+  _midMidamble->setAligned(true);
+  midMidamble->copyTo(*_midMidamble);
+
+  autocorr = convolve(midamble, _midMidamble, NULL, NO_DELAY);
+  if (!autocorr) {
+    status = false;
+    goto release;
+  }
+
+  gDummySequence = new CorrelationSequence;
+  gDummySequence->sequence = _midMidamble;
+  gDummySequence->gain = peakDetect(*autocorr, &toa, NULL);
+
+  /* For 1 sps only
+   *     (Half of correlation length - 1) + midpoint of pulse shape + remainder
+   *     13.5 = (16 / 2 - 1) + 1.5 + (26 - 10) / 2
+   */
+  if (sps == 1)
+    gDummySequence->toa = toa - 13.5;
+  else
+    gDummySequence->toa = 0;
+
+release:
+  delete autocorr;
+  delete midamble;
+  delete midMidamble;
+
+  if (!status) {
+    delete _midMidamble;
+    free(data);
+    gDummySequence = NULL;
+  }
+
+  return status;
+}
+
 static CorrelationSequence *generateEdgeMidamble(int tsc)
 {
   complex *data = NULL;
@@ -1384,6 +1468,70 @@ release:
   return status;
 }
 
+bool generateSCHSequence(int sps)
+{
+  bool status = true;
+  float toa;
+  complex *data = NULL;
+  signalVector *autocorr = NULL;
+  signalVector *seq0 = NULL, *seq1 = NULL, *_seq1 = NULL;
+
+  delete gSCHSequence;
+
+  seq0 = modulateBurst(gSCHSynchSequence, 0, sps, false);
+  if (!seq0)
+    return false;
+
+  seq1 = modulateBurst(gSCHSynchSequence, 0, sps, true);
+  if (!seq1) {
+    status = false;
+    goto release;
+  }
+
+  conjugateVector(*seq1);
+
+  /* For SSE alignment, reallocate the midamble sequence on 16-byte boundary */
+  data = (complex *) convolve_h_alloc(seq1->size());
+  _seq1 = new signalVector(data, 0, seq1->size(), convolve_h_alloc, free);
+  _seq1->setAligned(true);
+  memcpy(_seq1->begin(), seq1->begin(), seq1->size() * sizeof(complex));
+
+  autocorr = convolve(seq0, _seq1, autocorr, NO_DELAY);
+  if (!autocorr) {
+    status = false;
+    goto release;
+  }
+
+  gSCHSequence = new CorrelationSequence;
+  gSCHSequence->sequence = _seq1;
+  gSCHSequence->buffer = data;
+  gSCHSequence->gain = peakDetect(*autocorr, &toa, NULL);
+  gSCHSequence->history = new complex[_seq1->size()];
+
+  /* For 1 sps only
+   *     (Half of correlation length - 1) + midpoint of pulse shaping filer
+   *     20.5 = (64 / 2 - 1) + 1.5
+   */
+  if (sps == 1)
+    gSCHSequence->toa = toa - 32.5;
+  else
+    gSCHSequence->toa = 0.0;
+
+release:
+  delete autocorr;
+  delete seq0;
+  delete seq1;
+
+  if (!status) {
+    delete _seq1;
+    free(data);
+    gSCHSequence = NULL;
+  }
+
+  return status;
+}
+
+
 /*
  * Peak-to-average computation +/- range from peak in symbols
  */
@@ -1441,14 +1589,15 @@ float energyDetect(const signalVector &rxBurst, unsigned windowLength)
   return energy/windowLength;
 }
 
-static signalVector *downsampleBurst(const signalVector &burst)
+static signalVector *downsampleBurst(const signalVector &burst, int in_len = DOWNSAMPLE_IN_LEN,
+				     int out_len = DOWNSAMPLE_OUT_LEN)
 {
-  signalVector in(DOWNSAMPLE_IN_LEN, dnsampler->len());
-  signalVector *out = new signalVector(DOWNSAMPLE_OUT_LEN);
-  burst.copyToSegment(in, 0, DOWNSAMPLE_IN_LEN);
+	signalVector in(in_len, dnsampler->len());
+	// gSCHSequence->sequence->size(), ensure next conv has no realloc
+	signalVector *out = new signalVector(out_len, 64);
+	burst.copyToSegment(in, 0, in_len);
 
-  if (dnsampler->rotate((float *) in.begin(), DOWNSAMPLE_IN_LEN,
-                        (float *) out->begin(), DOWNSAMPLE_OUT_LEN) < 0) {
+	if (dnsampler->rotate((float *)in.begin(), in_len, (float *)out->begin(), out_len) < 0) {
 		delete out;
 		out = NULL;
 	}
@@ -1469,6 +1618,12 @@ static float computeCI(const signalVector *burst, const CorrelationSequence *syn
   /* Integer position where the sequence starts */
   const int ps = start + 1 - N + (int)roundf(toa);
 
+  if(ps < 0) // might be -22 for toa 40 with N=64, if off by a lot during sch ms sync
+    return 0;
+
+  if (ps + N > burst->size())
+	  return 0;
+
   /* Estimate Signal power */
   S = 0.0f;
   for (int i=0, j=ps; i<(int)N; i++,j++)
@@ -1511,7 +1666,7 @@ static int detectBurst(const signalVector &burst,
     corr_in = &burst;
     break;
   case 4:
-    dec = downsampleBurst(burst);
+	  dec = downsampleBurst(burst, len * 4, len);
 	  /* Running at the downsampled rate at this point: */
 	  corr_in = dec;
 	  sps = 1;
@@ -1593,11 +1748,11 @@ static int detectGeneralBurst(const signalVector &rxBurst, float thresh, int sps
   // Detect potential clipping
   // We still may be able to demod the burst, so we'll give it a try
   // and only report clipping if we can't demod.
-  float maxAmpl = maxAmplitude(rxBurst);
-  if (maxAmpl > CLIP_THRESH) {
-    LOG(INFO) << "max burst amplitude: " << maxAmpl << " is above the clipping threshold: " << CLIP_THRESH << std::endl;
-    clipping = true;
-  }
+  // float maxAmpl = maxAmplitude(rxBurst);
+  // if (maxAmpl > CLIP_THRESH) {
+  //   LOG(INFO) << "max burst amplitude: " << maxAmpl << " is above the clipping threshold: " << CLIP_THRESH << std::endl;
+  //   clipping = true;
+  // }
 
   start = target - head - 1;
   len = head + tail;
@@ -1652,6 +1807,86 @@ static int detectRACHBurst(const signalVector &burst, float threshold, int sps,
   return rc;
 }
 
+int detectSCHBurst(signalVector &burst,
+		    float thresh,
+		    int sps,
+        sch_detect_type state, struct estim_burst_params *ebp)
+{
+  int rc, start, target, head, tail, len;
+  float _toa;
+  complex _amp;
+  CorrelationSequence *sync;
+
+  if ((sps != 1) && (sps != 4))
+    return -1;
+
+  target = 3 + 39 + 64;
+
+  switch (state) {
+  case sch_detect_type::SCH_DETECT_NARROW:
+    head = 4;
+    tail = 4;
+    break;
+  case sch_detect_type::SCH_DETECT_BUFFER:
+	  target = 1;
+	  head = 0;
+	  tail = (12 * 8 * 625) / 4; // 12 frames, downsampled /4 to 1 sps
+	  break;
+  case sch_detect_type::SCH_DETECT_FULL:
+  default:
+    head = target - 1;
+    tail = 39 + 3 + 9;
+    break;
+  }
+
+  start = (target - head) * 1 - 1;
+  len = (head + tail) * 1;
+  sync = gSCHSequence;
+  signalVector corr(len);
+
+  signalVector _burst(burst, sync->sequence->size(), 5);
+
+  memcpy(_burst.begin() - sync->sequence->size(), sync->history, sync->sequence->size() * sizeof(complex));
+
+  memcpy(sync->history, &burst.begin()[burst.size() - sync->sequence->size()],
+         sync->sequence->size() * sizeof(complex));
+
+  rc = detectBurst(_burst, corr, sync, thresh, sps, start, len, ebp);
+
+  if (rc < 0) {
+    return -1;
+  } else if (!rc) {
+      ebp->amp = 0.0f;
+      ebp->toa = 0.0f;
+    return 0;
+  }
+
+  if (state == sch_detect_type::SCH_DETECT_BUFFER)
+	  ebp->toa = ebp->toa - (3 + 39 + 64);
+  else {
+	  /* Subtract forward search bits from delay */
+	  ebp->toa = ebp->toa - head;
+  }
+
+  return rc;
+}
+
+static int detectDummyBurst(const signalVector &burst, float threshold,
+                               int sps, unsigned max_toa, struct estim_burst_params *ebp)
+{
+  int rc, target, head, tail;
+  CorrelationSequence *sync;
+
+  target = 3 + 58 + 16 + 5;
+  head = 10;
+  tail = 6 + max_toa;
+  sync = gDummySequence;
+
+  ebp->tsc = 0;
+  rc = detectGeneralBurst(burst, threshold, sps, target, head, tail, sync, ebp);
+  return rc;
+}
+
 /*
  * Normal burst detection
  *
@@ -1670,7 +1905,7 @@ static int analyzeTrafficBurst(const signalVector &burst, unsigned tsc, float th
     return -SIGERR_UNSUPPORTED;
 
   target = 3 + 58 + 16 + 5;
-  head = 6;
+  head = 10;
   tail = 6 + max_toa;
   sync = gMidambles[tsc];
 
@@ -1719,6 +1954,9 @@ int detectAnyBurst(const signalVector &burst, unsigned tsc, float threshold,
   case RACH:
     rc = detectRACHBurst(burst, threshold, sps, max_toa, type == EXT_RACH, ebp);
     break;
+  case IDLE:
+    rc = detectDummyBurst(burst, threshold, sps, max_toa, ebp);
+    break;
   default:
     LOG(ERR) << "Invalid correlation type";
   }
@@ -1921,6 +2159,9 @@ bool sigProcLibSetup()
   generateRACHSequence(&gRACHSequences[1], gRACHSynchSequenceTS1, 1);
   generateRACHSequence(&gRACHSequences[2], gRACHSynchSequenceTS2, 1);
 
+  generateSCHSequence(1);
+  generateDummyMidamble(1);
+
   for (int tsc = 0; tsc < 8; tsc++) {
     generateMidamble(1, tsc);
     gEdgeMidambles[tsc] = generateEdgeMidamble(tsc);

Transceiver52M/sigProcLib.h

@@ -31,6 +31,7 @@ enum CorrType{
   TSC,         ///< timeslot should contain a normal burst
   EXT_RACH,    ///< timeslot should contain an extended access burst
   RACH,        ///< timeslot should contain an access burst
+  SCH,
   EDGE,        ///< timeslot should contain an EDGE burst
   IDLE         ///< timeslot is an idle (or dummy) burst
 };
@@ -93,6 +94,8 @@ signalVector *generateDummyBurst(int sps, int tn);
 void scaleVector(signalVector &x,
                  complex scale);
 
+signalVector *delayVector(const signalVector *in, signalVector *out, float delay);
+
 /**
         Rough energy estimator.
         @param rxBurst A GSM burst.
@@ -133,6 +136,17 @@ int detectAnyBurst(const signalVector &burst,
                    unsigned max_toa,
                    struct estim_burst_params *ebp);
 
+enum class sch_detect_type {
+	SCH_DETECT_FULL,
+	SCH_DETECT_NARROW,
+	SCH_DETECT_BUFFER,
+};
+
+int detectSCHBurst(signalVector &rxBurst,
+                    float detectThreshold,
+                    int sps,
+                    sch_detect_type state, struct estim_burst_params *ebp);
+
 /** Demodulate burst basde on type and output soft bits */
 SoftVector *demodAnyBurst(const signalVector &burst, CorrType type,
                           int sps, struct estim_burst_params *ebp);

configure.ac

@@ -138,6 +138,11 @@ AC_ARG_WITH(ipc, [
         [enable IPC])
 ])
 
+AC_ARG_WITH(bladerf, [
+    AS_HELP_STRING([--with-bladerf],
+        [enable bladeRF])
+])
+
 AC_ARG_WITH(singledb, [
     AS_HELP_STRING([--with-singledb],
         [enable single daughterboard use on USRP1])
@@ -187,6 +192,10 @@ AS_IF([test "x$with_uhd" = "xyes"],[
     )
 ])
 
+AS_IF([test "x$with_bladerf" = "xyes"], [
+    PKG_CHECK_MODULES(BLADE, libbladeRF >= 2.0)
+])
+
 AS_IF([test "x$with_singledb" = "xyes"], [
     AC_DEFINE(SINGLEDB, 1, Define to 1 for single daughterboard)
 ])
@@ -240,6 +249,7 @@ AM_CONDITIONAL(DEVICE_UHD, [test "x$with_uhd" = "xyes"])
 AM_CONDITIONAL(DEVICE_USRP1, [test "x$with_usrp1" = "xyes"])
 AM_CONDITIONAL(DEVICE_LMS, [test "x$with_lms" = "xyes"])
 AM_CONDITIONAL(DEVICE_IPC, [test "x$with_ipc" = "xyes"])
+AM_CONDITIONAL(DEVICE_BLADE, [test "x$with_bladerf" = "xyes"])
 AM_CONDITIONAL(ARCH_ARM, [test "x$with_neon" = "xyes" || test "x$with_neon_vfpv4" = "xyes"])
 AM_CONDITIONAL(ARCH_ARM_A15, [test "x$with_neon_vfpv4" = "xyes"])
 
@@ -312,6 +322,7 @@ AC_MSG_RESULT([LDFLAGS="$LDFLAGS"])
 dnl Output files
 AC_CONFIG_FILES([\
     Makefile \
+    trxcon/Makefile \
     CommonLibs/Makefile \
     GSM/Makefile \
     Transceiver52M/Makefile \
@@ -325,6 +336,8 @@ AC_CONFIG_FILES([\
     Transceiver52M/device/usrp1/Makefile \
     Transceiver52M/device/lms/Makefile \
     Transceiver52M/device/ipc/Makefile \
+    Transceiver52M/device/ipc2/Makefile \
+    Transceiver52M/device/bladerf/Makefile \
     tests/Makefile \
     tests/CommonLibs/Makefile \
     tests/Transceiver52M/Makefile \

tests/CommonLibs/Makefile.am

@@ -11,7 +11,7 @@ EXTRA_DIST = BitVectorTest.ok \
              LogTest.ok \
              LogTest.err
 
-noinst_PROGRAMS = \
+check_PROGRAMS = \
 	BitVectorTest \
 	PRBSTest \
 	InterthreadTest \

tests/Transceiver52M/Makefile.am

@@ -4,7 +4,7 @@ AM_CFLAGS = -Wall -I$(top_srcdir)/Transceiver52M -I$(top_srcdir)/Transceiver52M/
 
 EXTRA_DIST = convolve_test.ok convolve_test_golden.h
 
-noinst_PROGRAMS = \
+check_PROGRAMS = \
 	convolve_test
 
 convolve_test_SOURCES = convolve_test.c
@@ -18,7 +18,7 @@ convolve_test_CFLAGS += $(SIMD_FLAGS)
 endif
 
 if DEVICE_LMS
-noinst_PROGRAMS += LMSDeviceTest
+check_PROGRAMS += LMSDeviceTest
 LMSDeviceTest_SOURCES = LMSDeviceTest.cpp
 LMSDeviceTest_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LMS_LIBS)
 LMSDeviceTest_LDADD = \

trxcon/Makefile.am

@@ -0,0 +1,51 @@
+include $(top_srcdir)/Makefile.common
+
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-Iinclude \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOCODING_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	-Iinclude \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOCODING_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+
+AM_CPPFLAGS += $(STD_DEFINES_AND_INCLUDES)
+AM_CXXFLAGS = -Wall -O3 -g -ldl -lpthread -Iinclude
+
+noinst_LTLIBRARIES = libtrxcon.la 
+
+libtrxcon_la_SOURCES = \
+	src/sched_lchan_common.c \
+	src/sched_lchan_pdtch.c \
+	src/sched_lchan_desc.c \
+	src/sched_lchan_xcch.c \
+	src/sched_lchan_tchf.c \
+	src/sched_lchan_tchh.c \
+	src/sched_lchan_rach.c \
+	src/sched_lchan_sch.c \
+	src/sched_mframe.c \
+	src/sched_clck.c \
+	src/sched_prim.c \
+	src/sched_trx.c \
+	src/l1ctl_server.c \
+	src/l1ctl.c \
+	src/trx_if.c \
+	src/logging.c \
+	src/trxcon_fsm.c \
+	src/trxcon.c \
+	$(NULL)
+
+libtrxcon_la_LIBADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOCODING_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)

trxcon/configure.ac

@@ -0,0 +1,45 @@
+dnl Process this file with autoconf to produce a configure script
+AC_INIT([trxcon], [0.0.0])
+AM_INIT_AUTOMAKE
+LT_INIT
+
+CFLAGS="$CFLAGS -std=gnu11"
+
+dnl kernel style compile messages
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+dnl checks for programs
+AC_PROG_MAKE_SET
+AC_PROG_CC
+AC_PROG_INSTALL
+
+dnl checks for libraries
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore)
+PKG_CHECK_MODULES(LIBOSMOCODING, libosmocoding)
+PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm)
+
+dnl checks for header files
+AC_HEADER_STDC
+
+AC_ARG_ENABLE(sanitize,
+	[AS_HELP_STRING(
+		[--enable-sanitize],
+		[Compile with address sanitizer enabled],
+	)], [sanitize=$enableval], [sanitize="no"])
+if test x"$sanitize" = x"yes"
+then
+	CFLAGS="$CFLAGS -fsanitize=address -fsanitize=undefined"
+	CPPFLAGS="$CPPFLAGS -fsanitize=address -fsanitize=undefined"
+fi
+
+dnl Checks for typedefs, structures and compiler characteristics
+
+AC_CONFIG_MACRO_DIRS([m4])
+AC_CONFIG_FILES([include/Makefile
+		 include/osmocom/Makefile
+		 include/osmocom/bb/Makefile
+		 include/osmocom/bb/l1sched/Makefile
+		 include/osmocom/bb/trxcon/Makefile
+		 src/Makefile
+		 Makefile])
+AC_OUTPUT

trxcon/include/Makefile.am

@@ -0,0 +1,3 @@
+SUBDIRS = \
+	osmocom \
+	$(NULL)

trxcon/include/osmocom/Makefile.am

@@ -0,0 +1,3 @@
+SUBDIRS = \
+	bb \
+	$(NULL)

trxcon/include/osmocom/bb/Makefile.am

@@ -0,0 +1,4 @@
+SUBDIRS = \
+	l1sched \
+	trxcon \
+	$(NULL)

trxcon/include/osmocom/bb/l1sched/Makefile.am

@@ -0,0 +1,4 @@
+noinst_HEADERS = \
+	l1sched.h \
+	logging.h \
+	$(NULL)

trxcon/include/osmocom/bb/l1sched/l1sched.h

@@ -0,0 +1,508 @@
+#pragma once
+
+#include <time.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <arpa/inet.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/gsm0502.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/timer.h>
+
+#define GSM_BURST_LEN		148
+#define GSM_BURST_PL_LEN	116
+
+#define GPRS_BURST_LEN		GSM_BURST_LEN
+#define EDGE_BURST_LEN		444
+
+#define GPRS_L2_MAX_LEN		54
+#define EDGE_L2_MAX_LEN		155
+
+#define L1SCHED_CH_LID_DEDIC	0x00
+#define L1SCHED_CH_LID_SACCH	0x40
+
+/* Osmocom-specific extension for PTCCH (see 3GPP TS 45.002, section 3.3.4.2).
+ * Shall be used to distinguish PTCCH and PDTCH channels on a PDCH time-slot. */
+#define L1SCHED_CH_LID_PTCCH	0x80
+
+/* Is a channel related to PDCH (GPRS) */
+#define L1SCHED_CH_FLAG_PDCH	(1 << 0)
+/* Should a channel be activated automatically */
+#define L1SCHED_CH_FLAG_AUTO	(1 << 1)
+/* Is continuous burst transmission assumed */
+#define L1SCHED_CH_FLAG_CBTX	(1 << 2)
+
+#define MAX_A5_KEY_LEN		(128 / 8)
+#define TRX_TS_COUNT		8
+
+struct l1sched_lchan_state;
+struct l1sched_meas_set;
+struct l1sched_state;
+struct l1sched_ts;
+
+enum l1sched_clck_state {
+	L1SCHED_CLCK_ST_WAIT,
+	L1SCHED_CLCK_ST_OK,
+};
+
+enum l1sched_burst_type {
+	L1SCHED_BURST_GMSK,
+	L1SCHED_BURST_8PSK,
+};
+
+enum l1sched_ts_prim_type {
+	L1SCHED_PRIM_DATA,
+	L1SCHED_PRIM_RACH8,
+	L1SCHED_PRIM_RACH11,
+};
+
+/**
+ * These types define the different channels on a multiframe.
+ * Each channel has queues and can be activated individually.
+ */
+enum l1sched_lchan_type {
+	L1SCHED_IDLE = 0,
+	L1SCHED_FCCH,
+	L1SCHED_SCH,
+	L1SCHED_BCCH,
+	L1SCHED_RACH,
+	L1SCHED_CCCH,
+	L1SCHED_TCHF,
+	L1SCHED_TCHH_0,
+	L1SCHED_TCHH_1,
+	L1SCHED_SDCCH4_0,
+	L1SCHED_SDCCH4_1,
+	L1SCHED_SDCCH4_2,
+	L1SCHED_SDCCH4_3,
+	L1SCHED_SDCCH8_0,
+	L1SCHED_SDCCH8_1,
+	L1SCHED_SDCCH8_2,
+	L1SCHED_SDCCH8_3,
+	L1SCHED_SDCCH8_4,
+	L1SCHED_SDCCH8_5,
+	L1SCHED_SDCCH8_6,
+	L1SCHED_SDCCH8_7,
+	L1SCHED_SACCHTF,
+	L1SCHED_SACCHTH_0,
+	L1SCHED_SACCHTH_1,
+	L1SCHED_SACCH4_0,
+	L1SCHED_SACCH4_1,
+	L1SCHED_SACCH4_2,
+	L1SCHED_SACCH4_3,
+	L1SCHED_SACCH8_0,
+	L1SCHED_SACCH8_1,
+	L1SCHED_SACCH8_2,
+	L1SCHED_SACCH8_3,
+	L1SCHED_SACCH8_4,
+	L1SCHED_SACCH8_5,
+	L1SCHED_SACCH8_6,
+	L1SCHED_SACCH8_7,
+	L1SCHED_PDTCH,
+	L1SCHED_PTCCH,
+	L1SCHED_SDCCH4_CBCH,
+	L1SCHED_SDCCH8_CBCH,
+	_L1SCHED_CHAN_MAX
+};
+
+enum l1sched_data_type {
+	L1SCHED_DT_PACKET_DATA,
+	L1SCHED_DT_SIGNALING,
+	L1SCHED_DT_TRAFFIC,
+	L1SCHED_DT_OTHER, /* SCH and RACH */
+};
+
+enum l1sched_config_type {
+	/*! Channel combination for a timeslot */
+	L1SCHED_CFG_PCHAN_COMB,
+};
+
+/* Represents a (re)configuration request */
+struct l1sched_config_req {
+	enum l1sched_config_type type;
+	union {
+		struct {
+			uint8_t tn;
+			enum gsm_phys_chan_config pchan;
+		} pchan_comb;
+	};
+};
+
+/* Represents a burst to be transmitted */
+struct l1sched_burst_req {
+	uint32_t fn;
+	uint8_t tn;
+	uint8_t pwr;
+
+	/* Internally used by the scheduler */
+	uint8_t bid;
+
+	ubit_t burst[EDGE_BURST_LEN];
+	size_t burst_len;
+};
+
+typedef int l1sched_lchan_rx_func(struct l1sched_lchan_state *lchan,
+				  uint32_t fn, uint8_t bid, const sbit_t *bits,
+				  const struct l1sched_meas_set *meas);
+
+typedef int l1sched_lchan_tx_func(struct l1sched_lchan_state *lchan,
+				  struct l1sched_burst_req *br);
+
+struct l1sched_lchan_desc {
+	/*! Human-readable name */
+	const char *name;
+	/*! Human-readable description */
+	const char *desc;
+
+	/*! Channel Number (like in RSL) */
+	uint8_t chan_nr;
+	/*! Link ID (like in RSL) */
+	uint8_t link_id;
+	/*! Sub-slot number (for SDCCH and TCH/H) */
+	uint8_t ss_nr;
+	/*! GSMTAP channel type (see GSMTAP_CHANNEL_*) */
+	uint8_t gsmtap_chan_type;
+
+	/*! How much memory do we need to store bursts */
+	size_t burst_buf_size;
+	/*! Channel specific flags */
+	uint8_t flags;
+
+	/*! Function to call when burst received from PHY */
+	l1sched_lchan_rx_func *rx_fn;
+	/*! Function to call when data received from L2 */
+	l1sched_lchan_tx_func *tx_fn;
+};
+
+struct l1sched_tdma_frame {
+	/*! Downlink channel (slot) type */
+	enum l1sched_lchan_type dl_chan;
+	/*! Downlink block ID */
+	uint8_t dl_bid;
+	/*! Uplink channel (slot) type */
+	enum l1sched_lchan_type ul_chan;
+	/*! Uplink block ID */
+	uint8_t ul_bid;
+};
+
+struct l1sched_tdma_multiframe {
+	/*! Channel combination */
+	enum gsm_phys_chan_config chan_config;
+	/*! Human-readable name */
+	const char *name;
+	/*! Repeats how many frames */
+	uint8_t period;
+	/*! Applies to which timeslots */
+	uint8_t slotmask;
+	/*! Contains which lchans */
+	uint64_t lchan_mask;
+	/*! Pointer to scheduling structure */
+	const struct l1sched_tdma_frame *frames;
+};
+
+struct l1sched_meas_set {
+	/*! TDMA frame number of the first burst this set belongs to */
+	uint32_t fn;
+	/*! ToA256 (Timing of Arrival, 1/256 of a symbol) */
+	int16_t toa256;
+	/*! RSSI (Received Signal Strength Indication) */
+	int8_t rssi;
+};
+
+/* Simple ring buffer (up to 8 unique measurements) */
+struct l1sched_lchan_meas_hist {
+	struct l1sched_meas_set buf[8];
+	struct l1sched_meas_set *head;
+};
+
+/* States each channel on a multiframe */
+struct l1sched_lchan_state {
+	/*! Channel type */
+	enum l1sched_lchan_type type;
+	/*! Channel status */
+	uint8_t active;
+	/*! Link to a list of channels */
+	struct llist_head list;
+
+	/*! Burst type: GMSK or 8PSK */
+	enum l1sched_burst_type burst_type;
+	/*! Mask of received bursts */
+	uint8_t rx_burst_mask;
+	/*! Mask of transmitted bursts */
+	uint8_t tx_burst_mask;
+	/*! Burst buffer for RX */
+	sbit_t *rx_bursts;
+	/*! Burst buffer for TX */
+	ubit_t *tx_bursts;
+
+	/*! A primitive being sent */
+	struct l1sched_ts_prim *prim;
+
+	/*! Mode for TCH channels (see GSM48_CMODE_*) */
+	uint8_t	tch_mode;
+	/*! Training Sequence Code */
+	uint8_t tsc;
+
+	/*! FACCH/H on downlink */
+	bool dl_ongoing_facch;
+	/*! pending FACCH/H blocks on Uplink */
+	uint8_t ul_facch_blocks;
+
+	/*! Downlink measurements history */
+	struct l1sched_lchan_meas_hist meas_hist;
+	/*! AVG measurements of the last received block */
+	struct l1sched_meas_set meas_avg;
+
+	/*! TDMA loss detection state */
+	struct {
+		/*! Last processed TDMA frame number */
+		uint32_t last_proc;
+		/*! Number of processed TDMA frames */
+		unsigned long num_proc;
+		/*! Number of lost TDMA frames */
+		unsigned long num_lost;
+	} tdma;
+
+	/*! SACCH state */
+	struct {
+		/*! Cached measurement report (last received) */
+		uint8_t mr_cache[GSM_MACBLOCK_LEN];
+		/*! Cache usage counter */
+		uint8_t mr_cache_usage;
+		/*! Was a MR transmitted last time? */
+		bool mr_tx_last;
+	} sacch;
+
+	/* AMR specific */
+	struct {
+		/*! 4 possible codecs for AMR */
+		uint8_t codec[4];
+		/*! Number of possible codecs */
+		uint8_t codecs;
+		/*! Current uplink FT index */
+		uint8_t ul_ft;
+		/*! Current downlink FT index */
+		uint8_t dl_ft;
+		/*! Current uplink CMR index */
+		uint8_t ul_cmr;
+		/*! Current downlink CMR index */
+		uint8_t dl_cmr;
+		/*! If AMR loop is enabled */
+		uint8_t amr_loop;
+		/*! Number of bit error rates */
+		uint8_t ber_num;
+		/*! Sum of bit error rates */
+		float ber_sum;
+		/* last received dtx frame type */
+		uint8_t	last_dtx;
+	} amr;
+
+	/*! A5/X encryption state */
+	struct {
+		uint8_t key[MAX_A5_KEY_LEN];
+		uint8_t key_len;
+		uint8_t algo;
+	} a5;
+
+	/* TS that this lchan belongs to */
+	struct l1sched_ts *ts;
+};
+
+struct l1sched_ts {
+	/*! Timeslot index within a frame (0..7) */
+	uint8_t index;
+
+	/*! Pointer to multiframe layout */
+	const struct l1sched_tdma_multiframe *mf_layout;
+	/*! Channel states for logical channels */
+	struct llist_head lchans;
+	/*! Queue primitives for TX */
+	struct llist_head tx_prims;
+	/*! Backpointer to the scheduler */
+	struct l1sched_state *sched;
+};
+
+/* Represents one TX primitive in the queue of l1sched_ts */
+struct l1sched_ts_prim {
+	/*! Link to queue of TS */
+	struct llist_head list;
+	/*! Type of primitive */
+	enum l1sched_ts_prim_type type;
+	/*! Logical channel type */
+	enum l1sched_lchan_type chan;
+	/*! Payload length */
+	size_t payload_len;
+	/*! Payload */
+	uint8_t payload[0];
+};
+
+/*! Represents a RACH (8-bit or 11-bit) primitive */
+struct l1sched_ts_prim_rach {
+	/*! RA value */
+	uint16_t ra;
+	/*! Training Sequence (only for 11-bit RA) */
+	uint8_t synch_seq;
+	/*! Transmission offset (how many frames to skip) */
+	uint8_t offset;
+};
+
+/*! Scheduler configuration */
+struct l1sched_cfg {
+	/*! Logging context (used as prefix for messages) */
+	const char *log_prefix;
+	/*! TDMA frame-number advance */
+	uint32_t fn_advance;
+};
+
+/*! One scheduler instance */
+struct l1sched_state {
+	/*! Clock state */
+	enum l1sched_clck_state clck_state;
+	/*! Local clock source */
+	struct timespec clock;
+	/*! Count of processed frames */
+	uint32_t fn_counter_proc;
+	/*! Local frame counter advance */
+	uint32_t fn_counter_advance;
+	/*! Count of lost frames */
+	uint32_t fn_counter_lost;
+	/*! Frame callback timer */
+	struct osmo_timer_list clock_timer;
+	/*! Frame callback */
+	void (*clock_cb)(struct l1sched_state *sched);
+	/*! List of timeslots maintained by this scheduler */
+	struct l1sched_ts *ts[TRX_TS_COUNT];
+	/*! SACCH cache (common for all lchans) */
+	uint8_t sacch_cache[GSM_MACBLOCK_LEN];
+	/*! BSIC value learned from SCH bursts */
+	uint8_t bsic;
+	/*! Logging context (used as prefix for messages) */
+	const char *log_prefix;
+	/*! Some private data */
+	void *priv;
+};
+
+extern const struct l1sched_lchan_desc l1sched_lchan_desc[_L1SCHED_CHAN_MAX];
+const struct l1sched_tdma_multiframe *l1sched_mframe_layout(
+	enum gsm_phys_chan_config config, int tn);
+
+/* Scheduler management functions */
+void l1sched_logging_init(int log_cat_common, int log_cat_data);
+struct l1sched_state *l1sched_alloc(void *ctx, const struct l1sched_cfg *cfg, void *priv);
+void l1sched_reset(struct l1sched_state *sched, bool reset_clock);
+void l1sched_free(struct l1sched_state *sched);
+
+/* Timeslot management functions */
+struct l1sched_ts *l1sched_add_ts(struct l1sched_state *sched, int tn);
+void l1sched_del_ts(struct l1sched_state *sched, int tn);
+int l1sched_reset_ts(struct l1sched_state *sched, int tn);
+int l1sched_configure_ts(struct l1sched_state *sched, int tn,
+	enum gsm_phys_chan_config config);
+int l1sched_start_ciphering(struct l1sched_ts *ts, uint8_t algo,
+			    const uint8_t *key, uint8_t key_len);
+
+/* Logical channel management functions */
+enum gsm_phys_chan_config l1sched_chan_nr2pchan_config(uint8_t chan_nr);
+enum l1sched_lchan_type l1sched_chan_nr2lchan_type(uint8_t chan_nr,
+	uint8_t link_id);
+
+void l1sched_deactivate_all_lchans(struct l1sched_ts *ts);
+int l1sched_set_lchans(struct l1sched_ts *ts, uint8_t chan_nr,
+		       int active, uint8_t tch_mode, uint8_t tsc);
+int l1sched_activate_lchan(struct l1sched_ts *ts, enum l1sched_lchan_type chan);
+int l1sched_deactivate_lchan(struct l1sched_ts *ts, enum l1sched_lchan_type chan);
+struct l1sched_lchan_state *l1sched_find_lchan(struct l1sched_ts *ts,
+	enum l1sched_lchan_type chan);
+
+/* Primitive management functions */
+struct l1sched_ts_prim *l1sched_prim_push(struct l1sched_state *sched,
+					  enum l1sched_ts_prim_type type,
+					  uint8_t chan_nr, uint8_t link_id,
+					  const uint8_t *pl, size_t pl_len);
+
+#define L1SCHED_TCH_MODE_IS_SPEECH(mode)   \
+	  (mode == GSM48_CMODE_SPEECH_V1   \
+	|| mode == GSM48_CMODE_SPEECH_EFR  \
+	|| mode == GSM48_CMODE_SPEECH_AMR)
+
+#define L1SCHED_TCH_MODE_IS_DATA(mode)    \
+	  (mode == GSM48_CMODE_DATA_14k5  \
+	|| mode == GSM48_CMODE_DATA_12k0  \
+	|| mode == GSM48_CMODE_DATA_6k0   \
+	|| mode == GSM48_CMODE_DATA_3k6)
+
+#define L1SCHED_CHAN_IS_TCH(chan) \
+	(chan == L1SCHED_TCHF || chan == L1SCHED_TCHH_0 || chan == L1SCHED_TCHH_1)
+
+#define L1SCHED_CHAN_IS_SACCH(chan) \
+	(l1sched_lchan_desc[chan].link_id & L1SCHED_CH_LID_SACCH)
+
+#define L1SCHED_PRIM_IS_RACH11(prim) \
+	(prim->type == L1SCHED_PRIM_RACH11)
+
+#define L1SCHED_PRIM_IS_RACH8(prim) \
+	(prim->type == L1SCHED_PRIM_RACH8)
+
+#define L1SCHED_PRIM_IS_RACH(prim) \
+	(L1SCHED_PRIM_IS_RACH8(prim) || L1SCHED_PRIM_IS_RACH11(prim))
+
+#define L1SCHED_PRIM_IS_TCH(prim) \
+	(L1SCHED_CHAN_IS_TCH(prim->chan) && prim->payload_len != GSM_MACBLOCK_LEN)
+
+#define L1SCHED_PRIM_IS_FACCH(prim) \
+	(L1SCHED_CHAN_IS_TCH(prim->chan) && prim->payload_len == GSM_MACBLOCK_LEN)
+
+struct l1sched_ts_prim *l1sched_prim_dequeue(struct llist_head *queue,
+	uint32_t fn, struct l1sched_lchan_state *lchan);
+int l1sched_prim_dummy(struct l1sched_lchan_state *lchan);
+void l1sched_prim_drop(struct l1sched_lchan_state *lchan);
+void l1sched_prim_flush_queue(struct llist_head *list);
+
+int l1sched_handle_rx_burst(struct l1sched_state *sched, uint8_t tn,
+	uint32_t fn, sbit_t *bits, uint16_t nbits,
+	const struct l1sched_meas_set *meas);
+
+/* Shared declarations for lchan handlers */
+extern const uint8_t l1sched_nb_training_bits[8][26];
+
+const char *l1sched_burst_mask2str(const uint8_t *mask, int bits);
+size_t l1sched_bad_frame_ind(uint8_t *l2, struct l1sched_lchan_state *lchan);
+
+/* Interleaved TCH/H block TDMA frame mapping */
+bool l1sched_tchh_block_map_fn(enum l1sched_lchan_type chan,
+	uint32_t fn, bool ul, bool facch, bool start);
+
+#define l1sched_tchh_traffic_start(chan, fn, ul) \
+	l1sched_tchh_block_map_fn(chan, fn, ul, 0, 1)
+#define l1sched_tchh_traffic_end(chan, fn, ul) \
+	l1sched_tchh_block_map_fn(chan, fn, ul, 0, 0)
+
+#define l1sched_tchh_facch_start(chan, fn, ul) \
+	l1sched_tchh_block_map_fn(chan, fn, ul, 1, 1)
+#define l1sched_tchh_facch_end(chan, fn, ul) \
+	l1sched_tchh_block_map_fn(chan, fn, ul, 1, 0)
+
+/* Measurement history */
+void l1sched_lchan_meas_push(struct l1sched_lchan_state *lchan, const struct l1sched_meas_set *meas);
+void l1sched_lchan_meas_avg(struct l1sched_lchan_state *lchan, unsigned int n);
+
+int l1sched_clck_handle(struct l1sched_state *sched, uint32_t fn);
+void l1sched_clck_reset(struct l1sched_state *sched);
+
+/* External L1 API, must be implemented by the API user */
+int l1sched_handle_config_req(struct l1sched_state *sched,
+			      const struct l1sched_config_req *cr);
+int l1sched_handle_burst_req(struct l1sched_state *sched,
+			     const struct l1sched_burst_req *br);
+
+/* External L2 API, must be implemented by the API user */
+int l1sched_handle_data_ind(struct l1sched_lchan_state *lchan,
+			    const uint8_t *data, size_t data_len,
+			    int n_errors, int n_bits_total,
+			    enum l1sched_data_type dt);
+int l1sched_handle_data_cnf(struct l1sched_lchan_state *lchan,
+			    uint32_t fn, enum l1sched_data_type dt);

trxcon/include/osmocom/bb/l1sched/logging.h

@@ -0,0 +1,35 @@
+#pragma once
+
+extern int l1sched_log_cat_common;
+extern int l1sched_log_cat_data;
+
+/* Messages using l1sched_state as the context */
+#define LOGP_SCHED_CAT(sched, cat, level, fmt, args...) \
+	LOGP(l1sched_log_cat_##cat, level, "%s" fmt, \
+	     (sched)->log_prefix, ## args)
+
+/* Common messages using l1sched_state as the context */
+#define LOGP_SCHEDC(sched, level, fmt, args...) \
+	LOGP_SCHED_CAT(sched, common, level, fmt, ## args)
+
+/* Data messages using l1sched_state as the context */
+#define LOGP_SCHEDD(sched, level, fmt, args...) \
+	LOGP_SCHED_CAT(sched, common, level, fmt, ## args)
+
+
+#define LOGP_LCHAN_NAME_FMT "TS%u-%s"
+#define LOGP_LCHAN_NAME_ARGS(lchan) \
+	(lchan)->ts->index, l1sched_lchan_desc[(lchan)->type].name
+
+/* Messages using l1sched_lchan_state as the context */
+#define LOGP_LCHAN_CAT(lchan, cat, level, fmt, args...) \
+	LOGP_SCHED_CAT((lchan)->ts->sched, cat, level, LOGP_LCHAN_NAME_FMT " " fmt, \
+		       LOGP_LCHAN_NAME_ARGS(lchan), ## args)
+
+/* Common messages using l1sched_lchan_state as the context */
+#define LOGP_LCHANC(lchan, level, fmt, args...) \
+	LOGP_LCHAN_CAT(lchan, common, level, fmt, ## args)
+
+/* Data messages using l1sched_lchan_state as the context */
+#define LOGP_LCHAND(lchan, level, fmt, args...) \
+	LOGP_LCHAN_CAT(lchan, data, level, fmt, ## args)

trxcon/include/osmocom/bb/trxcon/Makefile.am

@@ -0,0 +1,9 @@
+noinst_HEADERS = \
+	l1ctl_proto.h \
+	l1ctl_server.h \
+	l1ctl.h \
+	sched_utils.h \
+	trx_if.h \
+	logging.h \
+	trxcon.h \
+	$(NULL)

trxcon/include/osmocom/bb/trxcon/l1ctl.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <stdint.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/bb/trxcon/l1ctl_server.h>
+#include <osmocom/bb/trxcon/l1ctl_proto.h>
+
+/* Event handlers */
+int l1ctl_rx_cb(struct l1ctl_client *l1c, struct msgb *msg);
+
+int l1ctl_tx_fbsb_conf(struct l1ctl_client *l1c, uint16_t band_arfcn, uint8_t bsic);
+int l1ctl_tx_fbsb_fail(struct l1ctl_client *l1c, uint16_t band_arfcn);
+int l1ctl_tx_ccch_mode_conf(struct l1ctl_client *l1c, uint8_t mode);
+int l1ctl_tx_pm_conf(struct l1ctl_client *l1c, uint16_t band_arfcn,
+	int dbm, int last);
+int l1ctl_tx_reset_conf(struct l1ctl_client *l1c, uint8_t type);
+int l1ctl_tx_reset_ind(struct l1ctl_client *l1c, uint8_t type);
+
+int l1ctl_tx_dt_ind(struct l1ctl_client *l1c,
+		    const struct l1ctl_info_dl *dl_info,
+		    const uint8_t *l2, size_t l2_len,
+		    bool traffic);
+int l1ctl_tx_dt_conf(struct l1ctl_client *l1c,
+	struct l1ctl_info_dl *data, bool traffic);
+int l1ctl_tx_rach_conf(struct l1ctl_client *l1c,
+	uint16_t band_arfcn, uint32_t fn);

trxcon/include/osmocom/bb/trxcon/l1ctl_proto.h

@@ -0,0 +1,389 @@
+/* Messages to be sent between the different layers */
+
+/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2010 by Holger Hans Peter Freyther
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __L1CTL_PROTO_H__
+#define __L1CTL_PROTO_H__
+
+enum {
+	_L1CTL_NONE		= 0,
+	L1CTL_FBSB_REQ,
+	L1CTL_FBSB_CONF,
+	L1CTL_DATA_IND,
+	L1CTL_RACH_REQ,
+	L1CTL_DM_EST_REQ,
+	L1CTL_DATA_REQ,
+	L1CTL_RESET_IND,
+	L1CTL_PM_REQ,		/* power measurement */
+	L1CTL_PM_CONF,		/* power measurement */
+	L1CTL_ECHO_REQ,
+	L1CTL_ECHO_CONF,
+	L1CTL_RACH_CONF,
+	L1CTL_RESET_REQ,
+	L1CTL_RESET_CONF,
+	L1CTL_DATA_CONF,
+	L1CTL_CCCH_MODE_REQ,
+	L1CTL_CCCH_MODE_CONF,
+	L1CTL_DM_REL_REQ,
+	L1CTL_PARAM_REQ,
+	L1CTL_DM_FREQ_REQ,
+	L1CTL_CRYPTO_REQ,
+	L1CTL_SIM_REQ,
+	L1CTL_SIM_CONF,
+	L1CTL_TCH_MODE_REQ,
+	L1CTL_TCH_MODE_CONF,
+	L1CTL_NEIGH_PM_REQ,
+	L1CTL_NEIGH_PM_IND,
+	L1CTL_TRAFFIC_REQ,
+	L1CTL_TRAFFIC_CONF,
+	L1CTL_TRAFFIC_IND,
+	L1CTL_BURST_IND,
+
+	/* configure TBF for uplink/downlink */
+	L1CTL_TBF_CFG_REQ,
+	L1CTL_TBF_CFG_CONF,
+
+	L1CTL_DATA_TBF_REQ,
+	L1CTL_DATA_TBF_CONF,
+
+	/* Extended (11-bit) RACH (see 3GPP TS 05.02, section 5.2.7) */
+	L1CTL_EXT_RACH_REQ,
+};
+
+enum ccch_mode {
+	CCCH_MODE_NONE = 0,
+	CCCH_MODE_NON_COMBINED,
+	CCCH_MODE_COMBINED,
+	CCCH_MODE_COMBINED_CBCH,
+};
+
+enum neigh_mode {
+	NEIGH_MODE_NONE = 0,
+	NEIGH_MODE_PM,
+	NEIGH_MODE_SB,
+};
+
+enum l1ctl_coding_scheme {
+	L1CTL_CS_NONE,
+	L1CTL_CS1,
+	L1CTL_CS2,
+	L1CTL_CS3,
+	L1CTL_CS4,
+	L1CTL_MCS1,
+	L1CTL_MCS2,
+	L1CTL_MCS3,
+	L1CTL_MCS4,
+	L1CTL_MCS5,
+	L1CTL_MCS6,
+	L1CTL_MCS7,
+	L1CTL_MCS8,
+	L1CTL_MCS9,
+};
+
+/*
+ * NOTE: struct size. We do add manual padding out of the believe
+ * that it will avoid some unaligned access.
+ */
+
+/* there are no more messages in a sequence */
+#define L1CTL_F_DONE	0x01
+
+struct l1ctl_hdr {
+	uint8_t msg_type;
+	uint8_t flags;
+	uint8_t padding[2];
+	uint8_t data[0];
+} __attribute__((packed));
+
+/*
+ * downlink info ... down from the BTS..
+ */
+struct l1ctl_info_dl {
+	/* GSM 08.58 channel number (9.3.1) */
+	uint8_t chan_nr;
+	/* GSM 08.58 link identifier (9.3.2) */
+	uint8_t link_id;
+	/* the ARFCN and the band. FIXME: what about MAIO? */
+	uint16_t band_arfcn;
+
+	uint32_t frame_nr;
+
+	uint8_t rx_level;	/* 0 .. 63 in typical GSM notation (dBm+110) */
+	uint8_t snr;		/* Signal/Noise Ration (dB) */
+	uint8_t num_biterr;
+	uint8_t fire_crc;
+
+	uint8_t payload[0];
+} __attribute__((packed));
+
+/* new CCCH was found. This is following the header */
+struct l1ctl_fbsb_conf {
+	int16_t initial_freq_err;
+	uint8_t result;
+	uint8_t bsic;
+	/* FIXME: contents of cell_info ? */
+} __attribute__((packed));
+
+/* CCCH mode was changed */
+struct l1ctl_ccch_mode_conf {
+	uint8_t ccch_mode;	/* enum ccch_mode */
+	uint8_t padding[3];
+} __attribute__((packed));
+
+/* 3GPP TS 44.014, section 5.1 (Calypso specific numbers) */
+enum l1ctl_tch_loop_mode {
+	L1CTL_TCH_LOOP_OPEN	= 0x00,
+	L1CTL_TCH_LOOP_A	= 0x01,
+	L1CTL_TCH_LOOP_B	= 0x02,
+	L1CTL_TCH_LOOP_C	= 0x03,
+	L1CTL_TCH_LOOP_D	= 0x04,
+	L1CTL_TCH_LOOP_E	= 0x05,
+	L1CTL_TCH_LOOP_F	= 0x06,
+	L1CTL_TCH_LOOP_I	= 0x07,
+};
+
+/* TCH mode was changed */
+struct l1ctl_tch_mode_conf {
+	uint8_t tch_mode;	/* enum tch_mode */
+	uint8_t audio_mode;
+	uint8_t tch_loop_mode;	/* enum l1ctl_tch_loop_mode */
+	struct { /* 3GPP TS 08.58 9.3.52, 3GPP TS 44.018 10.5.2.21aa */
+		uint8_t start_codec;
+		uint8_t codecs_bitmask;
+	} amr;
+} __attribute__((packed));
+
+/* data on the CCCH was found. This is following the header */
+struct l1ctl_data_ind {
+	uint8_t data[23];
+} __attribute__((packed));
+
+/* traffic from the network */
+struct l1ctl_traffic_ind {
+	uint8_t data[0];
+} __attribute__((packed));
+
+/*
+ * uplink info
+ */
+struct l1ctl_info_ul {
+	/* GSM 08.58 channel number (9.3.1) */
+	uint8_t chan_nr;
+	/* GSM 08.58 link identifier (9.3.2) */
+	uint8_t link_id;
+	uint8_t padding[2];
+
+	uint8_t payload[0];
+} __attribute__((packed));
+
+struct l1ctl_info_ul_tbf {
+	/* references l1ctl_tbf_cfg_req.tbf_nr */
+	uint8_t tbf_nr;
+	uint8_t coding_scheme;
+	uint8_t padding[2];
+	/* RLC/MAC block, size determines CS */
+	uint8_t payload[0];
+} __attribute__((packed));
+
+/*
+ * msg for FBSB_REQ
+ * the l1_info_ul header is in front
+ */
+struct l1ctl_fbsb_req {
+	uint16_t band_arfcn;
+	uint16_t timeout;	/* in TDMA frames */
+
+	uint16_t freq_err_thresh1;
+	uint16_t freq_err_thresh2;
+
+	uint8_t num_freqerr_avg;
+	uint8_t flags;		/* L1CTL_FBSB_F_* */
+	uint8_t sync_info_idx;
+	uint8_t ccch_mode;	/* enum ccch_mode */
+	uint8_t rxlev_exp;	/* expected signal level */
+} __attribute__((packed));
+
+#define L1CTL_FBSB_F_FB0	(1 << 0)
+#define L1CTL_FBSB_F_FB1	(1 << 1)
+#define L1CTL_FBSB_F_SB		(1 << 2)
+#define L1CTL_FBSB_F_FB01SB	(L1CTL_FBSB_F_FB0|L1CTL_FBSB_F_FB1|L1CTL_FBSB_F_SB)
+
+/*
+ * msg for CCCH_MODE_REQ
+ * the l1_info_ul header is in front
+ */
+struct l1ctl_ccch_mode_req {
+	uint8_t ccch_mode;	/* enum ccch_mode */
+	uint8_t padding[3];
+} __attribute__((packed));
+
+/*
+ * msg for TCH_MODE_REQ
+ * the l1_info_ul header is in front
+ */
+struct l1ctl_tch_mode_req {
+	uint8_t tch_mode;	/* enum gsm48_chan_mode */
+#define AUDIO_TX_MICROPHONE	(1<<0)
+#define AUDIO_TX_TRAFFIC_REQ	(1<<1)
+#define AUDIO_RX_SPEAKER	(1<<2)
+#define AUDIO_RX_TRAFFIC_IND	(1<<3)
+	uint8_t audio_mode;
+	uint8_t tch_loop_mode;	/* enum l1ctl_tch_loop_mode */
+	struct { /* 3GPP TS 08.58 9.3.52, 3GPP TS 44.018 10.5.2.21aa */
+		uint8_t start_codec;
+		uint8_t codecs_bitmask;
+	} amr;
+} __attribute__((packed));
+
+/* the l1_info_ul header is in front */
+struct l1ctl_rach_req {
+	uint8_t ra;
+	uint8_t combined;
+	uint16_t offset;
+} __attribute__((packed));
+
+
+/* the l1_info_ul header is in front */
+struct l1ctl_ext_rach_req {
+	uint16_t ra11;
+	uint8_t synch_seq;
+	uint8_t combined;
+	uint16_t offset;
+} __attribute__((packed));
+
+/* the l1_info_ul header is in front */
+struct l1ctl_par_req {
+	int8_t ta;
+	uint8_t tx_power;
+	uint8_t padding[2];
+} __attribute__((packed));
+
+struct l1ctl_h0 {
+	uint16_t band_arfcn;
+} __attribute__((packed));
+
+struct l1ctl_h1 {
+	uint8_t hsn;
+	uint8_t maio;
+	uint8_t n;
+	uint8_t _padding[1];
+	uint16_t ma[64];
+} __attribute__((packed));
+
+struct l1ctl_dm_est_req {
+	uint8_t tsc;
+	uint8_t h;
+	union {
+		struct l1ctl_h0 h0;
+		struct l1ctl_h1 h1;
+	};
+	uint8_t tch_mode;
+	uint8_t audio_mode;
+} __attribute__((packed));
+
+struct l1ctl_dm_freq_req {
+	uint16_t fn;
+	uint8_t tsc;
+	uint8_t h;
+	union {
+		struct l1ctl_h0 h0;
+		struct l1ctl_h1 h1;
+	};
+} __attribute__((packed));
+
+struct l1ctl_crypto_req {
+	uint8_t algo;
+	uint8_t key_len;
+	uint8_t key[0];
+} __attribute__((packed));
+
+struct l1ctl_pm_req {
+	uint8_t type;
+	uint8_t padding[3];
+
+	union {
+		struct {
+			uint16_t band_arfcn_from;
+			uint16_t band_arfcn_to;
+		} range;
+	};
+} __attribute__((packed));
+
+#define BI_FLG_DUMMY (1 << 4)
+#define BI_FLG_SACCH (1 << 5)
+
+struct l1ctl_burst_ind {
+	uint32_t frame_nr;
+	uint16_t band_arfcn;    /* ARFCN + band + ul indicator               */
+	uint8_t chan_nr;        /* GSM 08.58 channel number (9.3.1)          */
+	uint8_t flags;          /* BI_FLG_xxx + burst_id = 2LSBs             */
+	uint8_t rx_level;       /* 0 .. 63 in typical GSM notation (dBm+110) */
+	uint8_t snr;            /* Reported SNR >> 8 (0-255)                 */
+	uint8_t bits[15];       /* 114 bits + 2 steal bits. Filled MSB first */
+} __attribute__((packed));
+
+/* a single L1CTL_PM response */
+struct l1ctl_pm_conf {
+	uint16_t band_arfcn;
+	uint8_t pm[2];
+} __attribute__((packed));
+
+enum l1ctl_reset_type {
+	L1CTL_RES_T_BOOT,	/* only _IND */
+	L1CTL_RES_T_FULL,
+	L1CTL_RES_T_SCHED,
+};
+
+/* argument to L1CTL_RESET_REQ and L1CTL_RESET_IND */
+struct l1ctl_reset {
+	uint8_t type;
+	uint8_t pad[3];
+} __attribute__((packed));
+
+struct l1ctl_neigh_pm_req {
+	uint8_t n;
+	uint8_t padding[1];
+	uint16_t band_arfcn[64];
+	uint8_t tn[64];
+} __attribute__((packed));
+
+/* neighbour cell measurement results */
+struct l1ctl_neigh_pm_ind {
+	uint16_t band_arfcn;
+	uint8_t pm[2];
+	uint8_t tn;
+	uint8_t padding;
+} __attribute__((packed));
+
+/* traffic data to network */
+struct l1ctl_traffic_req {
+	uint8_t data[0];
+} __attribute__((packed));
+
+struct l1ctl_tbf_cfg_req {
+	/* future support for multiple concurrent TBFs. 0 for now */
+	uint8_t tbf_nr;
+	/* is this about an UL TBF (1) or DL (0) */
+	uint8_t is_uplink;
+	uint8_t padding[2];
+
+	/* one USF for each TN, or 255 for invalid/unused */
+	uint8_t usf[8];
+} __attribute__((packed));
+
+#endif /* __L1CTL_PROTO_H__ */

trxcon/include/osmocom/bb/trxcon/l1ctl_server.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <stdint.h>
+
+#include <osmocom/core/write_queue.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/msgb.h>
+
+#define L1CTL_LENGTH 256
+#define L1CTL_HEADROOM 32
+
+/**
+ * Each L1CTL message gets its own length pushed
+ * as two bytes in front before sending.
+ */
+#define L1CTL_MSG_LEN_FIELD 2
+
+struct l1ctl_client;
+
+typedef int l1ctl_conn_data_func(struct l1ctl_client *, struct msgb *);
+typedef void l1ctl_conn_state_func(struct l1ctl_client *);
+
+struct l1ctl_server_cfg {
+	/* UNIX socket path to listen on */
+	const char *sock_path;
+	/* maximum number of connected clients */
+	unsigned int num_clients_max;
+	/* functions to be called on various events */
+	l1ctl_conn_data_func *conn_read_cb;	/* mandatory */
+	l1ctl_conn_state_func *conn_accept_cb;	/* optional */
+	l1ctl_conn_state_func *conn_close_cb;	/* optional */
+};
+
+struct l1ctl_server {
+	/* list of connected clients */
+	struct llist_head clients;
+	/* number of connected clients */
+	unsigned int num_clients;
+	/* used for client ID generation */
+	unsigned int next_client_id;
+	/* socket on which we listen for connections */
+	struct osmo_fd ofd;
+	/* server configuration */
+	const struct l1ctl_server_cfg *cfg;
+};
+
+struct l1ctl_client {
+	/* list head in l1ctl_server.clients */
+	struct llist_head list;
+	/* struct l1ctl_server we belong to */
+	struct l1ctl_server *server;
+	/* client's write queue */
+	struct osmo_wqueue wq;
+	/* logging context (used as prefix for messages) */
+	const char *log_prefix;
+	/* unique client ID */
+	unsigned int id;
+	/* some private data */
+	void *priv;
+};
+
+struct l1ctl_server *l1ctl_server_alloc(void *ctx, const struct l1ctl_server_cfg *cfg);
+void l1ctl_server_free(struct l1ctl_server *server);
+
+int l1ctl_client_send(struct l1ctl_client *client, struct msgb *msg);
+void l1ctl_client_conn_close(struct l1ctl_client *client);

trxcon/include/osmocom/bb/trxcon/logging.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <osmocom/core/logging.h>
+
+enum {
+	DAPP,
+	DL1C,
+	DL1D,
+	DTRXC,
+	DTRXD,
+	DSCH,
+	DSCHD,
+};
+
+int trx_log_init(void *tall_ctx, const char *category_mask);

trxcon/include/osmocom/bb/trxcon/sched_utils.h

@@ -0,0 +1,62 @@
+/* Auxiliary scheduler utilities.
+ *
+ * (C) 2017 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <errno.h>
+#include <stdbool.h>
+
+/*! determine whether an uplink AMR block is CMI according to 3GPP TS 45.009.
+ *  \param[in] fn_begin frame number of the beginning of the block.
+ *  \returns true in case of CMI; false otherwise. */
+static inline bool ul_amr_fn_is_cmi(uint32_t fn_begin)
+{
+	switch (fn_begin % 26) {
+		/*! See also: 3GPP TS 45.009, section 3.2.1.3 Transmitter/Receiver Synchronisation */
+		/* valid for AHS subslot 0 and AFS: */
+	case 0:
+	case 8:
+	case 17:
+		/* valid for AHS subslot 1: */
+	case 1:
+	case 9:
+	case 18:
+		return true;
+		break;
+		/* Complementary values for sanity check */
+		/* valid for AHS subslot 0 and AFS: */
+	case 4:
+	case 13:
+	case 21:
+		/* valid for AHS subslot 1: */
+	case 5:
+	case 14:
+	case 22:
+		return false;
+		break;
+	default:
+		OSMO_ASSERT(false);
+		return false;
+		break;
+	}
+}

trxcon/include/osmocom/bb/trxcon/trx_if.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/fsm.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+
+#define TRXC_BUF_SIZE	1024
+#define TRXD_BUF_SIZE	512
+
+/* Forward declaration to avoid mutual include */
+struct l1sched_burst_req;
+struct trxcon_inst;
+
+enum trx_fsm_states {
+	TRX_STATE_OFFLINE = 0,
+	TRX_STATE_IDLE,
+	TRX_STATE_ACTIVE,
+	TRX_STATE_RSP_WAIT,
+};
+
+struct trx_instance {
+	/* trxcon instance we belong to */
+	struct trxcon_inst *trxcon;
+
+	struct osmo_fd trx_ofd_ctrl;
+	struct osmo_fd trx_ofd_data;
+
+	struct osmo_timer_list trx_ctrl_timer;
+	struct llist_head trx_ctrl_list;
+	struct osmo_fsm_inst *fi;
+
+	/* HACK: we need proper state machines */
+	uint32_t prev_state;
+	bool powered_up;
+
+	/* GSM L1 specific */
+	uint16_t pm_band_arfcn_start;
+	uint16_t pm_band_arfcn_stop;
+};
+
+struct trx_ctrl_msg {
+	struct llist_head list;
+	char cmd[TRXC_BUF_SIZE];
+	int retry_cnt;
+	int critical;
+	int cmd_len;
+};
+
+struct trx_instance *trx_if_open(struct trxcon_inst *trxcon,
+	const char *local_host, const char *remote_host, uint16_t port);
+void trx_if_flush_ctrl(struct trx_instance *trx);
+void trx_if_close(struct trx_instance *trx);
+
+int trx_if_cmd_poweron(struct trx_instance *trx);
+int trx_if_cmd_poweroff(struct trx_instance *trx);
+int trx_if_cmd_echo(struct trx_instance *trx);
+
+int trx_if_cmd_setta(struct trx_instance *trx, int8_t ta);
+
+int trx_if_cmd_rxtune(struct trx_instance *trx, uint16_t band_arfcn);
+int trx_if_cmd_txtune(struct trx_instance *trx, uint16_t band_arfcn);
+
+int trx_if_cmd_setslot(struct trx_instance *trx, uint8_t tn,
+		       enum gsm_phys_chan_config pchan);
+int trx_if_cmd_setfh(struct trx_instance *trx, uint8_t hsn, uint8_t maio,
+		     const uint16_t *ma, size_t ma_len);
+
+int trx_if_cmd_measure(struct trx_instance *trx,
+	uint16_t band_arfcn_start, uint16_t band_arfcn_stop);
+
+int trx_if_tx_burst(struct trx_instance *trx,
+		    const struct l1sched_burst_req *br);
+int trx_if_cmd_sync(struct trx_instance *trx);

trxcon/include/osmocom/bb/trxcon/trxcon.h

@@ -0,0 +1,169 @@
+#pragma once
+
+struct l1sched_state;
+
+extern struct osmo_fsm trxcon_fsm_def;
+
+enum trxcon_fsm_states {
+	TRXCON_ST_RESET,
+	TRXCON_ST_FULL_POWER_SCAN,
+	TRXCON_ST_FBSB_SEARCH,
+	TRXCON_ST_BCCH_CCCH,
+	TRXCON_ST_DEDICATED,
+	TRXCON_ST_PACKET_DATA,
+};
+
+enum trxcon_fsm_events {
+	TRXCON_EV_PHYIF_FAILURE,
+	TRXCON_EV_L2IF_FAILURE,
+	TRXCON_EV_RESET_FULL_REQ,
+	TRXCON_EV_RESET_SCHED_REQ,
+	TRXCON_EV_FULL_POWER_SCAN_REQ,
+	TRXCON_EV_FULL_POWER_SCAN_RES,
+	TRXCON_EV_FBSB_SEARCH_REQ,
+	TRXCON_EV_FBSB_SEARCH_RES,
+	TRXCON_EV_SET_CCCH_MODE_REQ,
+	TRXCON_EV_SET_TCH_MODE_REQ,
+	TRXCON_EV_SET_PHY_CONFIG_REQ,
+	TRXCON_EV_TX_ACCESS_BURST_REQ,
+	TRXCON_EV_UPDATE_SACCH_CACHE_REQ,
+	TRXCON_EV_DEDICATED_ESTABLISH_REQ,
+	TRXCON_EV_DEDICATED_RELEASE_REQ,
+	TRXCON_EV_TX_TRAFFIC_REQ,
+	TRXCON_EV_RX_TRAFFIC_IND,
+	TRXCON_EV_TX_DATA_REQ,
+	TRXCON_EV_RX_DATA_IND,
+	TRXCON_EV_CRYPTO_REQ,
+};
+
+/* param of TRXCON_EV_FULL_POWER_SCAN_REQ */
+struct trxcon_param_full_power_scan_req {
+	uint16_t band_arfcn_start;
+	uint16_t band_arfcn_stop;
+};
+
+/* param of TRXCON_EV_FULL_POWER_SCAN_RES */
+struct trxcon_param_full_power_scan_res {
+	bool last_result;
+	uint16_t band_arfcn;
+	int dbm;
+};
+
+/* param of TRXCON_EV_FBSB_SEARCH_REQ */
+struct trxcon_param_fbsb_search_req {
+	uint16_t band_arfcn;
+	uint16_t timeout_ms;
+	uint8_t pchan_config;
+};
+
+/* param of TRXCON_EV_SET_{CCCH,TCH}_MODE_REQ */
+struct trxcon_param_set_ccch_tch_mode_req {
+	uint8_t mode;
+	struct {
+		uint8_t start_codec;
+		uint8_t codecs_bitmask;
+	} amr;
+	bool applied;
+};
+
+/* param of TRXCON_EV_SET_PHY_CONFIG_REQ */
+struct trxcon_param_set_phy_config_req {
+	enum {
+		TRXCON_PHY_CFGT_PCHAN_COMB,
+		TRXCON_PHY_CFGT_TX_PARAMS,
+	} type;
+	union {
+		struct {
+			uint8_t tn;
+			uint8_t pchan;
+		} pchan_comb;
+		struct {
+			uint8_t timing_advance;
+			uint8_t tx_power;
+		} tx_params;
+	};
+};
+
+/* param of TRXCON_EV_TX_{TRAFFIC,DATA}_REQ */
+struct trxcon_param_tx_traffic_data_req {
+	uint8_t chan_nr;
+	uint8_t link_id;
+	size_t data_len;
+	const uint8_t *data;
+};
+
+/* param of TRXCON_EV_RX_{TRAFFIC,DATA}_IND */
+struct trxcon_param_rx_traffic_data_ind {
+	uint8_t chan_nr;
+	uint8_t link_id;
+	uint32_t frame_nr;
+	int16_t toa256;
+	int8_t rssi;
+	int n_errors;
+	int n_bits_total;
+	size_t data_len;
+	const uint8_t *data;
+};
+
+/* param of TRXCON_EV_TX_ACCESS_BURST_REQ */
+struct trxcon_param_tx_access_burst_req {
+	uint8_t chan_nr;
+	uint8_t link_id;
+	uint8_t offset;
+	uint8_t synch_seq;
+	uint16_t ra;
+	bool is_11bit;
+};
+
+/* param of TRXCON_EV_DEDICATED_ESTABLISH_REQ */
+struct trxcon_param_dedicated_establish_req {
+	uint8_t chan_nr;
+	uint8_t tch_mode;
+	uint8_t tsc;
+
+	bool hopping;
+	union {
+		struct { /* hopping=false */
+			uint16_t band_arfcn;
+		} h0;
+		struct { /* hopping=true */
+			uint8_t hsn;
+			uint8_t maio;
+			uint8_t n;
+			uint16_t ma[64];
+		} h1;
+	};
+};
+
+/* param of TRXCON_EV_CRYPTO_REQ */
+struct trxcon_param_crypto_req {
+	uint8_t chan_nr;
+	uint8_t a5_algo; /* 0 is A5/0 */
+	uint8_t key_len;
+	const uint8_t *key;
+};
+
+struct trxcon_inst {
+	struct osmo_fsm_inst *fi;
+	unsigned int id;
+
+	/* Logging context for sched and l1c */
+	const char *log_prefix;
+
+	/* The L1 scheduler */
+	struct l1sched_state *sched;
+	/* PHY interface (e.g. TRXC/TRXD) */
+	void *phyif;
+	/* L2 interface (e.g. L1CTL) */
+	void *l2if;
+
+	/* L1 parameters */
+	struct {
+		uint16_t band_arfcn;
+		uint8_t tx_power;
+		int8_t ta;
+	} l1p;
+};
+
+struct trxcon_inst *trxcon_inst_alloc(void *ctx, unsigned int id);
+void trxcon_inst_free(struct trxcon_inst *trxcon);

trxcon/src/Makefile.am

@@ -0,0 +1,58 @@
+include $(top_srcdir)/Makefile.common
+
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOCODING_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(NULL)
+
+
+AM_CPPFLAGS = $(STD_DEFINES_AND_INCLUDES)
+AM_CXXFLAGS = -Wall -O3 -g -ldl -lpthread
+
+noinst_LTLIBRARIES = libl1sched.la
+
+libl1sched_la_SOURCES = \
+	sched_lchan_common.c \
+	sched_lchan_pdtch.c \
+	sched_lchan_desc.c \
+	sched_lchan_xcch.c \
+	sched_lchan_tchf.c \
+	sched_lchan_tchh.c \
+	sched_lchan_rach.c \
+	sched_lchan_sch.c \
+	sched_mframe.c \
+	sched_clck.c \
+	sched_prim.c \
+	sched_trx.c \
+	$(NULL)
+
+libl1sched_la_LIBADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOCODING_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)
+
+
+noinst_LTLIBRARIES = libtrxcon.la 
+
+libtrxcon_SOURCES = \
+	l1ctl_server.c \
+	l1ctl.c \
+	trx_if.c \
+	logging.c \
+	trxcon_fsm.c \
+	trxcon.c \
+	$(NULL)
+
+libtrxcon_LDADD = \
+	libl1sched.la \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)

trxcon/src/l1ctl.c

@@ -0,0 +1,807 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * GSM L1 control interface handlers
+ *
+ * (C) 2014 by Sylvain Munaut <tnt@246tNt.com>
+ * (C) 2016-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+#include <arpa/inet.h>
+
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+
+#include <osmocom/gsm/gsm0502.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/protocol/gsm_08_58.h>
+
+#include <osmocom/bb/trxcon/logging.h>
+#include <osmocom/bb/trxcon/l1ctl_server.h>
+#include <osmocom/bb/trxcon/l1ctl_proto.h>
+#include <osmocom/bb/trxcon/trxcon.h>
+
+static const char *arfcn2band_name(uint16_t arfcn)
+{
+	enum gsm_band band;
+
+	if (gsm_arfcn2band_rc(arfcn, &band) < 0)
+		return "(invalid)";
+
+	return gsm_band_name(band);
+}
+
+static struct msgb *l1ctl_alloc_msg(uint8_t msg_type)
+{
+	struct l1ctl_hdr *l1h;
+	struct msgb *msg;
+
+	/**
+	 * Each L1CTL message gets its own length pushed in front
+	 * before sending. This is why we need this small headroom.
+	 */
+	msg = msgb_alloc_headroom(L1CTL_LENGTH + L1CTL_MSG_LEN_FIELD,
+		L1CTL_MSG_LEN_FIELD, "l1ctl_tx_msg");
+	if (!msg) {
+		LOGP(DL1C, LOGL_ERROR, "Failed to allocate memory\n");
+		return NULL;
+	}
+
+	msg->l1h = msgb_put(msg, sizeof(*l1h));
+	l1h = (struct l1ctl_hdr *) msg->l1h;
+	l1h->msg_type = msg_type;
+
+	return msg;
+}
+
+int l1ctl_tx_pm_conf(struct l1ctl_client *l1c, uint16_t band_arfcn,
+	int dbm, int last)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_pm_conf *pmc;
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(L1CTL_PM_CONF);
+	if (!msg)
+		return -ENOMEM;
+
+	LOGPFSMSL(fi, DL1C, LOGL_DEBUG,
+		  "Send PM Conf (%s %d = %d dBm)\n",
+		  arfcn2band_name(band_arfcn),
+		  band_arfcn & ~ARFCN_FLAG_MASK, dbm);
+
+	pmc = (struct l1ctl_pm_conf *) msgb_put(msg, sizeof(*pmc));
+	pmc->band_arfcn = htons(band_arfcn);
+	pmc->pm[0] = dbm2rxlev(dbm);
+	pmc->pm[1] = 0;
+
+	if (last) {
+		struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->l1h;
+		l1h->flags |= L1CTL_F_DONE;
+	}
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+int l1ctl_tx_reset_ind(struct l1ctl_client *l1c, uint8_t type)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct msgb *msg;
+	struct l1ctl_reset *res;
+
+	msg = l1ctl_alloc_msg(L1CTL_RESET_IND);
+	if (!msg)
+		return -ENOMEM;
+
+	LOGPFSMSL(fi, DL1C, LOGL_DEBUG, "Send Reset Ind (%u)\n", type);
+
+	res = (struct l1ctl_reset *) msgb_put(msg, sizeof(*res));
+	res->type = type;
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+int l1ctl_tx_reset_conf(struct l1ctl_client *l1c, uint8_t type)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct msgb *msg;
+	struct l1ctl_reset *res;
+
+	msg = l1ctl_alloc_msg(L1CTL_RESET_CONF);
+	if (!msg)
+		return -ENOMEM;
+
+	LOGPFSMSL(fi, DL1C, LOGL_DEBUG, "Send Reset Conf (%u)\n", type);
+	res = (struct l1ctl_reset *) msgb_put(msg, sizeof(*res));
+	res->type = type;
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+static struct l1ctl_info_dl *put_dl_info_hdr(struct msgb *msg,
+					     const struct l1ctl_info_dl *dl_info)
+{
+	size_t len = sizeof(struct l1ctl_info_dl);
+	struct l1ctl_info_dl *dl = (struct l1ctl_info_dl *) msgb_put(msg, len);
+
+	if (dl_info) /* Copy DL info provided by handler */
+		memcpy(dl, dl_info, len);
+	else /* Init DL info header */
+		memset(dl, 0x00, len);
+
+	return dl;
+}
+
+/* Fill in FBSB payload: BSIC and sync result */
+static struct l1ctl_fbsb_conf *fbsb_conf_make(struct msgb *msg, uint8_t result, uint8_t bsic)
+{
+	struct l1ctl_fbsb_conf *conf = (struct l1ctl_fbsb_conf *) msgb_put(msg, sizeof(*conf));
+
+	conf->result = result;
+	conf->bsic = bsic;
+
+	return conf;
+}
+
+int l1ctl_tx_fbsb_fail(struct l1ctl_client *l1c, uint16_t band_arfcn)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_info_dl *dl;
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(L1CTL_FBSB_CONF);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	dl = put_dl_info_hdr(msg, NULL);
+
+	/* Fill in current ARFCN */
+	dl->band_arfcn = htons(band_arfcn);
+
+	fbsb_conf_make(msg, 255, 0);
+
+	LOGPFSMSL(fi, DL1C, LOGL_DEBUG, "Send FBSB Conf (timeout)\n");
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+int l1ctl_tx_fbsb_conf(struct l1ctl_client *l1c, uint16_t band_arfcn, uint8_t bsic)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_fbsb_conf *conf;
+	struct l1ctl_info_dl *dl;
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(L1CTL_FBSB_CONF);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	dl = put_dl_info_hdr(msg, NULL);
+
+	/* Fill in current ARFCN */
+	dl->band_arfcn = htons(band_arfcn);
+
+	conf = fbsb_conf_make(msg, 0, bsic);
+
+	/* FIXME: set proper value */
+	conf->initial_freq_err = 0;
+
+	LOGPFSMSL(fi, DL1C, LOGL_DEBUG,
+		  "Send FBSB Conf (result=%u, bsic=%u)\n",
+		  conf->result, conf->bsic);
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+int l1ctl_tx_ccch_mode_conf(struct l1ctl_client *l1c, uint8_t mode)
+{
+	struct l1ctl_ccch_mode_conf *conf;
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(L1CTL_CCCH_MODE_CONF);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	conf = (struct l1ctl_ccch_mode_conf *) msgb_put(msg, sizeof(*conf));
+	conf->ccch_mode = mode;
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+/**
+ * Handles both L1CTL_DATA_IND and L1CTL_TRAFFIC_IND.
+ */
+int l1ctl_tx_dt_ind(struct l1ctl_client *l1c,
+		    const struct l1ctl_info_dl *dl_info,
+		    const uint8_t *l2, size_t l2_len,
+		    bool traffic)
+{
+	struct msgb *msg;
+	uint8_t *msg_l2;
+
+	msg = l1ctl_alloc_msg(traffic ?
+		L1CTL_TRAFFIC_IND : L1CTL_DATA_IND);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	put_dl_info_hdr(msg, dl_info);
+
+	/* Copy the L2 payload if preset */
+	if (l2 && l2_len > 0) {
+		msg_l2 = (uint8_t *) msgb_put(msg, l2_len);
+		memcpy(msg_l2, l2, l2_len);
+	}
+
+	/* Put message to upper layers */
+	return l1ctl_client_send(l1c, msg);
+}
+
+int l1ctl_tx_rach_conf(struct l1ctl_client *l1c,
+	uint16_t band_arfcn, uint32_t fn)
+{
+	struct l1ctl_info_dl *dl;
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(L1CTL_RACH_CONF);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	dl = put_dl_info_hdr(msg, NULL);
+	memset(dl, 0x00, sizeof(*dl));
+
+	dl->band_arfcn = htons(band_arfcn);
+	dl->frame_nr = htonl(fn);
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+
+/**
+ * Handles both L1CTL_DATA_CONF and L1CTL_TRAFFIC_CONF.
+ */
+int l1ctl_tx_dt_conf(struct l1ctl_client *l1c,
+	struct l1ctl_info_dl *data, bool traffic)
+{
+	struct msgb *msg;
+
+	msg = l1ctl_alloc_msg(traffic ?
+		L1CTL_TRAFFIC_CONF : L1CTL_DATA_CONF);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	/* Copy DL frame header from source message */
+	put_dl_info_hdr(msg, data);
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+static enum gsm_phys_chan_config l1ctl_ccch_mode2pchan_config(enum ccch_mode mode)
+{
+	switch (mode) {
+	/* TODO: distinguish extended BCCH */
+	case CCCH_MODE_NON_COMBINED:
+	case CCCH_MODE_NONE:
+		return GSM_PCHAN_CCCH;
+
+	case CCCH_MODE_COMBINED:
+		return GSM_PCHAN_CCCH_SDCCH4;
+	case CCCH_MODE_COMBINED_CBCH:
+		return GSM_PCHAN_CCCH_SDCCH4_CBCH;
+
+	default:
+		LOGP(DL1C, LOGL_NOTICE, "Undandled CCCH mode (%u), "
+			"assuming non-combined configuration\n", mode);
+		return GSM_PCHAN_CCCH;
+	}
+}
+
+static int l1ctl_rx_fbsb_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_fbsb_req *fbsb;
+	int rc = 0;
+
+	fbsb = (struct l1ctl_fbsb_req *) msg->l1h;
+	if (msgb_l1len(msg) < sizeof(*fbsb)) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "MSG too short FBSB Req: %u\n",
+			  msgb_l1len(msg));
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	struct trxcon_param_fbsb_search_req req = {
+		.pchan_config = l1ctl_ccch_mode2pchan_config(fbsb->ccch_mode),
+		.timeout_ms = 2000,
+		.band_arfcn = ntohs(fbsb->band_arfcn),
+	};
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received FBSB request (%s %d, timeout %u ms)\n",
+		  arfcn2band_name(req.band_arfcn),
+		  req.band_arfcn & ~ARFCN_FLAG_MASK,
+		  req.timeout_ms);
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_FBSB_SEARCH_REQ, &req);
+
+exit:
+	msgb_free(msg);
+	return rc;
+}
+
+static int l1ctl_rx_pm_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_pm_req *pmr;
+	int rc = 0;
+
+	pmr = (struct l1ctl_pm_req *) msg->l1h;
+	if (msgb_l1len(msg) < sizeof(*pmr)) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "MSG too short PM Req: %u\n",
+			  msgb_l1len(msg));
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	struct trxcon_param_full_power_scan_req req = {
+		.band_arfcn_start = ntohs(pmr->range.band_arfcn_from),
+		.band_arfcn_stop = ntohs(pmr->range.band_arfcn_to),
+	};
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received power measurement request (%s: %d -> %d)\n",
+		  arfcn2band_name(req.band_arfcn_start),
+		  req.band_arfcn_start & ~ARFCN_FLAG_MASK,
+		  req.band_arfcn_stop & ~ARFCN_FLAG_MASK);
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_FULL_POWER_SCAN_REQ, &req);
+
+exit:
+	msgb_free(msg);
+	return rc;
+}
+
+static int l1ctl_rx_reset_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_reset *res;
+	int rc = 0;
+
+	res = (struct l1ctl_reset *) msg->l1h;
+	if (msgb_l1len(msg) < sizeof(*res)) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "MSG too short Reset Req: %u\n",
+			  msgb_l1len(msg));
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received reset request (%u)\n", res->type);
+
+	switch (res->type) {
+	case L1CTL_RES_T_FULL:
+		osmo_fsm_inst_dispatch(fi, TRXCON_EV_RESET_FULL_REQ, NULL);
+		break;
+	case L1CTL_RES_T_SCHED:
+		osmo_fsm_inst_dispatch(fi, TRXCON_EV_RESET_SCHED_REQ, NULL);
+		break;
+	default:
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "Unknown L1CTL_RESET_REQ type\n");
+		goto exit;
+	}
+
+	/* Confirm */
+	rc = l1ctl_tx_reset_conf(l1c, res->type);
+
+exit:
+	msgb_free(msg);
+	return rc;
+}
+
+static int l1ctl_rx_echo_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_hdr *l1h;
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE, "Recv Echo Req\n");
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE, "Send Echo Conf\n");
+
+	/* Nothing to do, just send it back */
+	l1h = (struct l1ctl_hdr *) msg->l1h;
+	l1h->msg_type = L1CTL_ECHO_CONF;
+	msg->data = msg->l1h;
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+static int l1ctl_rx_ccch_mode_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_ccch_mode_req *mode_req;
+	int rc;
+
+	mode_req = (struct l1ctl_ccch_mode_req *)msg->l1h;
+	if (msgb_l1len(msg) < sizeof(*mode_req)) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "MSG too short Reset Req: %u\n",
+			  msgb_l1len(msg));
+		rc = -EINVAL;
+		goto exit;
+	}
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE, "Received CCCH mode request (%u)\n",
+		  mode_req->ccch_mode); /* TODO: add value-string for ccch_mode */
+
+	struct trxcon_param_set_ccch_tch_mode_req req = {
+		/* Choose corresponding channel combination */
+		.mode = l1ctl_ccch_mode2pchan_config(mode_req->ccch_mode),
+	};
+
+	rc = osmo_fsm_inst_dispatch(fi, TRXCON_EV_SET_CCCH_MODE_REQ, &req);
+	if (rc == 0 && req.applied)
+		l1ctl_tx_ccch_mode_conf(l1c, mode_req->ccch_mode);
+
+exit:
+	msgb_free(msg);
+	return rc;
+}
+
+static int l1ctl_rx_rach_req(struct l1ctl_client *l1c, struct msgb *msg, bool is_11bit)
+{
+	struct trxcon_param_tx_access_burst_req req;
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_info_ul *ul;
+
+	ul = (struct l1ctl_info_ul *) msg->l1h;
+
+	if (is_11bit) {
+		const struct l1ctl_ext_rach_req *rr = (void *)ul->payload;
+
+		req = (struct trxcon_param_tx_access_burst_req) {
+			.offset = ntohs(rr->offset),
+			.synch_seq = rr->synch_seq,
+			.ra = ntohs(rr->ra11),
+			.is_11bit = true,
+		};
+
+		LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+			  "Received 11-bit RACH request "
+			  "(offset=%u, synch_seq=%u, ra11=0x%02hx)\n",
+			  req.offset, req.synch_seq, req.ra);
+	} else {
+		const struct l1ctl_rach_req *rr = (void *)ul->payload;
+
+		req = (struct trxcon_param_tx_access_burst_req) {
+			.offset = ntohs(rr->offset),
+			.ra = rr->ra,
+		};
+
+		LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+			  "Received 8-bit RACH request "
+			  "(offset=%u, ra=0x%02x)\n", req.offset, req.ra);
+	}
+
+	/* The controlling L1CTL side always does include the UL info header,
+	 * but may leave it empty. We assume RACH is on TS0 in this case. */
+	if (ul->chan_nr == 0x00) {
+		LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+			  "The UL info header is empty, assuming RACH is on TS0\n");
+		req.chan_nr = RSL_CHAN_RACH;
+		req.link_id = 0x00;
+	} else {
+		req.chan_nr = ul->chan_nr;
+		req.link_id = ul->link_id;
+	}
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_TX_ACCESS_BURST_REQ, &req);
+
+	msgb_free(msg);
+	return 0;
+}
+
+static int l1ctl_proc_est_req_h0(struct osmo_fsm_inst *fi,
+				 struct trxcon_param_dedicated_establish_req *req,
+				 const struct l1ctl_h0 *h)
+{
+	req->h0.band_arfcn = ntohs(h->band_arfcn);
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "L1CTL_DM_EST_REQ indicates single ARFCN %s %u\n",
+		  arfcn2band_name(req->h0.band_arfcn),
+		  req->h0.band_arfcn & ~ARFCN_FLAG_MASK);
+
+	return 0;
+}
+
+static int l1ctl_proc_est_req_h1(struct osmo_fsm_inst *fi,
+				 struct trxcon_param_dedicated_establish_req *req,
+				 const struct l1ctl_h1 *h)
+{
+	unsigned int i;
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "L1CTL_DM_EST_REQ indicates a Frequency "
+		  "Hopping (hsn=%u, maio=%u, chans=%u) channel\n",
+		  h->hsn, h->maio, h->n);
+
+	/* No channels?!? */
+	if (!h->n) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "No channels in mobile allocation?!?\n");
+		return -EINVAL;
+	} else if (h->n > ARRAY_SIZE(h->ma)) {
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR,
+			  "More than 64 channels in mobile allocation?!?\n");
+		return -EINVAL;
+	}
+
+	/* Convert from network to host byte order */
+	for (i = 0; i < h->n; i++)
+		req->h1.ma[i] = ntohs(h->ma[i]);
+	req->h1.n = h->n;
+	req->h1.hsn = h->hsn;
+	req->h1.maio = h->maio;
+
+	return 0;
+}
+
+static int l1ctl_rx_dm_est_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_dm_est_req *est_req;
+	struct l1ctl_info_ul *ul;
+	int rc;
+
+	ul = (struct l1ctl_info_ul *) msg->l1h;
+	est_req = (struct l1ctl_dm_est_req *) ul->payload;
+
+	struct trxcon_param_dedicated_establish_req req = {
+		.chan_nr = ul->chan_nr,
+		.tch_mode = est_req->tch_mode,
+		.tsc = est_req->tsc,
+		.hopping = est_req->h,
+	};
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received L1CTL_DM_EST_REQ "
+		  "(tn=%u, chan_nr=0x%02x, tsc=%u, tch_mode=0x%02x)\n",
+		  req.chan_nr & 0x07, req.chan_nr, req.tsc, req.tch_mode);
+
+	/* Frequency hopping? */
+	if (est_req->h)
+		rc = l1ctl_proc_est_req_h1(fi, &req, &est_req->h1);
+	else /* Single ARFCN */
+		rc = l1ctl_proc_est_req_h0(fi, &req, &est_req->h0);
+	if (rc)
+		goto exit;
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_DEDICATED_ESTABLISH_REQ, &req);
+
+exit:
+	msgb_free(msg);
+	return rc;
+}
+
+static int l1ctl_rx_dm_rel_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE, "Received L1CTL_DM_REL_REQ\n");
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_DEDICATED_RELEASE_REQ, NULL);
+
+	msgb_free(msg);
+	return 0;
+}
+
+/**
+ * Handles both L1CTL_DATA_REQ and L1CTL_TRAFFIC_REQ.
+ */
+static int l1ctl_rx_dt_req(struct l1ctl_client *l1c,
+	struct msgb *msg, bool traffic)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_info_ul *ul;
+
+	/* Extract UL frame header */
+	ul = (struct l1ctl_info_ul *) msg->l1h;
+	msg->l2h = ul->payload;
+
+	struct trxcon_param_tx_traffic_data_req req = {
+		.chan_nr = ul->chan_nr,
+		.link_id = ul->link_id & 0x40,
+		.data_len = msgb_l2len(msg),
+		.data = ul->payload,
+	};
+
+	LOGPFSMSL(fi, DL1D, LOGL_DEBUG,
+		  "Recv %s Req (chan_nr=0x%02x, link_id=0x%02x, len=%zu)\n",
+		  traffic ? "TRAFFIC" : "DATA", req.chan_nr, req.link_id, req.data_len);
+
+	switch (fi->state) {
+	case TRXCON_ST_DEDICATED:
+		if (traffic)
+			osmo_fsm_inst_dispatch(fi, TRXCON_EV_TX_TRAFFIC_REQ, &req);
+		else
+			osmo_fsm_inst_dispatch(fi, TRXCON_EV_TX_DATA_REQ, &req);
+		break;
+	default:
+		if (!traffic && req.link_id == 0x40) /* only for SACCH */
+			osmo_fsm_inst_dispatch(fi, TRXCON_EV_UPDATE_SACCH_CACHE_REQ, &req);
+		/* TODO: log an error about uhnandled DATA.req / TRAFFIC.req */
+	}
+
+	msgb_free(msg);
+	return 0;
+}
+
+static int l1ctl_rx_param_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_par_req *par_req;
+	struct l1ctl_info_ul *ul;
+
+	ul = (struct l1ctl_info_ul *) msg->l1h;
+	par_req = (struct l1ctl_par_req *) ul->payload;
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received L1CTL_PARAM_REQ (ta=%d, tx_power=%u)\n",
+		  par_req->ta, par_req->tx_power);
+
+	struct trxcon_param_set_phy_config_req req = {
+		.type = TRXCON_PHY_CFGT_TX_PARAMS,
+		.tx_params = {
+			.timing_advance = par_req->ta,
+			.tx_power = par_req->tx_power,
+		}
+	};
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_SET_PHY_CONFIG_REQ, &req);
+
+	msgb_free(msg);
+	return 0;
+}
+
+static int l1ctl_rx_tch_mode_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_tch_mode_req *mode_req;
+	int rc;
+
+	mode_req = (struct l1ctl_tch_mode_req *)msg->l1h;
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "Received L1CTL_TCH_MODE_REQ (tch_mode=%u, audio_mode=%u)\n",
+		  mode_req->tch_mode, mode_req->audio_mode);
+
+	/* TODO: do we need to care about audio_mode? */
+
+	struct trxcon_param_set_ccch_tch_mode_req req = {
+		.mode = mode_req->tch_mode,
+	};
+	if (mode_req->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+		req.amr.start_codec = mode_req->amr.start_codec;
+		req.amr.codecs_bitmask = mode_req->amr.codecs_bitmask;
+	}
+
+	rc = osmo_fsm_inst_dispatch(fi, TRXCON_EV_SET_TCH_MODE_REQ, &req);
+	if (rc != 0 || !req.applied) {
+		talloc_free(msg);
+		return rc;
+	}
+
+	/* Re-use the original message as confirmation */
+	struct l1ctl_hdr *l1h = (struct l1ctl_hdr *) msg->data;
+	l1h->msg_type = L1CTL_TCH_MODE_CONF;
+
+	return l1ctl_client_send(l1c, msg);
+}
+
+static int l1ctl_rx_crypto_req(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_crypto_req *cr;
+	struct l1ctl_info_ul *ul;
+
+	ul = (struct l1ctl_info_ul *) msg->l1h;
+	cr = (struct l1ctl_crypto_req *) ul->payload;
+
+	struct trxcon_param_crypto_req req = {
+		.chan_nr = ul->chan_nr,
+		.a5_algo = cr->algo,
+		.key_len = cr->key_len,
+		.key = cr->key,
+	};
+
+	LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+		  "L1CTL_CRYPTO_REQ (algo=A5/%u, key_len=%u)\n",
+		  req.a5_algo, req.key_len);
+
+	osmo_fsm_inst_dispatch(fi, TRXCON_EV_CRYPTO_REQ, &req);
+
+	msgb_free(msg);
+	return 0;
+}
+
+int l1ctl_rx_cb(struct l1ctl_client *l1c, struct msgb *msg)
+{
+	struct osmo_fsm_inst *fi = l1c->priv;
+	struct l1ctl_hdr *l1h;
+
+	l1h = (struct l1ctl_hdr *) msg->l1h;
+	msg->l1h = l1h->data;
+
+	switch (l1h->msg_type) {
+	case L1CTL_FBSB_REQ:
+		return l1ctl_rx_fbsb_req(l1c, msg);
+	case L1CTL_PM_REQ:
+		return l1ctl_rx_pm_req(l1c, msg);
+	case L1CTL_RESET_REQ:
+		return l1ctl_rx_reset_req(l1c, msg);
+	case L1CTL_ECHO_REQ:
+		return l1ctl_rx_echo_req(l1c, msg);
+	case L1CTL_CCCH_MODE_REQ:
+		return l1ctl_rx_ccch_mode_req(l1c, msg);
+	case L1CTL_RACH_REQ:
+		return l1ctl_rx_rach_req(l1c, msg, false);
+	case L1CTL_EXT_RACH_REQ:
+		return l1ctl_rx_rach_req(l1c, msg, true);
+	case L1CTL_DM_EST_REQ:
+		return l1ctl_rx_dm_est_req(l1c, msg);
+	case L1CTL_DM_REL_REQ:
+		return l1ctl_rx_dm_rel_req(l1c, msg);
+	case L1CTL_DATA_REQ:
+		return l1ctl_rx_dt_req(l1c, msg, false);
+	case L1CTL_TRAFFIC_REQ:
+		return l1ctl_rx_dt_req(l1c, msg, true);
+	case L1CTL_PARAM_REQ:
+		return l1ctl_rx_param_req(l1c, msg);
+	case L1CTL_TCH_MODE_REQ:
+		return l1ctl_rx_tch_mode_req(l1c, msg);
+	case L1CTL_CRYPTO_REQ:
+		return l1ctl_rx_crypto_req(l1c, msg);
+
+	/* Not (yet) handled messages */
+	case L1CTL_NEIGH_PM_REQ:
+	case L1CTL_DATA_TBF_REQ:
+	case L1CTL_TBF_CFG_REQ:
+	case L1CTL_DM_FREQ_REQ:
+	case L1CTL_SIM_REQ:
+		LOGPFSMSL(fi, DL1C, LOGL_NOTICE,
+			  "Ignoring unsupported message (type=%u)\n",
+			  l1h->msg_type);
+		msgb_free(msg);
+		return -ENOTSUP;
+	default:
+		LOGPFSMSL(fi, DL1C, LOGL_ERROR, "Unknown MSG type %u: %s\n",
+			  l1h->msg_type, osmo_hexdump(msgb_data(msg), msgb_length(msg)));
+		msgb_free(msg);
+		return -EINVAL;
+	}
+}

trxcon/src/l1ctl_server.c

@@ -0,0 +1,282 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * UNIX socket server for L1CTL
+ *
+ * (C) 2013 by Sylvain Munaut <tnt@246tNt.com>
+ * (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
+ * (C) 2022 by by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/un.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/write_queue.h>
+
+#include <osmocom/bb/trxcon/logging.h>
+#include <osmocom/bb/trxcon/l1ctl_server.h>
+
+#define LOGP_CLI(cli, cat, level, fmt, args...) \
+	LOGP(cat, level, "%s" fmt, (cli)->log_prefix, ## args)
+
+static int l1ctl_client_read_cb(struct osmo_fd *ofd)
+{
+	struct l1ctl_client *client = (struct l1ctl_client *)ofd->data;
+	struct msgb *msg;
+	uint16_t len;
+	int rc;
+
+	/* Attempt to read from socket */
+	rc = read(ofd->fd, &len, L1CTL_MSG_LEN_FIELD);
+	if (rc != L1CTL_MSG_LEN_FIELD) {
+		if (rc <= 0) {
+			LOGP_CLI(client, DL1D, LOGL_NOTICE,
+				 "L1CTL connection error: read() failed (rc=%d): %s\n",
+				 rc, strerror(errno));
+		} else {
+			LOGP_CLI(client, DL1D, LOGL_NOTICE,
+				 "L1CTL connection error: short read\n");
+			rc = -EIO;
+		}
+		l1ctl_client_conn_close(client);
+		return rc;
+	}
+
+	/* Check message length */
+	len = ntohs(len);
+	if (len > L1CTL_LENGTH) {
+		LOGP_CLI(client, DL1D, LOGL_ERROR, "Length is too big: %u\n", len);
+		return -EINVAL;
+	}
+
+	/* Allocate a new msg */
+	msg = msgb_alloc_headroom(L1CTL_LENGTH + L1CTL_HEADROOM,
+		L1CTL_HEADROOM, "l1ctl_rx_msg");
+	if (!msg) {
+		LOGP_CLI(client, DL1D, LOGL_ERROR, "Failed to allocate msg\n");
+		return -ENOMEM;
+	}
+
+	msg->l1h = msgb_put(msg, len);
+	rc = read(ofd->fd, msg->l1h, msgb_l1len(msg));
+	if (rc != len) {
+		LOGP_CLI(client, DL1D, LOGL_ERROR,
+			 "Can not read data: len=%d < rc=%d: %s\n",
+			 len, rc, strerror(errno));
+		msgb_free(msg);
+		return rc;
+	}
+
+	/* Debug print */
+	LOGP_CLI(client, DL1D, LOGL_DEBUG, "RX: '%s'\n", osmo_hexdump(msg->data, msg->len));
+
+	/* Call L1CTL handler */
+	client->server->cfg->conn_read_cb(client, msg);
+
+	return 0;
+}
+
+static int l1ctl_client_write_cb(struct osmo_fd *ofd, struct msgb *msg)
+{
+	struct l1ctl_client *client = (struct l1ctl_client *)ofd->data;
+	int len;
+
+	if (ofd->fd <= 0)
+		return -EINVAL;
+
+	len = write(ofd->fd, msg->data, msg->len);
+	if (len != msg->len) {
+		LOGP_CLI(client, DL1D, LOGL_ERROR,
+			 "Failed to write data: written (%d) < msg_len (%d)\n",
+			 len, msg->len);
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Connection handler */
+static int l1ctl_server_conn_cb(struct osmo_fd *sfd, unsigned int flags)
+{
+	struct l1ctl_server *server = (struct l1ctl_server *)sfd->data;
+	struct l1ctl_client *client;
+	int rc, client_fd;
+
+	client_fd = accept(sfd->fd, NULL, NULL);
+	if (client_fd < 0) {
+		LOGP(DL1C, LOGL_ERROR, "Failed to accept() a new connection: "
+		     "%s\n", strerror(errno));
+		return client_fd;
+	}
+
+	if (server->cfg->num_clients_max > 0 /* 0 means unlimited */ &&
+	    server->num_clients >= server->cfg->num_clients_max) {
+		LOGP(DL1C, LOGL_NOTICE, "L1CTL server cannot accept more "
+		     "than %u connection(s)\n", server->cfg->num_clients_max);
+		close(client_fd);
+		return -ENOMEM;
+	}
+
+	client = talloc_zero(server, struct l1ctl_client);
+	if (client == NULL) {
+		LOGP(DL1C, LOGL_ERROR, "Failed to allocate an L1CTL client\n");
+		close(client_fd);
+		return -ENOMEM;
+	}
+
+	/* Init the client's write queue */
+	osmo_wqueue_init(&client->wq, 100);
+	INIT_LLIST_HEAD(&client->wq.bfd.list);
+
+	client->wq.write_cb = &l1ctl_client_write_cb;
+	client->wq.read_cb = &l1ctl_client_read_cb;
+	osmo_fd_setup(&client->wq.bfd, client_fd, OSMO_FD_READ, &osmo_wqueue_bfd_cb, client, 0);
+
+	/* Register the client's write queue */
+	rc = osmo_fd_register(&client->wq.bfd);
+	if (rc != 0) {
+		LOGP(DL1C, LOGL_ERROR, "Failed to register a new connection fd\n");
+		close(client->wq.bfd.fd);
+		talloc_free(client);
+		return rc;
+	}
+
+	llist_add_tail(&client->list, &server->clients);
+	client->id = server->next_client_id++;
+	client->server = server;
+	server->num_clients++;
+
+	LOGP(DL1C, LOGL_NOTICE, "L1CTL server got a new connection (id=%u)\n", client->id);
+
+	if (client->server->cfg->conn_accept_cb != NULL)
+		client->server->cfg->conn_accept_cb(client);
+
+	return 0;
+}
+
+int l1ctl_client_send(struct l1ctl_client *client, struct msgb *msg)
+{
+	uint8_t *len;
+
+	/* Debug print */
+	LOGP_CLI(client, DL1D, LOGL_DEBUG, "TX: '%s'\n", osmo_hexdump(msg->data, msg->len));
+
+	if (msg->l1h != msg->data)
+		LOGP_CLI(client, DL1D, LOGL_INFO, "Message L1 header != Message Data\n");
+
+	/* Prepend 16-bit length before sending */
+	len = msgb_push(msg, L1CTL_MSG_LEN_FIELD);
+	osmo_store16be(msg->len - L1CTL_MSG_LEN_FIELD, len);
+
+	if (osmo_wqueue_enqueue(&client->wq, msg) != 0) {
+		LOGP_CLI(client, DL1D, LOGL_ERROR, "Failed to enqueue msg!\n");
+		msgb_free(msg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+void l1ctl_client_conn_close(struct l1ctl_client *client)
+{
+	struct l1ctl_server *server = client->server;
+
+	LOGP_CLI(client, DL1C, LOGL_NOTICE, "Closing L1CTL connection\n");
+
+	if (server->cfg->conn_close_cb != NULL)
+		server->cfg->conn_close_cb(client);
+
+	/* Close connection socket */
+	osmo_fd_unregister(&client->wq.bfd);
+	close(client->wq.bfd.fd);
+	client->wq.bfd.fd = -1;
+
+	/* Clear pending messages */
+	osmo_wqueue_clear(&client->wq);
+
+	client->server->num_clients--;
+	llist_del(&client->list);
+	talloc_free(client);
+
+	/* If this was the last client, reset the client IDs generator to 0.
+	 * This way avoid assigning huge unreadable client IDs like 26545. */
+	if (llist_empty(&server->clients))
+		server->next_client_id = 0;
+}
+
+struct l1ctl_server *l1ctl_server_alloc(void *ctx, const struct l1ctl_server_cfg *cfg)
+{
+	struct l1ctl_server *server;
+	int rc;
+
+	LOGP(DL1C, LOGL_NOTICE, "Init L1CTL server (sock_path=%s)\n", cfg->sock_path);
+
+	server = talloc(ctx, struct l1ctl_server);
+	OSMO_ASSERT(server != NULL);
+
+	*server = (struct l1ctl_server) {
+		.clients = LLIST_HEAD_INIT(server->clients),
+		.cfg = cfg,
+	};
+
+	/* conn_read_cb shall not be NULL */
+	OSMO_ASSERT(cfg->conn_read_cb != NULL);
+
+	/* Bind connection handler */
+	osmo_fd_setup(&server->ofd, -1, OSMO_FD_READ, &l1ctl_server_conn_cb, server, 0);
+
+	rc = osmo_sock_unix_init_ofd(&server->ofd, SOCK_STREAM, 0,
+				     cfg->sock_path, OSMO_SOCK_F_BIND);
+	if (rc < 0) {
+		LOGP(DL1C, LOGL_ERROR, "Could not create UNIX socket: %s\n",
+			strerror(errno));
+		talloc_free(server);
+		return NULL;
+	}
+
+	return server;
+}
+
+void l1ctl_server_free(struct l1ctl_server *server)
+{
+	LOGP(DL1C, LOGL_NOTICE, "Shutdown L1CTL server\n");
+
+	/* Close all client connections */
+	while (!llist_empty(&server->clients)) {
+		struct l1ctl_client *client = llist_entry(server->clients.next,
+							  struct l1ctl_client,
+							  list);
+		l1ctl_client_conn_close(client);
+	}
+
+	/* Unbind listening socket */
+	if (server->ofd.fd != -1) {
+		osmo_fd_unregister(&server->ofd);
+		close(server->ofd.fd);
+		server->ofd.fd = -1;
+	}
+
+	talloc_free(server);
+}

trxcon/src/logging.c

@@ -0,0 +1,84 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ *
+ * (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+
+#include <osmocom/bb/trxcon/logging.h>
+
+static struct log_info_cat trx_log_info_cat[] = {
+	[DAPP] = {
+		.name = "DAPP",
+		.description = "Application",
+		.color = "\033[1;35m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DL1C] = {
+		.name = "DL1C",
+		.description = "Layer 1 control interface",
+		.color = "\033[1;31m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DL1D] = {
+		.name = "DL1D",
+		.description = "Layer 1 data",
+		.color = "\033[1;31m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DTRXC] = {
+		.name = "DTRXC",
+		.description = "Transceiver control interface",
+		.color = "\033[1;33m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DTRXD] = {
+		.name = "DTRXD",
+		.description = "Transceiver data interface",
+		.color = "\033[1;33m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DSCH] = {
+		.name = "DSCH",
+		.description = "Scheduler management",
+		.color = "\033[1;36m",
+		.enabled = 0, .loglevel = LOGL_NOTICE,
+	},
+	[DSCHD] = {
+		.name = "DSCHD",
+		.description = "Scheduler data",
+		.color = "\033[1;36m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+};
+
+static const struct log_info trx_log_info = {
+	.cat = trx_log_info_cat,
+	.num_cat = ARRAY_SIZE(trx_log_info_cat),
+};
+
+int trx_log_init(void *tall_ctx, const char *category_mask)
+{
+	osmo_init_logging2(tall_ctx, &trx_log_info);
+
+	if (category_mask)
+		log_parse_category_mask(osmo_stderr_target, category_mask);
+
+	return 0;
+}

trxcon/src/sched_clck.c

@@ -0,0 +1,203 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: clock synchronization
+ *
+ * (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
+ * (C) 2015 by Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
+ * (C) 2015 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/timer_compat.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+#define MAX_FN_SKEW		50
+#define TRX_LOSS_FRAMES	400
+
+static void l1sched_clck_tick(void *data)
+{
+	struct l1sched_state *sched = (struct l1sched_state *) data;
+	struct timespec tv_now, *tv_clock, elapsed;
+	int64_t elapsed_us;
+	const struct timespec frame_duration = { .tv_sec = 0, .tv_nsec = GSM_TDMA_FN_DURATION_nS };
+
+	/* Check if transceiver is still alive */
+	if (sched->fn_counter_lost++ == TRX_LOSS_FRAMES) {
+		LOGP_SCHEDC(sched, LOGL_DEBUG, "No more clock from transceiver\n");
+		sched->clck_state = L1SCHED_CLCK_ST_WAIT;
+
+		return;
+	}
+
+	/* Get actual / previous frame time */
+	osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now);
+	tv_clock = &sched->clock;
+
+	timespecsub(&tv_now, tv_clock, &elapsed);
+	elapsed_us = (elapsed.tv_sec * 1000000) + (elapsed.tv_nsec / 1000);
+
+	/* If someone played with clock, or if the process stalled */
+	if (elapsed_us > GSM_TDMA_FN_DURATION_uS * MAX_FN_SKEW || elapsed_us < 0) {
+		LOGP_SCHEDC(sched, LOGL_NOTICE, "PC clock skew: "
+			    "elapsed uS %" PRId64 "\n", elapsed_us);
+
+		sched->clck_state = L1SCHED_CLCK_ST_WAIT;
+
+		return;
+	}
+
+	/* Schedule next FN clock */
+	while (elapsed_us > GSM_TDMA_FN_DURATION_uS / 2) {
+		timespecadd(tv_clock, &frame_duration, tv_clock);
+		elapsed_us -= GSM_TDMA_FN_DURATION_uS;
+
+		GSM_TDMA_FN_INC(sched->fn_counter_proc);
+
+		/* Call frame callback */
+		if (sched->clock_cb)
+			sched->clock_cb(sched);
+	}
+
+	osmo_timer_schedule(&sched->clock_timer, 0,
+		GSM_TDMA_FN_DURATION_uS - elapsed_us);
+}
+
+static void l1sched_clck_correct(struct l1sched_state *sched,
+	struct timespec *tv_now, uint32_t fn)
+{
+	sched->fn_counter_proc = fn;
+
+	/* Call frame callback */
+	if (sched->clock_cb)
+		sched->clock_cb(sched);
+
+	/* Schedule first FN clock */
+	sched->clock = *tv_now;
+	memset(&sched->clock_timer, 0, sizeof(sched->clock_timer));
+
+	sched->clock_timer.cb = l1sched_clck_tick;
+	sched->clock_timer.data = sched;
+	osmo_timer_schedule(&sched->clock_timer, 0, GSM_TDMA_FN_DURATION_uS);
+}
+
+int l1sched_clck_handle(struct l1sched_state *sched, uint32_t fn)
+{
+	struct timespec tv_now, *tv_clock, elapsed;
+	int64_t elapsed_us, elapsed_fn;
+
+	/* Reset lost counter */
+	sched->fn_counter_lost = 0;
+
+	/* Get actual / previous frame time */
+	osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now);
+	tv_clock = &sched->clock;
+
+	/* If this is the first CLCK IND */
+	if (sched->clck_state == L1SCHED_CLCK_ST_WAIT) {
+		l1sched_clck_correct(sched, &tv_now, fn);
+
+		LOGP_SCHEDC(sched, LOGL_DEBUG, "Initial clock received: fn=%u\n", fn);
+		sched->clck_state = L1SCHED_CLCK_ST_OK;
+
+		return 0;
+	}
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE, "Clock indication: fn=%u\n", fn);
+
+	osmo_timer_del(&sched->clock_timer);
+
+	/* Calculate elapsed time / frames since last processed fn */
+	timespecsub(&tv_now, tv_clock, &elapsed);
+	elapsed_us = (elapsed.tv_sec * 1000000) + (elapsed.tv_nsec / 1000);
+	elapsed_fn = GSM_TDMA_FN_SUB(fn, sched->fn_counter_proc);
+
+	if (elapsed_fn >= 135774)
+		elapsed_fn -= GSM_TDMA_HYPERFRAME;
+
+	/* Check for max clock skew */
+	if (elapsed_fn > MAX_FN_SKEW || elapsed_fn < -MAX_FN_SKEW) {
+		LOGP_SCHEDC(sched, LOGL_NOTICE, "GSM clock skew: old fn=%u, "
+			    "new fn=%u\n", sched->fn_counter_proc, fn);
+
+		l1sched_clck_correct(sched, &tv_now, fn);
+		return 0;
+	}
+
+	LOGP_SCHEDC(sched, LOGL_INFO, "GSM clock jitter: %" PRId64 "\n",
+		    elapsed_fn * GSM_TDMA_FN_DURATION_uS - elapsed_us);
+
+	/* Too many frames have been processed already */
+	if (elapsed_fn < 0) {
+		struct timespec duration;
+		/**
+		 * Set clock to the time or last FN should
+		 * have been transmitted
+		 */
+		duration.tv_nsec = (0 - elapsed_fn) * GSM_TDMA_FN_DURATION_nS;
+		duration.tv_sec = duration.tv_nsec / 1000000000;
+		duration.tv_nsec = duration.tv_nsec % 1000000000;
+		timespecadd(&tv_now, &duration, tv_clock);
+
+		/* Set time to the time our next FN has to be transmitted */
+		osmo_timer_schedule(&sched->clock_timer, 0,
+			GSM_TDMA_FN_DURATION_uS * (1 - elapsed_fn));
+
+		return 0;
+	}
+
+	/* Transmit what we still need to transmit */
+	while (fn != sched->fn_counter_proc) {
+		GSM_TDMA_FN_INC(sched->fn_counter_proc);
+
+		/* Call frame callback */
+		if (sched->clock_cb)
+			sched->clock_cb(sched);
+	}
+
+	/* Schedule next FN to be transmitted */
+	*tv_clock = tv_now;
+	osmo_timer_schedule(&sched->clock_timer, 0, GSM_TDMA_FN_DURATION_uS);
+
+	return 0;
+}
+
+void l1sched_clck_reset(struct l1sched_state *sched)
+{
+	/* Reset internal state */
+	sched->clck_state = L1SCHED_CLCK_ST_WAIT;
+
+	/* Stop clock timer */
+	osmo_timer_del(&sched->clock_timer);
+
+	/* Flush counters */
+	sched->fn_counter_proc = 0;
+	sched->fn_counter_lost = 0;
+}

trxcon/src/sched_lchan_common.c

@@ -0,0 +1,143 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: common routines for lchan handlers
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <talloc.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <arpa/inet.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/codec/codec.h>
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/protocol/gsm_08_58.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+/* GSM 05.02 Chapter 5.2.3 Normal Burst (NB) */
+const uint8_t l1sched_nb_training_bits[8][26] = {
+	{
+		0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0,
+		0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1,
+	},
+	{
+		0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1,
+		1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1,
+	},
+	{
+		0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1,
+		0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0,
+	},
+	{
+		0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0,
+		1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
+	},
+	{
+		0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0,
+		1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1,
+	},
+	{
+		0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0,
+		0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0,
+	},
+	{
+		1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1,
+		0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
+	},
+	{
+		1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0,
+		0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0,
+	},
+};
+
+/* Get a string representation of the burst buffer's completeness.
+ * Examples: "  ****.." (incomplete, 4/6 bursts)
+ *           "    ****" (complete, all 4 bursts)
+ *           "**.***.." (incomplete, 5/8 bursts) */
+const char *l1sched_burst_mask2str(const uint8_t *mask, int bits)
+{
+	/* TODO: CSD is interleaved over 22 bursts, so the mask needs to be extended */
+	static char buf[8 + 1];
+	char *ptr = buf;
+
+	OSMO_ASSERT(bits <= 8 && bits > 0);
+
+	while (--bits >= 0)
+		*(ptr++) = (*mask & (1 << bits)) ? '*' : '.';
+	*ptr = '\0';
+
+	return buf;
+}
+
+/**
+ * Composes a bad frame indication message
+ * according to the current tch_mode.
+ *
+ * @param  l2       Caller-allocated byte array
+ * @param  lchan    Logical channel to generate BFI for
+ * @return          How much bytes were written
+ */
+size_t l1sched_bad_frame_ind(uint8_t *l2, struct l1sched_lchan_state *lchan)
+{
+	int rc;
+
+	switch (lchan->tch_mode) {
+	case GSM48_CMODE_SPEECH_V1:
+		if (lchan->type == L1SCHED_TCHF) { /* Full Rate */
+			memset(l2, 0x00, GSM_FR_BYTES);
+			l2[0] = 0xd0;
+			return GSM_FR_BYTES;
+		} else { /* Half Rate */
+			memset(l2 + 1, 0x00, GSM_HR_BYTES);
+			l2[0] = 0x70; /* F = 0, FT = 111 */
+			return GSM_HR_BYTES + 1;
+		}
+	case GSM48_CMODE_SPEECH_EFR: /* Enhanced Full Rate */
+		memset(l2, 0x00, GSM_EFR_BYTES);
+		l2[0] = 0xc0;
+		return GSM_EFR_BYTES;
+	case GSM48_CMODE_SPEECH_AMR: /* Adaptive Multi Rate */
+		rc = osmo_amr_rtp_enc(l2,
+			lchan->amr.codec[lchan->amr.dl_cmr],
+			lchan->amr.codec[lchan->amr.dl_ft],
+			AMR_BAD);
+		if (rc < 2) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Failed to encode AMR_BAD frame (rc=%d), "
+				    "not sending BFI\n", rc);
+			return 0;
+		}
+		memset(l2 + 2, 0, rc - 2);
+		return rc;
+	case GSM48_CMODE_SIGN:
+		LOGP_LCHAND(lchan, LOGL_ERROR, "BFI is not allowed in signalling mode\n");
+		return 0;
+	default:
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Invalid TCH mode: %u\n", lchan->tch_mode);
+		return 0;
+	}
+}

trxcon/src/sched_lchan_desc.c

@@ -0,0 +1,623 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: logical channels, RX / TX handlers
+ *
+ * (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
+ * (C) 2015 by Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
+ * (C) 2015 by Harald Welte <laforge@gnumonks.org>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <osmocom/gsm/protocol/gsm_08_58.h>
+#include <osmocom/core/gsmtap.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+
+/* Forward declaration of handlers */
+int rx_data_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas);
+
+int tx_data_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br);
+
+int rx_sch_fn(struct l1sched_lchan_state *lchan,
+	      uint32_t fn, uint8_t bid, const sbit_t *bits,
+	      const struct l1sched_meas_set *meas);
+
+int tx_rach_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br);
+
+int rx_tchf_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas);
+
+int tx_tchf_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br);
+
+int rx_tchh_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas);
+
+int tx_tchh_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br);
+
+int rx_pdtch_fn(struct l1sched_lchan_state *lchan,
+		uint32_t fn, uint8_t bid, const sbit_t *bits,
+		const struct l1sched_meas_set *meas);
+
+int tx_pdtch_fn(struct l1sched_lchan_state *lchan,
+		struct l1sched_burst_req *br);
+
+const struct l1sched_lchan_desc l1sched_lchan_desc[_L1SCHED_CHAN_MAX] = {
+	[L1SCHED_IDLE] = {
+		.name = "IDLE",
+		.desc = "Idle channel",
+		/* The MS needs to perform neighbour measurements during
+		 * IDLE slots, however this is not implemented (yet). */
+	},
+	[L1SCHED_FCCH] = {
+		.name = "FCCH", /* 3GPP TS 05.02, section 3.3.2.1 */
+		.desc = "Frequency correction channel",
+		/* Handled by transceiver, nothing to do. */
+	},
+	[L1SCHED_SCH] = {
+		.name = "SCH", /* 3GPP TS 05.02, section 3.3.2.2 */
+		.desc = "Synchronization channel",
+
+		/* 3GPP TS 05.03, section 4.7. Handled by transceiver,
+		 * however we still need to parse BSIC (BCC / NCC). */
+		.flags = L1SCHED_CH_FLAG_AUTO,
+		.rx_fn = rx_sch_fn,
+	},
+	[L1SCHED_BCCH] = {
+		.name = "BCCH", /* 3GPP TS 05.02, section 3.3.2.3 */
+		.desc = "Broadcast control channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_BCCH,
+		.chan_nr = RSL_CHAN_BCCH,
+
+		/* Rx only, xCCH convolutional coding (3GPP TS 05.03, section 4.4),
+		 * regular interleaving (3GPP TS 05.02, clause 7, table 3):
+		 * a L2 frame is interleaved over 4 consecutive bursts. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_AUTO,
+		.rx_fn = rx_data_fn,
+	},
+	[L1SCHED_RACH] = {
+		.name = "RACH", /* 3GPP TS 05.02, section 3.3.3.1 */
+		.desc = "Random access channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_RACH,
+		.chan_nr = RSL_CHAN_RACH,
+
+		/* Tx only, RACH convolutional coding (3GPP TS 05.03, section 4.6). */
+		.flags = L1SCHED_CH_FLAG_AUTO,
+		.tx_fn = tx_rach_fn,
+	},
+	[L1SCHED_CCCH] = {
+		.name = "CCCH", /* 3GPP TS 05.02, section 3.3.3.1 */
+		.desc = "Common control channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_CCCH,
+		.chan_nr = RSL_CHAN_PCH_AGCH,
+
+		/* Rx only, xCCH convolutional coding (3GPP TS 05.03, section 4.4),
+		 * regular interleaving (3GPP TS 05.02, clause 7, table 3):
+		 * a L2 frame is interleaved over 4 consecutive bursts. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_AUTO,
+		.rx_fn = rx_data_fn,
+	},
+	[L1SCHED_TCHF] = {
+		.name = "TCH/F", /* 3GPP TS 05.02, section 3.2 */
+		.desc = "Full Rate traffic channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_F,
+		.chan_nr = RSL_CHAN_Bm_ACCHs,
+		.link_id = L1SCHED_CH_LID_DEDIC,
+
+		/* Rx and Tx, multiple convolutional coding types (3GPP TS 05.03,
+		 * chapter 3), block diagonal interleaving (3GPP TS 05.02, clause 7):
+		 *
+		 *   - a traffic frame is interleaved over 8 consecutive bursts
+		 *     using the even numbered bits of the first 4 bursts
+		 *     and odd numbered bits of the last 4 bursts;
+		 *   - a FACCH/F frame 'steals' (replaces) one traffic frame,
+		 *     interleaving is done in the same way.
+		 *
+		 * The MS shall continuously transmit bursts, even if there is nothing
+		 * to send, unless DTX (Discontinuous Transmission) is used. */
+		.burst_buf_size = 8 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_tchf_fn,
+		.tx_fn = tx_tchf_fn,
+	},
+	[L1SCHED_TCHH_0] = {
+		.name = "TCH/H(0)", /* 3GPP TS 05.02, section 3.2 */
+		.desc = "Half Rate traffic channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_H,
+		.chan_nr = RSL_CHAN_Lm_ACCHs + (0 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 0,
+
+		/* Rx and Tx, multiple convolutional coding types (3GPP TS 05.03,
+		 * chapter 3), block diagonal interleaving (3GPP TS 05.02, clause 7):
+		 *
+		 *   - a traffic frame is interleaved over 4 non-consecutive bursts
+		 *     using the even numbered bits of the first 2 bursts,
+		 *     and odd numbered bits of the last 2 bursts;
+		 *   - a FACCH/H frame is interleaved over 6 non-consecutive bursts
+		 *     using the even numbered bits of the first 2 bursts,
+		 *     all bits of the middle two 2 bursts,
+		 *     and odd numbered bits of the last 2 bursts;
+		 *   - a FACCH/H frame 'steals' (replaces) two traffic frames,
+		 *     interleaving is done over 4 consecutive bursts,
+		 *     the same as given for a TCH/FS.
+		 *
+		 * The MS shall continuously transmit bursts, even if there is nothing
+		 * to send, unless DTX (Discontinuous Transmission) is used. */
+		.burst_buf_size = 6 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_tchh_fn,
+		.tx_fn = tx_tchh_fn,
+	},
+	[L1SCHED_TCHH_1] = {
+		.name = "TCH/H(1)", /* 3GPP TS 05.02, section 3.2 */
+		.desc = "Half Rate traffic channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_H,
+		.chan_nr = RSL_CHAN_Lm_ACCHs + (1 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_TCHH_0, see above. */
+		.burst_buf_size = 6 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_tchh_fn,
+		.tx_fn = tx_tchh_fn,
+	},
+	[L1SCHED_SDCCH4_0] = {
+		.name = "SDCCH/4(0)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (0 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 0,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH4_1] = {
+		.name = "SDCCH/4(1)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (1 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH4_2] = {
+		.name = "SDCCH/4(2)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 2)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (2 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH4_3] = {
+		.name = "SDCCH/4(3)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 3)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (3 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 3,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_0] = {
+		.name = "SDCCH/8(0)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (0 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 0,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_1] = {
+		.name = "SDCCH/8(1)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (1 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_2] = {
+		.name = "SDCCH/8(2)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 2)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (2 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_3] = {
+		.name = "SDCCH/8(3)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 3)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (3 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 3,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_4] = {
+		.name = "SDCCH/8(4)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 4)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (4 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 4,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_5] = {
+		.name = "SDCCH/8(5)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 5)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (5 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 5,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_6] = {
+		.name = "SDCCH/8(6)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 6)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (6 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 6,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SDCCH8_7] = {
+		.name = "SDCCH/8(7)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Stand-alone dedicated control channel (sub-channel 7)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (7 << 3),
+		.link_id = L1SCHED_CH_LID_DEDIC,
+		.ss_nr = 7,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCHTF] = {
+		.name = "SACCH/TF", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow TCH/F associated control channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_F | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_Bm_ACCHs,
+		.link_id = L1SCHED_CH_LID_SACCH,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCHTH_0] = {
+		.name = "SACCH/TH(0)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow TCH/H associated control channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_H | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_Lm_ACCHs + (0 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 0,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCHTH_1] = {
+		.name = "SACCH/TH(1)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow TCH/H associated control channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_TCH_H | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_Lm_ACCHs + (1 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_BCCH (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH4_0] = {
+		.name = "SACCH/4(0)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/4 associated control channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (0 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 0,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH4_1] = {
+		.name = "SACCH/4(1)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/4 associated control channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (1 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH4_2] = {
+		.name = "SACCH/4(2)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/4 associated control channel (sub-channel 2)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (2 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH4_3] = {
+		.name = "SACCH/4(3)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/4 associated control channel (sub-channel 3)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH4 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH4_ACCH + (3 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 3,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH4_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_0] = {
+		.name = "SACCH/8(0)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 0)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (0 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 0,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_1] = {
+		.name = "SACCH/8(1)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 1)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (1 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 1,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_2] = {
+		.name = "SACCH/8(2)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 2)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (2 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_3] = {
+		.name = "SACCH/8(3)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 3)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (3 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 3,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_4] = {
+		.name = "SACCH/8(4)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 4)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (4 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 4,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_5] = {
+		.name = "SACCH/8(5)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 5)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (5 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 5,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_6] = {
+		.name = "SACCH/8(6)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 6)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (6 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 6,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_SACCH8_7] = {
+		.name = "SACCH/8(7)", /* 3GPP TS 05.02, section 3.3.4.1 */
+		.desc = "Slow SDCCH/8 associated control channel (sub-channel 7)",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_SDCCH8 | GSMTAP_CHANNEL_ACCH,
+		.chan_nr = RSL_CHAN_SDCCH8_ACCH + (7 << 3),
+		.link_id = L1SCHED_CH_LID_SACCH,
+		.ss_nr = 7,
+
+		/* Same as for L1SCHED_BCCH and L1SCHED_SDCCH8_* (xCCH), see above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_CBTX,
+		.rx_fn = rx_data_fn,
+		.tx_fn = tx_data_fn,
+	},
+	[L1SCHED_PDTCH] = {
+		.name = "PDTCH", /* 3GPP TS 05.02, sections 3.2.4, 3.3.2.4 */
+		.desc = "Packet data traffic & control channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_PDTCH,
+		.chan_nr = RSL_CHAN_OSMO_PDCH,
+
+		/* Rx and Tx, multiple coding schemes: CS-1..4 and MCS-1..9 (3GPP TS
+		 * 05.03, chapter 5), regular interleaving as specified for xCCH.
+		 * NOTE: the burst buffer is three times bigger because the
+		 * payload of EDGE bursts is three times longer. */
+		.burst_buf_size = 3 * 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_PDCH,
+		.rx_fn = rx_pdtch_fn,
+		.tx_fn = tx_pdtch_fn,
+	},
+	[L1SCHED_PTCCH] = {
+		.name = "PTCCH", /* 3GPP TS 05.02, section 3.3.4.2 */
+		.desc = "Packet Timing advance control channel",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_PTCCH,
+		.chan_nr = RSL_CHAN_OSMO_PDCH,
+		.link_id = L1SCHED_CH_LID_PTCCH,
+
+		/* On the Uplink, mobile stations transmit random Access Bursts
+		 * to allow estimation of the timing advance for one MS in packet
+		 * transfer mode. On Downlink, the network sends timing advance
+		 * updates for several mobile stations. The coding scheme used
+		 * for PTCCH/D messages is the same as for PDTCH CS-1. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_PDCH,
+		.rx_fn = rx_pdtch_fn,
+		.tx_fn = tx_rach_fn,
+	},
+	[L1SCHED_SDCCH4_CBCH] = {
+		.name = "SDCCH/4(CBCH)", /* 3GPP TS 05.02, section 3.3.5 */
+		.desc = "Cell Broadcast channel on SDCCH/4",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_CBCH51,
+		.chan_nr = RSL_CHAN_OSMO_CBCH4,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH (xCCH), but Rx only. See above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.flags = L1SCHED_CH_FLAG_AUTO,
+		.rx_fn = rx_data_fn,
+	},
+	[L1SCHED_SDCCH8_CBCH] = {
+		.name = "SDCCH/8(CBCH)", /* 3GPP TS 05.02, section 3.3.5 */
+		.desc = "Cell Broadcast channel on SDCCH/8",
+		.gsmtap_chan_type = GSMTAP_CHANNEL_CBCH52,
+		.chan_nr = RSL_CHAN_OSMO_CBCH8,
+		.ss_nr = 2,
+
+		/* Same as for L1SCHED_BCCH (xCCH), but Rx only. See above. */
+		.burst_buf_size = 4 * GSM_BURST_PL_LEN,
+		.rx_fn = rx_data_fn,
+	},
+};

trxcon/src/sched_lchan_pdtch.c

@@ -0,0 +1,172 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2018-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/coding/gsm0503_coding.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+int rx_pdtch_fn(struct l1sched_lchan_state *lchan,
+		uint32_t fn, uint8_t bid, const sbit_t *bits,
+		const struct l1sched_meas_set *meas)
+{
+	uint8_t l2[GPRS_L2_MAX_LEN], *mask;
+	int n_errors, n_bits_total, rc;
+	sbit_t *buffer, *offset;
+	size_t l2_len;
+
+	/* Set up pointers */
+	mask = &lchan->rx_burst_mask;
+	buffer = lchan->rx_bursts;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Packet data received: fn=%u bid=%u\n", fn, bid);
+
+	/* Align to the first burst of a block */
+	if (*mask == 0x00 && bid != 0)
+		return 0;
+
+	/* Update mask */
+	*mask |= (1 << bid);
+
+	/* Store the measurements */
+	l1sched_lchan_meas_push(lchan, meas);
+
+	/* Copy burst to buffer of 4 bursts */
+	offset = buffer + bid * 116;
+	memcpy(offset, bits + 3, 58);
+	memcpy(offset + 58, bits + 87, 58);
+
+	/* Wait until complete set of bursts */
+	if (bid != 3)
+		return 0;
+
+	/* Calculate AVG of the measurements */
+	l1sched_lchan_meas_avg(lchan, 4);
+
+	/* Check for complete set of bursts */
+	if ((*mask & 0xf) != 0xf) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received incomplete (%s) packet data at fn=%u (%u/%u)\n",
+			    l1sched_burst_mask2str(mask, 4), lchan->meas_avg.fn,
+			    lchan->meas_avg.fn % lchan->ts->mf_layout->period,
+			    lchan->ts->mf_layout->period);
+		/* NOTE: do not abort here, give it a try. Maybe we're lucky ;) */
+	}
+
+	/* Keep the mask updated */
+	*mask = *mask << 4;
+
+	/* Attempt to decode */
+	rc = gsm0503_pdtch_decode(l2, buffer,
+		NULL, &n_errors, &n_bits_total);
+	if (rc < 0) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received bad frame (rc=%d, ber=%d/%d) at fn=%u\n",
+			    rc, n_errors, n_bits_total, lchan->meas_avg.fn);
+	}
+
+	/* Determine L2 length */
+	l2_len = rc > 0 ? rc : 0;
+
+	/* Send a L2 frame to the higher layers */
+	l1sched_handle_data_ind(lchan, l2, l2_len, n_errors, n_bits_total, L1SCHED_DT_PACKET_DATA);
+
+	return 0;
+}
+
+
+int tx_pdtch_fn(struct l1sched_lchan_state *lchan,
+		struct l1sched_burst_req *br)
+{
+	ubit_t *buffer, *offset;
+	const uint8_t *tsc;
+	uint8_t *mask;
+	int rc;
+
+	/* Set up pointers */
+	mask = &lchan->tx_burst_mask;
+	buffer = lchan->tx_bursts;
+
+	if (br->bid > 0) {
+		/* If we have encoded bursts */
+		if (*mask)
+			goto send_burst;
+		else
+			return 0;
+	}
+
+	/* Encode payload */
+	rc = gsm0503_pdtch_encode(buffer, lchan->prim->payload,
+		lchan->prim->payload_len);
+	if (rc < 0) {
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n",
+			    lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload,
+								   lchan->prim->payload_len));
+
+		/* Forget this primitive */
+		l1sched_prim_drop(lchan);
+
+		return -EINVAL;
+	}
+
+send_burst:
+	/* Determine which burst should be sent */
+	offset = buffer + br->bid * 116;
+
+	/* Update mask */
+	*mask |= (1 << br->bid);
+
+	/* Choose proper TSC */
+	tsc = l1sched_nb_training_bits[lchan->tsc];
+
+	/* Compose a new burst */
+	memset(br->burst, 0, 3); /* TB */
+	memcpy(br->burst + 3, offset, 58); /* Payload 1/2 */
+	memcpy(br->burst + 61, tsc, 26); /* TSC */
+	memcpy(br->burst + 87, offset + 58, 58); /* Payload 2/2 */
+	memset(br->burst + 145, 0, 3); /* TB */
+	br->burst_len = GSM_BURST_LEN;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Scheduled at fn=%u burst=%u\n", br->fn, br->bid);
+
+	/* If we have sent the last (4/4) burst */
+	if ((*mask & 0x0f) == 0x0f) {
+		/* Confirm data / traffic sending */
+		l1sched_handle_data_cnf(lchan, br->fn, L1SCHED_DT_PACKET_DATA);
+
+		/* Forget processed primitive */
+		l1sched_prim_drop(lchan);
+
+		/* Reset mask */
+		*mask = 0x00;
+	}
+
+	return 0;
+}

trxcon/src/sched_lchan_rach.c

@@ -0,0 +1,160 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/coding/gsm0503_coding.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+/* 3GPP TS 05.02, section 5.2.7 "Access burst (AB)" */
+#define RACH_EXT_TAIL_BITS_LEN	8
+#define RACH_SYNCH_SEQ_LEN	41
+#define RACH_PAYLOAD_LEN	36
+
+/* Extended tail bits (BN0..BN7) */
+static const ubit_t rach_ext_tail_bits[] = {
+	0, 0, 1, 1, 1, 0, 1, 0,
+};
+
+/* Synchronization (training) sequence types */
+enum rach_synch_seq_t {
+	RACH_SYNCH_SEQ_UNKNOWN = -1,
+	RACH_SYNCH_SEQ_TS0, /* GSM, GMSK (default) */
+	RACH_SYNCH_SEQ_TS1, /* EGPRS, 8-PSK */
+	RACH_SYNCH_SEQ_TS2, /* EGPRS, GMSK */
+	RACH_SYNCH_SEQ_NUM
+};
+
+/* Synchronization (training) sequence bits */
+static const char rach_synch_seq_bits[RACH_SYNCH_SEQ_NUM][RACH_SYNCH_SEQ_LEN] = {
+	[RACH_SYNCH_SEQ_TS0] = "01001011011111111001100110101010001111000",
+	[RACH_SYNCH_SEQ_TS1] = "01010100111110001000011000101111001001101",
+	[RACH_SYNCH_SEQ_TS2] = "11101111001001110101011000001101101110111",
+};
+
+/* Synchronization (training) sequence names */
+static struct value_string rach_synch_seq_names[] = {
+	{ RACH_SYNCH_SEQ_UNKNOWN, "UNKNOWN" },
+	{ RACH_SYNCH_SEQ_TS0, "TS0: GSM, GMSK" },
+	{ RACH_SYNCH_SEQ_TS1, "TS1: EGPRS, 8-PSK" },
+	{ RACH_SYNCH_SEQ_TS2, "TS2: EGPRS, GMSK" },
+	{ 0, NULL },
+};
+
+/* Obtain a to-be-transmitted RACH burst */
+int tx_rach_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br)
+{
+	const uint8_t bsic = lchan->ts->sched->bsic;
+	struct l1sched_ts_prim_rach *rach;
+	uint8_t *burst_ptr = br->burst;
+	uint8_t payload[36];
+	int i, rc;
+
+	rach = (struct l1sched_ts_prim_rach *)lchan->prim->payload;
+
+	/* Delay sending according to offset value */
+	if (rach->offset-- > 0)
+		return 0;
+
+	if (L1SCHED_PRIM_IS_RACH11(lchan->prim)) {
+		/* Check requested synch. sequence */
+		if (rach->synch_seq >= RACH_SYNCH_SEQ_NUM) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Unknown RACH synch. sequence=0x%02x\n",
+				    rach->synch_seq);
+
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return -ENOTSUP;
+		}
+
+		/* Encode 11-bit payload */
+		rc = gsm0503_rach_ext_encode(payload, rach->ra, bsic, true);
+		if (rc) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Could not encode 11-bit RACH burst (ra=%u bsic=%u)\n",
+				    rach->ra, bsic);
+
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return rc;
+		}
+	} else if (L1SCHED_PRIM_IS_RACH8(lchan->prim)) {
+		rach->synch_seq = RACH_SYNCH_SEQ_TS0;
+
+		/* Encode 8-bit payload */
+		rc = gsm0503_rach_ext_encode(payload, rach->ra, bsic, false);
+		if (rc) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Could not encode RACH burst (ra=%u bsic=%u)\n",
+				    rach->ra, bsic);
+
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return rc;
+		}
+	} else {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Primitive has unexpected type=0x%02x\n",
+			    lchan->prim->type);
+		l1sched_prim_drop(lchan);
+		return -EINVAL;
+	}
+
+
+	/* BN0-7: extended tail bits */
+	memcpy(burst_ptr, rach_ext_tail_bits, RACH_EXT_TAIL_BITS_LEN);
+	burst_ptr += RACH_EXT_TAIL_BITS_LEN;
+
+	/* BN8-48: chosen synch. (training) sequence */
+	for (i = 0; i < RACH_SYNCH_SEQ_LEN; i++)
+		*(burst_ptr++) = rach_synch_seq_bits[rach->synch_seq][i] == '1';
+
+	/* BN49-84: encrypted bits (the payload) */
+	memcpy(burst_ptr, payload, RACH_PAYLOAD_LEN);
+	burst_ptr += RACH_PAYLOAD_LEN;
+
+	/* BN85-156: tail bits & extended guard period */
+	memset(burst_ptr, 0, br->burst + GSM_BURST_LEN - burst_ptr);
+	br->burst_len = GSM_BURST_LEN;
+
+	LOGP_LCHAND(lchan, LOGL_NOTICE, "Scheduled %s-bit RACH (%s) at fn=%u\n",
+		    L1SCHED_PRIM_IS_RACH11(lchan->prim) ? "11" : "8",
+		    get_value_string(rach_synch_seq_names, rach->synch_seq), br->fn);
+
+	/* Confirm RACH request */
+	l1sched_handle_data_cnf(lchan, br->fn, L1SCHED_DT_OTHER);
+
+	/* Forget processed primitive */
+	l1sched_prim_drop(lchan);
+
+	return 0;
+}

trxcon/src/sched_lchan_sch.c

@@ -0,0 +1,106 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <talloc.h>
+#include <stdint.h>
+
+#include <arpa/inet.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/coding/gsm0503_coding.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+static void decode_sb(struct gsm_time *time, uint8_t *bsic, uint8_t *sb_info)
+{
+	uint8_t t3p;
+	uint32_t sb;
+
+	sb = ((uint32_t)sb_info[3] << 24)
+	   | (sb_info[2] << 16)
+	   | (sb_info[1] << 8)
+	   | sb_info[0];
+
+	*bsic = (sb >> 2) & 0x3f;
+
+	/* TS 05.02 Chapter 3.3.2.2.1 SCH Frame Numbers */
+	time->t1 = ((sb >> 23) & 0x01)
+		 | ((sb >> 7) & 0x1fe)
+		 | ((sb << 9) & 0x600);
+
+	time->t2 = (sb >> 18) & 0x1f;
+
+	t3p = ((sb >> 24) & 0x01) | ((sb >> 15) & 0x06);
+	time->t3 = t3p * 10 + 1;
+
+	/* TS 05.02 Chapter 4.3.3 TDMA frame number */
+	time->fn = gsm_gsmtime2fn(time);
+}
+
+int rx_sch_fn(struct l1sched_lchan_state *lchan,
+	      uint32_t fn, uint8_t bid, const sbit_t *bits,
+	      const struct l1sched_meas_set *meas)
+{
+	sbit_t payload[2 * 39];
+	struct gsm_time time;
+	uint8_t sb_info[4];
+	uint8_t bsic;
+	int rc;
+
+	/* Obtain payload from burst */
+	memcpy(payload, bits + 3, 39);
+	memcpy(payload + 39, bits + 3 + 39 + 64, 39);
+
+	/* Attempt to decode */
+	rc = gsm0503_sch_decode(sb_info, payload);
+	if (rc) {
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Received bad SCH burst at fn=%u\n", fn);
+		return rc;
+	}
+
+	/* Decode BSIC and TDMA frame number */
+	decode_sb(&time, &bsic, sb_info);
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Received SCH: bsic=%u, fn=%u, sched_fn=%u\n",
+		bsic, time.fn, lchan->ts->sched->fn_counter_proc);
+
+	/* Check if decoded frame number matches */
+	if (time.fn != fn) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Decoded fn=%u does not match fn=%u provided by scheduler\n",
+			    time.fn, fn);
+		return -EINVAL;
+	}
+
+	/* Update BSIC value in the scheduler state */
+	lchan->ts->sched->bsic = bsic;
+
+	l1sched_handle_data_ind(lchan, (const uint8_t *)&time, sizeof(time),
+				0, 39 * 2, L1SCHED_DT_OTHER);
+
+	return 0;
+}

trxcon/src/sched_lchan_tchf.c

@@ -0,0 +1,366 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/gsm_utils.h>
+
+#include <osmocom/coding/gsm0503_coding.h>
+#include <osmocom/coding/gsm0503_amr_dtx.h>
+#include <osmocom/codec/codec.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+#include <osmocom/bb/trxcon/sched_utils.h>
+
+/* 3GPP TS 45.009, table 3.2.1.3-{1,3}: AMR on Downlink TCH/F.
+ *
+ * +---+---+---+---+---+---+---+---+
+ * | a | b | c | d | e | f | g | h |  Burst 'a' received first
+ * +---+---+---+---+---+---+---+---+
+ *  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   Speech/FACCH frame  (bursts 'a' .. 'h')
+ *
+ * TDMA frame number of burst 'h' is always used as the table index. */
+static const uint8_t sched_tchf_dl_amr_cmi_map[26] = {
+	[11] = 1, /* TCH/F: a=4  / h=11 */
+	[20] = 1, /* TCH/F: a=13 / h=20 */
+	[3]  = 1, /* TCH/F: a=21 / h=3 (21+7=28, 25 is idle -> 29. 29%26=3) */
+};
+
+int rx_tchf_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas)
+{
+	int n_errors = -1, n_bits_total = 0, rc;
+	sbit_t *buffer, *offset;
+	uint8_t l2[128], *mask;
+	size_t l2_len;
+	int amr = 0;
+	uint8_t ft;
+	bool amr_is_cmr;
+
+	/* Set up pointers */
+	mask = &lchan->rx_burst_mask;
+	buffer = lchan->rx_bursts;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Traffic received: fn=%u bid=%u\n", fn, bid);
+
+	/* Align to the first burst of a block */
+	if (*mask == 0x00 && bid != 0)
+		return 0;
+
+	/* Update mask */
+	*mask |= (1 << bid);
+
+	/* Store the measurements */
+	l1sched_lchan_meas_push(lchan, meas);
+
+	/* Copy burst to end of buffer of 8 bursts */
+	offset = buffer + bid * 116 + 464;
+	memcpy(offset, bits + 3, 58);
+	memcpy(offset + 58, bits + 87, 58);
+
+	/* Wait until complete set of bursts */
+	if (bid != 3)
+		return 0;
+
+	/* Calculate AVG of the measurements */
+	l1sched_lchan_meas_avg(lchan, 8);
+
+	/* Check for complete set of bursts */
+	if ((*mask & 0xff) != 0xff) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received incomplete (%s) traffic frame at fn=%u (%u/%u)\n",
+			    l1sched_burst_mask2str(mask, 8), lchan->meas_avg.fn,
+			    lchan->meas_avg.fn % lchan->ts->mf_layout->period,
+			    lchan->ts->mf_layout->period);
+		/* NOTE: do not abort here, give it a try. Maybe we're lucky ;) */
+
+	}
+
+	/* Keep the mask updated */
+	*mask = *mask << 4;
+
+	switch (lchan->tch_mode) {
+	case GSM48_CMODE_SIGN:
+	case GSM48_CMODE_SPEECH_V1: /* FR */
+		rc = gsm0503_tch_fr_decode(l2, buffer,
+			1, 0, &n_errors, &n_bits_total);
+		break;
+	case GSM48_CMODE_SPEECH_EFR: /* EFR */
+		rc = gsm0503_tch_fr_decode(l2, buffer,
+			1, 1, &n_errors, &n_bits_total);
+		break;
+	case GSM48_CMODE_SPEECH_AMR: /* AMR */
+		/* the first FN 4,13,21 defines that CMI is included in frame,
+		 * the first FN 0,8,17 defines that CMR/CMC is included in frame.
+		 * NOTE: A frame ends 7 FN after start.
+		 */
+		amr_is_cmr = !sched_tchf_dl_amr_cmi_map[fn % 26];
+
+		/* we store tch_data + 2 header bytes, the amr variable set to
+		 * 2 will allow us to skip the first 2 bytes in case we did
+		 * receive an FACCH frame instead of a voice frame (we do not
+		 * know this before we actually decode the frame) */
+		amr = 2;
+		rc = gsm0503_tch_afs_decode_dtx(l2 + amr, buffer,
+			amr_is_cmr, lchan->amr.codec, lchan->amr.codecs, &lchan->amr.dl_ft,
+			&lchan->amr.dl_cmr, &n_errors, &n_bits_total, &lchan->amr.last_dtx);
+
+		/* only good speech frames get rtp header */
+		if (rc != GSM_MACBLOCK_LEN && rc >= 4) {
+			if (lchan->amr.last_dtx == AMR_OTHER) {
+				ft = lchan->amr.codec[lchan->amr.dl_ft];
+			} else {
+				/* SID frames will always get Frame Type Index 8 (AMR_SID) */
+				ft = AMR_SID;
+			}
+			rc = osmo_amr_rtp_enc(l2,
+				lchan->amr.codec[lchan->amr.dl_cmr],
+				ft, AMR_GOOD);
+			if (rc < 0)
+				LOGP_LCHAND(lchan, LOGL_ERROR,
+					    "osmo_amr_rtp_enc() returned rc=%d\n", rc);
+		}
+		break;
+	default:
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Invalid TCH mode: %u\n", lchan->tch_mode);
+		return -EINVAL;
+	}
+
+	/* Shift buffer by 4 bursts for interleaving */
+	memcpy(buffer, buffer + 464, 464);
+
+	/* Check decoding result */
+	if (rc < 4) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received bad frame (rc=%d, ber=%d/%d) at fn=%u\n",
+			    rc, n_errors, n_bits_total, lchan->meas_avg.fn);
+
+		/* Send BFI */
+		goto bfi;
+	} else if (rc == GSM_MACBLOCK_LEN) {
+		/* FACCH received, forward it to the higher layers */
+		l1sched_handle_data_ind(lchan, l2 + amr, GSM_MACBLOCK_LEN,
+					n_errors, n_bits_total,
+					L1SCHED_DT_SIGNALING);
+
+		/* Send BFI substituting a stolen TCH frame */
+		n_errors = -1; /* ensure fake measurements */
+		goto bfi;
+	} else {
+		/* A good TCH frame received */
+		l2_len = rc;
+	}
+
+	/* Send a traffic frame to the higher layers */
+	return l1sched_handle_data_ind(lchan, l2, l2_len, n_errors, n_bits_total, L1SCHED_DT_TRAFFIC);
+
+bfi:
+	/* Didn't try to decode, fake measurements */
+	if (n_errors < 0) {
+		lchan->meas_avg = (struct l1sched_meas_set) {
+			.fn = lchan->meas_avg.fn,
+			.toa256 = 0,
+			.rssi = -110,
+		};
+
+		/* No bursts => no errors */
+		n_errors = 0;
+	}
+
+	/* BFI is not applicable in signalling mode */
+	if (lchan->tch_mode == GSM48_CMODE_SIGN) {
+		return l1sched_handle_data_ind(lchan, NULL, 0,
+					       n_errors, n_bits_total,
+					       L1SCHED_DT_TRAFFIC);
+	}
+
+	/* Bad frame indication */
+	l2_len = l1sched_bad_frame_ind(l2, lchan);
+
+	/* Send a BFI frame to the higher layers */
+	return l1sched_handle_data_ind(lchan, l2, l2_len,
+				       n_errors, n_bits_total,
+				       L1SCHED_DT_TRAFFIC);
+}
+
+int tx_tchf_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br)
+{
+	ubit_t *buffer, *offset;
+	const uint8_t *tsc;
+	uint8_t *mask;
+	size_t l2_len;
+	int rc;
+
+	/* Set up pointers */
+	mask = &lchan->tx_burst_mask;
+	buffer = lchan->tx_bursts;
+
+	/* If we have encoded bursts */
+	if (*mask)
+		goto send_burst;
+
+	/* Wait until a first burst in period */
+	if (br->bid > 0)
+		return 0;
+
+	/* Shift buffer by 4 bursts back for interleaving */
+	memcpy(buffer, buffer + 464, 464);
+
+	/* populate the buffer with bursts */
+	if (L1SCHED_PRIM_IS_FACCH(lchan->prim)) {
+		/* Encode payload */
+		rc = gsm0503_tch_fr_encode(buffer, lchan->prim->payload, GSM_MACBLOCK_LEN, 1);
+	} else if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+		int len;
+		uint8_t cmr_codec;
+		int ft, cmr, i;
+		enum osmo_amr_type ft_codec;
+		enum osmo_amr_quality bfi;
+		int8_t sti, cmi;
+		bool amr_fn_is_cmr;
+		/* the first FN 0,8,17 defines that CMI is included in frame,
+		 * the first FN 4,13,21 defines that CMR is included in frame.
+		 */
+		amr_fn_is_cmr = !ul_amr_fn_is_cmi(br->fn);
+
+		len = osmo_amr_rtp_dec(lchan->prim->payload, lchan->prim->payload_len,
+				&cmr_codec, &cmi, &ft_codec,
+				&bfi, &sti);
+		if (len < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR, "Cannot send invalid AMR payload (%zu): %s\n",
+				lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload, lchan->prim->payload_len));
+			goto free_bad_msg;
+		}
+		ft = -1;
+		cmr = -1;
+		for (i = 0; i < lchan->amr.codecs; i++) {
+			if (lchan->amr.codec[i] == ft_codec)
+				ft = i;
+			if (lchan->amr.codec[i] == cmr_codec)
+				cmr = i;
+		}
+		if (ft < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (FT = %d) of RTP frame not in list\n", ft_codec);
+			goto free_bad_msg;
+		}
+		if (amr_fn_is_cmr && lchan->amr.ul_ft != ft) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (FT = %d) of RTP cannot be changed now, but in next frame\n",
+				    ft_codec);
+			goto free_bad_msg;
+		}
+		lchan->amr.ul_ft = ft;
+		if (cmr < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (CMR = %d) of RTP frame not in list\n", cmr_codec);
+		} else {
+			lchan->amr.ul_cmr = cmr;
+		}
+		rc = gsm0503_tch_afs_encode(buffer, lchan->prim->payload + 2,
+			lchan->prim->payload_len - 2, amr_fn_is_cmr,
+			lchan->amr.codec, lchan->amr.codecs,
+			lchan->amr.ul_ft,
+			lchan->amr.ul_cmr);
+	} else {
+		/* Determine and check the payload length */
+		switch (lchan->tch_mode) {
+		case GSM48_CMODE_SIGN:
+		case GSM48_CMODE_SPEECH_V1: /* FR */
+			l2_len = GSM_FR_BYTES;
+			break;
+		case GSM48_CMODE_SPEECH_EFR: /* EFR */
+			l2_len = GSM_EFR_BYTES;
+			break;
+		default:
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Invalid TCH mode: %u, dropping frame...\n",
+				    lchan->tch_mode);
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return -EINVAL;
+		}
+		if (lchan->prim->payload_len != l2_len) {
+			LOGP_LCHAND(lchan, LOGL_ERROR, "Primitive has odd length %zu "
+				    "(expected %zu for TCH or %u for FACCH), so dropping...\n",
+				    lchan->prim->payload_len, l2_len, GSM_MACBLOCK_LEN);
+
+			l1sched_prim_drop(lchan);
+			return -EINVAL;
+		}
+		rc = gsm0503_tch_fr_encode(buffer, lchan->prim->payload, l2_len, 1);
+	}
+
+	if (rc) {
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n",
+			    lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload,
+								   lchan->prim->payload_len));
+free_bad_msg:
+		/* Forget this primitive */
+		l1sched_prim_drop(lchan);
+		return -EINVAL;
+	}
+
+send_burst:
+	/* Determine which burst should be sent */
+	offset = buffer + br->bid * 116;
+
+	/* Update mask */
+	*mask |= (1 << br->bid);
+
+	/* Choose proper TSC */
+	tsc = l1sched_nb_training_bits[lchan->tsc];
+
+	/* Compose a new burst */
+	memset(br->burst, 0, 3); /* TB */
+	memcpy(br->burst + 3, offset, 58); /* Payload 1/2 */
+	memcpy(br->burst + 61, tsc, 26); /* TSC */
+	memcpy(br->burst + 87, offset + 58, 58); /* Payload 2/2 */
+	memset(br->burst + 145, 0, 3); /* TB */
+	br->burst_len = GSM_BURST_LEN;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Scheduled fn=%u burst=%u\n", br->fn, br->bid);
+
+	/* If we have sent the last (4/4) burst */
+	if (*mask == 0x0f) {
+		/* Confirm data / traffic sending */
+		enum l1sched_data_type dt = L1SCHED_PRIM_IS_TCH(lchan->prim) ?
+						L1SCHED_DT_TRAFFIC : L1SCHED_DT_SIGNALING;
+		l1sched_handle_data_cnf(lchan, br->fn, dt);
+
+		/* Forget processed primitive */
+		l1sched_prim_drop(lchan);
+
+		/* Reset mask */
+		*mask = 0x00;
+	}
+
+	return 0;
+}

trxcon/src/sched_lchan_tchh.c

@@ -0,0 +1,587 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2018-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * (C) 2018 by Harald Welte <laforge@gnumonks.org>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/gsm_utils.h>
+
+#include <osmocom/coding/gsm0503_coding.h>
+#include <osmocom/coding/gsm0503_amr_dtx.h>
+#include <osmocom/codec/codec.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+#include <osmocom/bb/trxcon/sched_utils.h>
+
+/* 3GPP TS 45.009, table 3.2.1.3-{2,4}: AMR on Downlink TCH/H.
+ *
+ * +---+---+---+---+---+---+
+ * | a | b | c | d | e | f |  Burst 'a' received first
+ * +---+---+---+---+---+---+
+ *  ^^^^^^^^^^^^^^^^^^^^^^^   FACCH frame  (bursts 'a' .. 'f')
+ *  ^^^^^^^^^^^^^^^           Speech frame (bursts 'a' .. 'd')
+ *
+ * TDMA frame number of burst 'f' is always used as the table index. */
+static const uint8_t sched_tchh_dl_amr_cmi_map[26] = {
+	[15] = 1, /* TCH/H(0): a=4  / d=10 / f=15 */
+	[23] = 1, /* TCH/H(0): a=13 / d=19 / f=23 */
+	[6]  = 1, /* TCH/H(0): a=21 / d=2  / f=6 */
+
+	[16] = 1, /* TCH/H(1): a=5  / d=11 / f=16 */
+	[24] = 1, /* TCH/H(1): a=14 / d=20 / f=24 */
+	[7]  = 1, /* TCH/H(1): a=22 / d=3  / f=7 */
+};
+
+static const uint8_t tch_h0_traffic_block_map[3][4] = {
+	/* B0(0,2,4,6), B1(4,6,8,10), B2(8,10,0,2) */
+	{ 0, 2, 4, 6 },
+	{ 4, 6, 8, 10 },
+	{ 8, 10, 0, 2 },
+};
+
+static const uint8_t tch_h1_traffic_block_map[3][4] = {
+	/* B0(1,3,5,7), B1(5,7,9,11), B2(9,11,1,3) */
+	{ 1, 3, 5, 7 },
+	{ 5, 7, 9, 11 },
+	{ 9, 11, 1, 3 },
+};
+
+static const uint8_t tch_h0_dl_facch_block_map[3][6] = {
+	/* B0(4,6,8,10,13,15), B1(13,15,17,19,21,23), B2(21,23,0,2,4,6) */
+	{ 4, 6, 8, 10, 13, 15 },
+	{ 13, 15, 17, 19, 21, 23 },
+	{ 21, 23, 0, 2, 4, 6 },
+};
+
+static const uint8_t tch_h0_ul_facch_block_map[3][6] = {
+	/* B0(0,2,4,6,8,10), B1(8,10,13,15,17,19), B2(17,19,21,23,0,2) */
+	{ 0, 2, 4, 6, 8, 10 },
+	{ 8, 10, 13, 15, 17, 19 },
+	{ 17, 19, 21, 23, 0, 2 },
+};
+
+static const uint8_t tch_h1_dl_facch_block_map[3][6] = {
+	/* B0(5,7,9,11,14,16), B1(14,16,18,20,22,24), B2(22,24,1,3,5,7) */
+	{ 5, 7, 9, 11, 14, 16 },
+	{ 14, 16, 18, 20, 22, 24 },
+	{ 22, 24, 1, 3, 5, 7 },
+};
+
+const uint8_t tch_h1_ul_facch_block_map[3][6] = {
+	/* B0(1,3,5,7,9,11), B1(9,11,14,16,18,20), B2(18,20,22,24,1,3) */
+	{ 1, 3, 5, 7, 9, 11 },
+	{ 9, 11, 14, 16, 18, 20 },
+	{ 18, 20, 22, 24, 1, 3 },
+};
+
+/* FACCH/H channel mapping for Downlink (see 3GPP TS 45.002, table 1).
+ * This mapping is valid for both FACCH/H(0) and FACCH/H(1).
+ * TDMA frame number of burst 'f' is used as the table index. */
+static const uint8_t sched_tchh_dl_facch_map[26] = {
+	[15] = 1, /* FACCH/H(0): B0(4,6,8,10,13,15) */
+	[16] = 1, /* FACCH/H(1): B0(5,7,9,11,14,16) */
+	[23] = 1, /* FACCH/H(0): B1(13,15,17,19,21,23) */
+	[24] = 1, /* FACCH/H(1): B1(14,16,18,20,22,24) */
+	[6]  = 1, /* FACCH/H(0): B2(21,23,0,2,4,6) */
+	[7]  = 1, /* FACCH/H(1): B2(22,24,1,3,5,7) */
+};
+
+/**
+ * Can a TCH/H block transmission be initiated / finished
+ * on a given frame number and a given channel type?
+ *
+ * See GSM 05.02, clause 7, table 1
+ *
+ * @param  chan   channel type (L1SCHED_TCHH_0 or L1SCHED_TCHH_1)
+ * @param  fn     the current frame number
+ * @param  ul     Uplink or Downlink?
+ * @param  facch  FACCH/H or traffic?
+ * @param  start  init or end of transmission?
+ * @return        true (yes) or false (no)
+ */
+bool l1sched_tchh_block_map_fn(enum l1sched_lchan_type chan,
+	uint32_t fn, bool ul, bool facch, bool start)
+{
+	uint8_t fn_mf;
+	int i = 0;
+
+	/* Just to be sure */
+	OSMO_ASSERT(chan == L1SCHED_TCHH_0 || chan == L1SCHED_TCHH_1);
+
+	/* Calculate a modulo */
+	fn_mf = facch ? (fn % 26) : (fn % 13);
+
+#define MAP_GET_POS(map) \
+	(start ? 0 : ARRAY_SIZE(map[i]) - 1)
+
+#define BLOCK_MAP_FN(map) \
+	do { \
+		if (map[i][MAP_GET_POS(map)] == fn_mf) \
+			return true; \
+	} while (++i < ARRAY_SIZE(map))
+
+	/* Choose a proper block map */
+	if (facch) {
+		if (ul) {
+			if (chan == L1SCHED_TCHH_0)
+				BLOCK_MAP_FN(tch_h0_ul_facch_block_map);
+			else
+				BLOCK_MAP_FN(tch_h1_ul_facch_block_map);
+		} else {
+			if (chan == L1SCHED_TCHH_0)
+				BLOCK_MAP_FN(tch_h0_dl_facch_block_map);
+			else
+				BLOCK_MAP_FN(tch_h1_dl_facch_block_map);
+		}
+	} else {
+		if (chan == L1SCHED_TCHH_0)
+			BLOCK_MAP_FN(tch_h0_traffic_block_map);
+		else
+			BLOCK_MAP_FN(tch_h1_traffic_block_map);
+	}
+
+	return false;
+}
+
+/**
+ * Calculates a frame number of the first burst
+ * using given frame number of the last burst.
+ *
+ * See GSM 05.02, clause 7, table 1
+ *
+ * @param  chan      channel type (L1SCHED_TCHH_0 or L1SCHED_TCHH_1)
+ * @param  last_fn   frame number of the last burst
+ * @param  facch     FACCH/H or traffic?
+ * @return           either frame number of the first burst,
+ *                   or fn=last_fn if calculation failed
+ */
+static uint32_t tchh_block_dl_first_fn(const struct l1sched_lchan_state *lchan,
+				       uint32_t last_fn, bool facch)
+{
+	enum l1sched_lchan_type chan = lchan->type;
+	uint8_t fn_mf, fn_diff;
+	int i = 0;
+
+	/* Just to be sure */
+	OSMO_ASSERT(chan == L1SCHED_TCHH_0 || chan == L1SCHED_TCHH_1);
+
+	/* Calculate a modulo */
+	fn_mf = facch ? (last_fn % 26) : (last_fn % 13);
+
+#define BLOCK_FIRST_FN(map) \
+	do { \
+		if (map[i][ARRAY_SIZE(map[i]) - 1] == fn_mf) { \
+			fn_diff = GSM_TDMA_FN_DIFF(fn_mf, map[i][0]); \
+			return GSM_TDMA_FN_SUB(last_fn, fn_diff); \
+		} \
+	} while (++i < ARRAY_SIZE(map))
+
+	/* Choose a proper block map */
+	if (facch) {
+		if (chan == L1SCHED_TCHH_0)
+			BLOCK_FIRST_FN(tch_h0_dl_facch_block_map);
+		else
+			BLOCK_FIRST_FN(tch_h1_dl_facch_block_map);
+	} else {
+		if (chan == L1SCHED_TCHH_0)
+			BLOCK_FIRST_FN(tch_h0_traffic_block_map);
+		else
+			BLOCK_FIRST_FN(tch_h1_traffic_block_map);
+	}
+
+	LOGP_LCHAND(lchan, LOGL_ERROR,
+		    "Failed to calculate TDMA frame number of the first burst of %s block, "
+		    "using the current fn=%u\n", facch ? "FACCH/H" : "TCH/H", last_fn);
+
+	/* Couldn't calculate the first fn, return the last */
+	return last_fn;
+}
+
+int rx_tchh_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas)
+{
+	int n_errors = -1, n_bits_total = 0, rc;
+	sbit_t *buffer, *offset;
+	uint8_t l2[128], *mask;
+	size_t l2_len;
+	int amr = 0;
+	uint8_t ft;
+	bool fn_is_cmi;
+
+	/* Set up pointers */
+	mask = &lchan->rx_burst_mask;
+	buffer = lchan->rx_bursts;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Traffic received: fn=%u bid=%u\n", fn, bid);
+
+	if (*mask == 0x00) {
+		/* Align to the first burst */
+		if (bid > 0)
+			return 0;
+
+		/* Align reception of the first FACCH/H frame */
+		if (lchan->tch_mode == GSM48_CMODE_SIGN) {
+			if (!l1sched_tchh_facch_start(lchan->type, fn, 0))
+				return 0;
+		} else { /* or TCH/H traffic frame */
+			if (!l1sched_tchh_traffic_start(lchan->type, fn, 0))
+				return 0;
+		}
+	}
+
+	/* Update mask */
+	*mask |= (1 << bid);
+
+	/* Store the measurements */
+	l1sched_lchan_meas_push(lchan, meas);
+
+	/* Copy burst to the end of buffer of 6 bursts */
+	offset = buffer + bid * 116 + 464;
+	memcpy(offset, bits + 3, 58);
+	memcpy(offset + 58, bits + 87, 58);
+
+	/* Wait until the second burst */
+	if (bid != 1)
+		return 0;
+
+	/* Wait for complete set of bursts */
+	if (lchan->tch_mode == GSM48_CMODE_SIGN) {
+		/* FACCH/H is interleaved over 6 bursts */
+		if ((*mask & 0x3f) != 0x3f)
+			goto bfi_shift;
+	} else {
+		/* Traffic is interleaved over 4 bursts */
+		if ((*mask & 0x0f) != 0x0f)
+			goto bfi_shift;
+	}
+
+	/* Skip decoding attempt in case of FACCH/H */
+	if (lchan->dl_ongoing_facch) {
+		lchan->dl_ongoing_facch = false;
+		goto bfi_shift; /* 2/2 BFI */
+	}
+
+	switch (lchan->tch_mode) {
+	case GSM48_CMODE_SIGN:
+	case GSM48_CMODE_SPEECH_V1: /* HR */
+		rc = gsm0503_tch_hr_decode(l2, buffer,
+			!l1sched_tchh_facch_end(lchan->type, fn, 0),
+			&n_errors, &n_bits_total);
+		break;
+	case GSM48_CMODE_SPEECH_AMR: /* AMR */
+		/* the first FN FN 4,13,21 or 5,14,22 defines that CMI is
+		 * included in frame, the first FN FN 0,8,17 or 1,9,18 defines
+		 * that CMR/CMC is included in frame. */
+		fn_is_cmi = sched_tchh_dl_amr_cmi_map[fn % 26];
+
+		/* See comment in function rx_tchf_fn() */
+		amr = 2;
+		rc = gsm0503_tch_ahs_decode_dtx(l2 + amr, buffer,
+			!sched_tchh_dl_facch_map[fn % 26],
+			!fn_is_cmi, lchan->amr.codec, lchan->amr.codecs, &lchan->amr.dl_ft,
+			&lchan->amr.dl_cmr, &n_errors, &n_bits_total, &lchan->amr.last_dtx);
+
+		/* only good speech frames get rtp header */
+		if (rc != GSM_MACBLOCK_LEN && rc >= 4) {
+			if (lchan->amr.last_dtx == AMR_OTHER) {
+				ft = lchan->amr.codec[lchan->amr.dl_ft];
+			} else {
+				/* SID frames will always get Frame Type Index 8 (AMR_SID) */
+				ft = AMR_SID;
+			}
+			rc = osmo_amr_rtp_enc(l2,
+				lchan->amr.codec[lchan->amr.dl_cmr],
+				ft, AMR_GOOD);
+			if (rc < 0)
+				LOGP_LCHAND(lchan, LOGL_ERROR,
+					    "osmo_amr_rtp_enc() returned rc=%d\n", rc);
+		}
+		break;
+	default:
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Invalid TCH mode: %u\n", lchan->tch_mode);
+		return -EINVAL;
+	}
+
+	/* Shift buffer by 4 bursts for interleaving */
+	memcpy(buffer, buffer + 232, 232);
+	memcpy(buffer + 232, buffer + 464, 232);
+
+	/* Shift burst mask */
+	*mask = *mask << 2;
+
+	/* Check decoding result */
+	if (rc < 4) {
+		/* Calculate AVG of the measurements (assuming 4 bursts) */
+		l1sched_lchan_meas_avg(lchan, 4);
+
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received bad frame (rc=%d, ber=%d/%d) at fn=%u\n",
+			    rc, n_errors, n_bits_total, lchan->meas_avg.fn);
+
+		/* Send BFI */
+		goto bfi;
+	} else if (rc == GSM_MACBLOCK_LEN) {
+		/* Skip decoding of the next 2 stolen bursts */
+		lchan->dl_ongoing_facch = true;
+
+		/* Calculate AVG of the measurements (FACCH/H takes 6 bursts) */
+		l1sched_lchan_meas_avg(lchan, 6);
+
+		/* FACCH/H received, forward to the higher layers */
+		l1sched_handle_data_ind(lchan, l2 + amr, GSM_MACBLOCK_LEN,
+					n_errors, n_bits_total,
+					L1SCHED_DT_SIGNALING);
+
+		/* Send BFI substituting 1/2 stolen TCH frames */
+		n_errors = -1; /* ensure fake measurements */
+		goto bfi;
+	} else {
+		/* A good TCH frame received */
+		l2_len = rc;
+
+		/* Calculate AVG of the measurements (traffic takes 4 bursts) */
+		l1sched_lchan_meas_avg(lchan, 4);
+	}
+
+	/* Send a traffic frame to the higher layers */
+	return l1sched_handle_data_ind(lchan, l2, l2_len,
+				       n_errors, n_bits_total,
+				       L1SCHED_DT_TRAFFIC);
+
+bfi_shift:
+	/* Shift buffer */
+	memcpy(buffer, buffer + 232, 232);
+	memcpy(buffer + 232, buffer + 464, 232);
+
+	/* Shift burst mask */
+	*mask = *mask << 2;
+
+bfi:
+	/* Didn't try to decode, fake measurements */
+	if (n_errors < 0) {
+		lchan->meas_avg = (struct l1sched_meas_set) {
+			.fn = tchh_block_dl_first_fn(lchan, fn, false),
+			.toa256 = 0,
+			.rssi = -110,
+		};
+
+		/* No bursts => no errors */
+		n_errors = 0;
+	}
+
+	/* BFI is not applicable in signalling mode */
+	if (lchan->tch_mode == GSM48_CMODE_SIGN) {
+		return l1sched_handle_data_ind(lchan, NULL, 0,
+					       n_errors, n_bits_total,
+					       L1SCHED_DT_SIGNALING);
+	}
+
+	/* Bad frame indication */
+	l2_len = l1sched_bad_frame_ind(l2, lchan);
+
+	/* Send a BFI frame to the higher layers */
+	return l1sched_handle_data_ind(lchan, l2, l2_len,
+				       n_errors, n_bits_total,
+				       L1SCHED_DT_TRAFFIC);
+}
+
+int tx_tchh_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br)
+{
+	ubit_t *buffer, *offset;
+	const uint8_t *tsc;
+	uint8_t *mask;
+	size_t l2_len;
+	int rc;
+
+	/* Set up pointers */
+	mask = &lchan->tx_burst_mask;
+	buffer = lchan->tx_bursts;
+
+	if (br->bid > 0) {
+		/* Align to the first burst */
+		if (*mask == 0x00)
+			return 0;
+		goto send_burst;
+	}
+
+	if (*mask == 0x00) {
+		/* Align transmission of the first FACCH/H frame */
+		if (lchan->tch_mode == GSM48_CMODE_SIGN)
+			if (!l1sched_tchh_facch_start(lchan->type, br->fn, 1))
+				return 0;
+	}
+
+	/* Shift buffer by 2 bursts back for interleaving */
+	memcpy(buffer, buffer + 232, 232);
+
+	/* Also shift TX burst mask */
+	*mask = *mask << 2;
+
+	/* If FACCH/H blocks are still pending */
+	if (lchan->ul_facch_blocks > 2) {
+		memcpy(buffer + 232, buffer + 464, 232);
+		goto send_burst;
+	}
+
+	/* populate the buffer with bursts */
+	if (L1SCHED_PRIM_IS_FACCH(lchan->prim)) {
+		rc = gsm0503_tch_hr_encode(buffer, lchan->prim->payload,  lchan->prim->payload_len);
+		lchan->ul_facch_blocks = 6;
+	} else if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+		int len;
+		uint8_t cmr_codec;
+		int ft, cmr, i;
+		enum osmo_amr_type ft_codec;
+		enum osmo_amr_quality bfi;
+		int8_t sti, cmi;
+		bool amr_fn_is_cmr;
+		/* the first FN 0,8,17 defines that CMI is included in frame,
+		 * the first FN 4,13,21 defines that CMR is included in frame.
+		 */
+		amr_fn_is_cmr = !ul_amr_fn_is_cmi(br->fn);
+
+		len = osmo_amr_rtp_dec(lchan->prim->payload, lchan->prim->payload_len,
+				&cmr_codec, &cmi, &ft_codec,
+				&bfi, &sti);
+		if (len < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR, "Cannot send invalid AMR payload (%zu): %s\n",
+				lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload, lchan->prim->payload_len));
+			goto free_bad_msg;
+		}
+		ft = -1;
+		cmr = -1;
+		for (i = 0; i < lchan->amr.codecs; i++) {
+			if (lchan->amr.codec[i] == ft_codec)
+				ft = i;
+			if (lchan->amr.codec[i] == cmr_codec)
+				cmr = i;
+		}
+		if (ft < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (FT = %d) of RTP frame not in list\n", ft_codec);
+			goto free_bad_msg;
+		}
+		if (amr_fn_is_cmr && lchan->amr.ul_ft != ft) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (FT = %d) of RTP cannot be changed now, but in next frame\n",
+				    ft_codec);
+			goto free_bad_msg;
+		}
+		lchan->amr.ul_ft = ft;
+		if (cmr < 0) {
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Codec (CMR = %d) of RTP frame not in list\n", cmr_codec);
+		} else {
+			lchan->amr.ul_cmr = cmr;
+		}
+		rc = gsm0503_tch_ahs_encode(buffer, lchan->prim->payload + 2,
+			lchan->prim->payload_len - 2, amr_fn_is_cmr,
+			lchan->amr.codec, lchan->amr.codecs,
+			lchan->amr.ul_ft,
+			lchan->amr.ul_cmr);
+	} else {
+		/* Determine and check the payload length */
+		switch (lchan->tch_mode) {
+		case GSM48_CMODE_SIGN:
+		case GSM48_CMODE_SPEECH_V1: /* HR */
+			l2_len = GSM_HR_BYTES + 1;
+			break;
+		default:
+			LOGP_LCHAND(lchan, LOGL_ERROR,
+				    "Invalid TCH mode: %u, dropping frame...\n",
+				    lchan->tch_mode);
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return -EINVAL;
+		}
+		if (lchan->prim->payload_len != l2_len) {
+			LOGP_LCHAND(lchan, LOGL_ERROR, "Primitive has odd length %zu "
+				    "(expected %zu for TCH or %u for FACCH), so dropping...\n",
+				    lchan->prim->payload_len, l2_len, GSM_MACBLOCK_LEN);
+			/* Forget this primitive */
+			l1sched_prim_drop(lchan);
+			return -EINVAL;
+		}
+		rc = gsm0503_tch_hr_encode(buffer, lchan->prim->payload, l2_len);
+	}
+
+	if (rc) {
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n",
+			    lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload,
+								   lchan->prim->payload_len));
+free_bad_msg:
+		/* Forget this primitive */
+		l1sched_prim_drop(lchan);
+		return -EINVAL;
+	}
+
+send_burst:
+	/* Determine which burst should be sent */
+	offset = buffer + br->bid * 116;
+
+	/* Update mask */
+	*mask |= (1 << br->bid);
+
+	/* Choose proper TSC */
+	tsc = l1sched_nb_training_bits[lchan->tsc];
+
+	/* Compose a new burst */
+	memset(br->burst, 0, 3); /* TB */
+	memcpy(br->burst + 3, offset, 58); /* Payload 1/2 */
+	memcpy(br->burst + 61, tsc, 26); /* TSC */
+	memcpy(br->burst + 87, offset + 58, 58); /* Payload 2/2 */
+	memset(br->burst + 145, 0, 3); /* TB */
+	br->burst_len = GSM_BURST_LEN;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Scheduled fn=%u burst=%u\n", br->fn, br->bid);
+
+	/* In case of a FACCH/H frame, one block less */
+	if (lchan->ul_facch_blocks)
+		lchan->ul_facch_blocks--;
+
+	if ((*mask & 0x0f) == 0x0f) {
+		/**
+		 * If no more FACCH/H blocks pending,
+		 * confirm data / traffic sending
+		 */
+		if (!lchan->ul_facch_blocks) {
+			enum l1sched_data_type dt = L1SCHED_PRIM_IS_TCH(lchan->prim) ?
+							L1SCHED_DT_TRAFFIC : L1SCHED_DT_SIGNALING;
+			l1sched_handle_data_cnf(lchan, br->fn, dt);
+		}
+
+		/* Forget processed primitive */
+		l1sched_prim_drop(lchan);
+	}
+
+	return 0;
+}

trxcon/src/sched_lchan_xcch.c

@@ -0,0 +1,178 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/coding/gsm0503_coding.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+int rx_data_fn(struct l1sched_lchan_state *lchan,
+	       uint32_t fn, uint8_t bid, const sbit_t *bits,
+	       const struct l1sched_meas_set *meas)
+{
+	uint8_t l2[GSM_MACBLOCK_LEN], *mask;
+	int n_errors, n_bits_total, rc;
+	sbit_t *buffer, *offset;
+
+	/* Set up pointers */
+	mask = &lchan->rx_burst_mask;
+	buffer = lchan->rx_bursts;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Data received: fn=%u bid=%u\n", fn, bid);
+
+	/* Align to the first burst of a block */
+	if (*mask == 0x00 && bid != 0)
+		return 0;
+
+	/* Update mask */
+	*mask |= (1 << bid);
+
+	/* Store the measurements */
+	l1sched_lchan_meas_push(lchan, meas);
+
+	/* Copy burst to buffer of 4 bursts */
+	offset = buffer + bid * 116;
+	memcpy(offset, bits + 3, 58);
+	memcpy(offset + 58, bits + 87, 58);
+
+	/* Wait until complete set of bursts */
+	if (bid != 3)
+		return 0;
+
+	/* Calculate AVG of the measurements */
+	l1sched_lchan_meas_avg(lchan, 4);
+
+	/* Check for complete set of bursts */
+	if ((*mask & 0xf) != 0xf) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received incomplete (%s) data frame at fn=%u (%u/%u)\n",
+			    l1sched_burst_mask2str(mask, 4), lchan->meas_avg.fn,
+			    lchan->meas_avg.fn % lchan->ts->mf_layout->period,
+			    lchan->ts->mf_layout->period);
+		/* NOTE: xCCH has an insane amount of redundancy for error
+		 * correction, so even just 2 valid bursts might be enough
+		 * to reconstruct some L2 frames. This is why we do not
+		 * abort here. */
+	}
+
+	/* Keep the mask updated */
+	*mask = *mask << 4;
+
+	/* Attempt to decode */
+	rc = gsm0503_xcch_decode(l2, buffer, &n_errors, &n_bits_total);
+	if (rc) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Received bad frame (rc=%d, ber=%d/%d) at fn=%u\n",
+			    rc, n_errors, n_bits_total, lchan->meas_avg.fn);
+	}
+
+	/* Send a L2 frame to the higher layers */
+	return l1sched_handle_data_ind(lchan, l2, rc ? 0 : GSM_MACBLOCK_LEN,
+				       n_errors, n_bits_total,
+				       L1SCHED_DT_SIGNALING);
+}
+
+int tx_data_fn(struct l1sched_lchan_state *lchan,
+	       struct l1sched_burst_req *br)
+{
+	ubit_t *buffer, *offset;
+	const uint8_t *tsc;
+	uint8_t *mask;
+	int rc;
+
+	/* Set up pointers */
+	mask = &lchan->tx_burst_mask;
+	buffer = lchan->tx_bursts;
+
+	if (br->bid > 0) {
+		/* If we have encoded bursts */
+		if (*mask)
+			goto send_burst;
+		else
+			return 0;
+	}
+
+	/* Check the prim payload length */
+	if (lchan->prim->payload_len != GSM_MACBLOCK_LEN) {
+		LOGP_LCHAND(lchan, LOGL_ERROR,
+			    "Primitive has odd length %zu (expected %u), so dropping...\n",
+			    lchan->prim->payload_len, GSM_MACBLOCK_LEN);
+
+		l1sched_prim_drop(lchan);
+		return -EINVAL;
+	}
+
+	/* Encode payload */
+	rc = gsm0503_xcch_encode(buffer, lchan->prim->payload);
+	if (rc) {
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n",
+			    lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload,
+								   lchan->prim->payload_len));
+
+		/* Forget this primitive */
+		l1sched_prim_drop(lchan);
+
+		return -EINVAL;
+	}
+
+send_burst:
+	/* Determine which burst should be sent */
+	offset = buffer + br->bid * 116;
+
+	/* Update mask */
+	*mask |= (1 << br->bid);
+
+	/* Choose proper TSC */
+	tsc = l1sched_nb_training_bits[lchan->tsc];
+
+	/* Compose a new burst */
+	memset(br->burst, 0, 3); /* TB */
+	memcpy(br->burst + 3, offset, 58); /* Payload 1/2 */
+	memcpy(br->burst + 61, tsc, 26); /* TSC */
+	memcpy(br->burst + 87, offset + 58, 58); /* Payload 2/2 */
+	memset(br->burst + 145, 0, 3); /* TB */
+	br->burst_len = GSM_BURST_LEN;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Scheduled fn=%u burst=%u\n", br->fn, br->bid);
+
+	/* If we have sent the last (4/4) burst */
+	if ((*mask & 0x0f) == 0x0f) {
+		/* Confirm data sending */
+		l1sched_handle_data_cnf(lchan, br->fn, L1SCHED_DT_SIGNALING);
+
+		/* Forget processed primitive */
+		l1sched_prim_drop(lchan);
+
+		/* Reset mask */
+		*mask = 0x00;
+	}
+
+	return 0;
+}

trxcon/src/sched_prim.c

@@ -0,0 +1,558 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: primitive management
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <talloc.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/linuxlist.h>
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+/**
+ * Initializes a new primitive by allocating memory
+ * and filling some meta-information (e.g. lchan type).
+ *
+ * @param  ctx     parent talloc context
+ * @param  pl_len  prim payload length
+ * @param  type    prim payload type
+ * @param  chan_nr RSL channel description (used to set a proper chan)
+ * @param  link_id RSL link description (used to set a proper chan)
+ * @return         allocated primitive or NULL
+ */
+static struct l1sched_ts_prim *prim_alloc(void *ctx, size_t pl_len,
+					  enum l1sched_ts_prim_type type,
+					  uint8_t chan_nr, uint8_t link_id)
+{
+	enum l1sched_lchan_type lchan_type;
+	struct l1sched_ts_prim *prim;
+
+	/* Determine lchan type */
+	lchan_type = l1sched_chan_nr2lchan_type(chan_nr, link_id);
+	if (!lchan_type) {
+		/* TODO: use proper logging context */
+		LOGP(DLGLOBAL, LOGL_ERROR, "Couldn't determine lchan type "
+		     "for chan_nr=%02x and link_id=%02x\n", chan_nr, link_id);
+		return NULL;
+	}
+
+	/* Allocate a new primitive */
+	prim = talloc_zero_size(ctx, sizeof(*prim) + pl_len);
+	if (prim == NULL)
+		return NULL;
+
+	/* Init primitive header */
+	prim->payload_len = pl_len;
+	prim->chan = lchan_type;
+	prim->type = type;
+
+	return prim;
+}
+
+/**
+ * Adds a primitive to the end of transmit queue of a particular
+ * timeslot, whose index is parsed from chan_nr.
+ *
+ * @param  sched   scheduler instance
+ * @param  chan_nr RSL channel description
+ * @param  link_id RSL link description
+ * @param  pl      Payload data
+ * @param  pl_len  Payload length
+ * @return         queued primitive or NULL
+ */
+struct l1sched_ts_prim *l1sched_prim_push(struct l1sched_state *sched,
+					  enum l1sched_ts_prim_type type,
+					  uint8_t chan_nr, uint8_t link_id,
+					  const uint8_t *pl, size_t pl_len)
+{
+	struct l1sched_ts_prim *prim;
+	struct l1sched_ts *ts;
+	uint8_t tn;
+
+	/* Determine TS index */
+	tn = chan_nr & 0x7;
+
+	/* Check whether required timeslot is allocated and configured */
+	ts = sched->ts[tn];
+	if (ts == NULL || ts->mf_layout == NULL) {
+		LOGP_SCHEDC(sched, LOGL_ERROR, "Timeslot %u isn't configured\n", tn);
+		return NULL;
+	}
+
+	prim = prim_alloc(ts, pl_len, type, chan_nr, link_id);
+	if (prim == NULL)
+		return NULL;
+
+	memcpy(&prim->payload[0], pl, pl_len);
+
+	/* Add primitive to TS transmit queue */
+	llist_add_tail(&prim->list, &ts->tx_prims);
+
+	return prim;
+}
+
+/**
+ * Composes a new primitive from cached RR Measurement Report.
+ *
+ * @param  lchan lchan to assign a primitive
+ * @return       SACCH primitive to be transmitted
+ */
+static struct l1sched_ts_prim *prim_compose_mr(struct l1sched_lchan_state *lchan)
+{
+	struct l1sched_ts_prim *prim;
+	bool cached;
+
+	/* Allocate a new primitive */
+	prim = prim_alloc(lchan, GSM_MACBLOCK_LEN, L1SCHED_PRIM_DATA,
+			  l1sched_lchan_desc[lchan->type].chan_nr,
+			  L1SCHED_CH_LID_SACCH);
+	OSMO_ASSERT(prim != NULL);
+
+	/* Check if the MR cache is populated (verify LAPDm header) */
+	cached = (lchan->sacch.mr_cache[2] != 0x00
+		&& lchan->sacch.mr_cache[3] != 0x00
+		&& lchan->sacch.mr_cache[4] != 0x00);
+	if (!cached) {
+		memcpy(&lchan->sacch.mr_cache[0],
+		       &lchan->ts->sched->sacch_cache[0],
+		       sizeof(lchan->sacch.mr_cache));
+	}
+
+	/* Compose a new Measurement Report primitive */
+	memcpy(&prim->payload[0], &lchan->sacch.mr_cache[0], GSM_MACBLOCK_LEN);
+
+	/* Inform about the cache usage count */
+	if (++lchan->sacch.mr_cache_usage > 5) {
+		LOGP_LCHAND(lchan, LOGL_NOTICE,
+			    "SACCH MR cache usage count=%u > 5 "
+			    "=> ancient measurements, please fix!\n",
+			    lchan->sacch.mr_cache_usage);
+	}
+
+	LOGP_LCHAND(lchan, LOGL_NOTICE, "Using cached Measurement Report\n");
+
+	return prim;
+}
+
+/**
+ * Dequeues a SACCH primitive from transmit queue, if present.
+ * Otherwise dequeues a cached Measurement Report (the last
+ * received one). Finally, if the cache is empty, a "dummy"
+ * measurement report is used.
+ *
+ * According to 3GPP TS 04.08, section 3.4.1, SACCH channel
+ * accompanies either a traffic or a signaling channel. It
+ * has the particularity that continuous transmission must
+ * occur in both directions, so on the Uplink direction
+ * measurement result messages are sent at each possible
+ * occasion when nothing else has to be sent. The LAPDm
+ * fill frames (0x01, 0x03, 0x01, 0x2b, ...) are not
+ * applicable on SACCH channels!
+ *
+ * Unfortunately, 3GPP TS 04.08 doesn't clearly state
+ * which "else messages" besides Measurement Reports
+ * can be send by the MS on SACCH channels. However,
+ * in sub-clause 3.4.1 it's stated that the interval
+ * between two successive measurement result messages
+ * shall not exceed one L2 frame.
+ *
+ * @param  queue transmit queue to take a prim from
+ * @param  lchan lchan to assign a primitive
+ * @return       SACCH primitive to be transmitted
+ */
+static struct l1sched_ts_prim *prim_dequeue_sacch(struct llist_head *queue,
+	struct l1sched_lchan_state *lchan)
+{
+	struct l1sched_ts_prim *prim_nmr = NULL;
+	struct l1sched_ts_prim *prim_mr = NULL;
+	struct l1sched_ts_prim *prim;
+	bool mr_now;
+
+	/* Shall we transmit MR now? */
+	mr_now = !lchan->sacch.mr_tx_last;
+
+#define PRIM_IS_MR(prim) \
+	(prim->payload[5] == GSM48_PDISC_RR \
+		&& prim->payload[6] == GSM48_MT_RR_MEAS_REP)
+
+	/* Iterate over all primitives in the queue */
+	llist_for_each_entry(prim, queue, list) {
+		/* We are looking for particular channel */
+		if (prim->chan != lchan->type)
+			continue;
+
+		/* Look for a Measurement Report */
+		if (!prim_mr && PRIM_IS_MR(prim))
+			prim_mr = prim;
+
+		/* Look for anything else */
+		if (!prim_nmr && !PRIM_IS_MR(prim))
+			prim_nmr = prim;
+
+		/* Should we look further? */
+		if (mr_now && prim_mr)
+			break; /* MR was found */
+		else if (!mr_now && prim_nmr)
+			break; /* something else was found */
+	}
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG,
+		    "SACCH MR selection: mr_tx_last=%d prim_mr=%p prim_nmr=%p\n",
+		    lchan->sacch.mr_tx_last, prim_mr, prim_nmr);
+
+	/* Prioritize non-MR prim if possible */
+	if (mr_now && prim_mr)
+		prim = prim_mr;
+	else if (!mr_now && prim_nmr)
+		prim = prim_nmr;
+	else if (!mr_now && prim_mr)
+		prim = prim_mr;
+	else /* Nothing was found */
+		prim = NULL;
+
+	/* Have we found what we were looking for? */
+	if (prim) /* Dequeue if so */
+		llist_del(&prim->list);
+	else /* Otherwise compose a new MR */
+		prim = prim_compose_mr(lchan);
+
+	/* Update the cached report */
+	if (prim == prim_mr) {
+		memcpy(lchan->sacch.mr_cache,
+			prim->payload, GSM_MACBLOCK_LEN);
+		lchan->sacch.mr_cache_usage = 0;
+
+		LOGP_LCHAND(lchan, LOGL_DEBUG, "SACCH MR cache has been updated\n");
+	}
+
+	/* Update the MR transmission state */
+	lchan->sacch.mr_tx_last = PRIM_IS_MR(prim);
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "SACCH decision: %s\n",
+		    PRIM_IS_MR(prim) ? "Measurement Report" : "data frame");
+
+	return prim;
+}
+
+/* Dequeues a primitive of a given channel type */
+static struct l1sched_ts_prim *prim_dequeue_one(struct llist_head *queue,
+	enum l1sched_lchan_type lchan_type)
+{
+	struct l1sched_ts_prim *prim;
+
+	/**
+	 * There is no need to use the 'safe' list iteration here
+	 * as an item removal is immediately followed by return.
+	 */
+	llist_for_each_entry(prim, queue, list) {
+		if (prim->chan == lchan_type) {
+			llist_del(&prim->list);
+			return prim;
+		}
+	}
+
+	return NULL;
+}
+
+/**
+ * Dequeues either a FACCH, or a speech TCH primitive
+ * of a given channel type (Lm or Bm).
+ *
+ * Note: we could avoid 'lchan_type' parameter and just
+ * check the prim's channel type using L1SCHED_CHAN_IS_TCH(),
+ * but the current approach is a bit more flexible,
+ * and allows one to have both sub-slots of TCH/H
+ * enabled on same timeslot e.g. for testing...
+ *
+ * @param  queue      transmit queue to take a prim from
+ * @param  lchan_type required channel type of a primitive,
+ *                    e.g. L1SCHED_TCHF, L1SCHED_TCHH_0, or L1SCHED_TCHH_1
+ * @param  facch      FACCH (true) or speech (false) prim?
+ * @return            either a FACCH, or a TCH primitive if found,
+ *                    otherwise NULL
+ */
+static struct l1sched_ts_prim *prim_dequeue_tch(struct llist_head *queue,
+	enum l1sched_lchan_type lchan_type, bool facch)
+{
+	struct l1sched_ts_prim *prim;
+
+	/**
+	 * There is no need to use the 'safe' list iteration here
+	 * as an item removal is immediately followed by return.
+	 */
+	llist_for_each_entry(prim, queue, list) {
+		if (prim->chan != lchan_type)
+			continue;
+
+		/* Either FACCH, or not FACCH */
+		if (L1SCHED_PRIM_IS_FACCH(prim) != facch)
+			continue;
+
+		llist_del(&prim->list);
+		return prim;
+	}
+
+	return NULL;
+}
+
+/**
+ * Dequeues either a TCH/F, or a FACCH/F prim (preferred).
+ * If a FACCH/F prim is found, one TCH/F prim is being
+ * dropped (i.e. replaced).
+ *
+ * @param  queue a transmit queue to take a prim from
+ * @return       either a FACCH/F, or a TCH/F primitive,
+ *               otherwise NULL
+ */
+static struct l1sched_ts_prim *prim_dequeue_tch_f(struct llist_head *queue)
+{
+	struct l1sched_ts_prim *facch;
+	struct l1sched_ts_prim *tch;
+
+	/* Attempt to find a pair of both FACCH/F and TCH/F frames */
+	facch = prim_dequeue_tch(queue, L1SCHED_TCHF, true);
+	tch = prim_dequeue_tch(queue, L1SCHED_TCHF, false);
+
+	/* Prioritize FACCH/F, if found */
+	if (facch) {
+		/* One TCH/F prim is replaced */
+		if (tch)
+			talloc_free(tch);
+		return facch;
+	} else if (tch) {
+		/* Only TCH/F prim was found */
+		return tch;
+	} else {
+		/* Nothing was found, e.g. when only SACCH frames are in queue */
+		return NULL;
+	}
+}
+
+/**
+ * Dequeues either a TCH/H, or a FACCH/H prim (preferred).
+ * If a FACCH/H prim is found, two TCH/H prims are being
+ * dropped (i.e. replaced).
+ *
+ * According to GSM 05.02, the following blocks can be used
+ * to carry FACCH/H data (see clause 7, table 1 of 9):
+ *
+ * UL FACCH/H0:
+ * B0(0,2,4,6,8,10), B1(8,10,13,15,17,19), B2(17,19,21,23,0,2)
+ *
+ * UL FACCH/H1:
+ * B0(1,3,5,7,9,11), B1(9,11,14,16,18,20), B2(18,20,22,24,1,3)
+ *
+ * where the numbers within brackets are fn % 26.
+ *
+ * @param  queue      transmit queue to take a prim from
+ * @param  fn         the current frame number
+ * @param  lchan_type required channel type of a primitive,
+ * @return            either a FACCH/H, or a TCH/H primitive,
+ *                    otherwise NULL
+ */
+static struct l1sched_ts_prim *prim_dequeue_tch_h(struct llist_head *queue,
+	uint32_t fn, enum l1sched_lchan_type lchan_type)
+{
+	struct l1sched_ts_prim *facch;
+	struct l1sched_ts_prim *tch;
+	bool facch_now;
+
+	/* May we initiate an UL FACCH/H frame transmission now? */
+	facch_now = l1sched_tchh_facch_start(lchan_type, fn, true);
+	if (!facch_now) /* Just dequeue a TCH/H prim */
+		goto no_facch;
+
+	/* If there are no FACCH/H prims in the queue */
+	facch = prim_dequeue_tch(queue, lchan_type, true);
+	if (!facch) /* Just dequeue a TCH/H prim */
+		goto no_facch;
+
+	/* FACCH/H prim replaces two TCH/F prims */
+	tch = prim_dequeue_tch(queue, lchan_type, false);
+	if (tch) {
+		/* At least one TCH/H prim is dropped */
+		talloc_free(tch);
+
+		/* Attempt to find another */
+		tch = prim_dequeue_tch(queue, lchan_type, false);
+		if (tch) /* Drop the second TCH/H prim */
+			talloc_free(tch);
+	}
+
+	return facch;
+
+no_facch:
+	return prim_dequeue_tch(queue, lchan_type, false);
+}
+
+/**
+ * Dequeues a single primitive of required type
+ * from a specified transmit queue.
+ *
+ * @param  queue      a transmit queue to take a prim from
+ * @param  fn         the current frame number (used for FACCH/H)
+ * @param  lchan      logical channel state
+ * @return            a primitive or NULL if not found
+ */
+struct l1sched_ts_prim *l1sched_prim_dequeue(struct llist_head *queue,
+	uint32_t fn, struct l1sched_lchan_state *lchan)
+{
+	/* SACCH is unorthodox, see 3GPP TS 04.08, section 3.4.1 */
+	if (L1SCHED_CHAN_IS_SACCH(lchan->type))
+		return prim_dequeue_sacch(queue, lchan);
+
+	/* There is nothing to dequeue */
+	if (llist_empty(queue))
+		return NULL;
+
+	switch (lchan->type) {
+	/* TCH/F requires FACCH/F prioritization */
+	case L1SCHED_TCHF:
+		return prim_dequeue_tch_f(queue);
+
+	/* FACCH/H prioritization is a bit more complex */
+	case L1SCHED_TCHH_0:
+	case L1SCHED_TCHH_1:
+		return prim_dequeue_tch_h(queue, fn, lchan->type);
+
+	/* Other kinds of logical channels */
+	default:
+		return prim_dequeue_one(queue, lchan->type);
+	}
+}
+
+/**
+ * Drops the current primitive of specified logical channel
+ *
+ * @param lchan a logical channel to drop prim from
+ */
+void l1sched_prim_drop(struct l1sched_lchan_state *lchan)
+{
+	/* Forget this primitive */
+	talloc_free(lchan->prim);
+	lchan->prim = NULL;
+}
+
+/**
+ * Assigns a dummy primitive to a lchan depending on its type.
+ * Could be used when there is nothing to transmit, but
+ * CBTX (Continuous Burst Transmission) is assumed.
+ *
+ * @param  lchan lchan to assign a primitive
+ * @return       zero in case of success, otherwise a error code
+ */
+int l1sched_prim_dummy(struct l1sched_lchan_state *lchan)
+{
+	enum l1sched_lchan_type chan = lchan->type;
+	uint8_t tch_mode = lchan->tch_mode;
+	struct l1sched_ts_prim *prim;
+	uint8_t prim_buffer[40];
+	size_t prim_len = 0;
+	int i;
+
+	/**
+	 * TS 144.006, section 8.4.2.3 "Fill frames"
+	 * A fill frame is a UI command frame for SAPI 0, P=0
+	 * and with an information field of 0 octet length.
+	 */
+	static const uint8_t lapdm_fill_frame[] = {
+		0x01, 0x03, 0x01, 0x2b,
+		/* Pending part is to be randomized */
+	};
+
+	/* Make sure that there is no existing primitive */
+	OSMO_ASSERT(lchan->prim == NULL);
+	/* Not applicable for SACCH! */
+	OSMO_ASSERT(!L1SCHED_CHAN_IS_SACCH(lchan->type));
+
+	/**
+	 * Determine what actually should be generated:
+	 * TCH in GSM48_CMODE_SIGN: LAPDm fill frame;
+	 * TCH in other modes: silence frame;
+	 * other channels: LAPDm fill frame.
+	 */
+	if (L1SCHED_CHAN_IS_TCH(chan) && L1SCHED_TCH_MODE_IS_SPEECH(tch_mode)) {
+		/* Bad frame indication */
+		prim_len = l1sched_bad_frame_ind(prim_buffer, lchan);
+	} else if (L1SCHED_CHAN_IS_TCH(chan) && L1SCHED_TCH_MODE_IS_DATA(tch_mode)) {
+		/* FIXME: should we do anything for CSD? */
+		return 0;
+	} else {
+		/* Copy LAPDm fill frame's header */
+		memcpy(prim_buffer, lapdm_fill_frame, sizeof(lapdm_fill_frame));
+
+		/**
+		 * TS 144.006, section 5.2 "Frame delimitation and fill bits"
+		 * Except for the first octet containing fill bits which shall
+		 * be set to the binary value "00101011", each fill bit should
+		 * be set to a random value when sent by the network.
+		 */
+		for (i = sizeof(lapdm_fill_frame); i < GSM_MACBLOCK_LEN; i++)
+			prim_buffer[i] = (uint8_t) rand();
+
+		/* Define a prim length */
+		prim_len = GSM_MACBLOCK_LEN;
+	}
+
+	/* Nothing to allocate / assign */
+	if (!prim_len)
+		return 0;
+
+	/* Allocate a new primitive */
+	prim = talloc_zero_size(lchan, sizeof(struct l1sched_ts_prim) + prim_len);
+	if (prim == NULL)
+		return -ENOMEM;
+
+	/* Init primitive header */
+	prim->payload_len = prim_len;
+	prim->chan = lchan->type;
+
+	/* Fill in the payload */
+	memcpy(prim->payload, prim_buffer, prim_len);
+
+	/* Assign the current prim */
+	lchan->prim = prim;
+
+	LOGP_LCHAND(lchan, LOGL_DEBUG, "Transmitting a dummy / silence frame\n");
+
+	return 0;
+}
+
+/**
+ * Flushes a queue of primitives
+ *
+ * @param list list of prims going to be flushed
+ */
+void l1sched_prim_flush_queue(struct llist_head *list)
+{
+	struct l1sched_ts_prim *prim, *prim_next;
+
+	llist_for_each_entry_safe(prim, prim_next, list, list) {
+		llist_del(&prim->list);
+		talloc_free(prim);
+	}
+}

trxcon/src/sched_trx.c

@@ -0,0 +1,877 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: GSM PHY routines
+ *
+ * (C) 2017-2022 by Vadim Yanitskiy <axilirator@gmail.com>
+ * Contributions by sysmocom - s.f.m.c. GmbH
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <error.h>
+#include <errno.h>
+#include <string.h>
+#include <talloc.h>
+#include <stdbool.h>
+
+#include <osmocom/gsm/a5.h>
+#include <osmocom/gsm/protocol/gsm_08_58.h>
+#include <osmocom/core/bits.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/linuxlist.h>
+
+#include <osmocom/bb/l1sched/l1sched.h>
+#include <osmocom/bb/l1sched/logging.h>
+
+/* Logging categories to be used for common/data messages */
+int l1sched_log_cat_common = DLGLOBAL;
+int l1sched_log_cat_data = DLGLOBAL;
+
+/* "Dummy" Measurement Report */
+static const uint8_t meas_rep_dummy[] = {
+	/* L1 SACCH pseudo-header */
+	0x0f, 0x00,
+
+	/* LAPDm header */
+	0x01, 0x03, 0x49,
+
+	/* RR Management messages, Measurement Report */
+	0x06, 0x15,
+
+	/* Measurement results (see 3GPP TS 44.018, section 10.5.2.20):
+	 *   0... .... = BA-USED: 0
+	 *   .0.. .... = DTX-USED: DTX was not used
+	 *   ..11 0110 = RXLEV-FULL-SERVING-CELL: -57 <= x < -56 dBm (54)
+	 *   0... .... = 3G-BA-USED: 0
+	 *   .1.. .... = MEAS-VALID: The measurement results are not valid
+	 *   ..11 0110 = RXLEV-SUB-SERVING-CELL: -57 <= x < -56 dBm (54)
+	 *   0... .... = SI23_BA_USED: 0
+	 *   .000 .... = RXQUAL-FULL-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
+	 *   .... 000. = RXQUAL-SUB-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
+	 *   .... ...1  11.. .... = NO-NCELL-M: Neighbour cell information not available */
+	0x36, 0x76, 0x01, 0xc0,
+
+	/* 0** -- Padding with zeroes */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static int l1sched_cfg_pchan_comb_req(struct l1sched_state *sched,
+				      uint8_t tn, enum gsm_phys_chan_config pchan)
+{
+	const struct l1sched_config_req cr = {
+		.type = L1SCHED_CFG_PCHAN_COMB,
+		.pchan_comb = {
+			.tn = tn,
+			.pchan = pchan,
+		},
+	};
+
+	return l1sched_handle_config_req(sched, &cr);
+}
+
+static void l1sched_a5_burst_enc(struct l1sched_lchan_state *lchan,
+				 struct l1sched_burst_req *br);
+
+static void sched_frame_clck_cb(struct l1sched_state *sched)
+{
+	struct l1sched_burst_req br[TRX_TS_COUNT];
+	const struct l1sched_tdma_frame *frame;
+	struct l1sched_lchan_state *lchan;
+	l1sched_lchan_tx_func *handler;
+	enum l1sched_lchan_type chan;
+	uint8_t offset;
+	struct l1sched_ts *ts;
+	unsigned int tn;
+
+	/* Advance TDMA frame number in order to give the transceiver
+	 * more time to handle the burst before the actual transmission. */
+	const uint32_t fn = GSM_TDMA_FN_SUM(sched->fn_counter_proc,
+					    sched->fn_counter_advance);
+
+	/* Iterate over timeslot list */
+	for (tn = 0; tn < ARRAY_SIZE(br); tn++) {
+		/* Initialize the buffer for this timeslot */
+		br[tn] = (struct l1sched_burst_req) {
+			.fn = fn,
+			.tn = tn,
+			.burst_len = 0, /* NOPE.ind */
+		};
+
+		/* Timeslot is not allocated */
+		ts = sched->ts[tn];
+		if (ts == NULL)
+			continue;
+
+		/* Timeslot is not configured */
+		if (ts->mf_layout == NULL)
+			continue;
+
+		/* Get frame from multiframe */
+		offset = fn % ts->mf_layout->period;
+		frame = ts->mf_layout->frames + offset;
+
+		/* Get required info from frame */
+		br[tn].bid = frame->ul_bid;
+		chan = frame->ul_chan;
+		handler = l1sched_lchan_desc[chan].tx_fn;
+
+		/* Omit lchans without handler */
+		if (!handler)
+			continue;
+
+		/* Make sure that lchan was allocated and activated */
+		lchan = l1sched_find_lchan(ts, chan);
+		if (lchan == NULL)
+			continue;
+
+		/* Omit inactive lchans */
+		if (!lchan->active)
+			continue;
+
+		/**
+		 * If we aren't processing any primitive yet,
+		 * attempt to obtain a new one from queue
+		 */
+		if (lchan->prim == NULL)
+			lchan->prim = l1sched_prim_dequeue(&ts->tx_prims, fn, lchan);
+
+		/* TODO: report TX buffers health to the higher layers */
+
+		/* If CBTX (Continuous Burst Transmission) is assumed */
+		if (l1sched_lchan_desc[chan].flags & L1SCHED_CH_FLAG_CBTX) {
+			/**
+			 * Probably, a TX buffer is empty. Nevertheless,
+			 * we shall continuously transmit anything on
+			 * CBTX channels.
+			 */
+			if (lchan->prim == NULL)
+				l1sched_prim_dummy(lchan);
+		}
+
+		/* If there is no primitive, do nothing */
+		if (lchan->prim == NULL)
+			continue;
+
+		/* Handover RACH needs to be handled regardless of the
+		 * current channel type and the associated handler. */
+		if (L1SCHED_PRIM_IS_RACH(lchan->prim) && lchan->prim->chan != L1SCHED_RACH)
+			handler = l1sched_lchan_desc[L1SCHED_RACH].tx_fn;
+
+		/* Poke lchan handler */
+		handler(lchan, &br[tn]);
+
+		/* Perform A5/X burst encryption if required */
+		if (lchan->a5.algo)
+			l1sched_a5_burst_enc(lchan, &br[tn]);
+	}
+
+	/* Send all bursts for this TDMA frame */
+	for (tn = 0; tn < ARRAY_SIZE(br); tn++)
+		l1sched_handle_burst_req(sched, &br[tn]);
+}
+
+void l1sched_logging_init(int log_cat_common, int log_cat_data)
+{
+	l1sched_log_cat_common = log_cat_common;
+	l1sched_log_cat_data = log_cat_data;
+}
+
+struct l1sched_state *l1sched_alloc(void *ctx, const struct l1sched_cfg *cfg, void *priv)
+{
+	struct l1sched_state *sched;
+
+	sched = talloc(ctx, struct l1sched_state);
+	if (!sched)
+		return NULL;
+
+	*sched = (struct l1sched_state) {
+		/* .clock_timer is set up in l1sched_clck_correct() */
+		.clock_cb = &sched_frame_clck_cb,
+		.fn_counter_advance = cfg->fn_advance,
+		.priv = priv,
+	};
+
+	memcpy(&sched->sacch_cache[0], &meas_rep_dummy[0], sizeof(meas_rep_dummy));
+
+	if (cfg->log_prefix == NULL)
+		sched->log_prefix = talloc_asprintf(sched, "l1sched[0x%p]: ", sched);
+	else
+		sched->log_prefix = talloc_strdup(sched, cfg->log_prefix);
+
+	return sched;
+}
+
+void l1sched_free(struct l1sched_state *sched)
+{
+	unsigned int tn;
+
+	if (sched == NULL)
+		return;
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE, "Shutdown scheduler\n");
+
+	/* Free all potentially allocated timeslots */
+	for (tn = 0; tn < ARRAY_SIZE(sched->ts); tn++)
+		l1sched_del_ts(sched, tn);
+
+	l1sched_clck_reset(sched);
+	talloc_free(sched);
+}
+
+void l1sched_reset(struct l1sched_state *sched, bool reset_clock)
+{
+	unsigned int tn;
+
+	if (sched == NULL)
+		return;
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE, "Reset scheduler %s\n",
+		    reset_clock ? "and clock counter" : "");
+
+	/* Free all potentially allocated timeslots */
+	for (tn = 0; tn < ARRAY_SIZE(sched->ts); tn++)
+		l1sched_del_ts(sched, tn);
+
+	/* Stop and reset clock counter if required */
+	if (reset_clock)
+		l1sched_clck_reset(sched);
+
+	memcpy(&sched->sacch_cache[0], &meas_rep_dummy[0], sizeof(meas_rep_dummy));
+}
+
+struct l1sched_ts *l1sched_add_ts(struct l1sched_state *sched, int tn)
+{
+	/* Make sure that ts isn't allocated yet */
+	if (sched->ts[tn] != NULL) {
+		LOGP_SCHEDC(sched, LOGL_ERROR, "Timeslot #%u already allocated\n", tn);
+		return NULL;
+	}
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE, "Add a new TDMA timeslot #%u\n", tn);
+
+	sched->ts[tn] = talloc_zero(sched, struct l1sched_ts);
+	sched->ts[tn]->sched = sched;
+	sched->ts[tn]->index = tn;
+
+	return sched->ts[tn];
+}
+
+void l1sched_del_ts(struct l1sched_state *sched, int tn)
+{
+	struct l1sched_lchan_state *lchan, *lchan_next;
+	struct l1sched_ts *ts;
+
+	/* Find ts in list */
+	ts = sched->ts[tn];
+	if (ts == NULL)
+		return;
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE, "Delete TDMA timeslot #%u\n", tn);
+
+	/* Deactivate all logical channels */
+	l1sched_deactivate_all_lchans(ts);
+
+	/* Free channel states */
+	llist_for_each_entry_safe(lchan, lchan_next, &ts->lchans, list) {
+		llist_del(&lchan->list);
+		talloc_free(lchan);
+	}
+
+	/* Flush queue primitives for TX */
+	l1sched_prim_flush_queue(&ts->tx_prims);
+
+	/* Remove ts from list and free memory */
+	sched->ts[tn] = NULL;
+	talloc_free(ts);
+
+	/* Notify transceiver about that */
+	l1sched_cfg_pchan_comb_req(sched, tn, GSM_PCHAN_NONE);
+}
+
+#define LAYOUT_HAS_LCHAN(layout, lchan) \
+	(layout->lchan_mask & ((uint64_t) 0x01 << lchan))
+
+int l1sched_configure_ts(struct l1sched_state *sched, int tn,
+			 enum gsm_phys_chan_config config)
+{
+	struct l1sched_lchan_state *lchan;
+	enum l1sched_lchan_type type;
+	struct l1sched_ts *ts;
+
+	/* Try to find specified ts */
+	ts = sched->ts[tn];
+	if (ts != NULL) {
+		/* Reconfiguration of existing one */
+		l1sched_reset_ts(sched, tn);
+	} else {
+		/* Allocate a new one if doesn't exist */
+		ts = l1sched_add_ts(sched, tn);
+		if (ts == NULL)
+			return -ENOMEM;
+	}
+
+	/* Choose proper multiframe layout */
+	ts->mf_layout = l1sched_mframe_layout(config, tn);
+	if (!ts->mf_layout)
+		return -EINVAL;
+	if (ts->mf_layout->chan_config != config)
+		return -EINVAL;
+
+	LOGP_SCHEDC(sched, LOGL_NOTICE,
+		    "(Re)configure TDMA timeslot #%u as %s\n",
+		    tn, ts->mf_layout->name);
+
+	/* Init queue primitives for TX */
+	INIT_LLIST_HEAD(&ts->tx_prims);
+	/* Init logical channels list */
+	INIT_LLIST_HEAD(&ts->lchans);
+
+	/* Allocate channel states */
+	for (type = 0; type < _L1SCHED_CHAN_MAX; type++) {
+		if (!LAYOUT_HAS_LCHAN(ts->mf_layout, type))
+			continue;
+
+		/* Allocate a channel state */
+		lchan = talloc_zero(ts, struct l1sched_lchan_state);
+		if (!lchan)
+			return -ENOMEM;
+
+		/* set backpointer */
+		lchan->ts = ts;
+
+		/* Set channel type */
+		lchan->type = type;
+
+		/* Add to the list of channel states */
+		llist_add_tail(&lchan->list, &ts->lchans);
+
+		/* Enable channel automatically if required */
+		if (l1sched_lchan_desc[type].flags & L1SCHED_CH_FLAG_AUTO)
+			l1sched_activate_lchan(ts, type);
+	}
+
+	/* Notify transceiver about TS activation */
+	l1sched_cfg_pchan_comb_req(sched, tn, config);
+
+	return 0;
+}
+
+int l1sched_reset_ts(struct l1sched_state *sched, int tn)
+{
+	struct l1sched_lchan_state *lchan, *lchan_next;
+	struct l1sched_ts *ts;
+
+	/* Try to find specified ts */
+	ts = sched->ts[tn];
+	if (ts == NULL)
+		return -EINVAL;
+
+	/* Undefine multiframe layout */
+	ts->mf_layout = NULL;
+
+	/* Flush queue primitives for TX */
+	l1sched_prim_flush_queue(&ts->tx_prims);
+
+	/* Deactivate all logical channels */
+	l1sched_deactivate_all_lchans(ts);
+
+	/* Free channel states */
+	llist_for_each_entry_safe(lchan, lchan_next, &ts->lchans, list) {
+		llist_del(&lchan->list);
+		talloc_free(lchan);
+	}
+
+	/* Notify transceiver about that */
+	l1sched_cfg_pchan_comb_req(sched, tn, GSM_PCHAN_NONE);
+
+	return 0;
+}
+
+int l1sched_start_ciphering(struct l1sched_ts *ts, uint8_t algo,
+			    const uint8_t *key, uint8_t key_len)
+{
+	struct l1sched_lchan_state *lchan;
+
+	/* Prevent NULL-pointer deference */
+	if (!ts)
+		return -EINVAL;
+
+	/* Make sure we can store this key */
+	if (key_len > MAX_A5_KEY_LEN)
+		return -ERANGE;
+
+	/* Iterate over all allocated logical channels */
+	llist_for_each_entry(lchan, &ts->lchans, list) {
+		/* Omit inactive channels */
+		if (!lchan->active)
+			continue;
+
+		/* Set key length and algorithm */
+		lchan->a5.key_len = key_len;
+		lchan->a5.algo = algo;
+
+		/* Copy requested key */
+		if (key_len)
+			memcpy(lchan->a5.key, key, key_len);
+	}
+
+	return 0;
+}
+
+struct l1sched_lchan_state *l1sched_find_lchan(struct l1sched_ts *ts,
+	enum l1sched_lchan_type chan)
+{
+	struct l1sched_lchan_state *lchan;
+
+	llist_for_each_entry(lchan, &ts->lchans, list)
+		if (lchan->type == chan)
+			return lchan;
+
+	return NULL;
+}
+
+int l1sched_set_lchans(struct l1sched_ts *ts, uint8_t chan_nr,
+		       int active, uint8_t tch_mode, uint8_t tsc)
+{
+	const struct l1sched_lchan_desc *lchan_desc;
+	struct l1sched_lchan_state *lchan;
+	int rc = 0;
+
+	/* Prevent NULL-pointer deference */
+	OSMO_ASSERT(ts != NULL);
+
+	/* Iterate over all allocated lchans */
+	llist_for_each_entry(lchan, &ts->lchans, list) {
+		lchan_desc = &l1sched_lchan_desc[lchan->type];
+
+		if (lchan_desc->chan_nr == (chan_nr & 0xf8)) {
+			if (active) {
+				rc |= l1sched_activate_lchan(ts, lchan->type);
+				lchan->tch_mode = tch_mode;
+				lchan->tsc = tsc;
+			} else
+				rc |= l1sched_deactivate_lchan(ts, lchan->type);
+		}
+	}
+
+	return rc;
+}
+
+int l1sched_activate_lchan(struct l1sched_ts *ts, enum l1sched_lchan_type chan)
+{
+	const struct l1sched_lchan_desc *lchan_desc = &l1sched_lchan_desc[chan];
+	struct l1sched_lchan_state *lchan;
+
+	/* Try to find requested logical channel */
+	lchan = l1sched_find_lchan(ts, chan);
+	if (lchan == NULL)
+		return -EINVAL;
+
+	if (lchan->active) {
+		LOGP_LCHANC(lchan, LOGL_ERROR, "is already activated\n");
+		return -EINVAL;
+	}
+
+	LOGP_LCHANC(lchan, LOGL_NOTICE, "activating\n");
+
+	/* Conditionally allocate memory for bursts */
+	if (lchan_desc->rx_fn && lchan_desc->burst_buf_size > 0) {
+		lchan->rx_bursts = talloc_zero_size(lchan,
+			lchan_desc->burst_buf_size);
+		if (lchan->rx_bursts == NULL)
+			return -ENOMEM;
+	}
+
+	if (lchan_desc->tx_fn && lchan_desc->burst_buf_size > 0) {
+		lchan->tx_bursts = talloc_zero_size(lchan,
+			lchan_desc->burst_buf_size);
+		if (lchan->tx_bursts == NULL)
+			return -ENOMEM;
+	}
+
+	/* Finally, update channel status */
+	lchan->active = 1;
+
+	return 0;
+}
+
+static void l1sched_reset_lchan(struct l1sched_lchan_state *lchan)
+{
+	/* Prevent NULL-pointer deference */
+	OSMO_ASSERT(lchan != NULL);
+
+	/* Print some TDMA statistics for Downlink */
+	if (l1sched_lchan_desc[lchan->type].rx_fn && lchan->active) {
+		LOGP_LCHANC(lchan, LOGL_DEBUG, "TDMA statistics: "
+			    "%lu DL frames have been processed, "
+			    "%lu lost (compensated), last fn=%u\n",
+			    lchan->tdma.num_proc,
+			    lchan->tdma.num_lost,
+			    lchan->tdma.last_proc);
+	}
+
+	/* Reset internal state variables */
+	lchan->rx_burst_mask = 0x00;
+	lchan->tx_burst_mask = 0x00;
+
+	/* Free burst memory */
+	talloc_free(lchan->rx_bursts);
+	talloc_free(lchan->tx_bursts);
+
+	lchan->rx_bursts = NULL;
+	lchan->tx_bursts = NULL;
+
+	/* Forget the current prim */
+	l1sched_prim_drop(lchan);
+
+	/* Channel specific stuff */
+	if (L1SCHED_CHAN_IS_TCH(lchan->type)) {
+		lchan->dl_ongoing_facch = 0;
+		lchan->ul_facch_blocks = 0;
+
+		lchan->tch_mode = GSM48_CMODE_SIGN;
+
+		/* Reset AMR state */
+		memset(&lchan->amr, 0x00, sizeof(lchan->amr));
+	} else if (L1SCHED_CHAN_IS_SACCH(lchan->type)) {
+		/* Reset SACCH state */
+		memset(&lchan->sacch, 0x00, sizeof(lchan->sacch));
+	}
+
+	/* Reset ciphering state */
+	memset(&lchan->a5, 0x00, sizeof(lchan->a5));
+
+	/* Reset TDMA frame statistics */
+	memset(&lchan->tdma, 0x00, sizeof(lchan->tdma));
+}
+
+int l1sched_deactivate_lchan(struct l1sched_ts *ts, enum l1sched_lchan_type chan)
+{
+	struct l1sched_lchan_state *lchan;
+
+	/* Try to find requested logical channel */
+	lchan = l1sched_find_lchan(ts, chan);
+	if (lchan == NULL)
+		return -EINVAL;
+
+	if (!lchan->active) {
+		LOGP_LCHANC(lchan, LOGL_ERROR, "is already deactivated\n");
+		return -EINVAL;
+	}
+
+	LOGP_LCHANC(lchan, LOGL_DEBUG, "deactivating\n");
+
+	/* Reset internal state, free memory */
+	l1sched_reset_lchan(lchan);
+
+	/* Update activation flag */
+	lchan->active = 0;
+
+	return 0;
+}
+
+void l1sched_deactivate_all_lchans(struct l1sched_ts *ts)
+{
+	struct l1sched_lchan_state *lchan;
+
+	LOGP_SCHEDC(ts->sched, LOGL_DEBUG,
+		    "Deactivating all logical channels on ts=%d\n",
+		    ts->index);
+
+	llist_for_each_entry(lchan, &ts->lchans, list) {
+		/* Omit inactive channels */
+		if (!lchan->active)
+			continue;
+
+		/* Reset internal state, free memory */
+		l1sched_reset_lchan(lchan);
+
+		/* Update activation flag */
+		lchan->active = 0;
+	}
+}
+
+enum gsm_phys_chan_config l1sched_chan_nr2pchan_config(uint8_t chan_nr)
+{
+	uint8_t cbits = chan_nr >> 3;
+
+	if (cbits == ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs)
+		return GSM_PCHAN_TCH_F;
+	else if ((cbits & 0x1e) == ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(0))
+		return GSM_PCHAN_TCH_H;
+	else if ((cbits & 0x1c) == ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(0))
+		return GSM_PCHAN_CCCH_SDCCH4;
+	else if ((cbits & 0x18) == ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(0))
+		return GSM_PCHAN_SDCCH8_SACCH8C;
+	else if ((cbits & 0x1f) == ABIS_RSL_CHAN_NR_CBITS_OSMO_CBCH4)
+		return GSM_PCHAN_CCCH_SDCCH4_CBCH;
+	else if ((cbits & 0x1f) == ABIS_RSL_CHAN_NR_CBITS_OSMO_CBCH8)
+		return GSM_PCHAN_SDCCH8_SACCH8C_CBCH;
+	else if ((cbits & 0x1f) == ABIS_RSL_CHAN_NR_CBITS_OSMO_PDCH)
+		return GSM_PCHAN_PDCH;
+
+	return GSM_PCHAN_NONE;
+}
+
+enum l1sched_lchan_type l1sched_chan_nr2lchan_type(uint8_t chan_nr,
+	uint8_t link_id)
+{
+	int i;
+
+	/* Iterate over all known lchan types */
+	for (i = 0; i < _L1SCHED_CHAN_MAX; i++)
+		if (l1sched_lchan_desc[i].chan_nr == (chan_nr & 0xf8))
+			if (l1sched_lchan_desc[i].link_id == link_id)
+				return i;
+
+	return L1SCHED_IDLE;
+}
+
+static void l1sched_a5_burst_dec(struct l1sched_lchan_state *lchan,
+	uint32_t fn, sbit_t *burst)
+{
+	ubit_t ks[114];
+	int i;
+
+	/* Generate keystream for a DL burst */
+	osmo_a5(lchan->a5.algo, lchan->a5.key, fn, ks, NULL);
+
+	/* Apply keystream over ciphertext */
+	for (i = 0; i < 57; i++) {
+		if (ks[i])
+			burst[i + 3] *= -1;
+		if (ks[i + 57])
+			burst[i + 88] *= -1;
+	}
+}
+
+static void l1sched_a5_burst_enc(struct l1sched_lchan_state *lchan,
+				 struct l1sched_burst_req *br)
+{
+	ubit_t ks[114];
+	int i;
+
+	/* Generate keystream for an UL burst */
+	osmo_a5(lchan->a5.algo, lchan->a5.key, br->fn, NULL, ks);
+
+	/* Apply keystream over plaintext */
+	for (i = 0; i < 57; i++) {
+		br->burst[i + 3] ^= ks[i];
+		br->burst[i + 88] ^= ks[i + 57];
+	}
+}
+
+static int subst_frame_loss(struct l1sched_lchan_state *lchan,
+			    l1sched_lchan_rx_func *handler,
+			    uint32_t fn)
+{
+	const struct l1sched_tdma_multiframe *mf;
+	const struct l1sched_tdma_frame *fp;
+	int elapsed, i;
+
+	/* Wait until at least one TDMA frame is processed */
+	if (lchan->tdma.num_proc == 0)
+		return -EAGAIN;
+
+	/* Short alias for the current multiframe */
+	mf = lchan->ts->mf_layout;
+
+	/* Calculate how many frames elapsed since the last received one.
+	 * The algorithm is based on GSM::FNDelta() from osmo-trx. */
+	elapsed = fn - lchan->tdma.last_proc;
+	if (elapsed >= GSM_TDMA_HYPERFRAME / 2)
+		elapsed -= GSM_TDMA_HYPERFRAME;
+	else if (elapsed < -GSM_TDMA_HYPERFRAME / 2)
+		elapsed += GSM_TDMA_HYPERFRAME;
+
+	/* Check TDMA frame order (wrong order is possible with fake_trx.py, see OS#4658) */
+	if (elapsed < 0) {
+		/* This burst has already been substituted by a dummy burst (all bits set to zero),
+		 * so better drop it. Otherwise we risk to get undefined behavior in handler(). */
+		LOGP_LCHAND(lchan, LOGL_ERROR, "Rx burst with fn=%u older than the last "
+			    "processed fn=%u (see OS#4658) => dropping\n",
+			    fn, lchan->tdma.last_proc);
+		return -EALREADY;
+	}
+
+	/* Check how many frames we (potentially) need to compensate */
+	if (elapsed > mf->period) {
+		LOGP_LCHANC(lchan, LOGL_NOTICE,
+			    "Too many (>%u) contiguous TDMA frames elapsed (%d) "
+			    "since the last processed fn=%u (current %u)\n",
+			    mf->period, elapsed, lchan->tdma.last_proc, fn);
+		return -EIO;
+	} else if (elapsed == 0) {
+		LOGP_LCHANC(lchan, LOGL_ERROR,
+			    "No TDMA frames elapsed since the last processed "
+			    "fn=%u, must be a bug?\n", lchan->tdma.last_proc);
+		return -EIO;
+	}
+
+	static const sbit_t bits[148] = { 0 };
+	struct l1sched_meas_set fake_meas = {
+		.fn = lchan->tdma.last_proc,
+		.rssi = -120,
+		.toa256 = 0,
+	};
+
+	/* Traverse from fp till the current frame */
+	for (i = 0; i < elapsed - 1; i++) {
+		fp = &mf->frames[GSM_TDMA_FN_INC(fake_meas.fn) % mf->period];
+		if (fp->dl_chan != lchan->type)
+			continue;
+
+		LOGP_LCHANC(lchan, LOGL_NOTICE,
+			    "Substituting lost TDMA frame fn=%u\n",
+			    fake_meas.fn);
+
+		handler(lchan, fake_meas.fn, fp->dl_bid, bits, &fake_meas);
+
+		/* Update TDMA frame statistics */
+		lchan->tdma.last_proc = fake_meas.fn;
+		lchan->tdma.num_proc++;
+		lchan->tdma.num_lost++;
+	}
+
+	return 0;
+}
+
+int l1sched_handle_rx_burst(struct l1sched_state *sched, uint8_t tn,
+	uint32_t fn, sbit_t *bits, uint16_t nbits,
+	const struct l1sched_meas_set *meas)
+{
+	struct l1sched_lchan_state *lchan;
+	const struct l1sched_tdma_frame *frame;
+	struct l1sched_ts *ts;
+
+	l1sched_lchan_rx_func *handler;
+	enum l1sched_lchan_type chan;
+	uint8_t offset, bid;
+	int rc;
+
+	/* Check whether required timeslot is allocated and configured */
+	ts = sched->ts[tn];
+	if (ts == NULL || ts->mf_layout == NULL) {
+		LOGP_SCHEDD(sched, LOGL_DEBUG,
+			    "Timeslot #%u isn't configured, ignoring burst...\n", tn);
+		return -EINVAL;
+	}
+
+	/* Get frame from multiframe */
+	offset = fn % ts->mf_layout->period;
+	frame = ts->mf_layout->frames + offset;
+
+	/* Get required info from frame */
+	bid = frame->dl_bid;
+	chan = frame->dl_chan;
+	handler = l1sched_lchan_desc[chan].rx_fn;
+
+	/* Omit bursts which have no handler, like IDLE bursts.
+	 * TODO: handle noise indications during IDLE frames. */
+	if (!handler)
+		return -ENODEV;
+
+	/* Find required channel state */
+	lchan = l1sched_find_lchan(ts, chan);
+	if (lchan == NULL)
+		return -ENODEV;
+
+	/* Ensure that channel is active */
+	if (!lchan->active)
+		return 0;
+
+	/* Compensate lost TDMA frames (if any) */
+	rc = subst_frame_loss(lchan, handler, fn);
+	if (rc == -EALREADY)
+		return rc;
+
+	/* Perform A5/X decryption if required */
+	if (lchan->a5.algo)
+		l1sched_a5_burst_dec(lchan, fn, bits);
+
+	/* Put burst to handler */
+	handler(lchan, fn, bid, bits, meas);
+
+	/* Update TDMA frame statistics */
+	lchan->tdma.last_proc = fn;
+
+	if (++lchan->tdma.num_proc == 0) {
+		/* Theoretically, we may have an integer overflow of num_proc counter.
+		 * As a consequence, subst_frame_loss() will be unable to compensate
+		 * one (potentionally lost) Downlink burst. On practice, it would
+		 * happen once in 4615 * 10e-6 * (2 ^ 32 - 1) seconds or ~6 years. */
+		LOGP_LCHAND(lchan, LOGL_NOTICE,
+			    "Too many TDMA frames have been processed. "
+			    "Are you running trxcon for more than 6 years?!?\n");
+		lchan->tdma.num_proc = 1;
+	}
+
+	return 0;
+}
+
+#define MEAS_HIST_FIRST(hist) \
+	(&hist->buf[0])
+#define MEAS_HIST_LAST(hist) \
+	(MEAS_HIST_FIRST(hist) + ARRAY_SIZE(hist->buf) - 1)
+
+/* Add a new set of measurements to the history */
+void l1sched_lchan_meas_push(struct l1sched_lchan_state *lchan, const struct l1sched_meas_set *meas)
+{
+	struct l1sched_lchan_meas_hist *hist = &lchan->meas_hist;
+
+	/* Find a new position where to store the measurements */
+	if (hist->head == MEAS_HIST_LAST(hist) || hist->head == NULL)
+		hist->head = MEAS_HIST_FIRST(hist);
+	else
+		hist->head++;
+
+	*hist->head = *meas;
+}
+
+/* Calculate the AVG of n measurements from the history */
+void l1sched_lchan_meas_avg(struct l1sched_lchan_state *lchan, unsigned int n)
+{
+	struct l1sched_lchan_meas_hist *hist = &lchan->meas_hist;
+	struct l1sched_meas_set *meas = hist->head;
+	int toa256_sum = 0;
+	int rssi_sum = 0;
+	int i;
+
+	OSMO_ASSERT(n > 0 && n <= ARRAY_SIZE(hist->buf));
+	OSMO_ASSERT(meas != NULL);
+
+	/* Traverse backwards up to n entries, calculate the sum */
+	for (i = 0; i < n; i++) {
+		toa256_sum += meas->toa256;
+		rssi_sum += meas->rssi;
+
+		/* Do not go below the first burst */
+		if (i + 1 == n)
+			break;
+
+		if (meas == MEAS_HIST_FIRST(hist))
+			meas = MEAS_HIST_LAST(hist);
+		else
+			meas--;
+	}
+
+	/* Calculate the AVG */
+	lchan->meas_avg.toa256 = toa256_sum / n;
+	lchan->meas_avg.rssi = rssi_sum / n;
+
+	/* As a bonus, store TDMA frame number of the first burst */
+	lchan->meas_avg.fn = meas->fn;
+}