host: Fix umtrx_cal_tx_dc_offset help output to mention UmTRX.

host/utils/umtrx_cal_tx_dc_offset.cpp

@@ -371,9 +371,9 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
 
     //print the help message
     if (vm.count("help")){
-        std::cout << boost::format("USRP Generate TX DC Offset Calibration Table %s") % desc << std::endl;
+        std::cout << boost::format("UmTRX Generate TX DC Offset Calibration Table %s") % desc << std::endl;
         std::cout <<
-            "This application measures leakage between RX and TX on an XCVR daughterboard to self-calibrate.\n"
+            "This application measures leakage between RX and TX using LMS6002D internal RF loopback to self-calibrate.\n"
             << std::endl;
         return ~0;
     }

host/utils/umtrx_cal_tx_iq_balance.cpp

@@ -0,0 +1,232 @@
+//
+// Copyright 2010,2012 Ettus Research LLC
+//
+// 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 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 General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "usrp_cal_utils.hpp"
+#include <uhd/utils/thread_priority.hpp>
+#include <uhd/utils/safe_main.hpp>
+#include <boost/program_options.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/math/special_functions/round.hpp>
+#include <iostream>
+#include <complex>
+#include <ctime>
+#include <cstdlib>
+
+namespace po = boost::program_options;
+
+/***********************************************************************
+ * Transmit thread
+ **********************************************************************/
+static void tx_thread(uhd::usrp::multi_usrp::sptr usrp, const double tx_wave_freq, const double tx_wave_ampl){
+    uhd::set_thread_priority_safe();
+
+    //create a transmit streamer
+    uhd::stream_args_t stream_args("fc32"); //complex floats
+    uhd::tx_streamer::sptr tx_stream = usrp->get_tx_stream(stream_args);
+
+    //setup variables and allocate buffer
+    uhd::tx_metadata_t md;
+    md.has_time_spec = false;
+    std::vector<samp_type> buff(tx_stream->get_max_num_samps()*10);
+
+    //values for the wave table lookup
+    size_t index = 0;
+    const double tx_rate = usrp->get_tx_rate();
+    const size_t step = boost::math::iround(wave_table_len * tx_wave_freq/tx_rate);
+    wave_table table(tx_wave_ampl);
+
+    //fill buff and send until interrupted
+    while (not boost::this_thread::interruption_requested()){
+        for (size_t i = 0; i < buff.size(); i++){
+            buff[i] = table(index += step);
+        }
+        tx_stream->send(&buff.front(), buff.size(), md);
+    }
+
+    //send a mini EOB packet
+    md.end_of_burst = true;
+    tx_stream->send("", 0, md);
+}
+
+/***********************************************************************
+ * Tune RX and TX routine
+ **********************************************************************/
+static double tune_rx_and_tx(uhd::usrp::multi_usrp::sptr usrp, const double tx_lo_freq, const double rx_offset){
+    //tune the transmitter with no cordic
+    uhd::tune_request_t tx_tune_req(tx_lo_freq);
+    tx_tune_req.dsp_freq_policy = uhd::tune_request_t::POLICY_MANUAL;
+    tx_tune_req.dsp_freq = 0;
+    usrp->set_tx_freq(tx_tune_req);
+
+    //tune the receiver
+    usrp->set_rx_freq(usrp->get_tx_freq() - rx_offset);
+
+    //wait for the LOs to become locked
+    boost::this_thread::sleep(boost::posix_time::milliseconds(50));
+    boost::system_time start = boost::get_system_time();
+    while (not usrp->get_tx_sensor("lo_locked").to_bool() or not usrp->get_rx_sensor("lo_locked").to_bool()){
+        if (boost::get_system_time() > start + boost::posix_time::milliseconds(100)){
+            throw std::runtime_error("timed out waiting for TX and/or RX LO to lock");
+        }
+    }
+
+    return usrp->get_tx_freq();
+}
+
+/***********************************************************************
+ * Main
+ **********************************************************************/
+int UHD_SAFE_MAIN(int argc, char *argv[]){
+    std::string args, subdev, serial;
+    double tx_wave_freq, tx_wave_ampl, rx_offset;
+    double freq_start, freq_stop, freq_step;
+    size_t nsamps;
+
+    po::options_description desc("Allowed options");
+    desc.add_options()
+        ("help", "help message")
+        ("verbose", "enable some verbose")
+        ("args", po::value<std::string>(&args)->default_value(""), "device address args [default = \"\"]")
+        ("subdev", po::value<std::string>(&subdev), "Subdevice specification (default: first subdevice, often 'A')")
+        ("tx_wave_freq", po::value<double>(&tx_wave_freq)->default_value(507.123e3), "Transmit wave frequency in Hz")
+        ("tx_wave_ampl", po::value<double>(&tx_wave_ampl)->default_value(0.7), "Transmit wave amplitude in counts")
+        ("rx_offset", po::value<double>(&rx_offset)->default_value(.9344e6), "RX LO offset from the TX LO in Hz")
+        ("freq_start", po::value<double>(&freq_start), "Frequency start in Hz (do not specify for default)")
+        ("freq_stop", po::value<double>(&freq_stop), "Frequency stop in Hz (do not specify for default)")
+        ("freq_step", po::value<double>(&freq_step)->default_value(default_freq_step), "Step size for LO sweep in Hz")
+        ("nsamps", po::value<size_t>(&nsamps)->default_value(default_num_samps), "Samples per data capture")
+    ;
+
+    po::variables_map vm;
+    po::store(po::parse_command_line(argc, argv, desc), vm);
+    po::notify(vm);
+
+    //print the help message
+    if (vm.count("help")){
+        std::cout << boost::format("USRP Generate TX IQ Balance Calibration Table %s") % desc << std::endl;
+        std::cout <<
+            "This application measures leakage between RX and TX on a transceiver daughterboard to self-calibrate.\n"
+            "Note: Not all daughterboards support this feature. Refer to the UHD manual for details.\n"
+            << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    // Create a USRP device
+    uhd::usrp::multi_usrp::sptr usrp = setup_usrp_for_cal(args, subdev, serial);
+
+    //create a receive streamer
+    uhd::stream_args_t stream_args("fc32"); //complex floats
+    uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args);
+
+    //create a transmitter thread
+    boost::thread_group threads;
+    threads.create_thread(boost::bind(&tx_thread, usrp, tx_wave_freq, tx_wave_ampl));
+
+    //re-usable buffer for samples
+    std::vector<samp_type> buff;
+
+    //store the results here
+    std::vector<result_t> results;
+
+    if (not vm.count("freq_start")) freq_start = usrp->get_tx_freq_range().start() + 50e6;
+    if (not vm.count("freq_stop")) freq_stop = usrp->get_tx_freq_range().stop() - 50e6;
+    UHD_MSG(status) << boost::format("Calibration frequency range: %d MHz -> %d MHz") % (freq_start/1e6) % (freq_stop/1e6) << std::endl;
+
+    for (double tx_lo_i = freq_start; tx_lo_i <= freq_stop; tx_lo_i += freq_step){
+        const double tx_lo = tune_rx_and_tx(usrp, tx_lo_i, rx_offset);
+
+        //frequency constants for this tune event
+        const double actual_rx_rate = usrp->get_rx_rate();
+        const double actual_tx_freq = usrp->get_tx_freq();
+        const double actual_rx_freq = usrp->get_rx_freq();
+        const double bb_tone_freq = actual_tx_freq + tx_wave_freq - actual_rx_freq;
+        const double bb_imag_freq = actual_tx_freq - tx_wave_freq - actual_rx_freq;
+
+        //capture initial uncorrected value
+        usrp->set_tx_iq_balance(0.0);
+        capture_samples(usrp, rx_stream, buff, nsamps);
+        const double initial_suppression = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate) - compute_tone_dbrms(buff, bb_imag_freq/actual_rx_rate);
+
+        //bounds and results from searching
+        std::complex<double> best_correction;
+        double phase_corr_start = -.3, phase_corr_stop = .3, phase_corr_step;
+        double ampl_corr_start = -.3, ampl_corr_stop = .3, ampl_corr_step;
+        double best_suppression = 0, best_phase_corr = 0, best_ampl_corr = 0;
+
+        for (size_t i = 0; i < num_search_iters; i++){
+
+            phase_corr_step = (phase_corr_stop - phase_corr_start)/(num_search_steps-1);
+            ampl_corr_step = (ampl_corr_stop - ampl_corr_start)/(num_search_steps-1);
+
+            for (double phase_corr = phase_corr_start; phase_corr <= phase_corr_stop + phase_corr_step/2; phase_corr += phase_corr_step){
+            for (double ampl_corr = ampl_corr_start; ampl_corr <= ampl_corr_stop + ampl_corr_step/2; ampl_corr += ampl_corr_step){
+
+                const std::complex<double> correction(ampl_corr, phase_corr);
+                usrp->set_tx_iq_balance(correction);
+
+                //receive some samples
+                capture_samples(usrp, rx_stream, buff, nsamps);
+
+                const double tone_dbrms = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate);
+                const double imag_dbrms = compute_tone_dbrms(buff, bb_imag_freq/actual_rx_rate);
+                const double suppression = tone_dbrms - imag_dbrms;
+
+                if (suppression > best_suppression){
+                    best_correction = correction;
+                    best_suppression = suppression;
+                    best_phase_corr = phase_corr;
+                    best_ampl_corr = ampl_corr;
+                }
+
+            }}
+
+            //std::cout << "best_phase_corr " << best_phase_corr << std::endl;
+            //std::cout << "best_ampl_corr " << best_ampl_corr << std::endl;
+            //std::cout << "best_suppression " << best_suppression << std::endl;
+
+            phase_corr_start = best_phase_corr - phase_corr_step;
+            phase_corr_stop = best_phase_corr + phase_corr_step;
+            ampl_corr_start = best_ampl_corr - ampl_corr_step;
+            ampl_corr_stop = best_ampl_corr + ampl_corr_step;
+        }
+
+        if (best_suppression > 30){ //most likely valid, keep result
+            result_t result;
+            result.freq = tx_lo;
+            result.real_corr = best_correction.real();
+            result.imag_corr = best_correction.imag();
+            result.best = best_suppression;
+            result.delta = best_suppression - initial_suppression;
+            results.push_back(result);
+            if (vm.count("verbose")){
+                std::cout << boost::format("TX IQ: %f MHz: best suppression %f dB, corrected %f dB") % (tx_lo/1e6) % result.best % result.delta << std::endl;
+            }
+            else std::cout << "." << std::flush;
+        }
+
+    }
+    std::cout << std::endl;
+
+    //stop the transmitter
+    threads.interrupt_all();
+    threads.join_all();
+
+    store_results(results, "TX", "tx", "iq", serial);
+
+    return EXIT_SUCCESS;
+}
+