Before UHD version 3.9.0 on-board GPSDO modules for USRP
devices were automatically enabled if detected. After UHD
version 3.9.0 the UHD behavior changed to require explicit
setting of the reference to enable GPSDO use.
Modify the interfaces to pass 'internal', 'external' and
'gpsdo' reference options from configuration database into
the UHD driver layer. Convert the 'TRX.reference' entry in
the configuration from a boolean value to string.
Enabling the external reference on UHD devices through the configure
time switch is awkward. Use a database variable "TRX.Reference" with
'0' or '1' value for internal and external references respectively.
Use internal reference is no entry is defined.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6754 19bc5d8c-e614-43d4-8b26-e1612bc8e597
Current functionality with these old versions is questionable.
There is no reason to use any version of GNU Radio / libusrp older
than 3.3. Version 3.4.2 is the only recommended version for USRP1
users.
Non-USRP1 users must use UHD driver from Ettus Research.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6749 19bc5d8c-e614-43d4-8b26-e1612bc8e597
This patch applies oversampling, when selected with 4 sps,
to the downlink only, while running the receiver with
minimal sampling at 1 sps. These split sample rates allow
us to run a highly accurate downlink signal with minimal
distortion, while keeping receive path channel filtering
on the FPGA.
Without this patch, we oversample the receive path and
require a steep receive filter to get similar adjacent
channel suppression as the FPGA halfband / CIC filter
combination, which comes with a high computational cost.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6747 19bc5d8c-e614-43d4-8b26-e1612bc8e597
Remove the built time resampling selection and link both options.
Move the normal push/pullBuffer() calls back to the base class and
overload them in the inherited resampling class.
USRP2/N2xx devices are the only devices that require resampling so
return that resampling is necessary on the device open(), which is
the point at which the device type will be known.
The GSM transceiver only operates at a whole number multiple of
the GSM rate and doesn't care about the actual device rate and
if resampling is used. Therefore GSM specific portion of the
transceiver should only need to submit the samples-per-symbol
value to the device interface.
Then, the device should be able to determine the appropriate
sample rate (400 ksps or 270.833 ksps) and if resampling is
appropriate.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6723 19bc5d8c-e614-43d4-8b26-e1612bc8e597
UHD device type was previously detected, but only categorized in
terms of bus type, USB or Ethernet, and sample rate capability.
With the number of supported device increasing, we can no longer
easily group devices since we need to handle more and more
device-specific peculiarities. Some of these factors are managed
internally by the UHD driver, but other factors (e.g. timing
offsets) are specific to a single device.
Start by maintaining an enumerated list of relevant device types
that we can use for applying device specific operations. Also
rename the USB/Ethernet grouping to transmit window type because
that's what it is.
enum uhd_dev_type {
USRP1,
USRP2,
B100,
NUM_USRP_TYPES,
};
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6719 19bc5d8c-e614-43d4-8b26-e1612bc8e597
UHD accepts optional 'args' that can be used for device descriptions
such as IP address, device type, etc. Allow these to be passed in on
the transceiver command line as the third argument (number of supported
carriers is the second argument). This option benefits those who may
have multiple UHD devices attached to a single system.
This option is not yet supported by GSM core and requires starting the
transceiver independently on the command line. This option has no
effect when USRP1 is used.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@4315 19bc5d8c-e614-43d4-8b26-e1612bc8e597
With the introduction of the B100, there is USB support
using UHD devices. The characteristics of the trasmit
side burst submissions are more reflective of the bus
type than the device or driver.
Use a fixed latency interval for network devices and the
adaptive underrun approach for USB devices - regardless
of driver or device type.
The GPMC based transport on the E100 appears unaffected
by either latency scheme, which defaults to network.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2677 19bc5d8c-e614-43d4-8b26-e1612bc8e597
Remove all RFX specific parts and control daughterboard
functionality using the base API. The tuning is now set
to a non-inverted image so remove the I/Q swap as well.
Daughterboard configuration is set through an enum
variable. Currently, there is no auto-configuration and
the default is Tx/RX on sides A/B respectively. For
transceiver boards the receive antenna is set to RX2.
enum dboardConfigType {
TXA_RXB,
TXB_RXA,
TXA_RXA,
TXB_RXB
};
const dboardConfigType dboardConfig = TXA_RXB;
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2632 19bc5d8c-e614-43d4-8b26-e1612bc8e597
