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The commented out test code is not maintained and behaviour is
unknown. Remove for clarity.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The configuration table is instantiated as a global variable with
no means to check constructor status. This means various types
of database failure conditions (e.g. file existence, permissions,
etc.) are not reported. This patch performs a small number of
checks to make sure that the configuration is sane.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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There is no temporal dependency on when the RACH sequence is generated,
so there is no need for transceiver to create it in response to a
command from GSM core. If we power on the transceiver, we will need
the RACH sequence, so just allocate it during initialization.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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The original split-transceiver abstraction did not maintain
internal instances of the radio interface or drive loop.
The FIFO's were attached through external calls. The control
loop, however, made such an approach overly difficult, so
the transceiver now maintains pointers to the aforementioned
objects. In doing so, we no longer need external attachment
calls to setup the FIFO's.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
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Previous approach was to allow stack unwinding to take care
shutdown and thread ending, which was unpredictable and
occasionally segfault. Attempt to shutdown more gracefully.
There are thread cancellation points in the transceiver code
using pthread_testcancel(), but the thread abstraction library
does not allow direct access to the pthread variables. This
prevents thread shutdown through pthread_cancel(). To get
around this, use boolean status values in the receive socket
service loops and main drive loop.
The socket read calls will block indefinitly, so shutdown
may cause the socket implementation to throw a SocketError
exception. Use of timeout values with reads does not seem to
work correctly or reliably, so catch the exception and ignore
if it occurs on shutdown.
The following error may appear as the socket is shutdown while
the Transceiver is blocking on read().
DatagramSocket::read() failed: Bad file descriptor
So be it; the API doesn't allow us to do any more.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
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Add a transceiver main() for multi-arfcn use and modify single
channel transceiver for use with updated interfaces.
Setup multiTRX with 3 channels for default case.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
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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.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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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>
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The transceiver only uses a single integer oversampling value,
which is more simply referred to as samples-per-symbol.
mRadioOversampling --> mSPS
mTransceiverOversampling (removed)
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Previously, two timing correction values were used for UHD devices
depending on the sample rate of 270.833e3 or 400e3 for native GSM or
resampled device rate respectively. The correction values compensate
for residual timing effects due to analog component delays, filters
lag times, and general fudge factors. These values are device
specific and over-generalized by the two value configuration.
This patch adds the following struct to store these correction
values by device type and sample rate - through samples-per-symbol.
struct uhd_dev_offset {
enum uhd_dev_type type;
int sps;
double offset;
};
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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Set optional transmit and receive antennas from database configuration
file. Use default antenna values on empty string or if option does not
exist.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
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instead of hardcoding them.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@4634 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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Without this patch, if SAMPSPERSYM is set bigger than 1, then
erratic behaviour will occur.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@4633 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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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
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Device errors regarding properties such as sample
rate or frequency tuning are almost always fatal and
lead to the common error "assuming TRX is dead".
Make sure that these errors are clearly presented to
the user.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2700 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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For network based devices (USRP2, N200, etc.), increase the
latency from 2 to 3 frames, which effectively buffers more
samples on the host in front of the Ethernet interface.
USB devices (USRP1 and B100) utilize an adaptive mechanism
so they are less effected by this value.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2685 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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The low-level RadioDevice interface is agnostic to libusrp
or uhd based devices. 'make' allocates and returns a
pointer to a generic RadioDevice implemented for whatever
class of device determined at compile time.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2684 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2307 19bc5d8c-e614-43d4-8b26-e1612bc8e597
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