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USRP driver improvements.

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Set bit size to be 16 for interpolators and decimators.
Match buffer size to UHD.
Don't destroy TX stream, as there appears to be a bug when recreating it.
Catch exception when checking for TX underflow.
Increase RX FIFO size, to reduce overflows at high sample rates.
Allow RX to continue streaming after receiving timeout.
This commit is contained in:
Jon Beniston
2020-10-23 13:12:37 +01:00
parent 8b05670814
commit 209be94947
9 changed files with 115 additions and 59 deletions
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plugins/samplesource/usrpinput/usrpinputthread.cpp
+46 -21
View File
@@ -26,20 +26,35 @@
#include "usrpinputsettings.h"
#include "usrpinputthread.h"
USRPInputThread::USRPInputThread(uhd::rx_streamer::sptr stream, SampleSinkFifo* sampleFifo, QObject* parent) :
USRPInputThread::USRPInputThread(uhd::rx_streamer::sptr stream, size_t bufSamples, SampleSinkFifo* sampleFifo, QObject* parent) :
QThread(parent),
m_running(false),
m_stream(stream),
m_convertBuffer(DeviceUSRP::blockSize),
m_bufSamples(bufSamples),
m_convertBuffer(bufSamples),
m_sampleFifo(sampleFifo),
m_log2Decim(0)
{
std::fill(m_buf, m_buf + 2*DeviceUSRP::blockSize, 0);
// *2 as samples are I+Q
m_buf = new qint16[2*bufSamples];
std::fill(m_buf, m_buf + 2*bufSamples, 0);
}
USRPInputThread::~USRPInputThread()
{
stopWork();
delete m_buf;
}
void USRPInputThread::issueStreamCmd(bool start)
{
uhd::stream_cmd_t stream_cmd(start ? uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS : uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
stream_cmd.num_samps = size_t(0);
stream_cmd.stream_now = true;
stream_cmd.time_spec = uhd::time_spec_t();
m_stream->issue_stream_cmd(stream_cmd);
qDebug() << "USRPInputThread::issueStreamCmd " << (start ? "start" : "stop");
}
void USRPInputThread::startWork()
@@ -48,12 +63,8 @@ void USRPInputThread::startWork()
try
{
uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
stream_cmd.num_samps = size_t(0);
stream_cmd.stream_now = true;
stream_cmd.time_spec = uhd::time_spec_t();
m_stream->issue_stream_cmd(stream_cmd);
// Start streaming
issueStreamCmd(true);
// Reset stats
m_packets = 0;
@@ -84,18 +95,20 @@ void USRPInputThread::stopWork()
try
{
uhd::rx_metadata_t md;
uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
stream_cmd.stream_now = true;
m_stream->issue_stream_cmd(stream_cmd);
// Stop streaming
issueStreamCmd(false);
// Clear out any data left in the stream, otherwise we'll get an
// exception 'recv buffer smaller than vrt packet offset' when restarting
while (!md.end_of_burst)
md.end_of_burst = false;
md.error_code = uhd::rx_metadata_t::ERROR_CODE_NONE;
while (!md.end_of_burst && (md.error_code != uhd::rx_metadata_t::ERROR_CODE_TIMEOUT))
{
try
{
//qDebug() << "USRPInputThread::stopWork: recing until end of burst";
m_stream->recv(m_buf, DeviceUSRP::blockSize, md);
md.reset();
m_stream->recv(m_buf, m_bufSamples, md);
}
catch (std::exception& e)
{
@@ -127,27 +140,39 @@ void USRPInputThread::run()
{
while (m_running)
{
const size_t samples_received = m_stream->recv(m_buf, DeviceUSRP::blockSize, md);
md.reset();
const size_t samples_received = m_stream->recv(m_buf, m_bufSamples, md);
m_packets++;
if (samples_received != DeviceUSRP::blockSize)
if (samples_received != m_bufSamples)
{
qDebug("USRPInputThread::run - received %ld/%d samples", samples_received, DeviceUSRP::blockSize);
qDebug("USRPInputThread::run - received %ld/%d samples", samples_received, m_bufSamples);
}
if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT)
{
qDebug("USRPInputThread::run - timeout - ending thread");
m_timeouts++;
// It seems we can't recover after a timeout, so stop thread
m_running = false;
// Restart streaming
issueStreamCmd(false);
issueStreamCmd(true);
qDebug("USRPInputThread::run - timeout - restarting");
}
else if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_OVERFLOW)
{
qDebug("USRPInputThread::run - overflow");
m_overflows++;
}
else if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_LATE_COMMAND)
qDebug("USRPInputThread::run - late command error");
else if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_BROKEN_CHAIN)
qDebug("USRPInputThread::run - broken chain error");
else if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_ALIGNMENT)
qDebug("USRPInputThread::run - alignment error");
else if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_BAD_PACKET)
qDebug("USRPInputThread::run - bad packet error");
callbackIQ(m_buf, 2 * samples_received);
if (samples_received > 0)
callbackIQ(m_buf, 2 * samples_received);
}
}
catch (std::exception& e)