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Merge pull request #605 from ubfx/plutosdr_iq_sampling

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Fix libiio channel handling for IQ sampling with plutosdr
This commit is contained in:
f4exb
2020-08-19 13:13:45 +02:00
committed by GitHub
parent 596d2ef149 c4ccb59e95
commit 0c04560b3c
3 changed files with 46 additions and 43 deletions
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plugins/samplesource/plutosdrinput/plutosdrinputthread.cpp
+7 -31
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@@ -80,7 +80,7 @@ void PlutoSDRInputThread::run()
qDebug("PlutoSDRInputThread::run: rxBufferStep: %ld bytes", p_inc);
qDebug("PlutoSDRInputThread::run: Rx sample size is %ld bytes", m_plutoBox->getRxSampleSize());
qDebug("PlutoSDRInputThread::run: Tx sample size is %ld bytes", m_plutoBox->getTxSampleSize());
qDebug("PlutoSDRInputThread::run: nominal nbytes_rx is %d bytes with 2 refills", m_blockSizeSamples*2);
qDebug("PlutoSDRInputThread::run: nominal nbytes_rx is %d bytes with 1 refill", m_blockSizeSamples*4);
m_running = true;
m_startWaiter.wakeAll();
@@ -94,9 +94,9 @@ void PlutoSDRInputThread::run()
// Refill RX buffer
nbytes_rx = m_plutoBox->rxBufferRefill();
if (nbytes_rx != m_blockSizeSamples*2)
if (nbytes_rx != m_blockSizeSamples*4)
{
qWarning("PlutoSDRInputThread::run: error refilling buf (1) %d / %d",(int) nbytes_rx, (int) m_blockSizeSamples*2);
qWarning("PlutoSDRInputThread::run: error refilling buf %d / %d",(int) nbytes_rx, (int) m_blockSizeSamples*4);
usleep(200000);
continue;
}
@@ -105,39 +105,15 @@ void PlutoSDRInputThread::run()
p_end = m_plutoBox->rxBufferEnd();
ihs = 0;
// p_inc is 2 on a char* buffer therefore each iteration processes only the I or Q sample
// I and Q samples are processed one after the other
// p_inc is 4 on a char* buffer therefore each iteration processes a single IQ sample,
// I and Q each being two bytes
// conversion is not needed as samples are little endian
for (p_dat = m_plutoBox->rxBufferFirst(); p_dat < p_end; p_dat += p_inc)
{
m_buf[ihs] = *((int16_t *) p_dat);
m_buf[ihs++] = *((int16_t *) p_dat);
m_buf[ihs++] = *(((int16_t *) p_dat) + 1);
// iio_channel_convert(m_plutoBox->getRxChannel0(), (void *) &m_bufConv[ihs], (const void *) &m_buf[ihs]);
ihs++;
}
// Refill RX buffer again - we still need twice more samples to complete since they come as I followed by Q
nbytes_rx = m_plutoBox->rxBufferRefill();
if (nbytes_rx != m_blockSizeSamples*2)
{
qWarning("PlutoSDRInputThread::run: error refilling buf (2) %d / %d",(int) nbytes_rx, (int) m_blockSizeSamples*2);
usleep(200000);
continue;
}
// READ: Get pointers to RX buf and read IQ from RX buf port 0
p_end = m_plutoBox->rxBufferEnd();
// p_inc is 2 on a char* buffer therefore each iteration processes only the I or Q sample
// I and Q samples are processed one after the other
// conversion is not needed as samples are little endian
for (p_dat = m_plutoBox->rxBufferFirst(); p_dat < p_end; p_dat += p_inc)
{
m_buf[ihs] = *((int16_t *) p_dat);
// iio_channel_convert(m_plutoBox->getRxChannel0(), (void *) &m_bufConv[ihs], (const void *) &m_buf[ihs]);
ihs++;
}
if (m_iqOrder) {