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PlutoSDR: set FIR filter (2)

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This commit is contained in:
f4exb 2017-09-07 18:41:55 +02:00
parent 7acd2bb7ed
commit 11b657a841
6 changed files with 121 additions and 10 deletions
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35
devices/plutosdr/deviceplutosdrbox.cpp
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@ -15,7 +15,6 @@
///////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cstring>
#include <regex>
@ -23,6 +22,7 @@
#include <boost/lexical_cast.hpp>
#include <QtGlobal>
#include "dsp/wfir.h"
#include "deviceplutosdrbox.h"
DevicePlutoSDRBox::DevicePlutoSDRBox(const std::string& uri) :
@ -397,13 +397,20 @@ bool DevicePlutoSDRBox::parseSampleRates(const std::string& rateStr, SampleRates
}
}
void DevicePlutoSDRBox::set_filterBW(DeviceUse use, uint32_t intdec, uint32_t bw)
void DevicePlutoSDRBox::setFIR(DeviceUse use, uint32_t intdec, uint32_t bw, int gain)
{
SampleRates sampleRates;
std::ostringstream ostr;
uint32_t nbTaps;
float normalizedBW;
double normalizedBW;
// set a dummy minimal filter first to get the sample rates right
formatFIRHeader(ostr, use, intdec, gain);
formatFIRCoefficients(ostr, 16, 0.5);
setFilter(ostr.str());
ostr.str(""); // reset string stream
if (use == USE_RX)
{
@ -428,7 +435,27 @@ void DevicePlutoSDRBox::set_filterBW(DeviceUse use, uint32_t intdec, uint32_t bw
normalizedBW = ((float) bw) / sampleRates.m_hb1Rate;
normalizedBW = normalizedBW < 0.1 ? 0.1 : normalizedBW > 0.9 ? 0.9 : normalizedBW;
}
// set the right filter
formatFIRHeader(ostr, use, intdec, gain);
formatFIRCoefficients(ostr, nbTaps, normalizedBW);
setFilter(ostr.str());
}
void DevicePlutoSDRBox::formatFIRHeader(std::ostringstream& ostr, DeviceUse use, uint32_t intdec, int32_t gain)
{
ostr << use == USE_RX ? "RX 1" : "TX 1" << " GAIN " << gain << " DEC " << intdec << std::endl;
}
void DevicePlutoSDRBox::formatFIRCoefficients(std::ostringstream& ostr, uint32_t nbTaps, double normalizedBW)
{
double fcoeffs = new double[nbTaps];
WFIR::BasicFIR(fcoeffs, nbTaps, WFIR::LPF, 0.0, normalizedBW, WFIR::wtBLACKMAN_HARRIS, 0.0);
for (int i = 0; i < nbTaps; i++) {
ostr << (uint16_t) (fcoeffs[i] * 32768.0) << std::endl;
}
}

5
devices/plutosdr/deviceplutosdrbox.h
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@ -17,6 +17,7 @@
#ifndef DEVICES_PLUTOSDR_DEVICEPLUTOSDRBOX_H_
#define DEVICES_PLUTOSDR_DEVICEPLUTOSDRBOX_H_
#include <sstream>
#include <stdint.h>
#include <sys/types.h>
#include "deviceplutosdrscan.h"
@ -79,7 +80,7 @@ public:
char* txBufferFirst();
bool getRxSampleRates(SampleRates& sampleRates);
bool getTxSampleRates(SampleRates& sampleRates);
void set_filterBW(DeviceUse use, uint32_t intdec, uint32_t bw);
void setFIR(DeviceUse use, uint32_t intdec, uint32_t bw, int gain);
private:
struct iio_context *m_ctx;
@ -94,6 +95,8 @@ private:
bool parseSampleRates(const std::string& rateStr, SampleRates& sampleRates);
void set_filter(const std::string& filterConfigStr);
void formatFIRHeader(std::ostringstream& str, DeviceUse use, uint32_t intdec, int32_t gain);
void formatFIRCoefficients(std::ostringstream& str, uint32_t nbTaps, double normalizedBW);
};
#endif /* DEVICES_PLUTOSDR_DEVICEPLUTOSDRBOX_H_ */

83
plugins/samplesource/plutosdrinput/plutosdrinput.cpp
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@ -242,11 +242,13 @@ void PlutoSDRInput::resumeBuddies()
bool PlutoSDRInput::applySettings(const PlutoSDRInputSettings& settings, bool force)
{
bool forwardChangeOwnDSP = false;
bool forwardChangeAllDSP = false;
bool forwardChangeOtherDSP = false;
bool suspendOwnThread = false;
bool ownThreadWasRunning = false;
bool suspendAllOtherThreads = false; // All others means Tx in fact
bool doCalibration = false;
bool firFilterSet = false;
DevicePlutoSDRBox *plutoBox = m_deviceShared.m_deviceParams->getBox();
// determine if buddies threads or own thread need to be suspended
@ -299,7 +301,7 @@ bool PlutoSDRInput::applySettings(const PlutoSDRInputSettings& settings, bool fo
// TODO: apply settings (all cases)
// Change affecting device baseband sample rate potentially affecting all buddies device/host sample rate
// Change affecting device sample rate chain potentially affecting other buddies device/host sample rate
if ((m_settings.m_devSampleRate != settings.m_devSampleRate) ||
(m_settings.m_rateGovernor != settings.m_rateGovernor) ||
(m_settings.m_lpfFIRlog2Decim != settings.m_lpfFIRlog2Decim) ||
@ -310,10 +312,71 @@ bool PlutoSDRInput::applySettings(const PlutoSDRInputSettings& settings, bool fo
QString rateGovStr;
PlutoSDRInputSettings::translateGovernor(settings.m_rateGovernor, rateGovStr);
params.push_back(QString(tr("trx_rate_governor=%1").arg(rateGovStr)).toStdString());
params.push_back(QString(tr("in_voltage_filter_fir_en=%1").arg(settings.m_lpfFIREnable ? 1 : 0)).toStdString());
forwardChangeAllDSP = true;
plutoBox->set_params(DevicePlutoSDRBox::DEVICE_PHY, params); // set end point frequency and rate governor first
// Unless unconditionally forced to change settings change FIR settings if FIR is enabled AND
// - FIR was not enabled before OR
// - Host interface sample rate has changed OR
// - Decimation chain rate governor has changed OR
// - FIR decimation has changed
if ((settings.m_lpfFIREnable && (!m_settings.m_lpfFIREnable
|| (m_settings.m_devSampleRate != settings.m_devSampleRate)
|| (m_settings.m_rateGovernor != settings.m_rateGovernor)
|| (m_settings.m_lpfFIRlog2Decim != settings.m_lpfFIRlog2Decim))) || force)
{
plutoBox->set_filterBW(DevicePlutoSDRBox::USE_RX, (1<<settings.m_lpfFIRlog2Decim), settings.m_lpfFIRBW, settings.m_lpfFIRGain);
firFilterSet = true;
}
// Reset the filter if gain or bandwidth changes without change to any of the sample rates and not done at previous step
if (((settings.m_lpfFIRBW != m_settings.m_lpfFIRBW) ||
(settings.m_lpfFIRGain != m_settings.m_lpfFIRGain)) && !firFilterSet)
{
plutoBox->set_filterBW(DevicePlutoSDRBox::USE_RX, (1<<settings.m_lpfFIRlog2Decim), settings.m_lpfFIRBW, settings.m_lpfFIRGain);
firFilterSet = true;
}
if ((m_settings.m_lpfFIREnable != settings.m_lpfFIREnable) || force)
{
params.clear();
params.push_back(QString(tr("in_voltage_filter_fir_en=%1").arg(settings.m_lpfFIREnable ? 1 : 0)).toStdString());
plutoBox->set_params(DevicePlutoSDRBox::DEVICE_PHY, params); // eventually enable/disable FIR
}
plutoBox->getRxSampleRates(m_deviceSampleRates); // pick up possible new rates
qDebug() << "PlutoSDRInput::applySettings: BBPLL: " << m_deviceSampleRates.m_bbRate
<< " ADC: " << m_deviceSampleRates.m_addaConnvRate
<< " -HB3-> " << m_deviceSampleRates.m_hb3Rate
<< " -HB2-> " << m_deviceSampleRates.m_hb2Rate
<< " -HB1-> " << m_deviceSampleRates.m_hb1Rate
<< " -FIR-> " << m_deviceSampleRates.m_firRate;
forwardChangeOtherDSP = true;
forwardChangeOwnDSP = (m_settings.m_devSampleRate != settings.m_devSampleRate);
}
if ((m_settings.m_log2Decim != settings.m_log2Decim) || force)
{
if (m_plutoSDRInputThread != 0)
{
m_plutoSDRInputThread->setLog2Decimation(settings.m_log2Decim);
qDebug() << "PlutoSDRInput::applySettings: set soft decimation to " << (1<<m_settings.m_log2Decim);
}
forwardChangeOwnDSP = true;
}
if ((m_settings.m_centerFrequency != settings.m_centerFrequency) || force)
{
std::vector<std::string> params;
params.push_back(QString(tr("in_voltage_sampling_frequency=%1").arg(settings.m_centerFrequency)).toStdString());
plutoBox->set_params(DevicePlutoSDRBox::DEVICE_PHY, params);
forwardChangeOwnDSP = true;
}
m_settings = settings;
if (suspendAllOtherThreads)
{
const std::vector<DeviceSinkAPI*>& sinkBuddies = m_deviceAPI->getSinkBuddies();
@ -336,5 +399,17 @@ bool PlutoSDRInput::applySettings(const PlutoSDRInputSettings& settings, bool fo
}
}
// TODO: forward changes to other (Tx) DSP
if (forwardChangeOwnDSP)
{
qDebug("PlutoSDRInput::applySettings: forward change to self");
int sampleRate = m_settings.m_devSampleRate/(1<<m_settings.m_log2Decim);
DSPSignalNotification *notif = new DSPSignalNotification(sampleRate, m_settings.m_centerFrequency);
m_fileSink->handleMessage(*notif); // forward to file sink
m_deviceAPI->getDeviceInputMessageQueue()->push(notif);
}
return false;
}

3
plugins/samplesource/plutosdrinput/plutosdrinput.h
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@ -86,6 +86,8 @@ public:
virtual bool handleMessage(const Message& message);
uint32_t getADCSampleRate() const { return m_deviceSampleRates.m_addaConnvRate; }
private:
DeviceSourceAPI *m_deviceAPI;
FileRecord *m_fileSink;
@ -95,6 +97,7 @@ public:
DevicePlutoSDRShared m_deviceShared;
struct iio_buffer *m_plutoRxBuffer;
PlutoSDRInputThread *m_plutoSDRInputThread;
DevicePlutoSDRBox::SampleRates m_deviceSampleRates;
QMutex m_mutex;
bool openDevice();

2
plugins/samplesource/plutosdrinput/plutosdrinputsettings.cpp
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@ -49,6 +49,7 @@ QByteArray PlutoSDRInputSettings::serialize() const
SimpleSerializer s(1);
s.writeS32(1, m_LOppmTenths);
s.writeS32(2, m_lpfFIRGain);
s.writeU32(3, m_lpfFIRlog2Decim);
s.writeU32(4, m_log2Decim);
s.writeS32(5, m_fcPos);
@ -82,6 +83,7 @@ bool PlutoSDRInputSettings::deserialize(const QByteArray& data)
uint32_t uintval;
d.readS32(1, &m_LOppmTenths, 0);
d.readS32(2, &m_lpfFIRGain, 0);
d.readU32(3, &uintval, 0);
if (uintval > 2) {
m_lpfFIRlog2Decim = 2;

1
plugins/samplesource/plutosdrinput/plutosdrinputsettings.h
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@ -72,6 +72,7 @@ struct PlutoSDRInputSettings {
bool m_lpfFIREnable; //!< enable digital lowpass FIR filter
float m_lpfFIRBW; //!< digital lowpass FIR filter bandwidth (Hz)
quint32 m_lpfFIRlog2Decim; //!< digital lowpass FIR filter log2 of decimation factor (0..2)
int m_lpfFIRGain; //!< digital lowpass FIR filter gain (dB)
uint32_t m_gain; //!< "hardware" gain
RFPath m_antennaPath;
GainMode m_gainMode;