mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-11-03 13:11:20 -05:00
113 lines
4.6 KiB
C++
113 lines
4.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2020 Edouard Griffiths, F4EXB //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef INCLUDE_CHIRPCHATMODSOURCE_H
|
|
#define INCLUDE_CHIRPCHATMODSOURCE_H
|
|
|
|
#include <QMutex>
|
|
|
|
#include "dsp/channelsamplesource.h"
|
|
#include "dsp/nco.h"
|
|
#include "dsp/interpolator.h"
|
|
#include "dsp/firfilter.h"
|
|
#include "util/movingaverage.h"
|
|
|
|
#include "chirpchatmodsettings.h"
|
|
|
|
class ChirpChatModSource : public ChannelSampleSource
|
|
{
|
|
public:
|
|
ChirpChatModSource();
|
|
virtual ~ChirpChatModSource();
|
|
|
|
virtual void pull(SampleVector::iterator begin, unsigned int nbSamples);
|
|
virtual void pullOne(Sample& sample);
|
|
virtual void prefetch(unsigned int nbSamples) { (void) nbSamples; }
|
|
|
|
double getMagSq() const { return m_magsq; }
|
|
void getLevels(qreal& rmsLevel, qreal& peakLevel, int& numSamples) const
|
|
{
|
|
rmsLevel = m_rmsLevel;
|
|
peakLevel = m_peakLevelOut;
|
|
numSamples = m_levelNbSamples;
|
|
}
|
|
void applySettings(const ChirpChatModSettings& settings, bool force = false);
|
|
void applyChannelSettings(int channelSampleRate, int bandwidth, int channelFrequencyOffset, bool force = false);
|
|
void setSymbols(const std::vector<unsigned short>& symbols);
|
|
bool getActive() const { return m_active; }
|
|
|
|
private:
|
|
enum ChirpChatState
|
|
{
|
|
ChirpChatStateIdle, //!< Quiet time
|
|
ChirpChatStatePreamble, //!< Transmit preamble
|
|
ChirpChatStateSyncWord, //!< Tramsmit sync word
|
|
ChirpChatStateSFD, //!< Transmit SFD
|
|
ChirpChatStatePayload //!< Tramsmoit payload
|
|
};
|
|
|
|
int m_channelSampleRate;
|
|
int m_channelFrequencyOffset;
|
|
int m_bandwidth;
|
|
ChirpChatModSettings m_settings;
|
|
|
|
ChirpChatState m_state;
|
|
double *m_phaseIncrements;
|
|
std::vector<unsigned short> m_symbols;
|
|
unsigned int m_fftLength; //!< chirp length in samples
|
|
unsigned int m_chirp; //!< actual chirp index in chirps table
|
|
unsigned int m_chirp0; //!< half index of chirp start in chirps table
|
|
unsigned int m_sampleCounter; //!< actual sample counter
|
|
unsigned int m_fftCounter; //!< chirp sample counter
|
|
unsigned int m_chirpCount; //!< chirp or quarter chirp counter
|
|
unsigned int m_quietSamples; //!< number of samples during quiet period
|
|
unsigned int m_quarterSamples; //!< number of samples in a quarter chirp
|
|
unsigned int m_repeatCount; //!< message repetition counter
|
|
bool m_active; //!< modulator is in a sending sequence (icluding periodic quiet times)
|
|
|
|
NCO m_carrierNco;
|
|
double m_modPhasor; //!< baseband modulator phasor
|
|
Complex m_modSample;
|
|
|
|
Interpolator m_interpolator;
|
|
Real m_interpolatorDistance;
|
|
Real m_interpolatorDistanceRemain;
|
|
bool m_interpolatorConsumed;
|
|
|
|
Bandpass<Real> m_bandpass;
|
|
|
|
double m_magsq;
|
|
MovingAverageUtil<double, double, 16> m_movingAverage;
|
|
|
|
quint32 m_levelCalcCount;
|
|
qreal m_rmsLevel;
|
|
qreal m_peakLevelOut;
|
|
Real m_peakLevel;
|
|
Real m_levelSum;
|
|
|
|
static const int m_levelNbSamples;
|
|
|
|
void initSF(unsigned int sf); //!< Init tables, FFTs, depending on spread factor
|
|
void initTest(unsigned int sf, unsigned int deBits);
|
|
void reset();
|
|
void calculateLevel(Real& sample);
|
|
void modulateSample();
|
|
unsigned short encodeSymbol(unsigned short symbol); //!< Encodes symbol with possible DE bits spacing
|
|
};
|
|
|
|
#endif // INCLUDE_CHIRPCHATMODSOURCE_H
|