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