mirror of https://github.com/f4exb/sdrangel.git
105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// (C) 2015 John Greb //
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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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// //
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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_LoRaDEMOD_H
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#define INCLUDE_LoRaDEMOD_H
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#include <QMutex>
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#include <vector>
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#include "dsp/samplesink.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "util/message.h"
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#include "dsp/fftfilt.h"
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#define DATA_BITS (6)
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#define SAMPLEBITS (DATA_BITS + 2)
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#define SPREADFACTOR (1 << SAMPLEBITS)
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#define LORA_SFFT_LEN (SPREADFACTOR / 2)
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#define LORA_SQUELCH (3)
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class LoRaDemod : public SampleSink {
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public:
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LoRaDemod(SampleSink* sampleSink);
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virtual ~LoRaDemod();
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void configure(MessageQueue* messageQueue, Real Bandwidth);
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool pO);
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virtual void start();
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virtual void stop();
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virtual bool handleMessage(const Message& cmd);
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private:
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int detect(Complex sample, Complex angle);
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void dumpRaw(void);
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short synch (short bin);
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short toGray(short bin);
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void interleave6(char* inout, int size);
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void hamming6(char* inout, int size);
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void prng6(char* inout, int size);
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class MsgConfigureLoRaDemod : public Message {
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MESSAGE_CLASS_DECLARATION
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public:
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Real getBandwidth() const { return m_Bandwidth; }
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static MsgConfigureLoRaDemod* create(Real Bandwidth)
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{
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return new MsgConfigureLoRaDemod(Bandwidth);
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}
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private:
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Real m_Bandwidth;
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MsgConfigureLoRaDemod(Real Bandwidth) :
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Message(),
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m_Bandwidth(Bandwidth)
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{
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}
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};
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Real m_Bandwidth;
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int m_sampleRate;
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int m_frequency;
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int m_chirp;
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int m_angle;
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int m_bin;
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int m_result;
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int m_count;
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int m_header;
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int m_time;
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short m_tune;
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sfft* loraFilter;
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sfft* negaFilter;
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float* mov;
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short* history;
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short* finetune;
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NCO m_nco;
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Interpolator m_interpolator;
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Real m_sampleDistanceRemain;
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SampleSink* m_sampleSink;
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SampleVector m_sampleBuffer;
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QMutex m_settingsMutex;
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};
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#endif // INCLUDE_LoRaDEMOD_H
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