lorademod.h

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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// (C) 2015 John Greb                                                            //
//                                                                               //
// 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_LoRaDEMOD_H
#define INCLUDE_LoRaDEMOD_H

#include <QMutex>
#include <vector>

#include "dsp/basebandsamplesink.h"
#include "channel/channelapi.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "util/message.h"
#include "dsp/fftfilt.h"

#include "lorademodsettings.h"

#define DATA_BITS (6)
#define SAMPLEBITS (DATA_BITS + 2)
#define SPREADFACTOR (1 << SAMPLEBITS)
#define LORA_SFFT_LEN (SPREADFACTOR / 2)
#define LORA_SQUELCH (3)

class DeviceAPI;
class ThreadedBasebandSampleSink;
class DownChannelizer;

class LoRaDemod : public BasebandSampleSink, public ChannelAPI {
public:
    class MsgConfigureLoRaDemod : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        const LoRaDemodSettings& getSettings() const { return m_settings; }
        bool getForce() const { return m_force; }

        static MsgConfigureLoRaDemod* create(const LoRaDemodSettings& settings, bool force)
        {
            return new MsgConfigureLoRaDemod(settings, force);
        }

    private:
        LoRaDemodSettings m_settings;
        bool m_force;

        MsgConfigureLoRaDemod(const LoRaDemodSettings& settings, bool force) :
            Message(),
            m_settings(settings),
            m_force(force)
        { }
    };

    class MsgConfigureChannelizer : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        int getSampleRate() const { return m_sampleRate; }
        int getCenterFrequency() const { return m_centerFrequency; }

        static MsgConfigureChannelizer* create(int sampleRate, int centerFrequency)
        {
            return new MsgConfigureChannelizer(sampleRate, centerFrequency);
        }

    private:
        int m_sampleRate;
        int  m_centerFrequency;

        MsgConfigureChannelizer(int sampleRate, int centerFrequency) :
            Message(),
            m_sampleRate(sampleRate),
            m_centerFrequency(centerFrequency)
        { }
    };

    LoRaDemod(DeviceAPI* deviceAPI);
    virtual ~LoRaDemod();
    virtual void destroy() { delete this; }
    void setSpectrumSink(BasebandSampleSink* sampleSink) { m_sampleSink = sampleSink; }

    virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool pO);
    virtual void start();
    virtual void stop();
    virtual bool handleMessage(const Message& cmd);

    virtual void getIdentifier(QString& id) { id = objectName(); }
    virtual void getTitle(QString& title) { title = m_settings.m_title; }
    virtual qint64 getCenterFrequency() const { return 0; }

    virtual QByteArray serialize() const;
    virtual bool deserialize(const QByteArray& data);

    virtual int getNbSinkStreams() const { return 1; }
    virtual int getNbSourceStreams() const { return 0; }

    virtual qint64 getStreamCenterFrequency(int streamIndex, bool sinkElseSource) const
    {
        (void) streamIndex;
        (void) sinkElseSource;
        return 0;
    }

    static const QString m_channelIdURI;
    static const QString m_channelId;

private:
    int  detect(Complex sample, Complex angle);
    void dumpRaw(void);
    short synch (short bin);
    short toGray(short bin);
    void interleave6(char* inout, int size);
    void hamming6(char* inout, int size);
    void prng6(char* inout, int size);

    DeviceAPI *m_deviceAPI;
    ThreadedBasebandSampleSink* m_threadedChannelizer;
    DownChannelizer* m_channelizer;
    LoRaDemodSettings m_settings;

    Real m_Bandwidth;
    int m_sampleRate;
    int m_frequency;
    int m_chirp;
    int m_angle;
    int m_bin;
    int m_result;
    int m_count;
    int m_header;
    int m_time;
    short m_tune;

    sfft* loraFilter;
    sfft* negaFilter;
    float* mov;
    short* history;
    short* finetune;

    NCO m_nco;
    Interpolator m_interpolator;
    Real m_sampleDistanceRemain;

    BasebandSampleSink* m_sampleSink;
    SampleVector m_sampleBuffer;
    QMutex m_settingsMutex;
};

#endif // INCLUDE_LoRaDEMOD_H