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https://github.com/AlexandreRouma/SDRPlusPlus.git
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add ryfi decoder module
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86
decoder_modules/ryfi_decoder/src/ryfi/framing.h
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86
decoder_modules/ryfi_decoder/src/ryfi/framing.h
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#pragma once
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#include "dsp/processor.h"
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#include <stdint.h>
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namespace ryfi {
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// Synchronization word.
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inline const uint64_t SYNC_WORD = 0x341CC540819D8963;
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// Number of synchronization bits.
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inline const int SYNC_BITS = 64;
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// Number of synchronization symbols.
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inline const int SYNC_SYMS = SYNC_BITS / 2;
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// Possible constellation rotations
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enum {
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ROT_0_DEG = 0,
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ROT_90_DEG = 1,
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ROT_180_DEG = 2,
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ROT_270_DEG = 3
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};
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/**
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* RyFi Framer.
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*/
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class Framer : public dsp::Processor<uint8_t, dsp::complex_t> {
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using base_type = dsp::Processor<uint8_t, dsp::complex_t>;
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public:
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/**
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* Create a framer specifying an input stream.
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* @param in Input stream.
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*/
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Framer(dsp::stream<uint8_t>* in = NULL);
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/**
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* Encode a frame to symbols adding a sync word.
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*/
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int encode(const uint8_t* in, dsp::complex_t* out, int count);
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private:
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int run();
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dsp::complex_t syncSyms[SYNC_SYMS];
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};
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class Deframer : public dsp::Processor<dsp::complex_t, dsp::complex_t> {
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using base_type = dsp::Processor<dsp::complex_t, dsp::complex_t>;
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public:
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/**
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* Create a deframer specifying an input stream.
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* @param in Input stream.
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*/
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Deframer(dsp::stream<dsp::complex_t> *in = NULL);
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private:
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int run();
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inline static constexpr int distance(uint64_t a, uint64_t b) {
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int dist = 0;
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for (int i = 0; i < 64; i++) {
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dist += ((a & 1) != (b & 1));
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a >>= 1;
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b >>= 1;
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}
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return dist;
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}
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// Frame reading counters
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int recv = 0;
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int outCount = 0;
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// Rotation handling
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int knownRot = 0;
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uint64_t syncRots[4];
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dsp::complex_t symRot;
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const dsp::complex_t symRots[4] = {
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{ 1.0f, 0.0f }, // 0 deg
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{ 0.0f, -1.0f }, // 90 deg
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{ -1.0f, 0.0f }, // 180 deg
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{ 0.0f, 1.0f }, // 270 deg
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};
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// Shift register
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uint64_t shift;
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};
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}
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