kopia lustrzana https://github.com/rpp0/gr-lora
108 wiersze
3.5 KiB
C
108 wiersze
3.5 KiB
C
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/* -*- c++ -*- */
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/*
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* Copyright 2016 Pieter Robyns.
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*
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* This 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; either version 3, or (at your option)
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* any later version.
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*
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* This software 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 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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_LORA_DECODER_IMPL_H
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#define INCLUDED_LORA_DECODER_IMPL_H
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#include <lora/decoder.h>
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#include <list>
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#include <string>
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#include <vector>
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#include <fstream>
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namespace gr {
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namespace lora {
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typedef enum decoder_state {
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DETECT,
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SYNC,
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PAUSE,
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DECODE_HEADER,
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DECODE_PAYLOAD,
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STOP
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} decoder_state;
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class decoder_impl : public decoder
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{
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private:
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decoder_state d_state;
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std::vector<gr_complex> d_downchirp;
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std::vector<gr_complex> d_downchirp_fft;
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std::vector<gr_complex> d_fft;
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std::vector<gr_complex> d_mult;
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int32_t d_finetune;
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uint8_t d_sf;
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uint32_t d_bw;
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uint8_t d_cr;
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double d_bits_per_second;
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uint32_t d_samples_per_second;
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double d_symbols_per_second;
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uint32_t d_bits_per_symbol;
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uint32_t d_samples_per_symbol;
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uint32_t d_number_of_bins;
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uint32_t d_number_of_bins_hdr;
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uint32_t d_compression;
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uint32_t d_payload_symbols;
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uint32_t d_payload_length;
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uint32_t d_corr_fails;
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std::vector<unsigned int> d_words;
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std::vector<uint8_t> d_demodulated;
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std::vector<uint8_t> d_words_deshuffled;
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std::vector<uint8_t> d_words_dewhitened;
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std::vector<uint8_t> d_data;
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std::ofstream d_debug_samples;
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std::ofstream d_debug;
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fftplan d_q;
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bool calc_energy_threshold(gr_complex* samples, int window_size, float threshold);
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void build_ideal_downchirp(void);
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void samples_to_file(const std::string path, const gr_complex* v, int length, int elem_size);
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void samples_debug(const gr_complex* v, int length);
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double freq_cross_correlate(const gr_complex *samples_1, const gr_complex *samples_2, int window);
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int sync_fft(const gr_complex* samples);
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unsigned int max_frequency_gradient_idx(gr_complex* samples);
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bool demodulate(gr_complex* samples, bool is_header);
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void deinterleave(int ppm);
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int decode(uint8_t* out_data, bool is_header);
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void deshuffle(const uint8_t* shuffle_pattern);
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void dewhiten(const uint8_t* prng);
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void hamming_decode(uint8_t* out_data);
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void nibble_reverse(uint8_t* out_data, int len);
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inline void phase(gr_complex* in_samples, float* out_phase, int window);
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public:
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decoder_impl(int finetune);
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~decoder_impl();
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// Where all the action really happens
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int work(int noutput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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// GRC interfaces
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virtual void set_finetune(int32_t finetune);
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};
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} // namespace lora
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} // namespace gr
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#endif /* INCLUDED_LORA_DECODER_IMPL_H */
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