94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2016,2018
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* Libre Space Foundation <http://librespacefoundation.org/>
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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, either 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 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 INCLUDED_SATNOGS_AX25_DECODER_BM_IMPL_H
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#define INCLUDED_SATNOGS_AX25_DECODER_BM_IMPL_H
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#include <satnogs/ax25_decoder_bm.h>
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#include <gnuradio/digital/lfsr.h>
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#include <deque>
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namespace gr
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{
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namespace satnogs
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{
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class ax25_decoder_bm_impl : public ax25_decoder_bm
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{
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private:
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typedef enum
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{
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NO_SYNC, IN_SYNC, DECODING
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} decoding_state_t;
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/**
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* If this flag is set, the decoder operates in promiscuous mode and
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* forwards all successfully decoded frames
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*/
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const bool d_promisc;
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const bool d_descramble;
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const size_t d_max_frame_len;
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decoding_state_t d_state;
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uint8_t d_shift_reg;
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uint8_t d_dec_b;
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uint8_t d_prev_bit_nrzi;
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size_t d_received_bytes;
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size_t d_decoded_bits;
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digital::lfsr d_lfsr;
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uint8_t *d_frame_buffer;
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std::deque<uint8_t> d_bitstream;
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size_t d_start_idx;
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void
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reset_state ();
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void
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enter_sync_state ();
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void
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enter_decoding_state ();
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bool
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enter_frame_end ();
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void
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decode ();
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inline void
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decode_1b (uint8_t in);
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bool
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frame_check();
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public:
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ax25_decoder_bm_impl (const std::string& addr, uint8_t ssid, bool promisc,
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bool descramble, size_t max_frame_len);
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~ax25_decoder_bm_impl ();
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// Where all the action really happens
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int
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work (int noutput_items, gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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};
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} // namespace satnogs
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} // namespace gr
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#endif /* INCLUDED_SATNOGS_AX25_DECODER_BM_IMPL_H */
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