111 lines
3.6 KiB
C++
111 lines
3.6 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) 2016,2017
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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_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H
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#define INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H
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#include <satnogs/config.h>
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#include <satnogs/upsat_fsk_frame_acquisition.h>
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#include <satnogs/whitening.h>
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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 upsat_fsk_frame_acquisition_impl : public upsat_fsk_frame_acquisition
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{
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private:
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/**
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* Decoding FSM
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*/
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typedef enum
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{
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SEARCHING, //!< SEARCHING when searching for the start of the preamble
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HAVE_PREAMBLE, //!< HAVE_PREAMBLE when the decoder is inside the preamble
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SEARCHING_SYNC_WORD,
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HAVE_SYNC_WORD, //!< HAVE_SYNC_WORD when the decoder is inside the sync word
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HAVE_FRAME_LEN, //!< HAVE_FRAME_LEN when the decoder is inside the frame length field
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HAVE_PAYLOAD //!< HAVE_PAYLOAD when the decoder process the palyload of the frame
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} decoding_state_t;
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const std::vector<uint8_t> d_preamble;
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const size_t d_preamble_len;
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const std::vector<uint8_t> d_sync_word;
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const size_t d_sync_word_len;
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const size_t d_search_for_sync_thrhld;
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const bool d_whitening;
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const bool d_manchester;
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const bool d_check_crc;
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const bool d_is_ax25;
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const bool d_var_packet_len;
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decoding_state_t d_state;
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uint8_t d_shifting_byte;
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size_t d_decoded_bytes;
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size_t d_decoded_bits;
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size_t d_frame_len;
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whitening d_descrambler;
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uint8_t *d_pdu;
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uint8_t *d_ax25_tmp_buf;
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uint8_t *d_ax25_buf;
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inline void
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slice_and_shift (float in);
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inline void
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reset_state ();
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inline void
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have_preamble ();
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inline void
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searching_sync_word ();
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inline void
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have_sync ();
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inline void
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have_frame_len ();
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inline void
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have_payload ();
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inline void
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unpack_ax25_bytes (size_t len_bytes);
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public:
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upsat_fsk_frame_acquisition_impl (const std::vector<uint8_t> &preamble,
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const std::vector<uint8_t> &sync_word,
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bool whitening, bool manchester,
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bool check_crc, bool ax25_format,
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uint32_t whitening_mask,
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uint32_t whitening_seed,
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uint32_t whitening_order,
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size_t packet_len);
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~upsat_fsk_frame_acquisition_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_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H */
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