92 lines
3.4 KiB
C++
92 lines
3.4 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) 2016,2017,
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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_H
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#define INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_H
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#include <satnogs/api.h>
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#include <gnuradio/sync_block.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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/*!
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* \brief This block takes samples after the Clock Recovery block
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* and tries to extract frames. This is performed by searching for a
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* known preamble. For the byte synchronization the block tries to
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* search for the specified synchronization word that should be present
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* before the start of the payload.
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*
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* \ingroup satnogs
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*
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*/
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class SATNOGS_API upsat_fsk_frame_acquisition : virtual public gr::sync_block
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{
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public:
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typedef boost::shared_ptr<upsat_fsk_frame_acquisition> sptr;
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/*!
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* Creates the FSK frame acquisition block for the UPSAT satellite.
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* @param preamble the bytes that consist the preamble of the frame
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*
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* @param sync_word the byte synchronization word
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*
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* @param whitening true if the transmitted data have been processed by
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* the whitening algorithm of the CC1120 chip. False otherwise.
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*
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* @param manchester true if the transmitted data have been processed by
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* the Manchester algorithm of the CC1120 chip. False otherwise.
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*
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* @param check_crc if set to true the decoder will push frames only if
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* their CRC field in correct.
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*
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* @param ax25_format if set to true the frame contains an AX.25
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* encoded payload. Prior producing the payload, AX.25 decoding
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* will be performed. If set to false, the payload will be pushed
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* as it is.
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*
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* @param whitening_mask the polynomial of the scrambler
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* @param whitening_seed the initial seed of the scrambler
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* @param whitening_order the size of the scrambler's LFSR
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* @param packet_len if set to 0 the decoder enters the variable
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* packet length mode, where the packet length is indicated from the
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* first byte after the SYNC word. Otherwise this field specifies the
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* payload length in bytes.
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*/
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static sptr
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make (const std::vector<uint8_t> &preamble,
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const std::vector<uint8_t> &sync_word, bool whitening = false,
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bool manchester = false, bool check_crc = true,
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bool ax25_format = false,
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uint32_t whitening_mask = 0x1001,
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uint32_t whitening_seed = 0x1FF,
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uint32_t whitening_order = 17,
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size_t packet_len = 0);
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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_H */
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