Add support for arbitraty descrambling polynomials on the FSK receiver
This commit is contained in:
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@ -3,7 +3,7 @@
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<name>UPSAT FSK Frame Acquisition</name>
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<key>satnogs_upsat_fsk_frame_acquisition</key>
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<import>import satnogs</import>
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<make>satnogs.upsat_fsk_frame_acquisition($preamble, $sync_word, $whitening, $manchester, $check_crc, $ax_25)</make>
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<make>satnogs.upsat_fsk_frame_acquisition($preamble, $sync_word, $whitening, $manchester, $check_crc, $ax_25, $whitening_mask, $whitening_seed, $whitening_order)</make>
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<param>
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<name>Frame Preamble</name>
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@ -73,6 +73,27 @@
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</option>
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</param>
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<param>
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<name>Whitening mask</name>
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<key>whitening_mask</key>
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<value>0x1001</value>
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<type>int</type>
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</param>
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<param>
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<name>Whitening seed</name>
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<key>whitening_seed</key>
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<value>0x1FF</value>
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<type>int</type>
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</param>
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<param>
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<name>Whitening order</name>
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<key>whitening_order</key>
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<value>17</value>
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<type>int</type>
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</param>
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<sink>
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<name>in</name>
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<type>float</type>
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@ -2,7 +2,8 @@
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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, Libre Space Foundation <http://librespacefoundation.org/>
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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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@ -63,12 +64,19 @@ namespace gr
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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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*/
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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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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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};
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} // namespace satnogs
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@ -2,7 +2,8 @@
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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, Libre Space Foundation <http://librespacefoundation.org/>
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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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@ -36,65 +37,70 @@ namespace gr
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upsat_fsk_frame_acquisition::sptr
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upsat_fsk_frame_acquisition::make (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,
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bool ax25_format)
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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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{
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return gnuradio::get_initial_sptr (
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new upsat_fsk_frame_acquisition_impl (preamble, sync_word, whitening,
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manchester, check_crc,
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ax25_format));
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new upsat_fsk_frame_acquisition_impl (preamble, sync_word, whitening,
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manchester, check_crc,
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ax25_format, whitening_mask,
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whitening_seed,
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whitening_order));
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}
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/*
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* The private constructor
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*/
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upsat_fsk_frame_acquisition_impl::upsat_fsk_frame_acquisition_impl (
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const std::vector<uint8_t> &preamble,
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const std::vector<uint8_t> &sync_word, bool whitening, bool manchester,
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bool check_crc, bool ax25_format) :
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gr::sync_block ("upsat_fsk_frame_acquisition",
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gr::io_signature::make (1, 1, sizeof(float)),
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gr::io_signature::make (0, 0, 0)),
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d_preamble (preamble),
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d_preamble_len (preamble.size ()),
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d_sync_word (sync_word),
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d_sync_word_len (sync_word.size ()),
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/*
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* Preamble is used only for AGC. The true synchronization is
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* performed using the SYNC word. For this reason if some preamble
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* symbols are retrieved, the algorithm should immediately start
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* searching for the SYNC word.
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*/
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d_search_for_sync_thrhld(d_preamble_len / 3),
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d_whitening(whitening),
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d_manchester(manchester),
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d_check_crc(check_crc),
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d_is_ax25(ax25_format),
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d_state (SEARCHING),
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d_shifting_byte (0x0),
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d_decoded_bytes (0),
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d_decoded_bits (0),
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d_frame_len (0),
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d_descrambler(0x1001, 0x1FF, 17)
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const std::vector<uint8_t> &preamble,
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const std::vector<uint8_t> &sync_word, bool whitening, bool manchester,
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bool check_crc, bool ax25_format, uint32_t whitening_mask,
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uint32_t whitening_seed, uint32_t whitening_order) :
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gr::sync_block ("upsat_fsk_frame_acquisition",
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gr::io_signature::make (1, 1, sizeof(float)),
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gr::io_signature::make (0, 0, 0)),
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d_preamble (preamble),
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d_preamble_len (preamble.size ()),
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d_sync_word (sync_word),
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d_sync_word_len (sync_word.size ()),
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/*
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* Preamble is used only for AGC. The true synchronization is
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* performed using the SYNC word. For this reason if some preamble
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* symbols are retrieved, the algorithm should immediately start
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* searching for the SYNC word.
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*/
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d_search_for_sync_thrhld (d_preamble_len / 3),
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d_whitening (whitening),
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d_manchester (manchester),
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d_check_crc (check_crc),
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d_is_ax25 (ax25_format),
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d_state (SEARCHING),
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d_shifting_byte (0x0),
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d_decoded_bytes (0),
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d_decoded_bits (0),
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d_frame_len (0),
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d_descrambler (whitening_mask, whitening_seed, whitening_order)
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{
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size_t i;
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message_port_register_out (pmt::mp ("pdu"));
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if (d_preamble_len < 3) {
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throw std::invalid_argument ("Preamble must be at least 2 bytes long");
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throw std::invalid_argument ("Preamble must be at least 2 bytes long");
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}
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if (d_sync_word_len < 1) {
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throw std::invalid_argument (
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"Synchronization word must be at least 1 byte long");
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throw std::invalid_argument (
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"Synchronization word must be at least 1 byte long");
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}
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for(i = 1; i < d_preamble_len; i++){
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if(d_preamble[i] != d_preamble[0]) {
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throw std::invalid_argument (
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"The preamble should contain the same bytes");
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}
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for (i = 1; i < d_preamble_len; i++) {
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if (d_preamble[i] != d_preamble[0]) {
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throw std::invalid_argument (
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"The preamble should contain the same bytes");
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}
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}
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d_pdu = new uint8_t[UPSAT_MAX_FRAME_LEN];
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@ -163,7 +169,7 @@ namespace gr
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upsat_fsk_frame_acquisition_impl::have_frame_len ()
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{
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LOG_DEBUG("Enter frame len");
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d_descrambler.reset();
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d_descrambler.reset ();
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d_state = HAVE_FRAME_LEN;
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d_decoded_bytes = 0;
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d_decoded_bits = 0;
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@ -184,29 +190,29 @@ namespace gr
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size_t i;
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uint8_t *in = d_pdu + 1;
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for(i = 0; i < len_bytes; i++){
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d_ax25_tmp_buf[8*i] = (in[i] >> 7) & 0x1;
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d_ax25_tmp_buf[8*i + 1] = (in[i] >> 6) & 0x1;
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d_ax25_tmp_buf[8*i + 2] = (in[i] >> 5) & 0x1;
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d_ax25_tmp_buf[8*i + 3] = (in[i] >> 4) & 0x1;
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d_ax25_tmp_buf[8*i + 4] = (in[i] >> 3) & 0x1;
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d_ax25_tmp_buf[8*i + 5] = (in[i] >> 2) & 0x1;
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d_ax25_tmp_buf[8*i + 6] = (in[i] >> 1) & 0x1;
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d_ax25_tmp_buf[8*i + 7] = in[i] & 0x1;
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for (i = 0; i < len_bytes; i++) {
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d_ax25_tmp_buf[8 * i] = (in[i] >> 7) & 0x1;
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d_ax25_tmp_buf[8 * i + 1] = (in[i] >> 6) & 0x1;
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d_ax25_tmp_buf[8 * i + 2] = (in[i] >> 5) & 0x1;
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d_ax25_tmp_buf[8 * i + 3] = (in[i] >> 4) & 0x1;
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d_ax25_tmp_buf[8 * i + 4] = (in[i] >> 3) & 0x1;
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d_ax25_tmp_buf[8 * i + 5] = (in[i] >> 2) & 0x1;
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d_ax25_tmp_buf[8 * i + 6] = (in[i] >> 1) & 0x1;
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d_ax25_tmp_buf[8 * i + 7] = in[i] & 0x1;
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}
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/* De-white the data if necessary */
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if (d_whitening) {
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d_descrambler.descramble_one_bit_per_byte (d_ax25_tmp_buf,
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d_ax25_tmp_buf,
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len_bytes * 8);
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d_descrambler.descramble_one_bit_per_byte (d_ax25_tmp_buf,
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d_ax25_tmp_buf,
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len_bytes * 8);
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}
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}
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int
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upsat_fsk_frame_acquisition_impl::work (
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int noutput_items, gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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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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int i;
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uint16_t crc_received;
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ax25_decode_status_t status;
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const float *in = (const float *) input_items[0];
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for (i = 0; i < noutput_items; i++) {
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slice_and_shift (in[i]);
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slice_and_shift (in[i]);
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switch (d_state)
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{
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case SEARCHING:
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if (d_shifting_byte == d_preamble[0]) {
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have_preamble ();
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}
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break;
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case HAVE_PREAMBLE:
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d_decoded_bits++;
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switch (d_state)
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{
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case SEARCHING:
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if (d_shifting_byte == d_preamble[0]) {
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have_preamble ();
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}
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break;
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case HAVE_PREAMBLE:
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d_decoded_bits++;
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if(d_decoded_bits == 8) {
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d_decoded_bits = 0;
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if(d_shifting_byte == d_preamble[d_decoded_bytes]){
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d_decoded_bytes++;
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if(d_decoded_bytes >= d_search_for_sync_thrhld){
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/* End of the preamble. It's time for the sync word */
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searching_sync_word();
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}
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}
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else{
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/* Reset the preamble detection */
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reset_state();
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}
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}
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break;
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case SEARCHING_SYNC_WORD:
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d_decoded_bits++;
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if(d_shifting_byte == d_sync_word[0]){
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have_sync();
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break;
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}
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if (d_decoded_bits == 8) {
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d_decoded_bits = 0;
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if (d_shifting_byte == d_preamble[d_decoded_bytes]) {
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d_decoded_bytes++;
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if (d_decoded_bytes >= d_search_for_sync_thrhld) {
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/* End of the preamble. It's time for the sync word */
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searching_sync_word ();
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}
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}
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else {
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/* Reset the preamble detection */
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reset_state ();
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}
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}
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break;
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case SEARCHING_SYNC_WORD:
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d_decoded_bits++;
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if (d_shifting_byte == d_sync_word[0]) {
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have_sync ();
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break;
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}
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if(d_decoded_bits == 8) {
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d_decoded_bits = 0;
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d_decoded_bytes++;
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/*
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* If we decoded bytes have length greater than the preamble and
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* the SYNC word, we lost the frame...
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*/
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if (d_decoded_bytes > d_preamble_len
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- d_search_for_sync_thrhld + d_sync_word_len) {
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reset_state ();
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}
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}
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break;
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case HAVE_SYNC_WORD:
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d_decoded_bits++;
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if(d_decoded_bits == 8) {
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d_decoded_bits = 0;
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if(d_shifting_byte == d_sync_word[d_decoded_bytes]) {
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d_decoded_bytes++;
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if(d_decoded_bytes == d_sync_word_len){
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have_frame_len();
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}
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}
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else{
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reset_state();
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}
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}
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break;
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case HAVE_FRAME_LEN:
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d_decoded_bits++;
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if(d_decoded_bits == 8) {
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if (d_decoded_bits == 8) {
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d_decoded_bits = 0;
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d_decoded_bytes++;
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/*
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* If we decoded bytes have length greater than the preamble and
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* the SYNC word, we lost the frame...
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*/
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if (d_decoded_bytes
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> d_preamble_len - d_search_for_sync_thrhld
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+ d_sync_word_len) {
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reset_state ();
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}
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}
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break;
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case HAVE_SYNC_WORD:
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d_decoded_bits++;
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if (d_decoded_bits == 8) {
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d_decoded_bits = 0;
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if (d_shifting_byte == d_sync_word[d_decoded_bytes]) {
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d_decoded_bytes++;
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if (d_decoded_bytes == d_sync_word_len) {
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have_frame_len ();
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}
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}
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else {
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reset_state ();
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}
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}
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break;
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case HAVE_FRAME_LEN:
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d_decoded_bits++;
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if (d_decoded_bits == 8) {
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/* Length field has been whitened if the option is enabled */
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if(d_whitening){
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/* Frame length field is needed for the CRC calculation */
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d_descrambler.descramble(d_pdu, &d_shifting_byte, 1);
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/* CRC is not included in the frame length field, but we want it */
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d_frame_len = 1 + d_pdu[0] + sizeof(uint16_t);
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}
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else{
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/* Frame length field is needed for the CRC calculation */
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d_pdu[0] = d_shifting_byte;
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/* CRC is not included in the frame length field, but we want it */
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d_frame_len = 1 + d_shifting_byte + sizeof(uint16_t);
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}
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have_payload();
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}
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break;
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case HAVE_PAYLOAD:
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d_decoded_bits++;
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if (d_decoded_bits == 8) {
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d_decoded_bits = 0;
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d_pdu[d_decoded_bytes] = d_shifting_byte;
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d_decoded_bytes++;
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/* Length field has been whitened if the option is enabled */
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if (d_whitening) {
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/* Frame length field is needed for the CRC calculation */
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d_descrambler.descramble (d_pdu, &d_shifting_byte, 1);
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/* CRC is not included in the frame length field, but we want it */
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d_frame_len = 1 + d_pdu[0] + sizeof(uint16_t);
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}
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else {
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/* Frame length field is needed for the CRC calculation */
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d_pdu[0] = d_shifting_byte;
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/* CRC is not included in the frame length field, but we want it */
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d_frame_len = 1 + d_shifting_byte + sizeof(uint16_t);
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}
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have_payload ();
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}
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break;
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case HAVE_PAYLOAD:
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d_decoded_bits++;
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if (d_decoded_bits == 8) {
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d_decoded_bits = 0;
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d_pdu[d_decoded_bytes] = d_shifting_byte;
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d_decoded_bytes++;
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if (d_decoded_bytes == d_frame_len) {
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if(d_is_ax25) {
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if (d_decoded_bytes == d_frame_len) {
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if (d_is_ax25) {
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unpack_ax25_bytes(d_frame_len - 1);
|
||||
status = ax25_decode(d_ax25_buf, &ax25_frame_len,
|
||||
d_ax25_tmp_buf, (d_frame_len - 1)*8);
|
||||
if(status == AX25_DEC_OK){
|
||||
/* Skip the AX.25 header */
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (d_ax25_buf + AX25_MIN_ADDR_LEN + 2,
|
||||
ax25_frame_len - AX25_MIN_ADDR_LEN - 2));
|
||||
}
|
||||
unpack_ax25_bytes (d_frame_len - 1);
|
||||
status = ax25_decode (d_ax25_buf, &ax25_frame_len,
|
||||
d_ax25_tmp_buf, (d_frame_len - 1) * 8);
|
||||
if (status == AX25_DEC_OK) {
|
||||
/* Skip the AX.25 header */
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (
|
||||
d_ax25_buf + AX25_MIN_ADDR_LEN + 2,
|
||||
ax25_frame_len - AX25_MIN_ADDR_LEN - 2));
|
||||
}
|
||||
|
||||
/*
|
||||
* We are done here. Whitening and FSK CRC is not supported
|
||||
* when transmitting/receiving AX.25 frames
|
||||
*/
|
||||
reset_state ();
|
||||
break;
|
||||
}
|
||||
/*
|
||||
* We are done here. Whitening and FSK CRC is not supported
|
||||
* when transmitting/receiving AX.25 frames
|
||||
*/
|
||||
reset_state ();
|
||||
break;
|
||||
}
|
||||
|
||||
if(d_whitening){
|
||||
d_descrambler.descramble(d_pdu+1, d_pdu+1, d_frame_len - 1);
|
||||
}
|
||||
if (d_whitening) {
|
||||
d_descrambler.descramble (d_pdu + 1, d_pdu + 1,
|
||||
d_frame_len - 1);
|
||||
}
|
||||
|
||||
if(!d_check_crc){
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (d_pdu + 1,
|
||||
d_frame_len - 1 - sizeof(uint16_t)));
|
||||
reset_state ();
|
||||
break;
|
||||
}
|
||||
if (!d_check_crc) {
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (d_pdu + 1,
|
||||
d_frame_len - 1 - sizeof(uint16_t)));
|
||||
reset_state ();
|
||||
break;
|
||||
}
|
||||
|
||||
/* Retrieve and check the CRC */
|
||||
memcpy(&crc_received, d_pdu + d_frame_len - sizeof(uint16_t),
|
||||
sizeof(uint16_t));
|
||||
/* The CRC is transmitted in network byte order */
|
||||
crc_received = ntohs(crc_received);
|
||||
crc_calc = crc16_ccitt(d_pdu, d_frame_len - sizeof(uint16_t));
|
||||
if(crc_calc == crc_received) {
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (d_pdu + 1,
|
||||
d_frame_len - 1 - sizeof(uint16_t)));
|
||||
}
|
||||
else{
|
||||
LOG_WARN("Frame with wrong CRC got 0x%x calc 0x%x",
|
||||
crc_received, crc_calc);
|
||||
}
|
||||
reset_state ();
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
LOG_WARN("Unknown decoding state");
|
||||
}
|
||||
/* Retrieve and check the CRC */
|
||||
memcpy (&crc_received, d_pdu + d_frame_len - sizeof(uint16_t),
|
||||
sizeof(uint16_t));
|
||||
/* The CRC is transmitted in network byte order */
|
||||
crc_received = ntohs (crc_received);
|
||||
crc_calc = crc16_ccitt (d_pdu, d_frame_len - sizeof(uint16_t));
|
||||
if (crc_calc == crc_received) {
|
||||
message_port_pub (
|
||||
pmt::mp ("pdu"),
|
||||
pmt::make_blob (d_pdu + 1,
|
||||
d_frame_len - 1 - sizeof(uint16_t)));
|
||||
}
|
||||
else {
|
||||
LOG_WARN("Frame with wrong CRC got 0x%x calc 0x%x",
|
||||
crc_received, crc_calc);
|
||||
}
|
||||
reset_state ();
|
||||
}
|
||||
}
|
||||
break;
|
||||
default:
|
||||
LOG_WARN("Unknown decoding state");
|
||||
}
|
||||
}
|
||||
|
||||
return noutput_items;
|
||||
|
|
|
@ -2,7 +2,8 @@
|
|||
/*
|
||||
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
|
||||
*
|
||||
* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
|
||||
* Copyright (C) 2016,2017
|
||||
* Libre Space Foundation <http://librespacefoundation.org/>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
|
@ -39,12 +40,12 @@ namespace gr
|
|||
*/
|
||||
typedef enum
|
||||
{
|
||||
SEARCHING, //!< SEARCHING when searching for the start of the preamble
|
||||
HAVE_PREAMBLE, //!< HAVE_PREAMBLE when the decoder is inside the preamble
|
||||
SEARCHING_SYNC_WORD,
|
||||
HAVE_SYNC_WORD, //!< HAVE_SYNC_WORD when the decoder is inside the sync word
|
||||
HAVE_FRAME_LEN, //!< HAVE_FRAME_LEN when the decoder is inside the frame length field
|
||||
HAVE_PAYLOAD //!< HAVE_PAYLOAD when the decoder process the palyload of the frame
|
||||
SEARCHING, //!< SEARCHING when searching for the start of the preamble
|
||||
HAVE_PREAMBLE, //!< HAVE_PREAMBLE when the decoder is inside the preamble
|
||||
SEARCHING_SYNC_WORD,
|
||||
HAVE_SYNC_WORD, //!< HAVE_SYNC_WORD when the decoder is inside the sync word
|
||||
HAVE_FRAME_LEN, //!< HAVE_FRAME_LEN when the decoder is inside the frame length field
|
||||
HAVE_PAYLOAD //!< HAVE_PAYLOAD when the decoder process the palyload of the frame
|
||||
} decoding_state_t;
|
||||
|
||||
const std::vector<uint8_t> d_preamble;
|
||||
|
@ -82,20 +83,22 @@ namespace gr
|
|||
inline void
|
||||
have_payload ();
|
||||
inline void
|
||||
unpack_ax25_bytes(size_t len_bytes);
|
||||
unpack_ax25_bytes (size_t len_bytes);
|
||||
|
||||
public:
|
||||
upsat_fsk_frame_acquisition_impl (const std::vector<uint8_t> &preamble,
|
||||
const std::vector<uint8_t> &sync_word,
|
||||
bool whitening, bool manchester,
|
||||
bool check_crc,
|
||||
bool ax25_format);
|
||||
const std::vector<uint8_t> &sync_word,
|
||||
bool whitening, bool manchester,
|
||||
bool check_crc, bool ax25_format,
|
||||
uint32_t whitening_mask,
|
||||
uint32_t whitening_seed,
|
||||
uint32_t whitening_order);
|
||||
~upsat_fsk_frame_acquisition_impl ();
|
||||
|
||||
// Where all the action really happens
|
||||
int
|
||||
work (int noutput_items, gr_vector_const_void_star &input_items,
|
||||
gr_vector_void_star &output_items);
|
||||
gr_vector_void_star &output_items);
|
||||
};
|
||||
|
||||
} // namespace satnogs
|
||||
|
|
Loading…
Reference in New Issue