107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
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/* -*- 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) 2018, 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "frame_acquisition_impl.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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frame_acquisition::sptr
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frame_acquisition::make (const std::vector<uint8_t>& preamble,
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size_t preamble_threshold,
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const std::vector<uint8_t>& sync,
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size_t sync_threshold)
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{
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return gnuradio::get_initial_sptr (
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new frame_acquisition_impl (preamble, preamble_threshold, sync,
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sync_threshold));
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}
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frame_acquisition_impl::frame_acquisition_impl (
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const std::vector<uint8_t>& preamble, size_t preamble_threshold,
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const std::vector<uint8_t>& sync, size_t sync_threshold) :
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gr::sync_block ("frame_acquisition",
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gr::io_signature::make (1, 1, sizeof(uint8_t)),
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gr::io_signature::make (0, 0, 0)),
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d_preamble(preamble.size() * 8),
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d_preamble_len(preamble.size() * 8),
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d_preamble_thrsh(preamble_threshold),
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d_sync(sync.size() * 8),
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d_sync_len(sync.size() * 8),
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d_sync_thrsh(sync_threshold)
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{
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set_output_multiple(8);
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for(uint8_t b : preamble) {
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d_preamble <<= (b >> 7);
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d_preamble <<= ((b >> 6) & 0x1);
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d_preamble <<= ((b >> 6) & 0x1);
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d_preamble <<= ((b >> 5) & 0x1);
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d_preamble <<= ((b >> 4) & 0x1);
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d_preamble <<= ((b >> 3) & 0x1);
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d_preamble <<= ((b >> 2) & 0x1);
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d_preamble <<= ((b >> 1) & 0x1);
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d_preamble <<= (b & 0x1);
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}
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for(uint8_t b : sync) {
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d_sync <<= (b >> 7);
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d_sync <<= ((b >> 6) & 0x1);
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d_sync <<= ((b >> 6) & 0x1);
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d_sync <<= ((b >> 5) & 0x1);
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d_sync <<= ((b >> 4) & 0x1);
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d_sync <<= ((b >> 3) & 0x1);
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d_sync <<= ((b >> 2) & 0x1);
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d_sync <<= ((b >> 1) & 0x1);
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d_sync <<= (b & 0x1);
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}
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}
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/*
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* Our virtual destructor.
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*/
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frame_acquisition_impl::~frame_acquisition_impl ()
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{
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}
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int
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frame_acquisition_impl::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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{
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const uint8_t *in = (const uint8_t *) input_items[0];
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// Do <+signal processing+>
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// Tell runtime system how many output items we produced.
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return noutput_items;
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}
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} /* namespace satnogs */
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} /* namespace gr */
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