jens
5df2d7d90f
git-svn-id: http://moon:8086/svn/software/trunk/projects/GnuRadio@390 b431acfa-c32f-4a4a-93f1-934dc6c82436
159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2019 Jay Arrowfield.
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*
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* This 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, or (at your option)
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* any later version.
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*
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* This software 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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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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 "preamble_sync_impl.h"
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namespace gr
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{
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namespace jay
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{
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preamble_sync::sptr preamble_sync::make()
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{
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return gnuradio::get_initial_sptr (new preamble_sync_impl());
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}
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/*
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* The private constructor
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*/
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preamble_sync_impl::preamble_sync_impl()
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: gr::block("preamble_sync", gr::io_signature::make(1, 1, sizeof(uint8_t)), gr::io_signature::make(1, 1, sizeof(uint8_t)))
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, m_state(Init)
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, m_stateNext(Init)
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, m_word(0)
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, m_wordCount(0)
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, m_preambleCount(0)
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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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preamble_sync_impl::~preamble_sync_impl()
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{
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}
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void preamble_sync_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
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{
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ninput_items_required[0] = 8*noutput_items;
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}
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int preamble_sync_impl::general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
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{
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size_t const word_size = 8;
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const uint8_t *in = (const uint8_t *) input_items[0];
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uint8_t *out = (uint8_t *) output_items[0];
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// Do <+signal processing+>
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size_t i = 0;
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size_t j = 0;
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for (i=0; i < ninput_items[0]; i++)
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{
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if (in[i] == 0xFF)
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{
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if (m_state != Init)
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{
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m_state = Init;
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fprintf(stderr, "Init\n");
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}
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continue;
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}
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m_word = (m_word << 1) | in[i];
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if (m_wordCount != 0)
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{
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m_wordCount--;
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continue;
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}
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m_word &= (typeof(m_word))(1 << word_size)-1;
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m_stateNext = m_state;
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switch (m_state)
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{
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case Init:
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if (m_word != 0xCC)
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{
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m_wordCount = 0;
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m_preambleCount = 8;
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}
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else
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{
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m_wordCount = word_size-1;
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if (m_preambleCount)
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{
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m_preambleCount--;
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}
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else
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{
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m_stateNext = Preamble;
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fprintf(stderr, "Preamble\n");
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}
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}
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break;
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case Preamble:
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m_wordCount = word_size-1;
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if (m_word == 0xC0)
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{
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m_stateNext = Sync;
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fprintf(stderr, "Sync 1\n");
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}
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else if (m_word == 0xCF)
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{
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m_stateNext = Sync;
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fprintf(stderr, "Sync 2\n");
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}
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else if (m_word == 0xF0)
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{
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m_wordCount = word_size/2-1;
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m_stateNext = Sync;
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fprintf(stderr, "Sync 3\n");
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}
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else if (m_word != 0xCC)
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{
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m_wordCount = 0;
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m_stateNext = Init;
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}
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break;
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case Sync:
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m_wordCount = word_size-1;
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out[j++] = m_word;
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break;
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}
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m_state = m_stateNext;
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}
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// Tell runtime system how many input items we consumed on
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// each input stream.
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consume_each (i);
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// Tell runtime system how many output items we produced.
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return j;
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}
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} /* namespace jay */
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} /* namespace gr */
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