127 lines
3.6 KiB
C++
127 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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#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 "morse_decoder_impl.h"
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#include <satnogs/log.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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morse_decoder::sptr
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morse_decoder::make (char unrecognized_char, size_t min_frame_len)
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{
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return gnuradio::get_initial_sptr (
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new morse_decoder_impl (unrecognized_char, min_frame_len));
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}
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void
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morse_decoder_impl::symbol_msg_handler (pmt::pmt_t msg)
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{
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bool res = false;
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morse_symbol_t s;
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s = (morse_symbol_t) pmt::to_long (msg);
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switch (s)
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{
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case MORSE_DOT:
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case MORSE_DASH:
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case MORSE_S_SPACE:
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res = d_morse_tree.received_symbol (s);
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break;
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/*
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* If a word separator occurs it is a good time to retrieve the decoded
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* word
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*/
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case MORSE_L_SPACE:
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/*
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* Inject a character separator, for the morse decoder to commit
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* the outstanding character
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*/
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res = d_morse_tree.received_symbol (MORSE_S_SPACE);
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/* Just ignore the word separator if no word is yet decoded */
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if (d_morse_tree.get_word_len () == 0) {
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res = true;
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break;
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}
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d_str = d_str.append(d_morse_tree.get_word ());
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d_str = d_str.append(" ");
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d_morse_tree.reset ();
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break;
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case MORSE_INTRA_SPACE:
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/*Ignore it */
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break;
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case MORSE_END_MSG_SPACE:
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if (d_str.length () > d_min_frame_len) {
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d_morse_tree.reset ();
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message_port_pub (pmt::mp ("out"),
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pmt::make_blob (d_str.c_str (), d_str.length ()));
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d_str = "";
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}
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break;
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default:
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LOG_ERROR("Unknown Morse symbol");
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return;
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}
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/*
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* If the decoding return false, it means that either an non decode-able
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* character situation occurred or the maximum word limit reached
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*/
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if (!res) {
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if (d_morse_tree.get_max_word_len () == d_morse_tree.get_word_len ()) {
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d_str = d_morse_tree.get_word ();
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d_morse_tree.reset ();
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message_port_pub (pmt::mp ("out"),
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pmt::make_blob (d_str.c_str (), d_str.length ()));
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}
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}
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}
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/*
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* The private constructor
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*/
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morse_decoder_impl::morse_decoder_impl (char unrecognized_char,
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size_t min_frame_len) :
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gr::block ("morse_decoder", gr::io_signature::make (0, 0, 0),
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gr::io_signature::make (0, 0, 0)),
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d_morse_tree (unrecognized_char),
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d_min_frame_len (min_frame_len),
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d_str("")
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{
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/* Register the input and output msg handler */
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message_port_register_in (pmt::mp ("in"));
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message_port_register_out (pmt::mp ("out"));
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set_msg_handler (
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pmt::mp ("in"),
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boost::bind (&morse_decoder_impl::symbol_msg_handler, this, _1));
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}
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} /* namespace satnogs */
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} /* namespace gr */
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