mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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heurist1
318720f364
Left in the message for the moment, because there are likely to be parameters needed at some point.
113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
/*
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* Copyright (C) 1996 Thomas Sailer (sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu)
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* Copyright (C) 2012-2014 Elias Oenal (multimon-ng@eliasoenal.com)
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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; 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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#include "proc_pocsag.hpp"
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#include "event_m4.hpp"
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#include <cstdint>
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#include <cstddef>
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void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
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// This is called at 1500Hz
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if (!configured) return;
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// Get 24kHz audio
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
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const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
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const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer);
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auto audio = demod.execute(channel_out, audio_buffer);
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smooth.Process(audio.p, audio.count); // Smooth the data to make decoding more accurate
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audio_output.write(audio);
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processDemodulatedSamples(audio.p, 16);
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extractFrames();
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}
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// ====================================================================
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//
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// ====================================================================
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int POCSAGProcessor::OnDataWord(uint32_t word, int pos)
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{
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packet.set(pos, word);
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return 0;
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}
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// ====================================================================
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//
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// ====================================================================
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int POCSAGProcessor::OnDataFrame(int len, int baud)
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{
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if (len > 0)
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{
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packet.set_bitrate(baud);
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packet.set_flag(pocsag::PacketFlag::NORMAL);
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packet.set_timestamp(Timestamp::now());
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const POCSAGPacketMessage message(packet);
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shared_memory.application_queue.push(message);
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}
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return 0;
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}
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void POCSAGProcessor::on_message(const Message* const message) {
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if (message->id == Message::ID::POCSAGConfigure)
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configure(*reinterpret_cast<const POCSAGConfigureMessage*>(message));
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}
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void POCSAGProcessor::configure(const POCSAGConfigureMessage& message) {
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constexpr size_t decim_0_input_fs = baseband_fs;
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constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
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constexpr size_t decim_1_input_fs = decim_0_output_fs;
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constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
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constexpr size_t channel_filter_input_fs = decim_1_output_fs;
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const size_t channel_filter_output_fs = channel_filter_input_fs / 2;
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const size_t demod_input_fs = channel_filter_output_fs;
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decim_0.configure(taps_11k0_decim_0.taps, 33554432);
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decim_1.configure(taps_11k0_decim_1.taps, 131072);
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channel_filter.configure(taps_11k0_channel.taps, 2);
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demod.configure(demod_input_fs, 4500);
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// Smoothing should be roughly sample rate over max baud
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// 24k / 3.2k is 7.5
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smooth.SetSize(8);
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audio_output.configure(false);
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// Set up the frame extraction, limits of baud
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setFrameExtractParams(demod_input_fs, 4000, 300, 32);
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// Mark the class as ready to accept data
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configured = true;
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<POCSAGProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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