portapack-mayhem/firmware/baseband/proc_sonde.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 Furrtek
*
* This file is part of PortaPack.
*
* 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
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_sonde.hpp"
#include "dsp_fir_taps.hpp"
#include "event_m4.hpp"
#include "audio_output.hpp"
SondeProcessor::SondeProcessor() {
decim_0.configure(taps_11k0_decim_0.taps);
decim_1.configure(taps_11k0_decim_1.taps);
audio_output.configure(false);
tone_gen.configure(BEEP_BASE_FREQ, 1.0, ToneGen::tone_type::sine, AUDIO_SAMPLE_RATE);
baseband_thread.start();
}
void SondeProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto decimator_out = decim_1_out;
/* 38.4kHz, 32 samples */
feed_channel_stats(decimator_out);
for (size_t i = 0; i < decimator_out.count; i++) {
if (mf.execute_once(decimator_out.p[i])) {
clock_recovery_fsk_9600(mf.get_output());
clock_recovery_fsk_4800(mf.get_output());
}
}
if (pitch_rssi_enabled) {
if (beep_play) {
// if we let the buffer underrun, for some reason
// once it starts looping it ignores zero (silence)
// samples, so we need to keep feeding the buffer
// and not be able to take advantage of the circular
// buffer loop:
// beep_play = false;
generate_beep();
}
if (silence_play) {
// silence_play = false;
generate_silence();
}
}
}
void SondeProcessor::on_message(const Message* const msg) {
switch (msg->id) {
case Message::ID::RequestSignal:
if ((*reinterpret_cast<const RequestSignalMessage*>(msg)).signal == RequestSignalMessage::Signal::BeepRequest) {
float rssi_ratio = (float)last_rssi / (float)RSSI_CEILING;
int beep_duration = 0;
if (rssi_ratio <= PROPORTIONAL_BEEP_THRES) {
beep_duration = BEEP_MIN_DURATION;
} else if (rssi_ratio < 1) {
beep_duration = (int)rssi_ratio * BEEP_DURATION_RANGE + BEEP_MIN_DURATION;
} else {
beep_duration = BEEP_DURATION_RANGE + BEEP_MIN_DURATION;
}
play_beep();
chThdSleepMilliseconds(beep_duration);
stop_beep();
}
break;
case Message::ID::PitchRSSIConfigure:
pitch_rssi_config(*reinterpret_cast<const PitchRSSIConfigureMessage*>(msg));
break;
default:
break;
}
}
void SondeProcessor::play_beep() {
beep_play = true;
silence_play = false;
}
void SondeProcessor::stop_beep() {
beep_play = false;
silence_play = true;
}
void SondeProcessor::generate_beep() {
// here we let the samples be created using the ToneGen class:
for (uint8_t i = 0; i < sizeof(audio_buffer.p); i++) {
audio_buffer.p[i] = (int16_t)((tone_gen.process(0) >> 16) & 0x0000FFFF);
}
audio_output.write(audio_buffer);
}
void SondeProcessor::generate_silence() {
for (uint8_t i = 0; i < sizeof(audio_buffer.p); i++) {
audio_buffer.p[i] = 0;
}
audio_output.write(audio_buffer);
}
void SondeProcessor::pitch_rssi_config(const PitchRSSIConfigureMessage& message) {
pitch_rssi_enabled = message.enabled;
uint32_t freq = (int)((float)message.rssi * (float)RSSI_PITCH_WEIGHT + (float)BEEP_BASE_FREQ);
last_rssi = message.rssi;
tone_gen.configure(freq, 1.0, ToneGen::tone_type::sine, AUDIO_SAMPLE_RATE);
}
int main() {
EventDispatcher event_dispatcher{std::make_unique<SondeProcessor>()};
event_dispatcher.run();
return 0;
}