portapack-mayhem/firmware/baseband/proc_mictx.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 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_mictx.hpp"
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#include "tonesets.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void MicTXProcessor::execute(const buffer_c8_t& buffer){
// This is called at 1536000/2048 = 750Hz
if (!configured) return;
audio_input.read_audio_buffer(audio_buffer);
for (size_t i = 0; i<buffer.count; i++) {
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if (!play_beep) {
sample = audio_buffer.p[i >> 6] >> 8; // 1536000 / 64 = 24000
sample = (sample * (int32_t)gain_x10) / 10;
power += (sample < 0) ? -sample : sample; // Power average for UI vu-meter
if (!as) {
as = divider;
level_message.value = power / (divider / 4); // Why ?
shared_memory.application_queue.push(level_message);
power = 0;
} else {
as--;
}
} else {
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if (beep_timer) {
beep_timer--;
} else {
beep_timer = 76800; // 50ms @ 1536000Hz
if (beep_index == BEEP_TONES_NB) {
configured = false;
fm_delta = 0; // Zero-out the IQ output for the rest of the buffer
shared_memory.application_queue.push(txprogress_message);
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} else {
beep_phase_inc = beep_deltas[beep_index];
beep_index++;
}
}
sample = sine_table_i8[(beep_phase & 0xFF000000U) >> 24];
beep_phase += beep_phase_inc;
}
if (ctcss_enabled) {
ctcss_sample = sine_table_i8[(ctcss_phase & 0xFF000000U) >> 24];
sample_mixed = ((sample * 205) + (ctcss_sample * 50)) / 256; // ~20%
ctcss_phase += ctcss_phase_inc;
} else {
sample_mixed = sample;
}
// FM
if (fm_delta) {
delta = sample_mixed * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
} else {
re = 0;
im = 0;
}
buffer.p[i] = {re, im};
}
}
void MicTXProcessor::on_message(const Message* const msg) {
const AudioTXConfigMessage config_message = *reinterpret_cast<const AudioTXConfigMessage*>(msg);
const RequestSignalMessage request_message = *reinterpret_cast<const RequestSignalMessage*>(msg);
switch(msg->id) {
case Message::ID::AudioTXConfig:
fm_delta = config_message.fm_delta * (0xFFFFFFULL / 1536000);
gain_x10 = config_message.gain_x10;
divider = config_message.divider;
ctcss_enabled = config_message.ctcss_enabled;
ctcss_phase_inc = config_message.ctcss_phase_inc;
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txprogress_message.done = true;
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play_beep = false;
configured = true;
break;
case Message::ID::RequestSignal:
if (request_message.signal == RequestSignalMessage::Signal::BeepRequest) {
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beep_index = 0;
beep_timer = 0;
play_beep = true;
}
break;
default:
break;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<MicTXProcessor>() };
event_dispatcher.run();
return 0;
}