portapack-mayhem/firmware/baseband/proc_afsk.cpp

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/*
* Copyright (C) 2014 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_afsk.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void AFSKProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 2280000/2048 = 1113Hz
if (!configured) return;
for (size_t i = 0; i<buffer.count; i++) {
// Tone generation at 2280000/10 = 228kHz
if (s >= (10 - 1)) {
s = 0;
if (sample_count >= afsk_samples_per_bit) {
if (configured == true) {
cur_byte = message_data[byte_pos];
ext_byte = message_data[byte_pos + 1];
if (!cur_byte) {
if (repeat_counter < afsk_repeat) {
bit_pos = 0;
byte_pos = 0;
cur_byte = message_data[0];
ext_byte = message_data[1];
message.n = repeat_counter + 1;
shared_memory.application_queue.push(message);
repeat_counter++;
} else {
message.n = 0;
shared_memory.application_queue.push(message);
cur_byte = 0;
ext_byte = 0;
configured = false;
}
}
}
if (afsk_alt_format) {
// 0bbbbbbbbp
// Start, 8-bit data, parity
gbyte = 0;
gbyte = cur_byte << 1;
gbyte |= (ext_byte & 1);
} else {
// 0bbbbbbbp1
// Start, 7-bit data, parity, stop
gbyte = 0;
gbyte = cur_byte << 1;
gbyte |= 1;
}
cur_bit = (gbyte >> (9 - bit_pos)) & 1;
if (bit_pos == 9) {
bit_pos = 0;
if (!afsk_alt_format)
byte_pos++;
else
byte_pos += 2;
} else {
bit_pos++;
}
sample_count = 0;
} else {
sample_count++;
}
if (cur_bit)
tone_phase += afsk_phase_inc_mark;
else
tone_phase += afsk_phase_inc_space;
} else {
s++;
}
tone_sample = (sine_table_i8[(tone_phase & 0x03FC0000)>>18]);
// FM
// 1<<18 = 262144
// m = (262144 * BW) / 2280000 (* 115, see ui_lcr afsk_bw setting)
frq = tone_sample * afsk_bw;
phase = (phase + frq);
sphase = phase + (64<<18);
re = (sine_table_i8[(sphase & 0x03FC0000)>>18]);
im = (sine_table_i8[(phase & 0x03FC0000)>>18]);
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
}
void AFSKProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const AFSKConfigureMessage*>(p);
if (message.id == Message::ID::AFSKConfigure) {
memcpy(message_data, message.message_data, 256);
afsk_samples_per_bit = message.afsk_samples_per_bit;
afsk_phase_inc_mark = message.afsk_phase_inc_mark;
afsk_phase_inc_space = message.afsk_phase_inc_space;
afsk_repeat = message.afsk_repeat - 1;
afsk_bw = message.afsk_bw;
afsk_alt_format = message.afsk_alt_format;
repeat_counter = 0;
bit_pos = 0;
byte_pos = 0;
cur_byte = 0;
ext_byte = 0;
cur_bit = 0;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AFSKProcessor>() };
event_dispatcher.run();
return 0;
}