mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-14 04:04:34 +00:00
146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
/*
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* Copyright (C) 2014 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_afsk.hpp"
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#include "portapack_shared_memory.hpp"
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#include "sine_table_int8.hpp"
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#include "event_m4.hpp"
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#include <cstdint>
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void AFSKProcessor::execute(const buffer_c8_t& buffer) {
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// This is called at 2280000/2048 = 1113Hz
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if (!configured) return;
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for (size_t i = 0; i<buffer.count; i++) {
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// Tone generation at 2280000/10 = 228kHz
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if (s >= (10 - 1)) {
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s = 0;
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if (sample_count >= afsk_samples_per_bit) {
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if (configured == true) {
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cur_byte = message_data[byte_pos];
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ext_byte = message_data[byte_pos + 1];
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if (!cur_byte) {
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if (repeat_counter < afsk_repeat) {
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bit_pos = 0;
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byte_pos = 0;
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cur_byte = message_data[0];
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ext_byte = message_data[1];
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message.n = repeat_counter + 1;
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shared_memory.application_queue.push(message);
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repeat_counter++;
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} else {
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message.n = 0;
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shared_memory.application_queue.push(message);
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cur_byte = 0;
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ext_byte = 0;
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configured = false;
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}
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}
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}
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if (afsk_alt_format) {
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// 0bbbbbbbbp
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// Start, 8-bit data, parity
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gbyte = 0;
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gbyte = cur_byte << 1;
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gbyte |= (ext_byte & 1);
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} else {
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// 0bbbbbbbp1
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// Start, 7-bit data, parity, stop
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gbyte = 0;
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gbyte = cur_byte << 1;
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gbyte |= 1;
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}
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cur_bit = (gbyte >> (9 - bit_pos)) & 1;
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if (bit_pos == 9) {
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bit_pos = 0;
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if (!afsk_alt_format)
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byte_pos++;
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else
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byte_pos += 2;
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} else {
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bit_pos++;
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}
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sample_count = 0;
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} else {
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sample_count++;
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}
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if (cur_bit)
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tone_phase += afsk_phase_inc_mark;
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else
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tone_phase += afsk_phase_inc_space;
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} else {
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s++;
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}
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tone_sample = (sine_table_i8[(tone_phase & 0x03FC0000)>>18]);
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// FM
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// 1<<18 = 262144
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// m = (262144 * BW) / 2280000 (* 115, see ui_lcr afsk_bw setting)
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frq = tone_sample * afsk_bw;
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phase = (phase + frq);
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sphase = phase + (64<<18);
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re = (sine_table_i8[(sphase & 0x03FC0000)>>18]);
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im = (sine_table_i8[(phase & 0x03FC0000)>>18]);
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buffer.p[i] = {(int8_t)re,(int8_t)im};
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}
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}
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void AFSKProcessor::on_message(const Message* const p) {
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const auto message = *reinterpret_cast<const AFSKConfigureMessage*>(p);
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if (message.id == Message::ID::AFSKConfigure) {
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memcpy(message_data, message.message_data, 256);
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afsk_samples_per_bit = message.afsk_samples_per_bit;
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afsk_phase_inc_mark = message.afsk_phase_inc_mark;
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afsk_phase_inc_space = message.afsk_phase_inc_space;
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afsk_repeat = message.afsk_repeat - 1;
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afsk_bw = message.afsk_bw;
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afsk_alt_format = message.afsk_alt_format;
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repeat_counter = 0;
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bit_pos = 0;
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byte_pos = 0;
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cur_byte = 0;
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ext_byte = 0;
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cur_bit = 0;
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configured = true;
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<AFSKProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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