mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-09-20 16:15:51 +00:00
116 lines
2.7 KiB
C++
116 lines
2.7 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_adsbtx.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 ADSBTXProcessor::execute(const buffer_c8_t& buffer) {
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// This is called at 4M/2048 = 1953Hz
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// One pulse = 500ns = 2 samples
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// One bit = 2 pulses = 1us = 4 samples
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if (!configured) return;
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for (size_t i = 0; i < buffer.count; i++) {
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if (active) {
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if (!sample) {
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sample = 3;
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if (preamble) {
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if (bit_pos >= 16) {
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preamble = false;
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bit_pos = 0;
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} else {
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cur_bit = (preamble_parts << bit_pos) >> 15;
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bit_pos++;
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}
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}
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if (!preamble) {
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if (bit_pos >= 112) {
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active = false; // Stop
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cur_bit = 0;
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} else {
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cur_bit = shared_memory.bb_data.data[bit_pos];
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bit_pos++;
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}
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}
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} else
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sample--;
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if (sample == 1)
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cur_bit ^= 1; // Invert
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} else {
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//cur_bit = 0;
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if (bit_pos == 8192) { // ?
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configured = false;
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message.done = true;
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shared_memory.application_queue.push(message);
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}
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bit_pos++;
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}
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delta = tone_sample * fm_delta;
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tone_sample += 128;
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if (cur_bit) {
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phase += delta;
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sphase = phase + (64 << 24);
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re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
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im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
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} else {
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re = 0;
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im = 0;
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}
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buffer.p[i] = {re, im};
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}
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}
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void ADSBTXProcessor::on_message(const Message* const p) {
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const auto message = *reinterpret_cast<const ADSBConfigureMessage*>(p);
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if (message.id == Message::ID::ADSBConfigure) {
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bit_pos = 0;
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sample = 0;
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cur_bit = 0;
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preamble = true;
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active = true;
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configured = true;
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fm_delta = 50000 * (0xFFFFFFULL / 4000000); // Fixed bw for now
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<ADSBTXProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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