mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 04:28:10 +00:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
|
|
* 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_rds.hpp"
|
|
#include "portapack_shared_memory.hpp"
|
|
#include "sine_table_int8.hpp"
|
|
#include "event_m4.hpp"
|
|
|
|
#include <cstdint>
|
|
|
|
void RDSProcessor::execute(const buffer_c8_t& buffer) {
|
|
for (size_t i = 0; i < buffer.count; i++) {
|
|
// Sample generation at 2.28M / 10 = 228kHz
|
|
if (s >= 9) {
|
|
s = 0;
|
|
if (sample_count >= SAMPLES_PER_BIT) {
|
|
if (bit_pos >= message_length) {
|
|
bit_pos = 0;
|
|
cur_output = 0;
|
|
}
|
|
|
|
cur_bit = (rdsdata[(bit_pos / 26) & 127] >> (25 - (bit_pos % 26))) & 1;
|
|
prev_output = cur_output;
|
|
cur_output = prev_output ^ cur_bit;
|
|
|
|
const int32_t* src = waveform_biphase;
|
|
int idx = in_sample_index;
|
|
|
|
for (int j = 0; j < FILTER_SIZE; j++) {
|
|
val = (*src++);
|
|
if (cur_output) val = -val;
|
|
sample_buffer[idx++] += val;
|
|
if (idx >= SAMPLE_BUFFER_SIZE) idx = 0;
|
|
}
|
|
|
|
in_sample_index += SAMPLES_PER_BIT;
|
|
if (in_sample_index >= SAMPLE_BUFFER_SIZE) in_sample_index -= SAMPLE_BUFFER_SIZE;
|
|
|
|
bit_pos++;
|
|
|
|
sample_count = 0;
|
|
}
|
|
|
|
sample = sample_buffer[out_sample_index];
|
|
sample_buffer[out_sample_index] = 0;
|
|
out_sample_index++;
|
|
if (out_sample_index >= SAMPLE_BUFFER_SIZE) out_sample_index = 0;
|
|
|
|
// AM @ 228k/4 = 57kHz
|
|
// 0, sample, 0, -sample...
|
|
switch (mphase & 3) {
|
|
case 0:
|
|
case 2:
|
|
sample = 0;
|
|
break;
|
|
case 1:
|
|
break;
|
|
case 3:
|
|
sample = -sample; // break;
|
|
}
|
|
mphase++;
|
|
|
|
sample_count++;
|
|
} else {
|
|
s++;
|
|
}
|
|
|
|
// FM
|
|
delta = (sample >> 16) * 386760; // ?
|
|
|
|
phase += delta;
|
|
sphase = phase + (64 << 18);
|
|
|
|
re = (sine_table_i8[(sphase & 0x03FF0000) >> 18]);
|
|
im = (sine_table_i8[(phase & 0x03FF0000) >> 18]);
|
|
|
|
buffer.p[i] = {re, im};
|
|
}
|
|
}
|
|
|
|
void RDSProcessor::on_message(const Message* const msg) {
|
|
if (msg->id == Message::ID::RDSConfigure) {
|
|
const auto message = *reinterpret_cast<const RDSConfigureMessage*>(msg);
|
|
rdsdata = (uint32_t*)shared_memory.bb_data.data;
|
|
message_length = message.length;
|
|
configured = true;
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
EventDispatcher event_dispatcher{std::make_unique<RDSProcessor>()};
|
|
event_dispatcher.run();
|
|
return 0;
|
|
}
|