mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 11:44:31 +00:00
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
*
|
|
* 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_tpms.hpp"
|
|
|
|
#include "portapack_shared_memory.hpp"
|
|
|
|
#include "dsp_fir_taps.hpp"
|
|
|
|
// IFIR image-reject filter: fs=2457600, pass=100000, stop=407200, decim=4, fout=614400
|
|
static constexpr fir_taps_real<24> taps_200k_decim_0 = {
|
|
.pass_frequency_normalized = 100000.0f / 2457600.0f,
|
|
.stop_frequency_normalized = 407200.0f / 2457600.0f,
|
|
.taps = { {
|
|
90, 94, 4, -240, -570, -776, -563, 309,
|
|
1861, 3808, 5618, 6710, 6710, 5618, 3808, 1861,
|
|
309, -563, -776, -570, -240, 4, 94, 90,
|
|
} },
|
|
};
|
|
|
|
// IFIR prototype filter: fs=614400, pass=100000, stop=207200, decim=2, fout=307200
|
|
static constexpr fir_taps_real<16> taps_200k_decim_1 = {
|
|
.pass_frequency_normalized = 100000.0f / 614400.0f,
|
|
.stop_frequency_normalized = 207200.0f / 614400.0f,
|
|
.taps = { {
|
|
-132, -256, 545, 834, -1507, -2401, 4666, 14583,
|
|
14583, 4666, -2401, -1507, 834, 545, -256, -132,
|
|
} },
|
|
};
|
|
|
|
TPMSProcessor::TPMSProcessor() {
|
|
decim_0.configure(taps_200k_decim_0.taps, 33554432);
|
|
decim_1.configure(taps_200k_decim_1.taps, 131072);
|
|
}
|
|
|
|
void TPMSProcessor::execute(const buffer_c8_t& buffer) {
|
|
/* 2.4576MHz, 2048 samples */
|
|
|
|
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
|
|
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
|
|
const auto decimator_out = decim_1_out;
|
|
|
|
/* 307.2kHz, 256 samples */
|
|
feed_channel_stats(decimator_out);
|
|
|
|
for(size_t i=0; i<decimator_out.count; i++) {
|
|
if( mf.execute_once(decimator_out.p[i]) ) {
|
|
clock_recovery(mf.get_output());
|
|
}
|
|
}
|
|
}
|
|
|
|
void TPMSProcessor::consume_symbol(
|
|
const float raw_symbol
|
|
) {
|
|
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
|
|
packet_builder.execute(sliced_symbol);
|
|
}
|
|
|
|
void TPMSProcessor::payload_handler(
|
|
const baseband::Packet& packet
|
|
) {
|
|
const TPMSPacketMessage message { packet };
|
|
shared_memory.application_queue.push(message);
|
|
}
|