mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-14 20:18:13 +00:00
94 lines
3.8 KiB
C++
94 lines
3.8 KiB
C++
/*
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* Copyright (C) 2015 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_subghzd.hpp"
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#include "portapack_shared_memory.hpp"
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#include "event_m4.hpp"
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void SubGhzDProcessor::execute(const buffer_c8_t& buffer) {
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if (!configured) return;
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// SR = 4Mhz , and we are decimating by /8 in total , decim1_out clock 4Mhz /8= 500khz samples/sec.
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// buffer has 2048 complex i8 I,Q signed samples
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// decim0 out: 2048/4 = 512 complex i16 I,Q signed samples
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// decim1 out: 512/2 = 256 complex i16 I,Q signed samples
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// Regarding Filters, we are re-using existing FIR filters, @4Mhz, FIR decim1 ilter, BW =+-220Khz (at -3dB's). BW = 440kHZ.
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const auto decim_0_out = decim_0.execute(buffer, dst_buffer); // Input:2048 complex/4 (decim factor) = 512_output complex (1024 I/Q samples)
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const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer); // Input:512 complex/2 (decim factor) = 256_output complex ( 512 I/Q samples)
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for (size_t i = 0; i < decim_1_out.count; i++) {
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int16_t re = decim_1_out.p[i].real();
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int16_t im = decim_1_out.p[i].imag();
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uint32_t mag = ((uint32_t)re * (uint32_t)re) + ((uint32_t)im * (uint32_t)im);
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mag = (mag >> 12); // Decim samples are calculated with saturated gain . (we could also reduce that sat. param at configure time)
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bool meashl = (mag > threshold);
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tm += mag;
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if (meashl == currentHiLow && currentDuration < 30'000'000) // allow pass 'end' signal
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{
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currentDuration += nsPerDecSamp;
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} else { // called on change, so send the last duration and dir.
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if (protoList) protoList->feed(currentHiLow, currentDuration / 1000);
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currentDuration = nsPerDecSamp;
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currentHiLow = meashl;
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}
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}
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cnt += decim_1_out.count; // TODO , check if it is necessary that xdecim factor.
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if (cnt > 90'000) {
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threshold = (tm / cnt) / 2;
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cnt = 0;
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tm = 0;
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if (threshold < 50) threshold = 50;
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if (threshold > 1700) threshold = 1700;
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}
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}
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void SubGhzDProcessor::on_message(const Message* const message) {
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if (message->id == Message::ID::SubGhzFPRxConfigure)
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configure(*reinterpret_cast<const SubGhzFPRxConfigureMessage*>(message));
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}
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void SubGhzDProcessor::configure(const SubGhzFPRxConfigureMessage& message) {
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// constexpr size_t decim_0_output_fs = baseband_fs / decim_0.decimation_factor; //unused
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// constexpr size_t decim_1_output_fs = decim_0_output_fs / decim_1.decimation_factor; //unused
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modulation = message.modulation; // TODO: add support for FM (currently AM only)
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baseband_fs = message.sampling_rate;
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baseband_thread.set_sampling_rate(baseband_fs);
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nsPerDecSamp = 1'000'000'000 / baseband_fs * 8; // Scaled it due to less array buffer sampes due to /8 decimation. 250 nseg (4Mhz) * 8
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decim_0.configure(taps_200k_wfm_decim_0.taps);
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decim_1.configure(taps_200k_wfm_decim_1.taps);
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configured = true;
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}
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int main() {
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EventDispatcher event_dispatcher{std::make_unique<SubGhzDProcessor>()};
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event_dispatcher.run();
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return 0;
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}
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