mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2026-07-26 10:38:52 +00:00
Totoo
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/*
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* Copyright (C) 2026 HTotoo
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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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#ifndef __PROC_RTTY_RX_H__
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#define __PROC_RTTY_RX_H__
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#include "baseband_processor.hpp"
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#include "baseband_thread.hpp"
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#include "rssi_thread.hpp"
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#include "message.hpp"
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#include "dsp_decimate.hpp"
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#include "dsp_demodulate.hpp"
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#include "audio_output.hpp"
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#include "dsp_fir_taps.hpp"
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class RTTYRxProcessor : public BasebandProcessor {
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public:
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void execute(const buffer_c8_t& buffer) override;
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void on_message(const Message* const message) override;
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private:
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static constexpr size_t baseband_fs = 3072000;
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// RTTY Config
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uint16_t baud_rate = 0; // 0 = Auto-detect
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uint16_t shift_hz = 170;
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bool configured = false;
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// DSP Rates
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// Stage 0: 3.072M / 8 = 384k
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// Stage 1: 384k / 8 = 48k
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// Stage 2: 48k / 2 = 24k (Audio/Demod)
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static constexpr uint32_t decim_0_out_fs = baseband_fs / 8;
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static constexpr uint32_t decim_1_out_fs = decim_0_out_fs / 8;
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static constexpr uint32_t final_fs = decim_1_out_fs / 2; // 24000 Hz
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// Tuning Constants
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static constexpr int32_t LPF_ALPHA_SHIFT = 2;
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static constexpr int32_t MIN_SHIFT_SPREAD = 400;
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// Decimation Chain
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dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0{};
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dsp::decimate::FIRC16xR16x32Decim8 decim_1{};
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dsp::decimate::FIRAndDecimateComplex channel_filter{};
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// Demodulator & Audio
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dsp::demodulate::FM demod{};
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AudioOutput audio_output{};
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// Buffers
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std::array<complex16_t, 512> dst_buffer_data{};
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const buffer_c16_t dst_buffer{dst_buffer_data.data(), dst_buffer_data.size()};
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std::array<int16_t, 32> audio_data{};
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const buffer_s16_t audio_buffer{audio_data.data(), audio_data.size()};
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// Output Message
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RTTYDataMessage tx_message{};
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// Demodulator State
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int32_t fm_val_smoothed = 0;
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// Tracker State
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int32_t val_max = 0;
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int32_t val_min = 0;
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uint8_t decay_timer = 0;
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// Auto-Baud State
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uint32_t pulse_measure_counter = 0;
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uint8_t last_bit_state = 0;
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uint32_t estimated_bit_width = 528; // ~45 baud @ 24k
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// UART State
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enum UartState {
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WAIT_START,
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CHECK_START,
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READ_BITS,
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WAIT_STOP
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};
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UartState uart_state = WAIT_START;
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uint32_t samples_per_bit = 528;
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uint32_t phase_counter = 0;
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uint8_t bit_counter = 0;
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uint8_t shift_reg = 0;
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uint8_t current_slicer_bit = 1;
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// Polarity
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bool inverted_polarity = true;
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uint32_t polarity_timer = 0;
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void configure();
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void process_demodulated_sample(int32_t sample);
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void update_baud_estimation(uint32_t pulse_width);
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void append_data(uint8_t raw_baudot_code);
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BasebandThread baseband_thread{baseband_fs, this, baseband::Direction::Receive};
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RSSIThread rssi_thread{};
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};
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#endif /*__PROC_RTTY_RX_H__*/ |