Rtty tx and rx (#2977)

2026-09-11 09:09:29 +00:00 · 2026-02-16 14:34:55 +01:00
parent 95eafeb812
commit 794daf5257
21 changed files with 1809 additions and 1 deletions
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2026 HTotoo
+ *
+ * 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.
+ */
+
+#ifndef __PROC_RTTY_TX_H__
+#define __PROC_RTTY_TX_H__
+
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+#include "portapack_shared_memory.hpp"
+#include <array>
+
+class RTTYTXProcessor : public BasebandProcessor {
+   public:
+    void execute(const buffer_c8_t& buffer) override;
+    void on_message(const Message* const msg) override;
+
+   private:
+    static constexpr uint32_t baseband_fs = 2048000;
+
+    bool configured{false};
+
+    // RTTY Configuration
+    uint32_t samples_per_bit{0};
+
+    // Stop bits configuration: 2=1.0, 3=1.5, 4=2.0
+    uint8_t configured_stop_bits{2};
+
+    // FSK State
+    uint32_t delta_mark{0};     // Phase step for Mark
+    uint32_t delta_space{0};    // Phase step for Space
+    uint32_t current_delta{0};  // Smoothed delta
+    uint32_t slew_rate{0};      // Max change per sample
+    uint32_t phase{0};          // Phase accumulator
+
+    // Precision Timing
+    uint32_t baud_phase{0};
+    uint32_t baud_phase_increment{0};
+    uint32_t base_baud_phase_increment{0};  // Store the standard 1.0 bit rate
+
+    // State Machine
+    enum class State {
+        Idle,
+        LeadIn,
+        StartBit,
+        DataBits,
+        StopBit,
+        LeadOut
+    };
+    State state{State::Idle};
+
+    uint32_t lead_counter{0};
+    uint8_t current_char{0};
+    uint8_t bit_pos{0};
+
+    // Ring Buffer
+    std::array<uint8_t, 1024> data_buffer{};
+    volatile size_t head{0};
+    volatile size_t tail{0};
+
+    void configure(uint16_t baud, uint16_t shift, int16_t mark_tone_, int16_t space_tone_, uint8_t stop_bits_, bool inverted_);
+    void advance_state();
+
+    bool buffer_push(uint8_t byte);
+    bool buffer_pop(uint8_t& byte);
+    bool buffer_empty() const;
+
+    TXProgressMessage txprogress_message{};
+
+    BasebandThread baseband_thread{baseband_fs, this, baseband::Direction::Transmit};
+};
+
+#endif /* __PROC_RTTY_TX_H__ */