Rtty tx and rx (#2977)

2026-08-20 06:29:02 +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 +1,104 @@
+#include "baudot.hpp"
+#include <cctype>
+
+namespace ui::external_app::rtty_tx {
+
+constexpr uint8_t CODE_FIGS = 0x1B;
+constexpr uint8_t CODE_LTRS = 0x1F;
+constexpr uint8_t CODE_SPACE = 0x04;
+
+char BaudotCoder::get_char_mapping(bool is_figures, uint8_t index) const {
+    if (index >= 32) return 0;  // Safety check
+
+    if (is_figures) {
+        // ITA2 FIGURES Table
+        const char figures[32] = {
+            0, '3', '\n', '-', ' ', '\'', '8', '7',
+            '\r', '$', '4', '\a', ',', '!', ':', '(',
+            '5', '+', ')', '2', '#', '6', '0', '1',
+            '9', '?', '&', 0, '.', '/', '=', 0};
+        return figures[index];
+    } else {
+        // ITA2 LETTERS Table
+        const char letters[32] = {
+            0, 'E', '\n', 'A', ' ', 'S', 'I', 'U',
+            '\r', 'D', 'R', 'J', 'N', 'F', 'C', 'K',
+            'T', 'Z', 'L', 'W', 'H', 'Y', 'P', 'Q',
+            'O', 'B', 'G', 0, 'M', 'X', 'V', 0};
+        return letters[index];
+    }
+}
+
+// --- DECODE ---
+char BaudotCoder::decode(uint8_t baudotCode) {
+    uint8_t code = baudotCode & 0x1F;
+    if (code == CODE_FIGS) {
+        shiftState = FIGURES;
+        return 0;
+    }
+    if (code == CODE_LTRS) {
+        shiftState = LETTERS;
+        return 0;
+    }
+    if (usos_enabled && shiftState == FIGURES && code == CODE_SPACE) {
+        shiftState = LETTERS;
+        return ' ';
+    }
+    return get_char_mapping((shiftState == FIGURES), code);
+}
+
+void BaudotCoder::encode(const std::string& src, uint8_t* dest, uint16_t* dest_length, uint16_t dest_max_size) {
+    uint16_t idx = 0;
+
+    for (char c : src) {
+        if (idx >= dest_max_size) break;
+
+        char upper_c = std::toupper(c);
+        uint8_t code = 0;
+        bool found = false;
+        bool target_is_figures = false;
+        if (upper_c == ' ') {
+            code = CODE_SPACE;
+            found = true;
+        } else {
+            for (int i = 1; i < 32; i++) {
+                if (get_char_mapping(false, i) == upper_c) {
+                    code = i;
+                    found = true;
+                    target_is_figures = false;
+                    break;
+                }
+            }
+            if (!found) {
+                for (int i = 1; i < 32; i++) {
+                    if (get_char_mapping(true, i) == upper_c) {
+                        code = i;
+                        found = true;
+                        target_is_figures = true;
+                        break;
+                    }
+                }
+            }
+        }
+
+        if (found) {
+            if (target_is_figures && shiftState != FIGURES) {
+                if (idx + 1 >= dest_max_size) break;
+                dest[idx++] = CODE_FIGS;
+                shiftState = FIGURES;
+            } else if (!target_is_figures && shiftState != LETTERS && code != CODE_SPACE) {
+                if (idx + 1 >= dest_max_size) break;
+                dest[idx++] = CODE_LTRS;
+                shiftState = LETTERS;
+            }
+
+            dest[idx++] = code;
+        }
+    }
+
+    if (dest_length) {
+        *dest_length = idx;
+    }
+}
+
+}  // namespace ui::external_app::rtty_tx