RT-4D: реверс прошивки, русификация, кастомный UI, флешеры

- Полный RE стока V3.25 (Cortex-M4F) + FM100B: карта памяти, протокол, codeplug, UI-архитектура
- Русификация: свой CP1251-шрифт + патч рендера, перевод меню и надписей, ребренд Ru-4D V3.25
- Блюпринт переделки UI + C-тулчейн (clang thumbv7em), доказан инъекцией
- Готовые флешеры: WebSerial .html и Windows .exe со вшитой прошивкой
- Дамп SPI рации, стоковая прошивка, инструменты сборки

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ui/my_ui.c

@@ -0,0 +1,47 @@
+/* RT-4D custom UI layer (Phase 1: custom standby/home screen).
+ * Compiled with clang --target=thumbv7em, linked at 0x08029000, injected over
+ * the russified stock image. Calls stock SDK functions by absolute address.
+ * Reads only RAM caches + calls display/ADC primitives -> codeplug & CPS untouched.
+ */
+typedef unsigned char  u8;
+typedef unsigned short u16;
+typedef unsigned int   u32;
+
+/* --- stock SDK (thumb entry = addr|1) --- */
+#define DRAW_STRING ((void (*)(u8 pg, u8 x, const void *s, u16 n, u8 mode))0x08008A51)
+#define STOCK_DRAW  ((void (*)(void))0x0801E1BD)          /* ui_draw_dispatch */
+
+/* --- RAM state --- */
+#define GSCR   (*(volatile u8 *)0x200008B3)               /* current screen id */
+#define GDISP  ((volatile u8 *)0x200009C3)                /* home display struct */
+
+/* draw one full-width (18-char) space-padded line from a source field.
+ * Full-coverage fixed-width paint => no clear needed, no flicker. */
+static void line_field(u8 pg, const volatile u8 *src, int n)
+{
+    char b[18];
+    int i;
+    for (i = 0; i < 18; i++) {
+        u8 c = (i < n) ? src[i] : 0x20;
+        if (c == 0 || c == 0xFF) c = 0x20;               /* pad -> space */
+        b[i] = (char)c;
+    }
+    DRAW_STRING(pg, 0, b, 18, 0);
+}
+
+static void my_home(void)
+{
+    line_field(0, GDISP + 0x00, 16);                     /* line 0: name / mode tag   */
+    line_field(2, GDISP + 0x20, 16);                     /* line 1: Area A freq/chan   */
+    line_field(4, GDISP + 0x32, 16);                     /* line 2: Area B            */
+    line_field(6, GDISP + 0x15, 7);                      /* line 3: CH-/A-/D- prefix   */
+}
+
+/* hooked in at the ui_tick_normal draw dispatch (bl @0x080207E6). */
+void my_draw_router(void)
+{
+    if (GSCR == 0)
+        my_home();                                       /* our custom home screen */
+    else
+        STOCK_DRAW();                                    /* stock draws all other screens */
+}