UA1ZBE Custom Firmware v1.0

Features:
- VFO mode with direct frequency input
- POCSAG decoder (512/1200 baud) with BCH(31,21) correction
- Full-screen Spectrum analyzer
- FM Radio receiver
- RSSI signal indicator overlay
- Custom boot splash (UA1ZBE / POCSAG pager / build date)

Architecture:
- app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM)
- app/boot_splash.c — 2-second boot splash
- app/pocsag/ — POCSAG decoder + BCH correction
- app/display_rssi.c — RSSI indicator
- main.c — entry point with custom init
- syscalls.c — bare-metal _sbrk stub

Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra
Size: 57.9KB Flash / 3.6KB RAM

Controls:
- 0-9: Direct frequency input (VFO)
- SK2: POCSAG mode
- SK1: Spectrum analyzer
- 0: FM Radio
- EXIT: Return to VFO
- F/*: Toggle 512/1200 baud (in POCSAG)

external/CMSIS_5/CMSIS/RTOS/Template/CPP/Semaphore.cpp

@@ -0,0 +1,24 @@
+#include "Semaphore.h"
+
+#include <string.h>
+//#include "error.h"
+
+namespace rtos {
+
+Semaphore::Semaphore(int32_t count) {
+#ifdef CMSIS_OS_RTX
+    memset(_semaphore_data, 0, sizeof(_semaphore_data));
+    _osSemaphoreDef.semaphore = _semaphore_data;
+#endif
+    _osSemaphoreId = osSemaphoreCreate(&_osSemaphoreDef, count);
+}
+
+int32_t Semaphore::wait(uint32_t millisec) {
+    return osSemaphoreWait(_osSemaphoreId, millisec);
+}
+
+osStatus Semaphore::release(void) {
+    return osSemaphoreRelease(_osSemaphoreId);
+}
+
+}