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/Thread.cpp

@@ -0,0 +1,51 @@
+#include "Thread.h"
+
+namespace rtos {
+
+Thread::Thread(void (*task)(void const *argument),
+               void *argument,
+               osPriority priority,
+               uint32_t stacksize) {
+    // The actual fields of os_thread_def are implementation specific in every CMSIS-RTOS
+#ifdef CMSIS_OS_RTX
+    _thread_def.pthread = task;
+    _thread_def.tpriority = priority;
+    _thread_def.instances = 1;
+    _thread_def.stacksize = stacksize;
+#endif
+    _tid = osThreadCreate(&_thread_def, argument);
+}
+
+osStatus Thread::terminate() {
+    return osThreadTerminate(_tid);
+}
+
+osStatus Thread::set_priority(osPriority priority) {
+    return osThreadSetPriority(_tid, priority);
+}
+
+osPriority Thread::get_priority() {
+    return osThreadGetPriority(_tid);
+}
+
+int32_t Thread::signal_set(int32_t signals) {
+    return osSignalSet(_tid, signals);
+}
+
+osEvent Thread::signal_wait(int32_t signals, uint32_t millisec) {
+    return osSignalWait(signals, millisec);
+}
+
+osStatus Thread::wait(uint32_t millisec) {
+    return osDelay(millisec);
+}
+
+osStatus Thread::yield() {
+    return osThreadYield();
+}
+
+osThreadId Thread::gettid() {
+    return osThreadGetId();
+}
+
+}