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/os_sample1.c

@@ -0,0 +1,34 @@
+/* ----------------------------------------------------------------------  
+ * Copyright (C) 2011 ARM Limited. All rights reserved.  
+ *  
+ * $Date:        30. November 2011
+ * $Revision:    V0.02
+ *  
+ * Project: 	    CMSIS-RTOS API
+ * Title:	    os_sample1.c
+ *  
+ * Description:	This file shows the usage of the CMSIS-RTOS API.
+ *  
+ * Version 0.02
+ *    Initial Proposal Phase 
+ * -------------------------------------------------------------------- */ 
+
+
+#define osObjectsExternal
+#include "my_objects.h"              // Reference CMSIS OS Objects
+
+
+void thread_sample (void const *argument)  {
+  osThreadId my_thread;
+  osPriority my_priority;
+  int i = 1000;
+
+  my_thread = osThreadGetId();
+  my_priority = osThreadGetPriority (my_thread);  // Get priority of own thread
+  while (i > 0)  {
+    osThreadSetPriority (my_thread, osPriorityAboveNormal);
+    i--;
+  }
+  osThreadSetPriority (my_thread, my_priority);
+  osThreadTerminate (my_thread);                  // terminate own thread
+}