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/RTX/UserCodeTemplates/MemPool.c

@@ -0,0 +1,63 @@
+
+#include "cmsis_os.h"                                           // CMSIS RTOS header file
+
+/*----------------------------------------------------------------------------
+ *      Memory Pool creation & usage
+ *---------------------------------------------------------------------------*/
+ 
+#define MEMPOOL_OBJECTS      16                                 // number of Memory Pool Objects
+
+typedef struct {                                                // object data type
+  uint8_t Buf[32];
+  uint8_t Idx;
+} MEM_BLOCK_t;
+
+void Thread_MemPool (void const *argument);                     // thread function
+osThreadId tid_Thread_MemPool;                                  // thread id
+osThreadDef (Thread_MemPool, osPriorityNormal, 1, 0);           // thread object
+
+osPoolId mpid_MemPool;                                          // memory pool id
+osPoolDef (MemPool, MEMPOOL_OBJECTS, MEM_BLOCK_t);              // memory pool object
+
+
+int Init_MemPool (void) {
+
+  mpid_MemPool = osPoolCreate (osPool (MemPool));               // create Mem Pool
+  if (!mpid_MemPool) {
+    ; // MemPool object not created, handle failure
+  }
+  
+  tid_Thread_MemPool = osThreadCreate (osThread(Thread_MemPool), NULL);
+  if (!tid_Thread_MemPool) return(-1);
+  
+  return(0);
+}
+
+void Thread_MemPool (void const *argument) {
+  osStatus     status;
+  MEM_BLOCK_t *pMem = 0;
+
+  while (1) {
+    ; // Insert thread code here...
+
+    pMem = (MEM_BLOCK_t *)osPoolCAlloc (mpid_MemPool);          // get Mem Block
+    if (pMem) {                                                 // Mem Block was available
+      pMem->Buf[0] = 0x55;                                      // do some work...
+      pMem->Idx    = 0;      
+      
+      status = osPoolFree (mpid_MemPool, pMem);                 // free mem block
+      switch (status)  {
+        case osOK:
+          break;
+        case osErrorParameter:
+          break;
+        case osErrorValue:
+          break;
+        default:
+          break;
+      }
+    }
+
+    osThreadYield ();                                           // suspend thread
+  }
+}