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/RTOS2/RTX/Template/MemPool.c

@@ -0,0 +1,62 @@
+#include "cmsis_os2.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;
+ 
+osMemoryPoolId_t mpid_MemPool;                  // memory pool id
+ 
+osThreadId_t tid_Thread_MemPool;                // thread id
+ 
+void Thread_MemPool (void *argument);           // thread function
+ 
+int Init_MemPool (void) {
+ 
+  mpid_MemPool = osMemoryPoolNew(MEMPOOL_OBJECTS, sizeof(MEM_BLOCK_t), NULL);
+  if (mpid_MemPool == NULL) {
+    ; // MemPool object not created, handle failure
+  }
+ 
+  tid_Thread_MemPool = osThreadNew(Thread_MemPool, NULL, NULL);
+  if (tid_Thread_MemPool == NULL) {
+    return(-1);
+  }
+ 
+  return(0);
+}
+ 
+void Thread_MemPool (void *argument) {
+  MEM_BLOCK_t *pMem;
+  osStatus_t status;
+ 
+  while (1) {
+    ; // Insert thread code here...
+ 
+    pMem = (MEM_BLOCK_t *)osMemoryPoolAlloc(mpid_MemPool, 0U);  // get Mem Block
+    if (pMem != NULL) {                                         // Mem Block was available
+      pMem->Buf[0] = 0x55U;                                     // do some work...
+      pMem->Idx    = 0U;
+ 
+      status = osMemoryPoolFree(mpid_MemPool, pMem);            // free mem block
+      switch (status)  {
+        case osOK:
+          break;
+        case osErrorParameter:
+          break;
+        case osErrorNoMemory:
+          break;
+        default:
+          break;
+      }
+    }
+ 
+    osThreadYield();                                            // suspend thread
+  }
+}