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/MsgQueue.c

@@ -0,0 +1,85 @@
+
+#include "cmsis_os.h"                                           // CMSIS RTOS header file
+
+/*----------------------------------------------------------------------------
+ *      Message Queue creation & usage
+ *---------------------------------------------------------------------------*/
+ 
+void Thread_MsgQueue1 (void const *argument);                   // thread function 1
+void Thread_MsgQueue2 (void const *argument);                   // thread function 2
+osThreadId tid_Thread_MsgQueue1;                                // thread id 1
+osThreadId tid_Thread_MsgQueue2;                                // thread id 2
+osThreadDef (Thread_MsgQueue1, osPriorityNormal, 1, 0);         // thread object 1
+osThreadDef (Thread_MsgQueue2, osPriorityNormal, 1, 0);         // thread object 2
+
+#define MSGQUEUE_OBJECTS      16                                // number of Message Queue Objects
+
+typedef struct {                                                // object data type
+  uint8_t Buf[32];
+  uint8_t Idx;
+} MEM_BLOCK_t;
+
+typedef struct {                                                // object data type
+  uint8_t Buf[32];
+  uint8_t Idx;
+} MSGQUEUE_OBJ_t;
+
+osPoolId mpid_MemPool2;                                         // memory pool id
+osPoolDef (MemPool2, MSGQUEUE_OBJECTS, MEM_BLOCK_t);            // memory pool object
+  
+osMessageQId mid_MsgQueue;                                      // message queue id
+osMessageQDef (MsgQueue, MSGQUEUE_OBJECTS, MSGQUEUE_OBJ_t);     // message queue object
+
+
+int Init_MsgQueue (void) {
+
+  mpid_MemPool2 = osPoolCreate (osPool (MemPool2));             // create Mem Pool
+  if (!mpid_MemPool2) {
+    ; // MemPool object not created, handle failure
+  }
+  
+  mid_MsgQueue = osMessageCreate (osMessageQ(MsgQueue), NULL);  // create msg queue
+  if (!mid_MsgQueue) {
+    ; // Message Queue object not created, handle failure
+  }
+  
+  tid_Thread_MsgQueue1 = osThreadCreate (osThread(Thread_MsgQueue1), NULL);
+  if (!tid_Thread_MsgQueue1) return(-1);
+  tid_Thread_MsgQueue2 = osThreadCreate (osThread(Thread_MsgQueue2), NULL);
+  if (!tid_Thread_MsgQueue2) return(-1);
+  
+  return(0);
+}
+
+void Thread_MsgQueue1 (void const *argument) {
+  MEM_BLOCK_t *pMsg = 0;
+
+  while (1) {
+    ; // Insert thread code here...
+    pMsg = (MEM_BLOCK_t *)osPoolCAlloc (mpid_MemPool2);         // get Mem Block
+    if (pMsg) {                                                 // Mem Block was available
+      pMsg->Buf[0] = 0x55;                                      // do some work...
+      pMsg->Idx    = 0;
+      osMessagePut (mid_MsgQueue, (uint32_t)pMsg, osWaitForever); // Send Message
+    }
+
+    osThreadYield ();                                           // suspend thread
+  }
+}
+
+void Thread_MsgQueue2 (void const *argument) {
+  osEvent      evt;
+  MEM_BLOCK_t *pMsg = 0;
+
+  while (1) {
+    ; // Insert thread code here...
+    evt = osMessageGet (mid_MsgQueue, osWaitForever);           // wait for message
+    if (evt.status == osEventMessage) {
+      pMsg = evt.value.p;
+      if (pMsg) {
+        ; // process data
+        osPoolFree (mpid_MemPool2, pMsg);                       // free memory allocated for message
+      }
+    }
+  }
+}