Using RAM_D3 start as flag for system_bootloader

Core/Src/main.c

@@ -60,6 +60,7 @@
 
 /* Private variables ---------------------------------------------------------*/
 
+// define the magic number for the bootloader 8 bytes 
 /* USER CODE BEGIN PV */
 uint8_t gCLS_DEVICE_ADDRESS = 0x11;
 /* USER CODE END PV */
@@ -72,11 +73,13 @@ static void MPU_Config(void);
 void MX_FREERTOS_Init(void);
 /* USER CODE BEGIN PFP */
 void ULOG_SendLPUART(ulog_level_t level, char *msg);
+void JumpToBootloader_system(void);
 /* USER CODE END PFP */
 
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
-
+const uint32_t OS_BOOTFLAG_ADDRESS = 0x38000000;
+const uint32_t OS_BOOTFLAG_MAGIC = 0xDEADBEFF;
 /* USER CODE END 0 */
 
 /**
@@ -87,10 +90,24 @@ int main(void)
 {
   /* USER CODE BEGIN 1 */
 
+  // Check if the bootloader magic number is set at the given address
+  volatile uint32_t * ptr = (uint32_t *)OS_BOOTFLAG_ADDRESS;
+  if (*ptr == OS_BOOTFLAG_MAGIC) {
+    // Jump to the bootloader
+    *ptr = 0;
+    JumpToBootloader_system();
+  }
+
+  if (*ptr == 0) {
+    *ptr = 2;
+    NVIC_SystemReset();
+  }
+  
+
   /* USER CODE END 1 */
 
   /* Enable I-Cache---------------------------------------------------------*/
-  SCB_EnableICache();
+  //SCB_EnableICache();
 
   /* MCU Configuration--------------------------------------------------------*/
 
@@ -286,6 +303,17 @@ void ULOG_SendLPUART(ulog_level_t level, char *msg) {
 }
 
 void JumpToBootloader(void)
+{
+
+    // Set the magic number to the given address
+    volatile uint32_t * ptr = (uint32_t *)OS_BOOTFLAG_ADDRESS;
+    *ptr = OS_BOOTFLAG_MAGIC;
+
+
+    NVIC_SystemReset();
+}
+
+void JumpToBootloader_system(void)
 {
 #define conBootloadAddress 0x1FF09800