commit for customized Makefile and build script. && Implemented a User_Main function call demo as a bridge to allow program execution to transition from main.c to C++ environment.

Core/Src/main.c

@@ -103,6 +103,9 @@ int main(void)
   MX_SPI1_Init();
   /* USER CODE BEGIN 2 */
 
+  // 跳转到自定义函数入口
+  User_Main();
+
   /* USER CODE END 2 */
 
   /* Call init function for freertos objects (in cmsis_os2.c) */