实验现象及操作说明：
1、本例程共有两个代码包，APP和IAP，IAP程序功能实现将APP程序升级至STM32中。
2、直接上电或烧写程序将执行升级的APP应用程序。
3、按下按键上电或写程序将进行升级，升级文件.bin文件存入在SD卡中
BIN升级文件产生方法：
1、编译APP工程，产生.hex文件。
2、将.hex文件拖至HEX2BIN.EXE即可产生.bin文件。
核心代码：
int main(void){ /* USER CODE BEGIN 1 */ int k; int cnt; unsigned int counter; unsigned long int ncounter = 0; unsigned char buffer[1024]; FIL fil; static FRESULT res; unsigned long int *p; /* USER CODE END 1 */ /* MCU Configuration----------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); /* USER CODE BEGIN 2 */ if(ARM_KEY_STATE == KEY_UP){ goto start; } LED_BLUE_ON; //SD¿¨³õʼ»¯ if(BSP_SD_Init() != MSD_OK){ led_trade(); } //½âËøÄÚ´æ,²Á³ýÉÈÇø HAL_FLASH_Unlock(); for(cnt = FLASH_SECTOR_2;cnt < FLASH_SECTOR_11;cnt ++){ FLASH_Erase_Sector(cnt,OB_BOR_LEVEL3); } LED_BLUE_OFF; LED_RED_ON; //f_mount res = f_mount(&fatfs,"0:",1); //¸ø´ÅÅÌ·ÖÅäÅÌ·û if(res != RES_OK){ LED_RED_OFF; led_trade(); } //f_open res = f_open(&fil,"0:/app.bin",FA_READ); //´ò¿ªapp.binÎļþ if(res != RES_OK){ LED_RED_OFF; led_trade(); } //f_lseek res = f_lseek(&fil,0); //½«Ö¸ÕëÒƶ¯µ½µÚÒ»¸öλÖà if(res != RES_OK){ LED_RED_OFF; led_trade(); } //дFlash while(ncounter < fil.fsize) { res = f_read(&fil,buffer,1024,&counter); //¶ÁÎļþ if(res != RES_OK){ LED_RED_OFF; led_trade(); } p = (unsigned long int *)buffer; for(k = 0; k < counter / 4; k++) { HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,APPLICATION_ADDRESS + ncounter,*(p + k)); ncounter += 4; } } HAL_FLASH_Lock(); //ARM¸üÐÂÉý¼¶³É¹¦£¬ÂÌÉ«LEDµÆµãÁÁ LED_BLUE_OFF; LED_RED_OFF; LED_GREEN_ON; /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } start: //²âÊÔÓû§´úÂëÊÇ·ñ´ÓAPPLICATION_ADDRESS±»±à³Ì if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) == 0x20000000){ //ÌøתÖÁÓû§³ÌÐò JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4); Jump_To_Application = (pFunction) JumpAddress; //³õʼ»¯Óû§³ÌÐòµÄ¶ÑÕ»Ö¸Õë __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS); //ÌøתÖÁÓ¦ÓóÌÐò Jump_To_Application(); }else{ led_trade(); } /* USER CODE END 3 */} 源代码下载链接：
链接： 密码：1k74
iCore4链接：