How to update the program by USB DFU bootloader in system flash?

[Junde]

Hi there,

I am verifying the USB DFU bootloader in STM32F429BI.

I can normally enter the bootloader and connect my MCU using stm32CubeProg.

I can succeed in the program flash when I check the "Full Chip erase" option, otherwise, it will fail sometimes(see the LOG in the attachment)!

But if "Full Chip erase", it needs a bit long time. Can I erase the sector when needed only?

One more, each time I flash the program, I must reset the MCU by hand, can I set the MCU to auto-reset after download?

Thanks for your help.

 

My code as below:

#define BOOTLOADER_ADDRESS					(0x1FFF0000)
#define BOOTLOADER_FLAG_VALUE 			0xDEADBEEF
#define BOOTLOADER_FLAG_OFFSET 			0x50

typedef void (*pFunction)(void);
uint32_t endstack = 0x20030000;
uint32_t *bootloader_flag;
uint32_t JumpAddress;
pFunction JumpToBootLoader;

int main(void)
{
 bootloader_flag = (uint32_t*)(endstack - BOOTLOADER_FLAG_OFFSET);
 if(*bootloader_flag == BOOTLOADER_FLAG_VALUE) {
 *bootloader_flag = 0;
 __HAL_SYSCFG_REMAPMEMORY_SYSTEMFLASH();
 JumpAddress = *(__IO uint32_t*)(BOOTLOADER_ADDRESS + 4);
 JumpToBootLoader = (pFunction)JumpAddress;
 __set_MSP(*(__IO uint32_t*)BOOTLOADER_ADDRESS);
 JumpToBootLoader();
 } else {
 *bootloader_flag = 0x1234ABCD;
 }

 HAL_Init();
 SystemClock_Config();

 LOG_INIT();
 LOG_DBG("\n\nSTM32V6 USB DFU BootLoader test flag[0x%08x]...\n", *bootloader_flag);

 MX_GPIO_Init();
 MX_USART1_UART_Init();
 HAL_UART_Transmit(&huart1, (uint8_t*)"send 0x5A to update...\r\n", strlen("send 0x5A to update...\r\n"), 100);

 uint8_t rxBuf[10];
 while (1)
 {
 HAL_Delay(1000);
 LOG_DBG("DELAY 1s\n"); // hex1
 //LOG_DBG("delay 1s\n"); // hex2

 HAL_UART_Receive(&huart1, rxBuf, 1, 20);
 if(rxBuf[0] == 0x5A) {
 *bootloader_flag = BOOTLOADER_FLAG_VALUE;
 LOG_DBG("Jump to BootLoader, flag[0x%08x]...\n", *bootloader_flag);
 HAL_Delay(100);
 __disable_irq(); 
 HAL_NVIC_SystemReset();
 }
 }
}

[Junde]

I have generated "hex1" and "hex2" for testing. (The difference at line 39-40)

When I check the "Full Chip erase", both "hex1" to "hex2" and "hex2" to "hex1" are OK;

But when I don't check the "Full Chip erase", only "hex2" to "hex1" is successful, and "hex1" to "hex2" failed. (This means "delay to DELAY" failed, "DELAY to delay" successed)

[Junde]

I am trying to connect the bootloader by UART in stm32cubeProg, but it failed... The steps are as follows:

    1. pull boot0 high;

    2. click the connect button in stm32cubeProg;

    3. reset the MCU, then some error message in the attachment;

          

 

I can enter the UART bootloader by serial assistant as following steps:

    1. open the serial assistant and keep sending 0x7F;

    2. pull boot0 high;

    3. reset the MCU;

    4. the serial assistant can receive 0x79 0x1F 0x1F....