通过引导程序跳转到系统bootloader中，通过USB下载程序。
一、新建工程
用STM32CubeMX生成工程，基本设置都一样，主要是需要对USB进行设定。
该处Parameter Settings部分保持默认即可。
修改参数配置
USBD_DFU_XFER_SIZE（每次传输的最大字节数）
USBD_DFU_APP_DEFAULT_ADD (Base Address 0x)（升级
程序的起始地址）：该值需要大于引导程序的大小，且是0x200的倍数。
程序所占flash的大小，可以去.map文件中查看
二、修改程序
修改usbd_dfu_if.c文件
/**
* @brief Memory initialization routine.
* @retval USBD_OK if operation is successful, MAL_FAIL else.
*/
uint16_t MEM_If_Init_FS(void)
{
/* USER CODE BEGIN 0 */
HAL_FLASH_Unlock();
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGERR);
return (USBD_OK);
/* USER CODE END 0 */
}
/**
* @brief De-Initializes Memory
* @retval USBD_OK if operation is successful, MAL_FAIL else
*/
uint16_t MEM_If_DeInit_FS(void)
{
/* USER CODE BEGIN 1 */
HAL_FLASH_Lock();
return (USBD_OK);
/* USER CODE END 1 */
}
关于flash的擦除，这里很重要，由于使用的是VG芯片，它的内部分为了两个BANK，进行擦除的时候要分别擦除，尝试过直接从0x08100000擦到起始地址，但是只能擦除一个BANK。
/**
* @brief Erase sector.
* @param Add: Address of sector to be erased.
* @retval 0 if operation is successful, MAL_FAIL else.
*/
uint16_t MEM_If_Erase_FS(uint32_t Add)
{
/* USER CODE BEGIN 2 */
uint32_t NbOFPages=0;
uint32_t PageError;
HAL_StatusTypeDef status;
FLASH_EraseInitTypeDef pEraseInit;
/* Unlock the Flash to enable the flash control register access *************/
MEM_If_Init_FS();
/* Get the sector where start the user flash area */
NbOFPages = (USBD_DFU_BANK1_END_ADD - USBD_DFU_APP_DEFAULT_ADD)/FLASH_PAGE_SIZE;
pEraseInit.TypeErase = FLASH_TYPEERASE_PAGES;
pEraseInit.PageAddress = USBD_DFU_APP_DEFAULT_ADD;
pEraseInit.NbPages = NbOFPages;
status = HAL_FLASHEx_Erase(&pEraseInit, &PageError);
if (status != HAL_OK)
{
/* Error occurred while page erase */
return USBD_FAIL;
}
//VG芯片的flash分为两个BANK，擦除时要分别进行擦除，否则BANK2会擦除失败，下载程序时会出现下载到BANK2时就报错的问题
NbOFPages = (USBD_DFU_BANK2_END_ADD - USBD_DFU_BANK1_END_ADD)/FLASH_PAGE_SIZE;
pEraseInit.TypeErase = FLASH_TYPEERASE_PAGES;
pEraseInit.PageAddress = USBD_DFU_BANK1_END_ADD;
pEraseInit.NbPages = NbOFPages;
status = HAL_FLASHEx_Erase(&pEraseInit, &PageError);
if (status != HAL_OK)
{
/* Error occurred while page erase */
return USBD_FAIL;
}
return (USBD_OK);
/* USER CODE END 2 */
}
/**
* @brief Memory write routine.
* @param src: Pointer to the source buffer. Address to be written to.
* @param dest: Pointer to the destination buffer.
* @param Len: Number of data to be written (in bytes).
* @retval USBD_OK if operation is successful, MAL_FAIL else.
*/
uint16_t MEM_If_Write_FS(uint8_t *src, uint8_t *dest, uint32_t Len)
{
/* USER CODE BEGIN 3 */
uint32_t i = 0;
for(i = 0; i < Len; i += 4)
{
/* Device voltage range supposed to be [2.7V to 3.6V], the operation will
* be done by byte */
if(HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, (uint32_t)(dest + i), *(uint32_t *)(src + i)) == HAL_OK)
{
/* Check the written value */
if(*(uint32_t *)(src + i) != *(uint32_t *)(dest + i))
{
/* Flash content doesn't match SRAM content */
return 2;
}
}
else
{
/* Error occurred while writing data in Flash memory */
return 1;
}
}
return (USBD_OK);
/* USER CODE END 3 */
}
/**
* @brief Memory read routine.
* @param src: Pointer to the source buffer. Address to be written to.
* @param dest: Pointer to the destination buffer.
* @param Len: Number of data to be read (in bytes).
* @retval Pointer to the physical address where data should be read.
*/
uint8_t *MEM_If_Read_FS(uint8_t *src, uint8_t *dest, uint32_t Len)
{
/* Return a valid address to avoid HardFault */
/* USER CODE BEGIN 4 */
uint32_t i = 0;
uint8_t *psrc = src;
for(i = 0; i < Len; i++)
{
dest = *psrc++;
}
/* Return a valid address to avoid HardFault */
return (uint8_t *)(dest);
/* USER CODE END 4 */
}
/**
* @brief Get status routine
* @param Add: Address to be read from
* @param Cmd: Number of data to be read (in bytes)
* @param buffer: used for returning the time necessary for a program or an erase operation
* @retval USBD_OK if operation is successful
*/
uint16_t MEM_If_GetStatus_FS(uint32_t Add, uint8_t Cmd, uint8_t *buffer)
{
/* USER CODE BEGIN 5 */
uint16_t FLASH_PROGRAM_TIME = 50;
uint16_t FLASH_ERASE_TIME = 50;
switch (Cmd)
{
case DFU_MEDIA_PROGRAM:
buffer[1] = (uint8_t)FLASH_PROGRAM_TIME;
buffer[2] = (uint8_t)(FLASH_PROGRAM_TIME << 8);
buffer[3] = 0;
break;
case DFU_MEDIA_ERASE:
default:
buffer[1] = (uint8_t)FLASH_ERASE_TIME;
buffer[2] = (uint8_t)(FLASH_ERASE_TIME << 8);
buffer[3] = 0;
break;
}
return (USBD_OK);
/* USER CODE END 5 */
}
三、main函数
if(HAL_GPIO_ReadPin( GPIOC , GPIO_PIN_3 ) == GPIO_PIN_RESET)//如果有键按下，那么跳转进行程序升级
{
MX_USB_DEVICE_Init();
}
else
{
/* Test if user code is programmed starting from USBD_DFU_APP_DEFAULT_ADD address */
if(((*(__IO uint32_t*)USBD_DFU_APP_DEFAULT_ADD) & 0x2FFE0000 ) == 0x20000000)
{
/* Jump to user application */
JumpAddress = *(__IO uint32_t*) (USBD_DFU_APP_DEFAULT_ADD + 4);
JumpToApplication = (pFunction) JumpAddress;
/* Initialize user application's Stack Pointer */
__set_MSP(*(__IO uint32_t*) USBD_DFU_APP_DEFAULT_ADD);
JumpToApplication();
}
//MX_USB_DEVICE_Init();
}
四、使用STM32CubeProgrammer升级程序。
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
原文链接：https://blog.csdn.net/zhaojing880311/article/details/136304669
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