1.BootLoader端
配置串口，按键，选择USB为DFU模式，配置地址，生成项目。
打开usbd_dfu_if.c文件，编写函数
/* Private functions ---------------------------------------------------------*/
/**
* @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 */
}
/**
* @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 PageError;
/* Variable contains Flash operation status */
HAL_StatusTypeDef status;
FLASH_EraseInitTypeDef eraseinitstruct;
eraseinitstruct.TypeErase = FLASH_TYPEERASE_PAGES;
eraseinitstruct.PageAddress = Add;
eraseinitstruct.NbPages = 1U;
status = HAL_FLASHEx_Erase(&eraseinitstruct, &PageError);
if(status != HAL_OK)
{
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 (USBD_FAIL);
}
}
else
{
/* Error occurred while writing data in Flash memory */
return (USBD_FAIL);
}
}
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 */
//擦除及写入时间应该按文档改写
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 */
}
打开mian.c文件，编写测试代码
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "usb_device.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
int fputc(int ch, FILE *f)
{
HAL_UART_Transmit(&huart1, (uint8_t *)&ch,1, 0xFFFF);
return ch;
}
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
typedef void (*pFunction)(void);
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
pFunction JumpToApplication;
uint32_t JumpAddress;
/* 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();
MX_USART1_UART_Init();
MX_USB_DEVICE_Init();
/* USER CODE BEGIN 2 */
printf("\r\n*****usb-DFU2222 *****\r\n");
//printf("\r\n*****usb Applocation123456*****\r\n");
//读取PA0引脚电平决定是否进入APP以及判断APP程序入口地址是否存在或正确
//按下按键进入DFU，不按按键进入Application程序
if(HAL_GPIO_ReadPin(KEY_GPIO_Port, KEY_Pin) == GPIO_PIN_RESET)
{
printf("Enter Application\r\n");
/* 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)
{
printf("Jump to user application\n");
/* 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);
__disable_irq(); //此处官方代码未放置关闭中断，在跳转app的时候会出问题！！！！！！
JumpToApplication();
}
}
printf("Key Down Enter DFU\r\n");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
2.APP端
需要修改下载代码地址与上述BootLoader端所设置的一致。
正常运行代码时，USB为虚拟通信串口，建立项目在上篇文章中，在此基础上需加入几行代码。
int main(void)
{
/* USER CODE BEGIN 1 */
__set_FAULTMASK(1);
//地址偏移量
SCB->VTOR=FLASH_BASE | 0x5800;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
__ASM("CPSIE I");
__set_FAULTMASK(0);
/* 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();
MX_USART1_UART_Init();
MX_USB_DEVICE_Init();
/* USER CODE BEGIN 2 */
printf("hello");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
uint8_t i;
uint8_t USB_RX_BUF_Change[USB_REC_LEN];
while (1)
{
printf("\r\n*****usb Applocation333*****\r\n");
HAL_Delay(1000);
if(USB_RX_STA!=0)
{
//USB_printf("USB_RX:");
//CDC_Transmit_FS(USB_RX_BUF,USB_RX_STA);
for(i=0;i<12;i++)
{
USB_RX_BUF_Change=USB_RX_BUF;
//USB_printf("USB_RX_BUF[%d]=%X\n",i,USB_RX_BUF_Change);
USB_printf("%X ",USB_RX_BUF_Change);
}
//USB_printf("\r\n");
USB_RX_STA=0;
memset(USB_RX_BUF,0,sizeof(USB_RX_BUF));
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
当上电时，若按键按下，进入APP代码运行模式。若按键未按下，则进入DFU下载模式。
按下按键时
未按下按键
3.使用USB的DFU模式更新代码
上电不要按下按键，进入DFU模式，打开STM32CubeProgrammer
修改APP端代码，重新编译。用于测试是否更新成功。
选择USB，点击连接，显示连接成功。
点击下载，显示下载成功。
重新上电，按下按键。可知代码更新成功。
进入APP模式可进行虚拟串口通信
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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/m0_53197842/article/details/145617770
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