STM32F411内部flash做U盘，能够看到设备，但无法格式化

番茄沙司机 · 发表于 2019-8-14 11:42:36

需求是通过串口获取数据，存入Flash，然后连接usb，通过电脑可以看到对应的文件。我想着分为两步实现：
1、插上usb，可以看到U盘，暂定100kb吧。
2、针对内部Flash挂载Fatfs。
工程通过CubeMX来生成。

选择晶振

配置基本按照网上的资料来做的，生成代码。

下面就是在usbd_storage_if.c修改。
下面贴出主要代码。
1、一些宏定义，STORAGE_BLK_NBR 这个修改为了200，其他都是官方例子里面截取的。

#define STORAGE_LUN_NBR 1
//#define STORAGE_BLK_NBR 0x10000
#define STORAGE_BLK_NBR 200
#define STORAGE_BLK_SIZ 0x200
/* USER CODE BEGIN PRIVATE_DEFINES */
#define ADDR_FLASH_SECTOR_0 ((uint32_t)0x08000000) /* Base [url=home.php?mod=space&uid=95564]@[/url] of Sector 0, 16 Kbytes */
#define ADDR_FLASH_SECTOR_1 ((uint32_t)0x08004000) /* Base @ of Sector 1, 16 Kbytes */
#define ADDR_FLASH_SECTOR_2 ((uint32_t)0x08008000) /* Base @ of Sector 2, 16 Kbytes */
#define ADDR_FLASH_SECTOR_3 ((uint32_t)0x0800C000) /* Base @ of Sector 3, 16 Kbytes */
#define ADDR_FLASH_SECTOR_4 ((uint32_t)0x08010000) /* Base @ of Sector 4, 64 Kbytes */
#define ADDR_FLASH_SECTOR_5 ((uint32_t)0x08020000) /* Base @ of Sector 5, 128 Kbytes */
#define ADDR_FLASH_SECTOR_6 ((uint32_t)0x08040000) /* Base @ of Sector 6, 128 Kbytes */
#define ADDR_FLASH_SECTOR_7 ((uint32_t)0x08060000) /* Base @ of Sector 7, 128 Kbytes */
#define FLASH_USER_START_ADDR ADDR_FLASH_SECTOR_7 /* Start @ of user Flash area */

复制代码

2、添加一个函数，来自官方例子。

复制代码

3、修改STORAGE_Read_FS函数。

int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 6 */
if(lun == 0)
{
memcpy(buf,(uint8_t *)(FLASH_USER_START_ADDR + blk_addr), blk_len * STORAGE_BLK_SIZ);
return USBD_OK;
}
return USBD_FAIL;
/* USER CODE END 6 */
}

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4、修改STORAGE_Write_FS函数。

int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
/* USER CODE BEGIN 7 */
if(lun == 0)
{
uint16_t i;
uint32_t FirstSector = 0, NbOfSectors = 0;
HAL_FLASH_Unlock();
/* Get the 1st sector to erase */
FirstSector = GetSector(FLASH_USER_START_ADDR + blk_addr);
/* Get the number of sector to erase from 1st sector*/
NbOfSectors = GetSector(FLASH_USER_START_ADDR + blk_addr + blk_len*FLASH_PAGE_SIZE) - FirstSector + 1;
FLASH_EraseInitTypeDef f;
f.TypeErase = FLASH_TYPEERASE_SECTORS;
f.VoltageRange = FLASH_VOLTAGE_RANGE_3;
f.Sector = FirstSector;
f.NbSectors = NbOfSectors;
uint32_t PageError = 0;
HAL_FLASHEx_Erase(&f, &PageError);
for(i=0; i< blk_len*FLASH_PAGE_SIZE; i+=4)
{
//HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, FLASH_USER_START_ADDR + blk_addr + i, *(uint32_t *)(&buf[i]));
HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, FLASH_USER_START_ADDR + blk_addr + i, *(uint32_t *)(buf+i));
}
HAL_FLASH_Lock();
return USBD_OK;
}
return USBD_FAIL;
/* USER CODE END 7 */
}