- Diskio_drvTypeDef USER_Driver =
- {
- USER_initialize,
- USER_status,
- USER_read,
- #if _USE_WRITE
- USER_write,
- #endif /* _USE_WRITE == 1 */
- #if _USE_IOCTL == 1
- USER_ioctl,
- #endif /* _USE_IOCTL == 1 */
- };
1、先定义一个USER_CheckStatus,用来检查MMC设置状态,后面几个函数都要调用
- static DSTATUS USER_CheckStatus(BYTE lun)
- {
- Stat = STA_NOINIT;
- while (HAL_HSEM_FastTake(EMMC_HSEM_ID) != HAL_OK)
- {
- }
- if((BSP_MMC_GetCardState(0) == BSP_ERROR_NONE))
- {
- Stat &= ~STA_NOINIT;
- }
- //printf("USER_CheckStatus\r\n");
- HAL_HSEM_Release(EMMC_HSEM_ID, 0);
- return Stat;
- }
2、USER_initialize
需要定义DISABLE_MMC_INIT,即不在这个初始化函数中初始化EMMC,EMMC在main函数中统一初始化。
- DSTATUS USER_initialize (
- BYTE pdrv /* Physical drive nmuber to identify the drive */
- )
- {
- /* USER CODE BEGIN INIT */
- printf("USER_initialize\r\n");
- #if !defined(DISABLE_MMC_INIT)
- while (HAL_HSEM_FastTake(EMMC_HSEM_ID) != HAL_OK)
- {
- }
- if(BSP_MMC_Init(0) == BSP_ERROR_NONE)
- {
- HAL_HSEM_Release(EMMC_HSEM_ID, 0);
- Stat = USER_CheckStatus(pdrv);
- }
- #else
- Stat = USER_CheckStatus(pdrv);
- #endif
- return Stat;
- /* USER CODE END INIT */
- }
3、USER_status获得eMMC状态函数
- DSTATUS USER_status (
- BYTE pdrv /* Physical drive number to identify the drive */
- )
- {
- /* USER CODE BEGIN STATUS */
- return USER_CheckStatus(pdrv);
- /* USER CODE END STATUS */
- }
4、USER_read读函数
- DRESULT USER_read (
- BYTE pdrv, /* Physical drive nmuber to identify the drive */
- BYTE *buff, /* Data buffer to store read data */
- DWORD sector, /* Sector address in LBA */
- UINT count /* Number of sectors to read */
- )
- {
- /* USER CODE BEGIN READ */
- DRESULT res = RES_ERROR;
- ReadStatus = 0;
- #if (ENABLE_MMC_DMA_CACHE_MAINTENANCE == 1)
- uint32_t alignedAddr;
- #endif
- while (HAL_HSEM_FastTake(EMMC_HSEM_ID) != HAL_OK)
- {
- }
- //printf("USER_read\r\n");
- if(BSP_MMC_ReadBlocks(0, (uint32_t*)buff,
- (uint32_t) (sector),
- count) == BSP_ERROR_NONE)
- {
- while(BSP_MMC_GetCardState(0) != BSP_ERROR_NONE)
- {
- }
- res = RES_OK;
- #if (ENABLE_MMC_DMA_CACHE_MAINTENANCE == 1)
- /*
- the SCB_InvalidateDCache_by_Addr() requires a 32-Byte aligned address,
- adjust the address and the D-Cache size to invalidate accordingly.
- */
- alignedAddr = (uint32_t)buff & ~0x1F;
- SCB_InvalidateDCache_by_Addr((uint32_t*)alignedAddr, count*BLOCKSIZE + ((uint32_t)buff - alignedAddr));
- #endif
- }
- else
- {
- res = RES_NOTRDY;
- }
- HAL_HSEM_Release(EMMC_HSEM_ID, 0);
- return res;
- /* USER CODE END READ */
- }
5、USER_write写函数
- #if _USE_WRITE == 1
- DRESULT USER_write (
- BYTE pdrv, /* Physical drive nmuber to identify the drive */
- const BYTE *buff, /* Data to be written */
- DWORD sector, /* Sector address in LBA */
- UINT count /* Number of sectors to write */
- )
- {
- /* USER CODE BEGIN WRITE */
- /* USER CODE HERE */
- DRESULT res = RES_ERROR;
- WriteStatus = 0;
- /*
- * since the MPU is configured as write-through, see main.c file, there isn't any need
- * to maintain the cache as its content is always coherent with the memory.
- * If needed, check the file "Middlewares/Third_Party/FatFs/src/drivers/sd_diskio_dma_template.c"
- * to see how the cache is maintained during the write operations.
- */
- while (HAL_HSEM_FastTake(EMMC_HSEM_ID) != HAL_OK)
- {
-
-
- //printf("USER_write\r\n");
- if(BSP_MMC_WriteBlocks(0, (uint32_t*)buff,
- (uint32_t)(sector),
- count) == BSP_ERROR_NONE)
- {
- while(BSP_MMC_GetCardState(0) != BSP_ERROR_NONE)
- {
- }
- res = RES_OK;
- }
- }
- HAL_HSEM_Release(EMMC_HSEM_ID, 0);
- return res;
- /* USER CODE END WRITE */
- }
- #endif /* _USE_WRITE == 1 */
6、USER_ioctl发送IO控制函数
- #if _USE_IOCTL == 1
- DRESULT USER_ioctl (
- BYTE pdrv, /* Physical drive nmuber (0..) */
- BYTE cmd, /* Control code */
- void *buff /* Buffer to send/receive control data */
- )
- {
- /* USER CODE BEGIN IOCTL */
- DRESULT res = RES_ERROR;
- BSP_MMC_CardInfo CardInfo;
- if (Stat & STA_NOINIT) return RES_NOTRDY;
- while ( HAL_HSEM_FastTake(EMMC_HSEM_ID) != HAL_OK)
- {
- }
- switch (cmd)
- {
- /* Make sure that no pending write process */
- case CTRL_SYNC :
- res = RES_OK;
- break;
- /* Get number of sectors on the disk (DWORD) */
- case GET_SECTOR_COUNT :
- BSP_MMC_GetCardInfo(0, &CardInfo);
- *(DWORD*)buff = CardInfo.LogBlockNbr;
- res = RES_OK;
- break;
- /* Get R/W sector size (WORD) */
- case GET_SECTOR_SIZE :
- BSP_MMC_GetCardInfo(0, &CardInfo);
- *(WORD*)buff = CardInfo.LogBlockSize;
- res = RES_OK;
- break;
- /* Get erase block size in unit of sector (DWORD) */
- case GET_BLOCK_SIZE :
- BSP_MMC_GetCardInfo(0, &CardInfo);
- *(DWORD*)buff = CardInfo.LogBlockSize / MMC_DEFAULT_BLOCK_SIZE;
- res = RES_OK;
- break;
- default:
- res = RES_PARERR;
- }
- while(BSP_MMC_GetCardState(0) != BSP_ERROR_NONE)
- {
- }
- HAL_HSEM_Release(EMMC_HSEM_ID, 0);
- return res;
- /* USER CODE END IOCTL */
- }
- #endif /* _USE_IOCTL == 1 */
7、main函数
- MX_SDMMC1_MMC_Init(); //初始化eMMC
- MX_USB_DEVICE_Init(); //初始化USB Device
- MX_USART3_UART_Init(); //初始化USART3
- MX_FATFS_Init(); //初始化FATFS
8、测试函数
功能:列出文件名、打印STM32.TXT文件内容
- void printFileInfo(FILINFO *fileInfo) {
- WORD fdate = fileInfo->fdate;
- WORD ftime = fileInfo->ftime;
- TCHAR *name = fileInfo->fname;
- FSIZE_t fsize=fileInfo->fsize;
- int year = ((fdate >> 9) & 0x7F) + 1980; // 年份从1980年开始计算
- int month = (fdate >> 5) & 0x0F; // 月份
- int day = fdate & 0x1F; // 日期
- int hour = (ftime >> 11) & 0x1F; // 小时
- int minute = (ftime >> 5) & 0x3F; // 分钟
- int second = ftime & 0x1F; // 秒(注意:这里只使用了最低的5位,可能需要根据实际情况调整)
- if (fileInfo->fattrib & AM_DIR) {
- printf("%04d/%02d/%02d %02d:%02d <DIR> %s\r\n", year, month, day, hour, minute, name);
- }
- else
- {
- printf("%04d/%02d/%02d %02d:%02d %9d %s\r\n", year, month, day, hour, minute,(int)fsize, name);
- }
- }
- static void FS_listDirectory(void)
- {
- FRESULT res;
- DIR dir;
- FILINFO fno;
- uint32_t bytesread;
- uint16_t i;
-
- //printf("[Directory list]:\r\n");
- if(f_mount(&MMCFatFs, (TCHAR const*)MMCPath, 0) == FR_OK)
- {
- //printf("[mount MMC success]\r\n");
- res = f_opendir(&dir, "/");
- if (res == FR_OK)
- {
- //printf("[open directory success]\r\n");
- printf("\r\n[list directory / files ......]:\r\n");
- for (;;) {
- i++;
- res = f_readdir(&dir, &fno);
- if (res != FR_OK || fno.fname[0] == 0) break;
- if (fno.fname[0] == '.') continue;
-
- printFileInfo(&fno);
-
- }
-
- f_closedir(&dir);
- }
-
- if(f_open(&MyFile, "STM32.TXT", FA_READ) == FR_OK)
- {
- /* Read data from the text file */
- memset(rtext,0,sizeof(rtext));
- res = f_read(&MyFile, ( void *)rtext, sizeof(rtext), (void *)&bytesread);
- if((bytesread > 0) && (res == FR_OK))
- {
- printf("\r\n[Display STM32.TXT file content]:\r\n%s\r\n",rtext);
- /* Close the open text file */
- f_close(&MyFile);
- }
- }
- }
- }
三、运行效果
1、FATFS获得信息通过串口打印输出
2、命令行dir对比
3、资源管理器查看U盘内容对比
这样eMMC既是u盘,也是FATFS的设备,可以通过U盘功能copy文本,图片、音频、视频到eMMC,然后MCU这边编写相应程序访问eMMC进行查看,播放。