本帖最后由 SJZhu 于 2024-10-6 12:04 编辑
STM32H7S78-DK板载了SD卡接口。支持microSD 4gb或更大容量的卡可以插入到插座(CN13)中。STM32H7S7L8H6H通过SDMMC1接口中的四个数据位、CLK和CMD信号与microSD进行通信™卡。SD_Detect信号检测卡插入。当microSD™卡插入时，SD_Detect级别为LOW，否则为HIGH。
在图形化配置界面：
最后还有一个GPIO用于SD卡检测：
点击保存，自动生成代码。
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] SDMMC1 Initialization Function
- * @param None
- * @retval None
- */
- void MX_SDMMC1_SD_Init(void)
- {
- /* USER CODE BEGIN SDMMC1_Init 0 */
- /* USER CODE END SDMMC1_Init 0 */
- /* USER CODE BEGIN SDMMC1_Init 1 */
- /* USER CODE END SDMMC1_Init 1 */
- hsd1.Instance = SDMMC1;
- hsd1.Init.ClockEdge = SDMMC_CLOCK_EDGE_FALLING;
- hsd1.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
- hsd1.Init.BusWide = SDMMC_BUS_WIDE_4B;
- hsd1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
- hsd1.Init.ClockDiv = 0x02;
- if (HAL_SD_Init(&hsd1) != HAL_OK)
- {
- Error_Handler();
- }
- /* USER CODE BEGIN SDMMC1_Init 2 */
- /* USER CODE END SDMMC1_Init 2 */
- }
通过调用FATFS_LinkDriver(&SD_Driver, SDPath)来初始化FatFs。
检测SD卡是否插入的函数：
- static uint8_t SD_IsDetected(void)
- {
- uint8_t ret;
- if (HAL_GPIO_ReadPin(SD_GPIO_PORT, PinDetect) == GPIO_PIN_RESET)
- {
- ret = HAL_ERROR;
- }
- else
- {
- ret = HAL_OK;
- }
- return ret;
- }
接下来就可以正常读写SD卡：
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] File system : file operation
- * @retval File operation result
- */
- static int32_t FS_FileOperations(void)
- {
- FRESULT res; /* FatFs function common result code */
- uint32_t byteswritten, bytesread; /* File write/read counts */
- uint8_t rtext[100]; /* File read buffer */
- /* Register the file system object to the FatFs module */
- if(f_mount(&SDFatFs, (TCHAR const*)SDPath, 0) == FR_OK)
- {
- /* Create and Open a new text file object with write access */
- if(f_open(&SDFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) == FR_OK)
- {
- /* Write data to the text file */
- res = f_write(&SDFile, (const void *)wtext, sizeof(wtext), (void *)&byteswritten);
- if((byteswritten > 0) && (res == FR_OK))
- {
- /* Close the open text file */
- f_close(&SDFile);
- /* Open the text file object with read access */
- if(f_open(&SDFile, "STM32.TXT", FA_READ) == FR_OK)
- {
- /* Read data from the text file */
- res = f_read(&SDFile, ( void *)rtext, sizeof(rtext), (void *)&bytesread);
- if((bytesread > 0) && (res == FR_OK))
- {
- /* Close the open text file */
- f_close(&SDFile);
- /* Compare read data with the expected data */
- if(bytesread == byteswritten)
- {
- /* Success of the demo: no error occurrence */
- return 0;
- }
- }
- }
- }
- }
- }
- /* Error */
- return -1;
- }
通过读卡器把SD卡插入电脑后，可以看到TXT文件：
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