STM32F401 SDIO HAL driver initializes SD card

The HAL part of STM32F4xx already provides the SD driver, and the IO PINs during initialization are placed in HAL_SD_MspInit.

void HAL_SD_MspInit(SD_HandleTypeDef *hsd)

{

GPIO_InitTypeDef  GPIO_InitStruct;

__HAL_RCC_GPIOC_CLK_ENABLE();

__HAL_RCC_GPIOD_CLK_ENABLE();

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

GPIO_InitStruct.Pull      = GPIO_PULLUP;

GPIO_InitStruct.Speed     = GPIO_SPEED_FAST;

GPIO_InitStruct.Alternate = GPIO_AF12_SDIO;

/*SDIO GPIO Configuration   

PC8     ------> SDIO_D0

PC9     ------> SDIO_D1

PC10     ------> SDIO_D2

PC11     ------> SDIO_D3

PC12     ------> SDIO_CK

PD2     ------> SDIO_CMD

*/

GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9 | GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12;    

HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_2;    

HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

__HAL_RCC_SDIO_CLK_ENABLE(); 

__SDIO_CLK_ENABLE();

hsd->Instance = SDIO;

hsd->Init.ClockEdge           = SDIO_CLOCK_EDGE_RISING;

hsd->Init.ClockBypass         = SDIO_CLOCK_BYPASS_DISABLE;

hsd->Init.ClockPowerSave      = SDIO_CLOCK_POWER_SAVE_DISABLE;

hsd->Init.BusWide             = SDIO_BUS_WIDE_1B;

hsd->Init.HardwareFlowControl = SDIO_HARDWARE_FLOW_CONTROL_DISABLE;

hsd->Init.ClockDiv            = SDIO_TRANSFER_CLK_DIV;

}

Define two variables

SD_HandleTypeDef hsd;

HAL_SD_CardInfoTypedef SDCardInfo;

The relevant code for initializing the SD card in the main function:

__IO HAL_SD_ErrorTypedef errorstate = SD_OK;

errorstate = HAL_SD_Init(&hsd, &SDCardInfo);

if(SD_OK == errorstate)

{

errorstate = HAL_SD_WideBusOperation_Config(&hsd, SDIO_BUS_WIDE_4B);

if(SD_OK != errorstate)

{

while(1);

}

....

}

The HAL_SD_Init() function will first call HAL_SD_MspInit() to initialize PIN and clk, etc.

It should be noted that the bus width can only be set to 1 bit during initialization, and then

HAL_SD_WideBusOperation_Config(&hsd, SDIO_BUS_WIDE_4B) is used to switch to 4-bit mode. It is invalid to directly set it to 4 bits during initialization.

After completing the above work, you can use HAL_SD_ReadBlocks() and HAL_SD_WriteBlocks() to complete block read and write operations. If FATFS is needed, you can refer to other examples.