Chapter 2. API Reference
• card: pointer to card information structure previously initialized using sdmmc_card_init
• function: IO function number
• addr: byte address within IO function where reading starts
• dst: buffer which receives the data read from card
• size: number of bytes to read
esp_err_t sdmmc_io_write_bytes(sdmmc_card_t *card, uint32_t function, uint32_t addr, const void
*src, size_t size)
Write multiple bytes to an SDIO card using IO_RW_EXTENDED (CMD53)
This function performs write operation using CMD53 in byte mode. For block mode, see sd-
mmc_io_write_blocks.
Return
• ESP_OK on success
• ESP_ERR_INVALID_SIZE if size exceeds 512 bytes
• One of the error codes from SDMMC host controller
Parameters
• card: pointer to card information structure previously initialized using sdmmc_card_init
• function: IO function number
• addr: byte address within IO function where writing starts
• src: data to be written
• size: number of bytes to write
esp_err_t sdmmc_io_read_blocks(sdmmc_card_t *card, uint32_t function, uint32_t addr, void *dst,
size_t size)
Read blocks of data from an SDIO card using IO_RW_EXTENDED (CMD53)
This function performs read operation using CMD53 in block mode. For byte mode, see sd-
mmc_io_read_bytes.
Return
• ESP_OK on success
• ESP_ERR_INVALID_SIZE if size is not divisible by 512 bytes
• One of the error codes from SDMMC host controller
Parameters
• card: pointer to card information structure previously initialized using sdmmc_card_init
• function: IO function number
• addr: byte address within IO function where writing starts
• dst: buffer which receives the data read from card
• size: number of bytes to read, must be divisible by the card block size.
esp_err_t sdmmc_io_write_blocks(sdmmc_card_t *card, uint32_t function, uint32_t addr, const
void *src, size_t size)
Write blocks of data to an SDIO card using IO_RW_EXTENDED (CMD53)
This function performs write operation using CMD53 in block mode. For byte mode, see sd-
mmc_io_write_bytes.
Return
• ESP_OK on success
• ESP_ERR_INVALID_SIZE if size is not divisible by 512 bytes
• One of the error codes from SDMMC host controller
Parameters
• card: pointer to card information structure previously initialized using sdmmc_card_init
• function: IO function number
• addr: byte address within IO function where writing starts
• src: data to be written
• size: number of bytes to read, must be divisible by the card block size.
esp_err_t sdmmc_io_enable_int(sdmmc_card_t *card)
Enable SDIO interrupt in the SDMMC host
Return
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