Function sdmmc_io_read_bytes

pub unsafe extern "C" fn sdmmc_io_read_bytes(
    card: *mut sdmmc_card_t,
    function: u32,
    addr: u32,
    dst: *mut c_void,
    size: usize,
) -> esp_err_t

Read multiple bytes from an SDIO card using IO_RW_EXTENDED (CMD53)

This function performs read operation using CMD53 in byte mode. For block mode, see sdmmc_io_read_blocks.

By default OP Code is set (incrementing address). To send CMD53 without this bit, OR the argument addr with SDMMC_IO_FIXED_ADDR.

@param card pointer to card information structure previously initialized using sdmmc_card_init @param function IO function number @param addr byte address within IO function where reading starts @param dst buffer which receives the data read from card. Aligned to 4 byte boundary unless SDMMC_HOST_FLAG_ALLOC_ALIGNED_BUF flag is set when calling sdmmc_card_init. The flag is mandatory when the buffer is behind the cache. @param size number of bytes to read, 1 to 512. @return - ESP_OK on success - ESP_ERR_INVALID_SIZE if size exceeds 512 bytes - One of the error codes from SDMMC host controller