Function esp_idf_svc::sys::sdmmc_io_read_byte

pub unsafe extern "C" fn sdmmc_io_read_byte(
    card: *mut sdmmc_card_t,
    function: u32,
    reg: u32,
    out_byte: *mut u8,
) -> i32

Read one byte from an SDIO card using IO_RW_DIRECT (CMD52)

@param card pointer to card information structure previously initialized using sdmmc_card_init @param function IO function number @param reg byte address within IO function @param[out] out_byte output, receives the value read from the card @return - ESP_OK on success - One of the error codes from SDMMC host controller