DCMD_SDIO_* Parent topic: DCMD_SDIO_*

DCMD_SDIO_WRITE_IOREG

Write to an I/O register

Synopsis:

#include <mmc/sdio.h>

#define DCMD_SDIO_WRITE_IOREG   __DIOT (_DCMD_MISC, 0x02, sdio_ioreg_t)

Arguments to devctl():

Argument Value
filedes A file descriptor that you obtained by opening the device
dcmd DCMD_SDIO_WRITE_IOREG
dev_data_ptr A pointer to a sdio_ioreg_t
n_bytes sizeof(sdio_ioreg_t)
dev_info_ptr NULL

Description:

This command writes to an I/O register. The sdio_ioreg_t structure is defined as follows: 

typedef struct _sdio_ioreg_t {
        uint8_t         func;
        uint8_t         val;
        uint8_t         rsvd[2];
        uint32_t        reg;
} sdio_ioreg_t;

The members include:

func
The function number
val
The value to write.
reg
The register to write the value in.

Input:

Set all members of the structure.

Output:

None.

See also:

devctl() in the QNX Neutrino C Library Reference

Parent topic: DCMD_SDIO_*