Get the host controller capabilities
Synopsis:
#include <mmc/sdio.h>
#define DCMD_SDIO_GET_HCCAP __DIOF (_DCMD_MISC, 0x06, uint32_t)
Arguments to devctl():
| Argument |
Value |
| filedes |
A file descriptor that you obtained by opening the device |
| dcmd |
DCMD_SDIO_GET_HCCAP |
| dev_data_ptr |
A pointer to a uint32_t |
| n_bytes |
sizeof(uint32_t) |
| dev_info_ptr |
NULL |
Description:
This command gets the device's host controller capabilities.
Output:
The host controller capabilities; a bitwise OR of the following:
- SDIO_HCAP_DMA — the controller supports DMA
- SDIO_HCAP_SG — DMA supports scatter/gather
- SDIO_HCAP_PIO — the controller supports PIO
- SDIO_HCAP_18V — 1.8v is supported
- SDIO_HCAP_30V — 3.0v is supported
- SDIO_HCAP_33V — 3.3v is supported
- SDIO_HCAP_BW1 — 1-bit bus is supported
- SDIO_HCAP_BW4 — 4-bit bus is supported
- SDIO_HCAP_BW8 — 8-bit bus is supported
- SDIO_HCAP_CD_INTR — the host supports card detect interrupt
- SDIO_HCAP_ACMD12 — auto stop command(ACMD12) is supported
- SDIO_HCAP_HS — high-speed devices are supported
See also:
devctl()
in the QNX Neutrino C Library Reference