diff options
Diffstat (limited to 'nuttx/include/nuttx/sdio.h')
| -rwxr-xr-x[-rw-r--r--] | nuttx/include/nuttx/sdio.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/nuttx/include/nuttx/sdio.h b/nuttx/include/nuttx/sdio.h index 5bd80329c..258fe14c8 100644..100755 --- a/nuttx/include/nuttx/sdio.h +++ b/nuttx/include/nuttx/sdio.h @@ -63,7 +63,27 @@ #define SDIOWAIT_TIMEOUT (1 << 3) /* Bit 3: Timeout */ #define SDIOWAIT_ERROR (1 << 4) /* Bit 4: Some other error occurred */ -#define SDIOWAIT_ALLEVENTS 0x1f +/* SDIOWAIT_WRCOMPLETE (optional) : SDIO driver will use SDIO_D Busy + * signalling to detect Write Complete. This option when selected, will + * enable the MMCSD driver to use the underlying (stm32_sdio only) drivers + * implementation of the SD specs SDIO_D Busy signalling to detect Write + * Complete. This will avoid potentially very long (600Ms+) busy waiting + * in the MMCSD driver. + * + * To implement SDIO_D Busy signalling, the underlying driver must be + * capable of switching the GPIO_SDIO_D0 to be a rising edge sensitive + * interrupt pin. It must then, condition that pin to detect the rising + * edge on receipt of SDWAIT_WRCOMPLETE in the SDIO_WAITENABLE call and + * return it back to regular SDIO mode, when either the ISR fires or pin + * is found to be high in the SDIO_EVENTWAIT call. + */ + +#if defined(CONFIG_MMCSD_SDIOWAIT_WRCOMPLETE) +# define SDIOWAIT_WRCOMPLETE (1 << 5) /* Bit 5: Hardware Write Completion */ +# define SDIOWAIT_ALLEVENTS 0x3f +#else +# define SDIOWAIT_ALLEVENTS 0x1f +#endif /* Media events are used for enable/disable registered event callbacks */ |