diff options
Diffstat (limited to 'nuttx/configs/twr-k60n512/include/board.h')
| -rwxr-xr-x | nuttx/configs/twr-k60n512/include/board.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/nuttx/configs/twr-k60n512/include/board.h b/nuttx/configs/twr-k60n512/include/board.h index 9de17ef7a..bea58470c 100755 --- a/nuttx/configs/twr-k60n512/include/board.h +++ b/nuttx/configs/twr-k60n512/include/board.h @@ -85,6 +85,36 @@ #define BOARD_FLEXBUS_FREQ (BOARD_MCG_FREQ / BOARD_OUTDIV3) #define BOARD_FLASHCLK_FREQ (BOARD_MCG_FREQ / BOARD_OUTDIV4) +/* SDHC clocking ********************************************************************/ + +/* SDCLK configurations corresponding to various modes of operation. Formula is: + * + * SDCLK frequency = (base clock) / (prescaler * divisor) + * + * The SDHC module is always configure configured so that the core clock is the base + * clock. + */ + +/* Identification mode: 400KHz = 96MHz / ( 16 * 15) */ + +#define BOARD_SDHC_IDMODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV16 +#define BOARD_SDHC_IDMODE_DIVISOR SDHC_SYSCTL_DVS_DIV(15) + +/* MMC normal mode: 16MHz = 96MHz / (2 * 3) */ + +#define BOARD_SDHC_MMCMODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2 +#define BOARD_SDHC_MMCMODE_DIVISOR SDHC_SYSCTL_DVS_DIV(3) + +/* SD normal mode (1-bit): 16MHz = 96MHz / (2 * 3) */ + +#define BOARD_SDHC_SD1MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2 +#define BOARD_SDHC_SD1MODE_DIVISOR SDHC_SYSCTL_DVS_DIV(3) + +/* SD normal mode (4-bit): 24MHz = 96MHz / (2 * 2) */ + +#define BOARD_SDHC_SD4MODE_PRESCALER SDHC_SYSCTL_SDCLKFS_DIV2 +#define BOARD_SDHC_SD4MODE_DIVISOR SDHC_SYSCTL_DVS_DIV(2) + /* LED definitions ******************************************************************/ /* The TWR-K60N512 has four LEDs: * |