diff options
Diffstat (limited to 'include/configs/EP1S40.h')
| -rw-r--r-- | include/configs/EP1S40.h | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/include/configs/EP1S40.h b/include/configs/EP1S40.h index 4ad65d8..4d905fe 100644 --- a/include/configs/EP1S40.h +++ b/include/configs/EP1S40.h @@ -119,14 +119,16 @@ * TIMEBASE -- * * The high res timer defaults to 1 msec. Since it includes the period - * registers, we can slow it down to 10 msec using TMRCNT. If the default - * period is acceptable, TMRCNT can be left undefined. + * registers, the interrupt frequency can be reduced using TMRCNT. + * If the default period is acceptable, TMRCNT can be left undefined. + * TMRMS represents the desired mecs per tick (msecs per interrupt). *----------------------------------------------------------------------*/ +#define CONFIG_SYS_HZ 1000 /* Always 1000 */ #define CONFIG_SYS_NIOS_TMRBASE 0x02120820 /* Tick timer base addr */ -#define CONFIG_SYS_NIOS_TMRIRQ 3 /* Timer IRQ num */ -#define CONFIG_SYS_NIOS_TMRMS 10 /* 10 msec per tick */ -#define CONFIG_SYS_NIOS_TMRCNT (CONFIG_SYS_NIOS_TMRMS * (CONFIG_SYS_CLK_FREQ/1000)) -#define CONFIG_SYS_HZ (CONFIG_SYS_CLK_FREQ/(CONFIG_SYS_NIOS_TMRCNT + 1)) +#define CONFIG_SYS_NIOS_TMRIRQ 3 /* Timer IRQ num */ +#define CONFIG_SYS_NIOS_TMRMS 10 /* Desired period (msec) */ +#define CONFIG_SYS_NIOS_TMRCNT \ + (CONFIG_SYS_NIOS_TMRMS * (CONFIG_SYS_CLK_FREQ/1000)) /*------------------------------------------------------------------------ * STATUS LED -- Provides a simple blinking led. For Nios2 each board |