add PIT_TICK_GRANULARITY_1000MS
#define PIT_TICK_GRANULARITY_10MS 100
#define PIT_TICK_GRANULARITY_20MS 50
#define PIT_TICK_GRANULARITY_50MS 20
+#define PIT_TICK_GRANULARITY_1000MS 1
void pit_timer_init(uint32_t frequency);
uint32_t pit_clock();
