Add timer.[ch]

right/src/timer.c

@@ -0,0 +1,18 @@
+#include "fsl_pit.h"
+#include "timer.h"
+
+void Timer_Init(void)
+{
+    pit_config_t pitConfig;
+    PIT_GetDefaultConfig(&pitConfig);
+    PIT_Init(PIT, &pitConfig);
+    PIT_SetTimerPeriod(PIT, PIT_TIMER_CHANNEL, USEC_TO_COUNT(TIMER_INTERVAL_USEC, PIT_SOURCE_CLOCK));
+    PIT_EnableInterrupts(PIT, PIT_TIMER_CHANNEL, kPIT_TimerInterruptEnable);
+//    EnableIRQ(PIT_TIMER_IRQ_ID);
+    PIT_StartTimer(PIT, PIT_TIMER_CHANNEL);
+}
+
+uint32_t Timer_GetTime(void)
+{
+    return PIT_GetCurrentTimerCount(PIT, PIT_TIMER_CHANNEL);
+}