diff --git a/right/src/timer.c b/right/src/timer.c index 4106877..afa0ae0 100644 --- a/right/src/timer.c +++ b/right/src/timer.c @@ -1,12 +1,15 @@ #include "fsl_pit.h" #include "timer.h" +#include "peripherals/test_led.h" static volatile uint32_t CurrentTime; +static uint32_t timerClockFrequency; void PIT_TIMER_HANDLER(void) { CurrentTime++; - PIT_ClearStatusFlags(PIT, PIT_TIMER_CHANNEL, PIT_TFLG_TIF_MASK); + //TEST_LED_TOGGLE(); + PIT_ClearStatusFlags(PIT, PIT_TIMER_CHANNEL, kPIT_TimerFlag); } void Timer_Init(void) @@ -15,9 +18,8 @@ void Timer_Init(void) PIT_GetDefaultConfig(&pitConfig); PIT_Init(PIT, &pitConfig); - // TODO: Why the interval needs to be multiplied by two to arrive to the correct timing? - // Figure it out and clean this up. - PIT_SetTimerPeriod(PIT, PIT_TIMER_CHANNEL, MSEC_TO_COUNT(TIMER_INTERVAL_MSEC*2, PIT_SOURCE_CLOCK)); + timerClockFrequency = PIT_SOURCE_CLOCK; + PIT_SetTimerPeriod(PIT, PIT_TIMER_CHANNEL, MSEC_TO_COUNT(TIMER_INTERVAL_MSEC, timerClockFrequency)); PIT_EnableInterrupts(PIT, PIT_TIMER_CHANNEL, kPIT_TimerInterruptEnable); EnableIRQ(PIT_TIMER_IRQ_ID); @@ -28,20 +30,49 @@ uint32_t Timer_GetCurrentTime() { return CurrentTime; } +uint32_t Timer_GetCurrentTimeMicros() { + uint32_t primask, count, ms; + primask = DisableGlobalIRQ(); // Make sure the read is atomic + count = PIT_GetCurrentTimerCount(PIT, PIT_TIMER_CHANNEL); // Read the current timer count + ms = CurrentTime; // Read the overflow counter + EnableGlobalIRQ(primask); // Enable interrupts again if they where enabled before - this should make it interrupt safe + + uint32_t us = COUNT_TO_USEC(count, timerClockFrequency); + return ms * 1000U * TIMER_INTERVAL_MSEC + us; +} + void Timer_SetCurrentTime(uint32_t *time) { - *time = CurrentTime; + *time = Timer_GetCurrentTime(); +} + +void Timer_SetCurrentTimeMicros(uint32_t *time) +{ + *time = Timer_GetCurrentTimeMicros(); } uint32_t Timer_GetElapsedTime(uint32_t *time) { - uint32_t elapsedTime = CurrentTime - *time; + uint32_t elapsedTime = Timer_GetCurrentTime() - *time; + return elapsedTime; +} + +uint32_t Timer_GetElapsedTimeMicros(uint32_t *time) +{ + uint32_t elapsedTime = Timer_GetCurrentTimeMicros() - *time; return elapsedTime; } uint32_t Timer_GetElapsedTimeAndSetCurrent(uint32_t *time) { uint32_t elapsedTime = Timer_GetElapsedTime(time); - *time = CurrentTime; + *time = Timer_GetCurrentTime(); + return elapsedTime; +} + +uint32_t Timer_GetElapsedTimeAndSetCurrentMicros(uint32_t *time) +{ + uint32_t elapsedTime = Timer_GetElapsedTimeMicros(time); + *time = Timer_GetCurrentTimeMicros(); return elapsedTime; } diff --git a/right/src/timer.h b/right/src/timer.h index 1ce3218..5acbcce 100644 --- a/right/src/timer.h +++ b/right/src/timer.h @@ -13,8 +13,12 @@ void Timer_Init(void); uint32_t Timer_GetCurrentTime(); + uint32_t Timer_GetCurrentTimeMicros(); void Timer_SetCurrentTime(uint32_t *time); + void Timer_SetCurrentTimeMicros(uint32_t *time); uint32_t Timer_GetElapsedTime(uint32_t *time); + uint32_t Timer_GetElapsedTimeMicros(uint32_t *time); uint32_t Timer_GetElapsedTimeAndSetCurrent(uint32_t *time); + uint32_t Timer_GetElapsedTimeAndSetCurrentMicros(uint32_t *time); #endif