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https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-22 22:42:00 -04:00
Rework the low power demo that uses the RTCC clock on the Pearl Gecko, and add attentional test code.
This commit is contained in:
Richard Barry
parent
8ffe75f665
commit
9f5095f6bd
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@ -79,6 +79,7 @@
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#include "em_rtcc.h"
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#include "em_rmu.h"
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#include "em_int.h"
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#include "em_letimer.h"
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#include "sleep.h"
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/* SEE THE COMMENTS ABOVE THE DEFINITION OF configCREATE_LOW_POWER_DEMO IN
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@ -88,6 +89,11 @@ in the RTOS port layer. Therefore only build this file if the low power demo
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is being built. */
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#if( configCREATE_LOW_POWER_DEMO == 1 )
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/* When lpUSE_TEST_TIMER is 1 a second timer will be used to bring the MCU out
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of its low power state before the expected idle time has completed. This is
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done purely for test coverage purposes. */
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#define lpUSE_TEST_TIMER ( 0 )
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/* The RTCC channel used to generate the tick interrupt. */
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#define lpRTCC_CHANNEL ( 1 )
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@ -191,12 +197,22 @@ void vPortSetupTimerInterrupt( void )
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NVIC_EnableIRQ( RTCC_IRQn );
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RTCC_IntEnable( RTCC_IEN_CC1 );
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RTCC_Enable( true );
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#if( lpUSE_TEST_TIMER == 1 )
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{
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void prvSetupTestTimer( void );
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/* A second timer is used to test the path where the MCU is brought out
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of a low power state by a timer other than the tick timer. */
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prvSetupTestTimer();
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}
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#endif
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}
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/*-----------------------------------------------------------*/
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void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime )
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{
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uint32_t ulReloadValue, ulCompleteTickPeriods, ulCountBeforeSleep, ulCountAfterSleep;
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uint32_t ulReloadValue, ulCompleteTickPeriods, ulCountAfterSleep;
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eSleepModeStatus eSleepAction;
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TickType_t xModifiableIdleTime;
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@ -221,17 +237,9 @@ TickType_t xModifiableIdleTime;
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/* Stop the RTC momentarily. The time the RTC is stopped for is accounted
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for as best it can be, but using the tickless mode will inevitably result
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in some tiny drift of the time maintained by the kernel with respect to
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calendar time. The count is latched before stopping the timer as stopping
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the timer appears to clear the count. */
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ulCountBeforeSleep = RTCC_CounterGet();
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calendar time. */
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RTCC_Enable( false );
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/* If this function is re-entered before one complete tick period then the
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reload value might be set to take into account a partial time slice, but
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just reading the count assumes it is counting up to a full ticks worth - so
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add in the difference if any. */
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ulCountBeforeSleep += ( ulReloadValueForOneTick - RTCC_ChannelCCVGet( lpRTCC_CHANNEL ) );
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/* Enter a critical section but don't use the taskENTER_CRITICAL() method as
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that will mask interrupts that should exit sleep mode. */
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INT_Disable();
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@ -249,20 +257,16 @@ TickType_t xModifiableIdleTime;
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eSleepAction = eTaskConfirmSleepModeStatus();
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if( eSleepAction == eAbortSleep )
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{
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/* Restart tick and count up to whatever was left of the current time
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/* Restart tick and continue counting to complete the current time
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slice. */
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RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ( ulReloadValueForOneTick - ulCountBeforeSleep ) + ulStoppedTimerCompensation );
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RTCC_Enable( true );
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/* Re-enable interrupts - see comments above the cpsid instruction()
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/* Re-enable interrupts - see comments above the RTCC_Enable() call
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above. */
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INT_Enable();
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}
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else
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{
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/* Adjust the reload value to take into account that the current time
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slice is already partially complete. */
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ulReloadValue -= ulCountBeforeSleep;
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RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ulReloadValue );
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/* Restart the RTC. */
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@ -288,12 +292,11 @@ TickType_t xModifiableIdleTime;
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/* Stop RTC. Again, the time the SysTick is stopped for is accounted
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for as best it can be, but using the tickless mode will inevitably
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result in some tiny drift of the time maintained by the kernel with
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respect to calendar time. The count value is latched before stopping
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the timer as stopping the timer appears to clear the count. */
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ulCountAfterSleep = RTCC_CounterGet();
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respect to calendar time. */
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RTCC_Enable( false );
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ulCountAfterSleep = RTCC_CounterGet();
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/* Re-enable interrupts - see comments above the cpsid instruction()
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/* Re-enable interrupts - see comments above the INT_Enable() call
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above. */
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INT_Enable();
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__asm volatile( "dsb" );
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@ -304,40 +307,30 @@ TickType_t xModifiableIdleTime;
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/* The tick interrupt has already executed, although because this
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function is called with the scheduler suspended the actual tick
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processing will not occur until after this function has exited.
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Reset the reload value with whatever remains of this tick period. */
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ulReloadValue = ulReloadValueForOneTick - ulCountAfterSleep;
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RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ulReloadValue );
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/* The tick interrupt handler will already have pended the tick
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The tick interrupt handler will already have pended the tick
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processing in the kernel. As the pending tick will be processed as
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soon as this function exits, the tick value maintained by the tick
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is stepped forward by one less than the time spent sleeping. The
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actual stepping of the tick appears later in this function. */
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ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
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/* The interrupt should have reset the CCV value. */
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configASSERT( RTCC_ChannelCCVGet( lpRTCC_CHANNEL ) == ulReloadValueForOneTick );
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}
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else
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{
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/* Something other than the tick interrupt ended the sleep. How
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many complete tick periods passed while the processor was
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sleeping? Add back in the adjustment that was made to the reload
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value to account for the fact that a time slice was part way through
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when this function was called. */
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ulCountAfterSleep += ulCountBeforeSleep;
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sleeping? */
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ulCompleteTickPeriods = ulCountAfterSleep / ulReloadValueForOneTick;
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/* The reload value is set to whatever fraction of a single tick
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period remains. */
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ulCountAfterSleep -= ( ulCompleteTickPeriods * ulReloadValueForOneTick );
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ulReloadValue = ulReloadValueForOneTick - ulCountAfterSleep;
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if( ulReloadValue == 0 )
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{
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/* There is no fraction remaining. */
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ulReloadValue = ulReloadValueForOneTick;
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ulCompleteTickPeriods++;
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}
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RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ulReloadValue );
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/* The next interrupt is configured to occur at whatever fraction of
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the current tick period remains by setting the reload value back to
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that required for one tick, and truncating the count to remove the
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counts that are greater than the reload value. */
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RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ulReloadValueForOneTick );
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ulCountAfterSleep %= ulReloadValueForOneTick;
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RTCC_CounterSet( ulCountAfterSleep );
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}
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/* Restart the RTC so it runs up to the alarm value. The alarm value
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@ -379,4 +372,55 @@ void RTCC_IRQHandler( void )
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}
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/*-----------------------------------------------------------*/
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#if( lpUSE_TEST_TIMER == 1 )
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/* Juse used to ensure the second timer is executing. */
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volatile uint32_t ulLETimerIncrements = 0;
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void LETIMER0_IRQHandler( void )
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{
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/* This ISR is used purely to bring the MCU out of sleep mode - it has
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no other purpose. */
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ulLETimerIncrements++;
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LETIMER_IntClear( LETIMER0, LETIMER_IF_COMP0 );
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}
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#endif /* lpUSE_TEST_TIMER == 1 */
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/*-----------------------------------------------------------*/
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#if( lpUSE_TEST_TIMER == 1 )
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/* Set up a timer that used used to bring the MCU out of sleep mode using
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an interrupt other than the tick interrupt. This is done for code coverage
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puposes only. */
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void prvSetupTestTimer( void )
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{
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static const LETIMER_Init_TypeDef xLETimerInitStruct =
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{
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true, /* Enable timer when init complete. */
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false, /* Stop counter during debug halt. */
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true, /* Load COMP0 into CNT on underflow. */
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false, /* Do not load COMP1 into COMP0 when REP0 reaches 0. */
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0, /* Idle value 0 for output 0. */
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0, /* Idle value 0 for output 1. */
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letimerUFOANone, /* No action on underflow on output 0. */
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letimerUFOANone, /* No action on underflow on output 1. */
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letimerRepeatFree /* Count until stopped by SW. */
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};
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const uint32_t ulCompareMatch = 32768UL / 10UL;
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CMU_ClockSelectSet( cmuClock_LFA, cmuSelect_LFXO );
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CMU_ClockEnable( cmuClock_LETIMER0, true );
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LETIMER_CompareSet( LETIMER0, 0, ulCompareMatch );
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LETIMER_IntEnable( LETIMER0, LETIMER_IF_COMP0 );
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NVIC_EnableIRQ( LETIMER0_IRQn );
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LETIMER_Init( LETIMER0, &xLETimerInitStruct);
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}
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#endif /* lpUSE_TEST_TIMER == 1 */
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#endif /* ( configCREATE_LOW_POWER_DEMO == 1 ) */
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