HI everybody
I make an application on a KL27 with freertos and LLS. It works but I'm at the same point as whata at the end of this Tickless Freertos and LLS mode : ulLPTimerInterruptFired was being set too early.
I have started from demo Tickless for Freertos.
As shown in the freertos documentation I defined the 2 macros (configPRE_SLEEP_PROCESSING and configPOST_SLEEP_PROCESSING in FreeRTOSconfig.h with :
#define configPRE_SLEEP_PROCESSING(x) x = 0; myConfigPRE_SLEEP_PROCESSING() // x=0 to not execute the 3 asm lines in fsl_tickless_lptmr.c
#define configPOST_SLEEP_PROCESSING(x) myConfigPOST_SLEEP_PROCESSING(x)
and file myLOWPWR.c with
void myConfigPRE_SLEEP_PROCESSING()
{
smc_power_mode_lls_config_t lls_config = {.enableLpoClock=1 };
PRINTF("sleep!!!\r\n");
DbgConsole_Deinit(); //arret du debug console
PORT_SetPinMux(DEBUG_CONSOLE_RX_PORT, DEBUG_CONSOLE_RX_PIN, kPORT_PinDisabledOrAnalog);
/* Set up LLWU to receive interrupts from LPTMR=0U */
LLWU_EnableInternalModuleInterruptWakup(LLWU, LLWU_LPTMR_IDX, true);
NVIC_EnableIRQ(LLWU_IRQn);
SMC_PreEnterStopModes();
SMC_SetPowerModeLls(SMC, &lls_config);
SMC_PostExitStopModes();
}
void myConfigPOST_SLEEP_PROCESSING(uint32_t xModifiableIdleTime)
{
/* Re-enable console */
PORT_SetPinMux(DEBUG_CONSOLE_RX_PORT, DEBUG_CONSOLE_RX_PIN , kPORT_MuxAlt5); /* PORTE30 is configured as LPUART1_TX */
BOARD_InitDebugConsole();
PRINTF("Wup!!!\r\n");
}
void LLWU_IRQHandler(void)
{
/* If wakeup by LPTMR. */
if (LLWU_GetInternalWakeupModuleFlag(LLWU, LLWU_LPTMR_IDX))
{
vPortLptmrIsr(); // is in fsl_tickless_lptmr.c
}
}
With this, we go well on sleep and the weakup is working too but
void vPortLptmrIsr(void)
{
ulLPTimerInterruptFired = true; //<= this
LPTMR_ClearStatusFlags(vPortGetLptrmBase(), kLPTMR_TimerCompareFlag);
}
is executed before
ulLPTimerInterruptFired = false;
in fsl_tickless_lptmr.c
Because of this the test
if( ulLPTimerInterruptFired )
{
ulCompleteTickPeriods = xExpectedIdleTime - 1UL;
ulLPTimerInterruptFired = false;
}
else
{
/* Something other than the tick interrupt ended the sleep.
Work out how long the sleep lasted rounded to complete tick
periods (not the ulReload value which accounted for part
ticks). */
ulCompleteTickPeriods = LPTMR_GetCurrentTimerCount(pxLptmrBase);
}
prevents the good recovery of tickless freertos.
I solved the problem by setting the initialization of ulLPTimerInterruptFired earlier
This obliges me to modify the file of freertos (fsl_tickless_lptmr.c) and I am afraid that it hides something...
>>Why low power interrupt activate ulLPTimerInterruptFired earlier than the same without low power (jsute tickless) ?
>>how to fix this without changing fsl_tickless_lptmr.c ?
Thanks in advance
