Hello,
So I have a project which uses STOP mode with RTC+EINT pins for wakeup. However I have a situation where I want one of the interrupts to not wake up the device- just set a flag and return to STOP mode.
I know there is HAL_PWR_EnableSleepOnExit() but I believe this will put the processor into SLEEP mode instead of the desired STOP mode.
I thought using:
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);
Would mean that I need to trigger an event after an interrupt to cause the wakeup but I don't believe that is the case- after the interrupt is finished it seems to return to the main loop instead of going back into STOP mode?
What I'm doing:
Enter Sleep:
/* Setup RTC wakeup */
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, sleepDuration, RTC_WAKEUPCLOCK_CK_SPRE_16BITS);
/* Power Control clock */
_RCC_PWR_CLK_ENABLE();
/* Ultra low power mode */
_PWREx_EnableUltraLowPower();
/* Before entering STOPMode function, it is important to ensure that the WUF wakeup flag is cleared */
_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Stop Mode */
_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);
RTC CallBack:
void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) {
/* Wake Up Flag */
_PWR_CLEAR_FLAG(PWR_FLAG_WU);
}
GPIO Call Back:
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
/* ALS wakeup line interrupt detected (Here is where I DON'T want the processor to return to Main Loop) */
if (GPIO_Pin == Light_PA6_Pin && enableLight)
{
lightWakeup = 1;
}
/* Mag wakeup line interrupt detected (Wakeup- return to main loop) */
if (GPIO_Pin == Hall_PB7_Pin && enableHall)
{
magWakeup = 1;
/* Clear Wake Up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
}
/* Switch wakeup line interrupt detected (Wakeup- return to main loop)*/
if (GPIO_Pin == Switch_PB15_Pin && enableSwitch)
{
switchWakeup = 1;
/* Clear Wake Up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
}
}
