Waking up from RTC on a STM32G030
Hi all,
I'm struggling for days why my RTC wakeup doesn't work.
The program is running FreeRTOS, but I want the uC in Lowpower Sleep for 3 minutes.
So I set RTC on 1Hz, counter 180 and internal wakeup.
Activated the EXTI RTC interrupt.
But it immediately exit SLEEP after 1 sec or so.
I found this topic, but haven't luck so far:
https://community.st.com/t5/stm32-mcus-embedded-software/clearing-the-rtc-wutf-saving-your-sanity-by-sharing-my-hard/m-p/200677
void goToSleep(void)
{
__disable_irq();
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
vTaskDelay(pdMS_TO_TICKS(1000));
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
HAL_SuspendTick();
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0x500B, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
//__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
//__enable_irq();
HAL_NVIC_ClearPendingIRQ(TIM1_BRK_UP_TRG_COM_IRQn);
HAL_NVIC_ClearPendingIRQ(RCC_IRQn);
HAL_NVIC_ClearPendingIRQ(PIR_EXTI_IRQn);
HAL_NVIC_ClearPendingIRQ(ROTARY1_EXTI_IRQn);
HAL_NVIC_ClearPendingIRQ(ROTARY2_EXTI_IRQn);
HAL_NVIC_ClearPendingIRQ(EXTI4_15_IRQn);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUFI);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF);
/* Enter sleep mode */
HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUFI);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF);
__disable_irq();
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
SystemClock_Config();
__enable_irq();
HAL_ResumeTick();
}
I'm really out of options atm.
Timer in code above was sit on 10s for testing purpose
UPDATE:
With STOP mode I got the behavior I wanted, but that is too much current.
Sleep modes basically behave like one __NOP()
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI); //skips sleep
//HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI); //skips sleep
//HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI); //291uA
//HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI); //362uA