STM32L496 Sleep & Wakeup

[Abhiram_12]

Split from:

https://community.st.com/t5/stm32-mcus-products/is-is-possible-to-wakeup-the-stm32l496-with-an-external/td-p/741267

as this is a new question.

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Hello @STTwo-32 as the wake up pin associated with stm32L496 is SYSWKUP2 can i use this and on clicking the B1 (i.e. on board button) kindly let me know will the system gets woken up,  also i cannot able to make my system to sleep mode even after using the HAL_EnableSLEEPmode(); function, i also tried using __RCC_HAL_DISABLE_A_PORT(not sure if it exactly matches with HAL macros) for disabling clock individually to every port of the board still it is not going to sleep mode. 

[Sarra.S]

Hello @Abhiram_12, 

Before going to sleep mode, ensure that the WUF2 flag in the power status register is cleared

You can also check this Wiki that covers all low power modes entry/exit using an STM32L4: Getting started with PWR

 

[Karl Yamashita]

In Sleep mode, any interrupt will wake it up. That includes the SysTick.

void EnterSleepMode(void)
{
	HAL_SuspendTick();

	HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);

	HAL_ResumeTick();
}