Standby mode and wakeup issues using wakeup pin

[sreedharan1196]

Hi i am working with stm32l051c8t6 , i am using wakeup pin 1 to wakeup from standby mode, weather is that possible to make the wakeup pin should act as wakeup pin and also as external interrupt, it should wakeup when an external interrupt is detected on wakeup pin, and make that as count and store in EEPROM for later use, how can i achieve this, guide me to sort out the above requirment 

[Sarra.S]

Hello @sreedharan1196 

Yes, it is possible to configure a pin as a wakeup PIN and EXTI at the same time 

However, there are some considerations to keep in mind, there may be a need for some delay in the code to allow for the configuration change from EXTI to wakeup pin and back...

>>and make that as count and store in EEPROM for later use 

In the EXTI interrupt handler, increment a counter each time the interrupt is triggered and store the updated count value in the EEPROM

 

[sreedharan1196]

In my project, I am using PA0 as an wakeup pin , can u please help me to achieve the functionality,  how to make the configurations

[Sarra.S]

Hello @sreedharan1196 

In HAL_GPIO_EXTI_Callback, before entering standby mode, add:

EEPROM_Write(wakeup_count_address, wakeup_count);

and in the void Enter_Standby_Mode add:

void Enter_Standby_Mode(void)
{ 
 wakeup_count = EEPROM_Read(wakeup_count_address);

 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
 HAL_PWR_EnterSTANDBYMode();
}

 

[sreedharan1196]

sorry, my current issues, is when is going to standby mode, when the wakeup pin raised up its not waking up and printing the wakeup pin, guid me to short out this issues