STM32C031C6: Determine the wakeup source from shutdown mode

[ouss_mans]

Hello, 

I'm trying to determine the source of the wakeup flag, whether it's the power being turned on or the trigger of wakeup pin 2.

So this is my shutdown function:

After i changed my shutdown function : 

 

 

 

when I try to determine the reason for the wakeup, the register `PWR->SR1` is always 0 when I turn the power on and when I trigger wakeup pin 2.

 

 Is the `PWR->SR1` register reset after waking up from shutdown mode ?

 

I tried something just for testing : 

 

I enabled the wakeup pin in low polarity before checking the register. So, when I trigger the wakeup pin, the `PWR->SR1` is 0, and when I power on the device, it is 2. With this, I can determine the wakeup source, but I don't think it's a good solution :

 

 

 

Can you please give us some feedback about this issue ?

Thank you in advance.

Regards

[Elhem_ZAY]

Hello,
Please find attached the example PWR_STANDBY on NUCLEO-C031C6 can help you, this example works on wake-up the system in pressing the User push-button which is connected to the wake-up pin PWR_WAKEUP_PIN2

[ouss_mans]

Hello @Elhem_ZAY ,

in this example, they check the register for standby mode first, but it's not the same case for shutdown.

For me, the wakeup flag is always zero when I press the button (When the debug is disabled), whereas in debug mode, I receive pwr->SR1 = 258 when I press the button.