How to detect the RESET button on STM32L552E-EV

[DYann.1]

Hello,

I have a STM32L552E-EV, and I would like to know how to detect the RESET button ?

Thank you for your helps.

[Chris21]

NRST is not a GPIO pin.

int main (void)
{   
    [perhaps hardware initialization code]
    [perhaps HAL_Init();]
    
    printf("I've been reset!!!!");
    
    [other initialization code]
    
    while (1)
    {
        [do stuff]
    }
 }
 
 

[Andrew Neil]

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@DYann.1 wrote:

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Yes, I was mistaken but when I press the button, can't it be detected by software ?

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That's already been explained: that button is connected to the NRST pin.

The NRST pin causes a hardware reset of the chip - so you cannot detect that in software.

But, again, the software can detect the cause of a reset - as described earlier.

[DYann.1]

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@Andrew Neil wrote:

The NRST pin causes a hardware reset of the chip - so you cannot detect that in software.

But, again, the software can detect the cause of a reset - as described earlier.

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OK, I understand but just to make sure before abandoning this track.

[Andrew Neil]

If that's answered your question, please mark the solution:

https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256