How to write GPIOTE interrupt?

[Nils Minor]

Hi,

i need to stop one of my Timer at the falling edge of a Pin. So i need a gpiote_interrupt, is this right? Can someone help me how i can do this? if i write something like GPIOTE_IRQHandler ( ) it doesn't work.

best regards Nils

[ovrebekk]

Hi Nils

The following steps are required to use interrupts:

1. Tell the peripheral which events should generate interrupts, something like this:

NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_IN0_Msk;

2. Enable the peripheral in the NVIC (if you use the SoftDevice use the sd_nvic_EnableIRQ() instead):

NVIC_EnableIRQ(GPIOTE_IRQn);

3. Implement the interrupt handler, and remember to check/clear the event:

void GPIOTE_IRQHandler(void)
{
    if(NRF_GPIOTE->EVENTS_IN[0] != 0)
    {
        NRF_GPIOTE->EVENTS_IN[0] = 0;
        
        // Add your code here
    }
}

On a side note, have you considered using the PPI to stop the timer automatically on the GPIOTE event? Then you might not need the interrupt at all.

[Stanley]

Hi Nils, I have tried another example to test the gpio interrupt as the following link, it worked as expected on button_1. devzone.nordicsemi.com/.../