How to implement interrupt using GPIO (not GPIOTE) peripheral

[masterLee]

Hi all,

I am trying to create a very simple program with GPIO peripheral (not GPIOTE) that toggles the state of an output pin through an interrupt handler, when an input pin is toggled (i.e button).

I have already seen the pin_change_int example that uses the GPIOTE peripheral to create an interrupt. But since this peripheral has 8 channels (correct?) and I need more that 10 inputs to trigger interrupt I thought  to use the GPIO peripheral because  In the nRF52840 datasheet (Chapter 6.9 page149) it says that GPIO peripheral features interrupt triggering on state changes on any pin.

I tried to implement the GPIO interrupt by adding the nrf_gpio.h in my main but there is no INTENSET register or some function for GPIO peripheral that I can use to create an interrupt.

So what am I doing wrong here?

Thank you

[Sunil519]

Hi, 

I think this link might help you: https://devzone.nordicsemi.com/f/nordic-q-a/35945/nrf_drv_gpiote_in_event_enable

[masterLee]

Hi, Thank you for the reply. Indeed it helps a lot but this is for gpiote peripheral not gpio.

I notice that most of the questions regarding basic implementation of interrupts refer to the pin_change_int where the gpiote is used but not tte gpio peripheral 

I would like to learn if I can do the same thing with GPIO peripheral and how it is done and if not why..

I suspect that it can be done with detect signal and sense mechanism of the GPIO but I cannot understand how to combine an interrupt with that mechanism (if this is the way it can be done)

Thanks

[ovrebekk]

Hi

To get an interrupt for any pin with sense enabled you should use the Port event in the GPIOTE. 

While this still requires the GPIOTE interrupt vector to be used, you don't have to dedicate a separate GPIOTE channel to each pin. 

The catch is that you need to check the state of the pins in the interrupt vector, which is described in the port event section I linked to above. 

Best regards
Torbjørn

[masterLee]

Thank you for your help Sir. I think I got it. Both answers are equally good