Interrupt from external Pin doesn't trigger with short pulse?

[noe]

Hi,
I need to implement a simple external interrupt triggered by another IC on a nrf51822. After searching the devzone I found the example in the GIT repo (github.com/.../nrf51_app_gpiote_example) which I used.

Everything works fine when I use a button, but when I change the pin to the one I actually want, it doesn't work. The signal is a 500ns long pulse (high) with 250Hz. I don't get the interrupt (neither rising nor falling edge). Is the pulse too short to detect? Shouldn't it be the edge that is detected?

Thanks in advance.

Noé

[hansensen]

Thanks for the answer. I am currently using nRF52832 and encountered same problem. May i know if the same issue still exist in nrf52 series?