How to use the PORT event

[hbjin]

HI ,all ! I have a question about PORT event function.

as the 4 channels of GPIOTE (channel0 to channel3 ) have been used for other usage.

i need to use a general IO to detect the falling edge signal, the signal is a 50Hz square wave.

How should i do ~~

[hbjin]

I have to use the GPIOTE->PORT EVENT

[Stian Røed Hafskjold]

but did you enable the interrupt? NVIC_EnableIRQ(GPIOTE_IRQn);