Best way to count gpio frequency

[Mike R9FT]

I need to count frequency about 1 Khz on GPIO input pin. Is it possible and what is the best way to do this?

 

Tried WrinigOP  isr.c but no luck.

 

Thanks.

 

[Larry Bank]

I added GPIO interrupt callbacks to my ArmbianIO library (https://github.com/bitbank2/ArmbianIO)

 

It should be able to handle that frequency if you make the callback function simple (e.g. increment a counter).