Detecting a button double click?

Question

We are new to Nordic and have been making great progress with our nrf52840DK board and successfully running many of the Nordic SDK examples. We can't seem to find a single example of an API that will notify on a variety of button events (more than just a single click). Our code needs to respond differently for single-click, double-click, press-and-hold. Sure seems that the Nordic SDK would have something for that. Yes? Any help would be appreciated. 
 Thanks, 
 Steve K, PuzL Labs, LLC

Johnny Nguyen · Accepted Answer

Hi Steve. To address the CAF front, here's a sample I modified from the CAF sample to use single and double clicks: droidecahedron/caf_click 
 
 However, you can alternatively continue using your i/o callback and add some logic with Timers &mdash; Zephyr Project Documentation to determine single vs double vs long. These can be pretty cheap. 
 
 I have a generic i/o practice repo that utilizes the logic pretty similarly here to the CAF example: droidecahedron/nrf_io_practice 
 (You can take whatever is used in io.c and roll it into your main.c however you like. I just abstracted it away to another file in that project to keep main empty.) 
 
 Both need some clean up but either of them should get you most of the way there. I am partial to using timers over CAF for this use case. Pick whichever you prefer. One benefit of using timers is you can specify a bit more what the "double click" duration is in a straightforward way. Another is knowing pretty directly which peripherals are actually being used.

Detecting a button double click?

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