about button long press and short press detect

RE: about button long press and short press detect

Roger Clark — Thu, 08 Sep 2016 22:16:43 GMT

Just to add a little to Ole's answer

You will still need to debounce the button.

Just starting a timer when you get an external interrupt when the button has changed, will suffer from debounce and you code will keep telling you that you have a short press.

You first need to debounce the button and only start the app_timer when the button is in a stable "Pushed" state

RE: about button long press and short press detect

gortok — Thu, 08 Sep 2016 21:52:55 GMT

I've written an answer here: devzone.nordicsemi.com/.../

RE: about button long press and short press detect

Ole Bauck — Thu, 08 Sep 2016 15:05:40 GMT

Regarding this question:

The only example that shows long press and short press is the bsp module in the latest SDK. For example see bsp_button_event_handler(..) in bsp.c in SDK12. This uses more or less the same technique as I described in my answer (app_timer_start/app_timer_stop).

RE: about button long press and short press detect

Ole Bauck — Thu, 08 Sep 2016 14:56:31 GMT

Here is an example on app_button alone (no short or long press detection).

RE: about button long press and short press detect

Ole Bauck — Thu, 08 Sep 2016 14:53:25 GMT

As Roger said the BUTTON_DETECTION_DELAY is intended for debouncing delay which is used to ensure that the input level is stable before reading the value (do a search on google on "button debouncing" for more info about debouncing).

If you intend to distinguish between short press and long press you should use app_timer. For example start a timer with a certain timeout when the button is pushed and stop it when the button is released. If the timer has timed out it is a short push, if it has timed out it is a long push.

RE: about button long press and short press detect

Ole Bauck — Thu, 08 Sep 2016 14:36:25 GMT

Can't find any closed question from Sep 25 '14 related to this topic, what was the title or which topic was the question about?

RE: about button long press and short press detect

Roger Clark — Thu, 08 Sep 2016 11:29:03 GMT

The definition you are referring to appears to be used by the call to app_button_init()

This uses a timer to debounce one or more buttons

If you want to have different debounce times, you could use multiple timers, but this seems somewhat wasteful, or you could just write your own debounce function

RE: about button long press and short press detect

ehitil — Wed, 07 Sep 2016 12:56:03 GMT

nrf51822 qfaa sdk use 7.3