Button Press detected twice when pushed once

RE: Button Press detected twice when pushed once

Moritz_S — Thu, 28 Jul 2022 13:06:04 GMT

Hi Simon,

thanks for your answer. I just wanted to let you know that we are still looking into this. I will get back to you after my holidays.

Kind regards,

Moritz

RE: Button Press detected twice when pushed once

Simonr — Wed, 20 Jul 2022 11:31:53 GMT

The app_timer library does indeed use the configured LF clock/crystal by default. In our example projects the default configuration is to use the optional external 32.768 kHz crystal. If you don't have this crystal on your custom board you will have to use the internal RC oscillator instead. In your timer_init() function it seems like you are using the external LF crystal though.

Best regards,

Simon

RE: Button Press detected twice when pushed once

Moritz_S — Tue, 19 Jul 2022 12:29:42 GMT

Hi Simonr,

I'm including the "app_button.h" header, I initialize the clock (see init_clock above) and the buttons (see buttons_init above) as it is shown in the ble_blinky example. If this is done correctly, I don't see why the timer should not work (app_timer.h is also included an initialized in timers_init()).

We are using a custom board. I will verify with my hardware expert, if the button is installed correctly. Does the app_timer library rely on an external crystal or is everything built into the SOC (we are using nrf52832).

RE: Button Press detected twice when pushed once

Simonr — Tue, 19 Jul 2022 12:09:04 GMT

It sounds like you're not having a debounce implemented in your application. The button handler lib uses the GPIOTE handler to detect a button that has been pushed, and should start a timer in the GPIOTE event handler to handle this. The button will only be reported as pushed if the corresponding pin is still active when the timer expires. If there is a new GPIOTE event while the timer is running, the timer is restarted.

For the hardware side of things, as long as there is a pull-up on the pin (internal or external) and there is a physical switch or button that connect the input to ground when pressed, then it can be used as a button. Are you using a Development Kit or a custom board for your application?

Best regards,

Simon