Use the same pin to wake up and other uses

RE: Use the same pin to wake up and other uses

clake — Tue, 06 Sep 2022 08:49:24 GMT

Thanks for the reply

Best regards

RE: Use the same pin to wake up and other uses

Håkon Alseth — Tue, 06 Sep 2022 07:47:35 GMT

Hi,

No, we do not have a specific sample that shows debouncing.

The gpio driver in zephyr does not have support for debouncing, but the DK buttons and LEDs library has:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.2/nrf/libraries/others/dk_buttons_and_leds.html

Kind regards,

Håkon

RE: Use the same pin to wake up and other uses

clake — Mon, 05 Sep 2022 09:31:32 GMT

thanks for the reply!

And sorry for my late response. Can you please attach an example of how can I configure it using zephyr?

Best regards!

RE: Use the same pin to wake up and other uses

Håkon Alseth — Fri, 26 Aug 2022 11:42:40 GMT

Hi,

[quote user="clake"]after configure as a sense then, when the nrf52 wake up from system off, the GPIO (I'm using the same as interrupt and for wake up) sense 2 time when I push the button.[/quote]

Systemoff means no clocks are running, only combinatory logic is available, such as a pin change or reset signal.

The wakeup condition is level triggered, meaning when that pin goes active; the nRF will reset and start up.

When waking up, if you get 2 interrupts on that pin, it actually means that you have gotten 3 events.

1 to initially wake up (where as the nRF starts from a reset state), and two afterwards.

What you need to do in order to avoid registering several events after boot-up is to handle this by debouncing the signal in software.

Kind regards,

Håkon

RE: Use the same pin to wake up and other uses

clake — Fri, 26 Aug 2022 06:07:07 GMT

Hi Hákon,

Is a software problem, I'm using the nrf52 DK with the board buttons. The problem is: If I configure one GPIO to use it as interrupt, then only with that I can't wake up the nrf from system_off. So, to be able to wake it up I have to configure the GPIO as sense to wake it up, but after configure as a sense then, when the nrf52 wake up from system off, the GPIO (I'm using the same as interrupt and for wake up) sense 2 time when I push the button. One quick fix that I've made was clean the configuration of the port when it wake up.

Is a more effective way to configure the same GPIO as an interrupt and to use it a sense to wake up?

Best regards

RE: Use the same pin to wake up and other uses

Håkon Alseth — Thu, 25 Aug 2022 12:44:27 GMT

Hi,

[quote user=""]This is executed when long press the button. Then in the wake up, it works but the button has some strange behavior like it us pulsed 2 times at the same time.[/quote]

Do you apply an external pull resistor on the pin? How is your debouncing implemented?

Kind regards,

Håkon