Visualizing push button interrupt in a logic analyzer

RE: Visualizing push button interrupt in a logic analyzer

haakonsh — Tue, 18 May 2021 10:39:53 GMT

It is edge-triggered, but it's configured to trigger on both edges (toggle).

You can use either hi-to-lo, lo-to-hi, or toggle (any) edge transition depending on your needs.

RE: Visualizing push button interrupt in a logic analyzer

morpho — Fri, 07 May 2021 06:27:26 GMT

So it's not an edge-triggered interrupt then? Is that what's commonly used in the SDK?

RE: Visualizing push button interrupt in a logic analyzer

haakonsh — Thu, 06 May 2021 11:30:19 GMT

On line 90 of main.c:

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);

The GPIO is set to trigger an interrupt on any transition, not just falling edge, for that you need to use

NRFX_GPIOTE_CONFIG_IN_SENSE_HITOLO(true)

RE: Visualizing push button interrupt in a logic analyzer

morpho — Thu, 29 Apr 2021 04:38:50 GMT

A follow up:

where are we defining whether the interrupt would be triggered at the falling edge?

RE: Visualizing push button interrupt in a logic analyzer

morpho — Thu, 29 Apr 2021 04:22:52 GMT

I see. So P0.11 really is connected to Button 1 and that's where the Channel pin of the logic analyzer would go.

RE: Visualizing push button interrupt in a logic analyzer

haakonsh — Wed, 28 Apr 2021 09:36:04 GMT

Nope, so it should suit your needs.

Reading the example description:
"The application starts with configuring the pins and configuring GPIOTE to give an interrupt on PIN_IN change. The interrupt handler toggles PIN_OUT (LED 1) when PIN_IN (button 1) is pressed or released."

See fig1 in the DK's Connector interface chapter. LED1 is connected to p0.13, I believe it's active low.

RE: Visualizing push button interrupt in a logic analyzer

morpho — Wed, 28 Apr 2021 00:31:26 GMT

I'm using the example `pin_change_int` which doesn't seem to use debouncing, does it?

RE: Visualizing push button interrupt in a logic analyzer

haakonsh — Tue, 27 Apr 2021 09:56:25 GMT

That depends on whether you use a button library with SW de-bouncing or not.