How to set GPIO pin DETECT signal with NCS ?

RE: How to set GPIO pin DETECT signal with NCS ?

ovrebekk — Wed, 01 Dec 2021 14:28:53 GMT

Hi Romain

Sorry for the slow response on this case. Håkon is currently unavailable, and I will help out in the mean time.

Are you still having issues with this?

If so, can you please share the current state of your code, and I will take a look at it right away.

Best regards
Torbjørn

RE: How to set GPIO pin DETECT signal with NCS ?

Romain — Fri, 15 Oct 2021 14:16:08 GMT

I have tested both variants gpio_pin_configure() and nrf_gpio_cfg_sense_input() but only the second one set the correct value in PIN_CNF[myPIN].

But the nRF still doesn't wakeup when the pulse comes on the configured pin... The trace shows the level high pulse (~20us) and the nRF never start (LOG in SYSINIT and main don't show up...).

My proj.conf (or autoconf.h) has CONFIG_PM=y, CONFIG_PM_DEVICE=y, CONFIG_GPIO=y, the System OFF demo works correctly on my nrf52840dk.

RE: How to set GPIO pin DETECT signal with NCS ?

Romain — Fri, 15 Oct 2021 07:56:08 GMT

Hi Håkon,

[quote userid="90815" url="~/f/nordic-q-a/80539/how-to-set-gpio-pin-detect-signal-with-ncs/333931#333931"]How does this fail?[/quote]

The nRF never wakes-up (it needs POR).

Yes I think GPIO_INT_LEVEL_LOW would be more suitable than GPIO_INT_LOW_0 alone but it still doesn't work.

I missed the sample nRF5x System Off demo, good to know. Interesting, it uses hal/nrf_gpio with command nrf_gpio_cfg_sense_set().

I may ask my question differently:

What do you suggest to use DETECT signal by setting SENSE on a GPIO pin (register PIN_CNF[16,17]) when using NCS ?

- Is it only available through nrf_gpio

- Does it exist within GPIO API

- Should I simply direct access PIN_CNF register

RE: How to set GPIO pin DETECT signal with NCS ?

helsing — Wed, 13 Oct 2021 12:16:50 GMT

Hi Romain,

[quote user=""]I use gpio_pin_configure() with GPIO_INPUT | GPIO_INT_HIGH_1 flags but it doesn't work[/quote]

How does this fail?

[quote user=""]GPIO_INT_HIGH_1 and GPIO_INT_LOW_0 are the correct flags ?[/quote]

Please see the available flags in the GPIO API reference for v1.6.1. Are the flags below the ones you might be looking for? If using these flags does not help I will have a closer look at the procedure.

GPIO_INT_LEVEL_LOW
Configures GPIO interrupt to be triggered on pin physical level low and enables it.
GPIO_INT_LEVEL_HIGH
Configures GPIO interrupt to be triggered on pin physical level high and enables it.

Have you tried modifying the nfc/system_off sample as suggested in the sample's README.rst?

Another sample to look at is the nRF5x System Off demo.

Best regards,

Håkon