NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

S MOUNZEO — Wed, 25 Feb 2026 11:37:49 GMT

It's working fine, I guess i just got some dead pins on my board.

Thanks a lot for your support

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

Vidar Berg — Wed, 25 Feb 2026 10:29:45 GMT

Hi,

The comp_trigger_pin is a regular GPIO output that I connected to the Comparator input to trigger th comparator threshold event. How are you triggering the comparator when you are not using this trigger signal?

[quote userid="139199" url="~/f/nordic-q-a/127122/ncs-3-2-1-lpcomp-init-failed-ncs-3-2-1-nrfx-4-0-1/562016"]it seems that if I connect "comp_trigger_pin" to any Pin of Port 1 ( any of the AIN pins) t[/quote]

You must connect it to the AIN pin you've assigned to the comparator. I used AIN4 (P1.11) in my sample.

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

S MOUNZEO — Wed, 25 Feb 2026 10:15:29 GMT

Hi,

I ru the sample abnd it works well, but it seems that if I connect "comp_trigger_pin" to any Pin of Port 1 ( any of the AIN pins) the comparator don't wokr anymore. Can you please check taht behaviour from your side.

Thanks.

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

Vidar Berg — Tue, 24 Feb 2026 09:05:21 GMT

Hi,

I was not able to reproduce this here. I made a small test project to confirm that the callback gets called, please see attached. I connected the "comp_trigger_pin" to the comparator input to periodically trigger the callback. Please try to run this sample on your end and see if you get the same result.

devzone.nordicsemi.com/.../2100.lpcomp_5F00_test.zip

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

S MOUNZEO — Mon, 23 Feb 2026 15:35:39 GMT

HI Vidar Berg ,

I implement the zephyr comparator but the callback is never called. here is my code

&comp {	
	status = "okay";
	psel = <3>;
	refsel = "VDD_9_16";
	compatible = "nordic,nrf-lpcomp";
	enable-hyst;
};


static void lpcomp_callback(const struct device *dev, void *user_data)
{
	int val = comparator_get_output(lpcomp);
	nrf_gpio_pin_toggle(SbgGpio2);
	gpio_pin_set_dt(&ledds5, val);
	printk("Comparator output value %d\n", val);
}

//Init comp
comparator_set_trigger(lpcomp, COMPARATOR_TRIGGER_BOTH_EDGES);
comparator_set_trigger_callback(lpcomp, lpcomp_callback, NULL);

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

S MOUNZEO — Mon, 23 Feb 2026 13:12:31 GMT

Hi Vidar Berg ,

I'm working on a custom boards so I'm not able correctly debug my code and see what's are the returned errors.

I'm trying the Zephyr comparator drvier and keep you in touch.

regards.

RE: NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

Vidar Berg — Mon, 23 Feb 2026 12:53:13 GMT

Hello,

Are you able to step through the nrfx_lpcomp_init() with your debugger to see where the error gets returned? I would also recommend you consider using the Zephyr comparator driver. It is used as a wakep source in this sample : https://github.com/nrfconnect/sdk-zephyr/commit/ae05388943072019f8ea0697f2eeffee5922a737

Best regards,

Vidar