ADC channel changes from NCS 3.1.1 to NCS 3.2.0

RE: ADC channel changes from NCS 3.1.1 to NCS 3.2.0

brave_niuniu — Fri, 03 Apr 2026 03:51:36 GMT

Hi runar,

Thanks for your reply, I found that this problem was caused by setting the wrong channel in the adc_channel_setup() function in the application, not an issue with the device tree.

RE: ADC channel changes from NCS 3.1.1 to NCS 3.2.0

runsiv — Wed, 01 Apr 2026 09:01:26 GMT

Update:

So Zephyr has made some changes in the ADC driver and you now need to configure each channel by themself compared to how it was before.

[quote user=""]

1.This error occurs during ADC setup when using channel 7 in NCS 3.2.0: <err> adc_nrfx_saadc: Cannot configure channel 0: -22. Normally, all 8 channels should be usable properly. I don't know why the error occurs in NCS 3.2.0.

[/quote]

Your overlay seems to be valid for me. Can you do a pristine build and compare your overlay.dts to the generated one after building?

[quote user=""]2.If I do not use channel 6 but other channels such as channel 0 and channel 1, the voltage collected using adc_raw_to_millivolts(); will not be valid data. I do not see any other ADC channels being used in the final generated zephyr.dts, so I am not sure what exactly causes only channel 6 to be able to collect valid battery level data.[/quote]

This makes sense as as i presume your battery divider is is connected to pin corresponding to AIN7. No other channel can see the signal if you don't change the dts.

Regards

Runar

RE: ADC channel changes from NCS 3.1.1 to NCS 3.2.0

runsiv — Tue, 31 Mar 2026 13:08:37 GMT

I will investigate this. It might be related to new nrfx version where they introduced a log of breaking changes ref https://github.com/NordicSemiconductor/nrfx/blob/master/doc/nrfx_4_0_migration_guide.md

Regards

Runar

RE: ADC channel changes from NCS 3.1.1 to NCS 3.2.0

brave_niuniu — Tue, 31 Mar 2026 01:27:17 GMT

Thanks for your advice, but the same error occurs in NCS 3.2.4

RE: ADC channel changes from NCS 3.1.1 to NCS 3.2.0

Turbo J — Mon, 30 Mar 2026 10:03:42 GMT

Try NCS 3.2.4 version. Your problems sound very much like a known bug to me.