Unable to configure ADC pin.

RE: Unable to configure ADC pin.

Syed Maysum Abbas Zaidi — Wed, 21 Jan 2026 08:41:48 GMT

Hi,

Yes as mentioned in the Pin Assignments, P1.10 don't have the Analog input capability.

Best Regards,
Syed Maysum

RE: Unable to configure ADC pin.

Gunjan Yadav — Mon, 19 Jan 2026 13:28:39 GMT

Turbo J Thanks for your response.

RE: Unable to configure ADC pin.

Turbo J — Mon, 19 Jan 2026 12:33:00 GMT

Redesign. P1.10 has no analog input capability if I read the datasheet correctly.

RE: Unable to configure ADC pin.

Gunjan Yadav — Mon, 19 Jan 2026 11:39:22 GMT

Syed Maysum Abbas Zaidi Also the MCU is nrf54L15 FYI.

RE: Unable to configure ADC pin.

Gunjan Yadav — Mon, 19 Jan 2026 11:37:30 GMT

VBAT_MON is physically mapped to p1.10

RE: Unable to configure ADC pin.

Gunjan Yadav — Mon, 19 Jan 2026 11:33:51 GMT

Syed Maysum Abbas Zaidi Also can you please suggest anything where I can see mapping of all the channels?

RE: Unable to configure ADC pin.

Gunjan Yadav — Mon, 19 Jan 2026 11:29:02 GMT

Hello, Thanks for your response! similarly I am trying to measure voltage across VBAT_MON . However the the pin assignment document that you have share does not Specifically tells which channel it is mapped to. Does it not support Analog input functionality ?

RE: Unable to configure ADC pin.

Syed Maysum Abbas Zaidi — Fri, 09 Jan 2026 14:26:08 GMT

Hi,

Thanks for the details. Actually on nRF54L15, SAADC inputs (AINx) are tied to specific physical pins and cannot be remapped in software (see nRF54L15 Product Specification Pin assignments). From the schematic you have provided, ANALOG_IN_REV is connected to P1.11, which corresponds to SAADC AIN4. Whereas the current configuration uses NRF_SAADC_AIN3 (which maps to P1.07), so the SAADC driver rejects the setup and adc_channel_setup() returns -EINVAL (-22).

So please update the ADC configuration to use NRF_SAADC_AIN4 (and keep the channel index consistent, e.g. channel@4, reg = <4>). This should resolve the issue.

Best Regards,
Syed Maysum