AIN0 not measuring on pca10028

[gaminn]

Hello, measuring ADC signal on P0.26/AIN0/XL2 and P0.27/AIN1/XL1 doesn't work (I get constant value from the ADC not reflecting actual voltage on the pin). AIN2 - AIN7 seem to work.

I hope 32khz xtal (it occupies these two pins) is disabled by calling SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, NULL);

What else can it be?

[RK]

Just because the nrf51 isn't using the crystal itself doesn't mean it disappears from the universe, or from the circuit. So unless you've physically removed it from the board you are shorting your AIN0/AIN1 voltage across a crystal, which depending on frequency of your input is acting anything from a small resistance to a large one. So it's probably not going to work.