What AIN is sampled when nrf_adc_input_select() is NOT called?

[i_am_trying]

In this ADC example from Nordic on GitHub, it does not appear an AIN has been selected (e.g.: no call to nrf_adc_input_select() ). I don't understand. I have been assuming the AIN is selected, then samples are read in. How does this actually work? When the AIN is selected and when it is not?

[Susheel Nuguru]

I think you need to select the AIN which is missing in the example you mentioned. It should be done the same way the AIN pin is configured in NRF_ADC->CONFIG in github.com/.../main.c

[i_am_trying]

i assume upvoting accepts the answer. Just upvoted.