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]

Thank you for clarifying. From a "best practice" perspective, shouldn't we use the apis in nrf_adc.h? I don't have years of experience so I am looking for recommendations (and an understanding of why). I would think using the APIs are safer because there is additional logic that might go into setting a variable?

[Susheel Nuguru]

recommended is that , you should use the API provided by Nordic. Those are examples just for tutorial purposes and in case application want to take things into its hand and access ADC directly.

[i_am_trying]

Thank you. That makes sense. Until I know what I am doing, I will use the APIs. Then once I'm ready to swim in the "deep end of the lake" I will get as close to the registers as possible.

[Susheel Nuguru]

makes sense. Do you need to know something else regarding this matter, if not please accept this answer.