ADC pin configuration

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Please help me to solve one question，thank you！

nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_2);

The inside of the code

NRF_ADC_CONFIG_INPUT_2 -----》》 NRF_ADC_CONFIG_INPUT_2 = ADC_CONFIG_PSEL_AnalogInput2, /**< Input 2. */

Corresponding physical pin is p0.02 chip？Or other foot?Can I change?How is the configuration?

[Stefan Birnir Sverrisson]

The analog pins are fixed to certain pins, see the nRF51822 PS 3.2, section 2.2. AIN2 input is pin P0.01. There are 8 analog (AIN) pins available that you can use for the ADC.

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Thank you very much!