NRF52840 how to change GPIO pin for SAADIC example project?

[cpeng]

The example initializes the SAADC driver and configures one channel to sample analog input 0 (GPIO pin 2).

 I would like to know how to change analog input pin to other GPIOs like P0.00~P1.03

Like where in the code you change your GPIO pins?

Thanks.

[abdelali]

Hi @cpeng,

To change the analog input pin been set in the example code , you need to update it in this function : 

NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE();

For the possible values for (PIN_N) to this function : 

nrf_saadc_channel_config_t channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(PIN_N);

Check here :

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/group__nrf__saadc__hal.html?cp=6_1_6_9_0_30_2_8#ga4adceebeae2b334a695d4aecb640fe35

And for the mapping to the nrf52840 dk , check here : 

infocenter.nordicsemi.com/.../hw_analog_pins.html

Best regards,

Abdelali