Do I need to define an Analog input as such in NRF52?

RE: Do I need to define an Analog input as such in NRF52?

Jørgen Holmefjord — Fri, 15 Dec 2017 08:58:14 GMT

The Ax/Dx marking of the PCA10040 correlates to the Arduino form-factor pin naming.

RE: Do I need to define an Analog input as such in NRF52?

ndarkness — Fri, 15 Dec 2017 08:28:49 GMT

AIN4 is not located at P0.31, it is located on P0.28. Could this cause the issue you are seeing?I think that was the cause of the issue, I was looking into the analog pins of the nrf52832 DK 10040 labelled as Ax, and there A4,which I asssumed to be the AIN4, is mapped to P0.30. Thanks

RE: Do I need to define an Analog input as such in NRF52?

Jørgen Holmefjord — Tue, 12 Dec 2017 12:23:12 GMT

Hi,

You do not need to configure the pins as analog other than selecting the correct pin in for the SAADC pin configuration registers. The analog input will be configured automatically in the GPIO when it is used for analog peripheral, as described in the GPIO documentation.

Please check the pin assignment documentation of the nRF52832. AIN4 is not located at P0.31, it is located on P0.28. Could this cause the issue you are seeing? If not, please describe the values you are seeing, and what you expect.

Best regards,

Jørgen

RE: Do I need to define an Analog input as such in NRF52?

Matt — Mon, 11 Dec 2017 15:36:46 GMT

I think the analog input pins are "fixed" and cannot be remapped to other pins; need Nordic experts to confirm on this one.