Help with PDM Pin Mapping on nRF5340 Audio DK

[mighri-manar]

Hi everyone,

I'm new to working with the nRF5340 and Zephyr, and I’m trying to integrate a PDM microphone into my project. While checking the pin mapping for the nRF5340 Audio DK, I couldn't find dedicated PDM_CLK and PDM_DIN pins explicitly listed.

I came across an existing project that used the DMIC interface, and in its Device Tree overlay, it mapped:

PDM_CLK to pin 25

PDM_DIN to pin 26

However, in the default nRF5340 Audio DK application (Unicast Server & Client), these pins are already assigned to the RGB LED controller.

My Questions:
Are there specific pins officially recommended for PDM_CLK and PDM_DIN on the nRF5340 Audio DK?

If pins 25 and 26 are already used for the RGB LED in the default application, should I remap them or use alternative pins for the PDM microphone?

Does the nRF5340 Audio DK support dynamic pin reassignment, or would I need to modify lower-level firmware settings to change these allocations?

Any guidance would be greatly appreciated! Thanks in advance. 😊