Config and Pinout

[SteinC]

Hi, I'm using a WisBlock setup with:
• RAK19001 base board
• RAK4631 core
RAK18030 microphone in IO slot A
• RAK15002 microSD in IO slot B
I'm running Zephyr / nRF Connect SDK v3.2.4 on nRF52840.
The SD card works and WAV files are written correctly. The PDM driver also initializes and captures buffers successfully. However, the captured microphone data is not real audio. The raw blocks show a large startup transient, then an exponential decay, and then all samples become a constant value (around 7). Speaking or playing a tone directly into the microphone does not change the captured pattern.
We have already tested multiple PDM pin combinations in the Zephyr overlay, different channel selections, and also tried another microphone module. The behavior stays the same.
Could you please confirm the correct routing / pinapping / enable requirements for using RAK18030 on RAK19001 with RAK4631, specifically with RAK152 also installed in the other IO slot?

[Simonr]

Hi Stein

The Zephyr system OFF sample is built for the nRF52 series, so that should be usable for the RAK4631 as well as long as you have board files for it.

If you are to send us boards, we need a couple of boards with access to the SWD pins and details on how it should be powered and a description on how to get it up and running as well as any potential notes on what not to do with the board. We also need a board file reference to know how it generally should look. As for how we send it, I need to find someone else to take over this ticket as I'm on vacation as of next week. If you think that's the way to go, I'll find someone to take over this ticket and let you know if you should ship it to the Trondheim or Oslo office.

A lot of the concepts are the same for current consumption in the nRF52 and nRF54L series, so the Devacademy course should have a lot of relevance for the nRF52 series as well.

Best regards,

Simon

[SteinC]

Hi, Thanks for feedback!

As for the kits we could send you, i think we  will wait a bit with that and get back to you after your vacation. Until then we will focus on the coursematerial now that we know it covers nRF52 series se well.

Have a nice vacation and give us a ping when you are back please.

Best regards Stein

[Simonr]

Duly noted Stein

I will be back from the 20th of July.

Best of luck and regards,

Simon