nRF5340 Audio DK Transparency mode and external PDM

RE: nRF5340 Audio DK Transparency mode and external PDM

Joao Colombari — Wed, 27 Mar 2024 13:31:25 GMT

Hello, Amanda,

Thanks for the tip. I was able to configure the inputs and to route them to the output with cs47l63_reg_conf header file. There is also the Cirrus Logic windows software that helps a lot on finding the registers you need to configure and routing the audio path.

I ran these changes within the Audio Application and got good results, so then I created a new application using only the files needed to communicate with and configure the CS74L63. I am facing some trouble with C compiler that some guys had a few years ago here in DevZone.

For the former problem, I'll wait for your reply and probably close this issue. For the second I'll open a new one.

Happy easter for you guys,
João.

RE: nRF5340 Audio DK Transparency mode and external PDM

Amanda Hsieh — Fri, 22 Mar 2024 19:31:02 GMT

Hi,

[quote user="Joao Colombari"]1 - Can I configure the audio app to use P15 header as input instead of VM3011 mic? [/quote]

The team needs more time to investigate the solution. Next week is the Easter holiday in Norway, and the codec expert will return from vacation after Easter. It might need to wait a little bit, or you can try to cut the trace and forward it to your PDM.

[quote user="Joao Colombari"]2 - Can I use AUX interface as inputs?[/quote]

You can reference the following code:

https://github.com/nrfconnect/sdk-nrf/blob/22fe3fcae951ece109b634f24d2d40fa07c563b1/applications/nrf5340_audio/src/modules/hw_codec.c#L314

Line 316 will use PDM as the audio interface; Line 322 will choose Line-In as the audio interface.

-Amanda H.

RE: nRF5340 Audio DK Transparency mode and external PDM

Joao Colombari — Thu, 21 Mar 2024 13:44:14 GMT

Hello, Amanda,

I will take a look at the WAV repo.

I have seen the Mic post and taken a good look at the HW connections on the DK, so its pretty clear that the line in is going to work only as a test input for analog amplified and buffered mics.

Nevertheless, i've found P15 header (PDM2 referred with label HW_CODEC_PDM_2) and P11 header (Auxilary On-board HW CODEC interface which connects to HW_CODEC_AUX_i2S and I2C labels).

1 - Can I configure the audio app to use P15 header as input instead of VM3011 mic?

2 - Can I use AUX interface as inputs?

Thanks for the quick reply,
Best regards!!

RE: nRF5340 Audio DK Transparency mode and external PDM

Amanda Hsieh — Thu, 21 Mar 2024 13:20:39 GMT

Hi,

[quote user=""]

I want to record and play in the same board, as a transparency mode.

Is there any repo that's already implemented this with the Audio DK?

[/quote]

This is the PR https://github.com/nrfconnect/sdk-nrf/pull/13299, but this is not merged into NCS for some reason. However, this can be a start.

[quote user=""]Can I use this port as a digital mic in??[/quote]

Check this post.

Regards,
Amanda H.