nrf5340 Audio Shell audio_system start failed

RE: nrf5340 Audio Shell audio_system start failed

ovrebekk — Thu, 16 May 2024 07:59:16 GMT

Hi Tommy

Good to hear you got it working. If you have any more questions later on just let me know 🙂

Best regards
Torbjørn

RE: nrf5340 Audio Shell audio_system start failed

Tommy_Li — Thu, 16 May 2024 02:06:02 GMT

Hi Ovrebekk,

I was able to successfully play the mono.lc3 file on the BIS headset side.

But there is a prerequisite, which is that the BIS headset side needs to synchronized to the BIS gateway side.

I think some configuration actions have been performed during the sychronization process.

I will investigate how to play the lc3 file without synchronization.

Best Regards.

Tommy.

RE: nrf5340 Audio Shell audio_system start failed

ovrebekk — Wed, 15 May 2024 08:04:24 GMT

Hi Tommy

No problem, just let me know when you've had time to test it.

Regards
Torbjørn

RE: nrf5340 Audio Shell audio_system start failed

Tommy_Li — Wed, 15 May 2024 02:52:45 GMT

Hi Ovrebekk:

Thanks for your kindly help.

I'm on a business trip and will test it immediately once i return to the office.

Best Regards.

Tommy.

RE: nrf5340 Audio Shell audio_system start failed

ovrebekk — Tue, 14 May 2024 11:41:09 GMT

Hi Tommy

One of the developers tested this out on his end, through the following steps:

1) Download and compile the Google liblc3 tool

2) Use the elc3 tool to encode a 48KSpS mono wave file in 96kbs bitrate:
$ elc3 mono.wav -b 96000 mono.lc3

3) Copy the file into the SD card, and then on the BIS headset side, use the RTT terminal to run the following command:

rtt:~$ sd_card_playback play_lc3 mono.lc3

Raw and encoded files attached in the below zip:

devzone.nordicsemi.com/.../mono.zip

Can you test this out and see if it works better?

Best regards
Torbjørn

RE: nrf5340 Audio Shell audio_system start failed

Tommy_Li — Tue, 14 May 2024 01:55:49 GMT

Hi Ovrebekk,

I cloned the liblc3 repository from github, and compiled the source code on ubuntu.

and then i encoded my wav file using elc3 command, and the parameters of the wav file is 48khz stereo.

I copied the created lc3 file to the tf card.

the nrf5340 audio dk could recorgnize the file.

You are right Ovrebekk, I wanted to broadcast the lc3 file from the sdcard.

But i think the first step is to play the lc3 file locally from the headphone jack

Ovrebekk, Could you please provied me a lc3 file which is considered correct from your point of view.

I will test the file to verify the process of playing lc3 file.

Best Regards.

Tommy.

RE: nrf5340 Audio Shell audio_system start failed

ovrebekk — Mon, 13 May 2024 13:34:49 GMT

Hi Tommy

Potentially this could be an issue with the encoded file. Would you be able to provide some details regarding how you created the lc3 file in the first place?

Also, please be aware that the play_lc3 command will simply play back the file to the configured audio output, it will not transmit it over Bluetooth. I am guessing the end goal is to broadcast the lc3 file?

Best regards
Torbjørn

RE: nrf5340 Audio Shell audio_system start failed

Tommy_Li — Sat, 11 May 2024 02:14:56 GMT

Hello,

Can anyone answer my question about how to figure out the issue of playing lc3 file using shell interface for nrf5340 audio dk.

I think the nrf5340_audio application is maintained by the nordic team.

Best Regards.

Tommy.