nRF5430 audio DK - configure stereo BIC mode

[ChrisKay]

Hello,

I have 2 of the nRF5430 audio development kits, hence my debuggin possibilities are a little bit limited. But as far as I understand the BIC mode can be used to stream audio to multiple sinks at the same time. At least for my 2 boards, this seems to be working. But I can only archive a mono signal. In the manual is stated, that I can switch between left and right via the press of one of the volume buttons during reset. After some testing I figured out that this is true as well, but the audio signal is always outputed on the same side of my headphone. So I was wondering how I can configure the audio DK to output true stereo from a single sink?

Yours faithfully

Chris

[ChrisKay]

Oh, a clear case of RTFM first. The 160 Dollar audio DK only has a mono headphone output. Whatever lead to this design decision, I find it hard to believe, that you do not offer a Stereo output on this.

In this case, what can I do to get an Stereo signal? Attach a simple Stereo DAC like the PCM5102 to the I2S bus? What parts of the source code must be modified?

Best regards

Chris

[Amanda Hsieh]

Hi, 

Check out this post. 

Regards,
Amanda H.

[ChrisKay]

Thank you Amanda, From what I see on in the Github links it looked doable. Unfortunatley the code is outdate not suitable for the newest SDKs anymore.

Another problem ist that the regular BIS example is already unstable. The link is lost after a minute or so. Resetting the sink device restores the stream.

I've added this lines to the prj.conf file

CONFIG_STREAM_BIDIRECTIONAL=n

CONFIG_TRANSPORT_BIS=n

maybe I'm missing something else?

[Amanda Hsieh]

Hi, 

Sorry for the delay. 

ChrisKay said:

Another problem ist that the regular BIS example is already unstable. The link is lost after a minute or so. Resetting the sink device restores the stream.

What NCS version are you using? Could you try with the latest version, v2.5.2?

Also for setup of the BIS, please add the following configs into prj.conf

CONFIG_TRANSPORT_BIS=y # the default setting for project is CIS mode, so we need to turn this on for BIS

CONFIG_AUDIO_SOURCE_I2S=y # using I2S instead of USB can lead to better user experience

If it doesn't help with the issue, please provide the log from the application. 

Regards,
Amanda H.

[ChrisKay]

Hello Amanda,

thank you again for your support. Indeed I was using the SDK version 2.5.1.

I will give the 2.5.2 a try. Unfortunately I have many different topics on my list right now. So tinkering with the Audio DK is low priority right now. Therefore my responses might be coming slow.

I've tested both options I2S_Input and USB Input in both cases the stream is only working for a few seconds.

Here is the output of the sink device

*** Booting nRF Connect SDK v2.5.2 ***
HL [00:00:00.258,453] <inf> fw_info:
         nRF5340 Audio nRF5340 Audio DK cpuapp
         NCS base version: 2.5.2
         Cmake run : Thu Feb 22 23:17:43 2024
HL [00:00:00.258,453] <inf> fw_info: ------- DEBUG BUILD -------
HL [00:00:00.258,483] <inf> fw_info: HEADSET left device
HL [00:00:00.269,104] <inf> board_version: Compatible board/HW version found: 1.                                                                                                                                                                                                                               0.0
HL [00:00:00.307,189] <inf> bt_mgmt_ctlr_cfg: Controller: LL_ACS_NRF53. Version:                                                                                                                                                                                                                                3424
HL [00:00:00.309,143] <inf> bt_mgmt: Local identity addr: D0:E9:D3:9B:BE:90 (ran                                                                                                                                                                                                                               dom)
HL [00:00:00.435,729] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random)                                                                                                                                                                                                                               . May time out. Updates not printed
HL [00:00:00.435,729] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:00.439,300] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER f                                                                                                                                                                                                                               ound, id: 0x3b7d61
HL [00:00:00.652,099] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:01.452,056] <inf> broadcast_sink: Syncing to broadcast stream index 0
HL [00:00:01.452,239] <inf> streamctrl_broadcast_sink: Presentation delay 10000                                                                                                                                                                                                                                us is set
HL [00:00:02.252,349] <inf> broadcast_sink: Stream index 0 started
HL [00:00:02.252,349] <inf> broadcast_sink: Codec config for LC3:
HL [00:00:02.252,349] <inf> broadcast_sink:     Frequency: 48000 Hz
HL [00:00:02.252,380] <inf> broadcast_sink:     Frame Duration: 10000 us
HL [00:00:02.252,380] <inf> broadcast_sink:     Octets per frame: 120 (96000 kbp                                                                                                                                                                                                                               s)
HL [00:00:02.252,380] <inf> broadcast_sink:     Frames per SDU: 1
HL [00:00:02.252,410] <inf> broadcast_sink:     Channel allocation: 0x1
HL [00:00:02.253,601] <wrn> le_audio_rx: Not in streaming state, throwing data:                                                                                                                                                                                                                                1
HL [00:00:02.264,038] <inf> audio_datapath: Drft comp state: CALIB
HL [00:00:02.266,021] <wrn> audio_datapath: Data received, total underruns: 2

HL [00:00:02.364,013] <inf> audio_datapath: Drft comp state: OFFSET
HL [00:00:02.586,822] <wrn> audio_datapath: Data received, total underruns: 3
HL [00:00:02.863,708] <inf> audio_datapath: Drft comp state: LOCKED
HL [00:00:02.863,739] <inf> audio_datapath: Pres comp state: MEAS
HL [00:00:02.973,724] <inf> audio_datapath: Pres comp state: WAIT
HL [00:00:03.113,739] <inf> audio_datapath: Pres comp state: INIT
HL [00:00:03.123,748] <inf> audio_datapath: Pres comp state: MEAS
HL [00:00:03.234,405] <inf> audio_datapath: Pres comp state: LOCKED
HL [00:00:16.813,201] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:16.815,277] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:16.815,277] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:16.815,277] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:16.833,007] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:17.052,734] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:17.053,222] <inf> broadcast_sink: Stream stopped by user
HL [00:00:17.053,253] <inf> broadcast_sink: Stream index 0 stopped. Reason: 22
HL [00:00:17.053,588] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:17.055,664] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:17.055,664] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:17.055,694] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:17.058,654] <inf> audio_datapath: Pres comp state: INIT
HL [00:00:17.061,828] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:17.260,528] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:17.260,803] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:17.262,847] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:17.262,878] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:17.262,878] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:17.269,989] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:17.454,193] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:17.454,467] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:17.456,512] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:17.456,512] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:17.456,542] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:17.489,959] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:17.652,770] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:17.653,045] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:17.655,090] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:17.655,090] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:17.655,090] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:17.659,973] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:17.852,783] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:17.853,057] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:17.855,102] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:17.855,102] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:17.855,133] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:17.881,835] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:18.052,795] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:18.053,070] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:18.055,114] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:18.055,114] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:18.055,114] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:18.071,868] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:18.252,807] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:18.253,051] <inf> streamctrl_broadcast_sink: PA sync lost
HL [00:00:18.255,096] <inf> bt_mgmt_scan: Local addr: D0:E9:D3:9B:BE:90 (random). May time out. Updates not printed
HL [00:00:18.255,126] <inf> bt_mgmt_scan: Scanning successfully started
HL [00:00:18.255,126] <inf> streamctrl_broadcast_sink: Restarted scanning for broadcaster
HL [00:00:18.259,979] <inf> bt_mgmt_scan: Broadcast source NRF5340_BROADCASTER found, id: 0x3b7d61
HL [00:00:18.452,819] <inf> streamctrl_broadcast_sink: PA synced
HL [00:00:18.453,063] <inf> streamctrl_broadcast_sink: PA sync lost

What I have done is to install the SDK 2.5.2

add the following lines to my prj.conf

CONFIG_STREAM_BIDIRECTIONAL=n

CONFIG_TRANSPORT_BIS=y

CONFIG_AUDIO_SOURCE_I2S=y

and build everything using the script

py buildprog.py -c both -b debug -d both -p -s --recover_on_fail

Best regards

Chris