topic Re: How to use the Bluetooth PCM interface in i.MX Processors

How to use the Bluetooth PCM interface

hu_yougang — Tue, 07 Jan 2020 01:46:54 GMT

Hi, I am working with imx8mmevk on yocto project

I want to know how to use bluetooth PCM,because when use bluetooth a2dp,the pcm no signal

Re: How to use the Bluetooth PCM interface

igorpadykov — Tue, 07 Jan 2020 23:24:25 GMT

Hi yougang

one can look at

https://community.nxp.com/thread/513039

Best regards
igor
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Re: How to use the Bluetooth PCM interface

hu_yougang — Wed, 08 Jan 2020 02:51:45 GMT

hi igorpadykov

Thank you for your reply, bluetooth a2dp uses uart to transfer audio data.If we want to use the PCM interface to transmit audio data,how to modify?

Re: How to use the Bluetooth PCM interface

igorpadykov — Thu, 09 Jan 2020 01:18:11 GMT

one can look at

BCM4343W bluetooth audio PCM driver | Cypress Developer Community

AN214937 Bluetooth Audio Over I2S

https://www.cypress.com/file/298666/download

Best regards
igor

Re: How to use the Bluetooth PCM interface

Nivas_Pangarkar — Tue, 04 Feb 2025 07:18:04 GMT

Hi,
I have bluealsa service running on yocto linux and able to connect bluetooth earphone. I can able to play and record using below mantioned commands,

aplay -D bluealsa:SRV=org.bluealsa,DEV=xx:xx:xx:xx:xx:xx,PROFILE=a2dp /usr/share/sounds/alsa/Front_Center.wav
arecord -D bluealsa:xx:xx:xx:xx:xx:xx,sco -d 5 test.wav

While recording/playing audio i'm not getting any signals on PCM lines, but on uart. How can I test PCM (want to check singals on PCM lines)?

Note:
this is what /usr/lib/systemd/system/bluealsa.service have (logs are trimmed)

# cat /usr/lib/systemd/system/bluealsa.service
.
.
.
ExecStart=/usr/bin/bluealsa -p a2dp-source -p a2dp-sink -p hfp-hf -p hfp-ag -p hsp-hs
.
.
.

and this is output of bluealsa-aplay -l

# bluealsa-aplay -l
**** List of PLAYBACK Bluetooth Devices ****
hci0: A4:05:6E:32:FB:BA [realme Buds Wireless 2], trusted audio-headset
A2DP (SBC): S16_LE 2 channels 48000 Hz
SCO (CVSD): S16_LE 1 channel 8000 Hz
**** List of CAPTURE Bluetooth Devices ****
hci0: A4:05:6E:32:FB:BA [realme Buds Wireless 2], trusted audio-headset
SCO (CVSD): S16_LE 1 channel 8000 Hz