NXP Semiconductors UM11490 - Page 54

NXP Semiconductors
UM11490
Feature Configuration Guide for NXP-based Wireless Modules on i.MX 8M Quad EVK
Copy the sample audio file to i.MX 8M Quad
Use the following command to check the available sink cards:
root@imx8mqevk:~# pacmd list-sinks | egrep '(index|name):'
index: 0
name: <alsa_output.platform-sound-bt-sco.mono-fallback>
index: 1
name: <alsa_output.platform-sound-spdif.stereo-fallback>
* index: 2
name: <alsa_output.platform-sound-wm8524.stereo-fallback>
index: 3
name: <bluez_sink.7C_2E_BD_48_15_FC.a2dp_sink>
root@imx8mqevk:~#
Select the Bluetooth speaker as an audio sink device
root@imx8mqevk:~# pacmd set-default-sink 3
root@imx8mqevk:~# pacmd list-sinks | egrep '(index|name):'
index: 0
name: <alsa_output.platform-sound-bt-sco.mono-fallback>
index: 1
name: <alsa_output.platform-sound-spdif.stereo-fallback>
index: 2
name: <alsa_output.platform-sound-wm8524.stereo-fallback>
* index: 3
name: <bluez_sink.7C_2E_BD_48_15_FC.a2dp_sink>
root@imx8mqevk:~#
Play the audio file using pulseaudio play utility
root@imx8mqevk:~# paplay <path to audio file>/sample_audio.wav &
[3] 562
[2] Done(1) paplay /usr/local/sample_audio.wav
root@imx8mqevk:~#
Set the volume of sink device using pulseaudio commands
Here, 0 is muted and 0x10000 is normal volume.
root@imx8mqevk:~# pacmd set-sink-volume <sink_index> <volume_level>
root@imx8mqevk:~# pacmd set-sink-volume 3 0x9000
Disconnect the device using Bluetoothctl command line interface
root@imx8mqevk:~# bluetoothctl
Agent registered
[Office speaker 1]# disconnect 7C:2E:BD:48:15:FC
Attempting to disconnect from 7C:2E:BD:48:15:FC
[CHG] Device 7C:2E:BD:48:15:FC ServicesResolved: no
Successful disconnected
[CHG] Device 7C:2E:BD:48:15:FC Connected: no
[bluetooth]#
UM11490 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 2 — 29 January 2021
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