Difference between revisions of "Zero/hardware/audio"

Latest revision as of 13:16, 3 March 2022

Radxa Zero > Hardware > Audio

USB Audio

Due to space constraint, Radxa Zero does not have a 3.5mm headphone jack for audio output. To get audio output from Radxa Zero, the easiest way is to connect to a HDMI soundbar*. Alternatively you can connect to a USB sound card. Or even better, a USB speaker, which has integrated USB sound card inside. In this guide we will show you how to play sound on your USB speaker using Radxa Zero.

Note: currently the HDMI audio is not working out-of-box on our official image. You will need to manually install this package to have it working. We will add it to our official image in a later time once we know the package won't negatively affect existing users.

Please connect your hardware in following way:

Type-A USB speaker --- Type-C to Type-A USB Hub --- Radxa Zero

In a terminal window on Zero, we will first run aplay -l to check card id for our USB speaker.

root@zero:/home/rock# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: RADXAZERO [RADXA-ZERO], device 0: fe.dai-link-0 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: RADXAZERO [RADXA-ZERO], device 1: fe.dai-link-1 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: RADXAZERO [RADXA-ZERO], device 2: fe.dai-link-2 (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: CD002 [CD002], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Once you identify your USB speaker, edit /etc/asound.conf to set it as the default output:

root@zero:/home/rock# cat /etc/asound.conf 
pcm.!default {
  type hw
  card 1
}

ctl.!default {
  type hw
  card 1
}

You can now test your speaker by playing some sound with mplay or aplay:

root@zero:/home/rock# mplay test.wav

or

root@zero:/home/rock# aplay -Dhw:1,0 test.wav