10)
Checking audio is working through the IQaudIO sound card
Once support is active using devicetree you should now be able to listen to music.
•
Once the Raspberry Pi boots, log in and check that the IQaudIO board is visible as an ALSA
audio card by running aplay –l, the output should be similar to that below. Note the device number
and subdevice number – these may be useful to you when configuring media applications to access
the sound card in your system.
pi@iqaudio ~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: IQaudIODAC [IQaudIODAC], device 0: IQaudIO DAC HiFi pcm512x-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0
•
Check that you can adjust the volume. From the Raspberry Pi run alsamixer. If you have more than
one sound card installed you may have to select which is being controlled by pressing the F6 key.
pi@raspberrypi ~ $ alsamixer
!
Now adjust the volume by highlighting “Digital” (Press your cursor keys left and right to select) and
increase / decrease the volume by pressing your up and down cursor keys. Remember 100% = 0db,
0% is mute!
NOTE: Both mixers ANALOGUE and ANALOGUE PLAYBACK BOOST should be set to 100%
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