I bought an AudioInjector Zero and I can't get it to work on the hardware I have.
I believe I have it configured correctly. I'm running Linux 5.4.70-v7+ and have
dtparam=i2c_arm=on
dtparam=i2s=on
dtoverlay=audioinjector-wm8731-audio
in /boot/config.txt
During boot dmesg gets:
[ 8.939739] audioinjector-stereo soc:sound: ASoC: failed to init link AudioInjector audio: -517
[ 8.939762] audioinjector-stereo soc:sound: snd_soc_register_card failed (-517)
[ 9.295473] audioinjector-stereo soc:sound: ASoC: failed to init link AudioInjector audio: -517
[ 9.295496] audioinjector-stereo soc:sound: snd_soc_register_card failed (-517)
[ 9.330667] audioinjector-stereo soc:sound: ASoC: failed to init link AudioInjector audio: -517
[ 9.330692] audioinjector-stereo soc:sound: snd_soc_register_card failed (-517)
[ 10.051168] wm8731 1-001a: Assuming static MCLK
[ 10.051223] wm8731 1-001a: 1-001a supply AVDD not found, using dummy regulator
[ 10.051357] wm8731 1-001a: 1-001a supply HPVDD not found, using dummy regulator
[ 10.051452] wm8731 1-001a: 1-001a supply DCVDD not found, using dummy regulator
[ 10.051574] wm8731 1-001a: 1-001a supply DBVDD not found, using dummy regulator
[ 10.067882] audioinjector-stereo soc:sound: wm8731-hifi <-> 3f203000.i2s mapping ok
But when I try to play something, eg: aplay /usr/share/sounds/alsa/Noise.wav
it hangs and doesn't appear to be actually playing anything. Also dmesg gets:
[ 224.002383] bcm2835-i2s 3f203000.i2s: I2S SYNC error!
Any ideas? Might I have done a terrible job soldering the pin socket?