Hmm, still no luck. I tried matching the mixer settings from that linked forum post but had the same issue:

pi@raspberrypi:~ $ aplay loop.wav
Playing WAVE 'loop.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

aplay: pcm_write:2053: write error: Input/output error

Here's the amixer output:

Simple mixer control 'Master',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 121 [95%] [0.00dB]
Front Right: Playback 121 [95%] [0.00dB]
Simple mixer control 'Master Playback ZC',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [off]
Front Right: Playback [off]
Simple mixer control 'Sidetone',0
Capabilities: pvolume pvolume-joined
Playback channels: Mono
Limits: Playback 0 - 3
Mono: Playback 0 [0%] [-15.00dB]
Simple mixer control 'Line',0
Capabilities: cswitch
Capture channels: Front Left - Front Right
Front Left: Capture [on]
Front Right: Capture [on]
Simple mixer control 'Mic',0
Capabilities: cswitch cswitch-joined
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Mic Boost',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 1
Mono: 1 [100%] [20.00dB]
Simple mixer control 'Playback Deemphasis',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Capture',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 23 [74%] [0.00dB]
Front Right: Capture 23 [74%] [0.00dB]
Simple mixer control 'ADC High Pass Filter',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Input Mux',0
Capabilities: enum
Items: 'Line In' 'Mic'
Item0: 'Mic'
Simple mixer control 'Output Mixer HiFi',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Output Mixer Line Bypass',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Output Mixer Mic Sidetone',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Store DC Offset',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]

On Sun, Oct 18, 2020 at 1:32 PM Matt <matt@audioinjector.net> wrote:

Hi Ian,

On 18/10/20 10:00 am, Ian McKellar via People wrote:

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

Good news, this last line indicates that the sound card is setup in software and ready to go.

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!

This dmesg error isn't related to the soundcard, it is related to the Pi's I2S driver.

Any ideas? Might I have done a terrible job soldering the pin socket?

Have you toggled the setting in alsamixer which enables the output mixer hifi ? You can read about it on our old forum :

http://forum.audioinjector.net/viewtopic.php@t=5.html#p7

thanks

Matt
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