No Audio Output on Picroft with Jabra 410

Archive - Mycroft Project Picroft
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I have a fully operational Pycroft with the latest code released last week and using the
Jabra 410 USB conference speaker/microphone.

Briefly the steps were:

  1. Build a new Pycroft as per https://github.com/MycroftAI/enclosure-picroft/tree/stretch

  2. Run through the first time install wizard as normal.

  3. Reboot.

  4. As this point I had everything working except the speaker.
    (The microphone worked out of the box)

  5. Make the changes as below to DISABLE the onboard BCM2835 speaker
    hardware. This means the Jabra becomes Card 0 and the default.
    (I do plan to work with this further to see if I can leave the hardware
    enabled and change the default to the Jabra as card 1. This is yet to be
    started.

    Your best friend thorough this is the command alsa-info .
    When you run it respond ‘no’ to sending the data to the Alsa team to get
    to the file name containing your configuration details Save this, and refer to it for
    an exact description of your Alsa configuration.

Here are the steps. The steps include commands to cut/paste to run.

#1. Disable BCM2835 overlay from loading at boot time.
#- Edit /boot.config.txt

sudo cp -p /boot/config.txt /boot/config.txt.orig
sudo bash -c 'cat >> /boot/config.txt << __EOF
dtparam=audio=off
__EOF'
more /boot/config.txt
sudo shutdown -r now

#2. Force USB Audio to be card 0 I also forced the snd_bcm2835 to never be card 0 as well
#- Create /etc/modprobe.d/alsa-base.conf

sudo bash -c 'cat > /etc/modprobe.d/alsa-base.conf << __EOF
options snd_usb_audio index=0
options snd_bcm2835 index=-2
__EOF'
more /etc/modprobe.d/alsa-base.conf 
sudo shutdown -r now

#3. Change default to USB
#- Replace /etc/asound.conf

sudo mv /etc/asound.conf /etc/asound.conf.orig
sudo bash -c 'cat > /etc/asound.conf << __EOF
pcm.!default {
  type plug
  slave {
    pcm "hw:0,0"
  }
}

ctl.!default {
    type hw           
    card 0
}
__EOF'
cat /etc/asound.conf

#4. Replace ./audio_setup.sh created by the wizard so set Control 3 (Playback) to card 0

echo 'sudo amixer cset numid=3 "0"  > /dev/null' > ~/audio_setup.sh
echo "amixer set PCM 79%" >> ~/audio_setup.sh
bash ~/audio_setup.sh

#5. Test Output Audio with noise, then WAV files if they are on pycroft
#- First check the speaker volume. Use the -/+ on the Jabra and set it at about 75%
#- (Use control-C to stop if necessary)

cat /dev/urandom | aplay
speaker-test -t wav -c 2 -D hw:0

#6. Test Input Audio with noise (stop mycroft first to release the microphone driver)

mycroft-core/stop-mycroft.sh
cat /dev/urandom | arecord -d 5 /tmp/noise.wav
aplay /tmp/noise.wav

#7. Update /etc/mycroft/mycroft.conf to use the default alsa device.
# Use an editor and change lines 2 and 3 to look like this. ** Sorry no command here.

“play_wav_cmdline”: “aplay %1”,
“play_mp3_cmdline”: “mpg123 %1”,

#The entire default /etc/mycroft/mycroft.conf file shroud now look like:
#- /etc/mycroft/mycroft.conf

{
“play_wav_cmdline”: “aplay %1”,
“play_mp3_cmdline”: “mpg123 %1”,
“enclosure”: {
“platform”: “picroft”
},
“tts”: {
“mimic”: {
“path”: “/home/pi/mycroft-core/mimic/bin/mimic”
}
},
“ipc_path”: “/ramdisk/mycroft/ipc/”
}

#8. Do a final reboot to get everything started in a predictable manner.
sudo shutdown -r now

Hopefully it should all be working for you.

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