Download a clean Raspbian Lite image from raspberrypi.org and flash it to an SD card.
For the HiFiBerry DAC+ to work we'll disable the onboard sound driver by commenting out the line
dtparam=audio=on
from /boot/config.txt if it exists. And then add this line to load the DAC+ driver instead.
dtoverlay=hifiberry-dacplus
More information on configuring the HiFiBerry hats can be found on hifiberry.com.
Create an empty file called ssh on the /boot partiotion of the SD card then instert it into the Pi and power it up.
ssh onto the Pi. Username is pi, default password is raspberry.
ssh pi@raspberrypi
Good practive would be to change the default password, to disable root login via SSH and to disable password login via SSH.
Update everything and reboot, then ssh onto the Pi again.
sudo apt-get update
sudo apt-get upgrade
sudo reboot
Test that the HiFiBerry DAC+ is available for use. Running aplay -l should give an output similar to this:
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ Pro HiFi pcm512x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
Install the bluetooth audio module for pulse along with pulse itself and ofono.
sudo apt-get install pulseaudio-module-bluetooth ofono
Edit the bluetooth config /etc/bluetooth/main.conf. You want to change the Class to 0x00041C. And make sure that AutoEnable is set to true
Class = 0x00041C
AutoEnable = true
Continue with editing the pulse configuration. We'll start pulse with the system so go for /etc/pulse/system.pa and add the following lines.
load-module module-bluetooth-discover
load-module module-bluetooth-policy
load-module module-switch-on-connect
Then add a systemd service that automatically starts pulse on boot.
sudo nano /etc/systemd/system/pulseaudio.service
You can use this snippet. Depending on the other tasks your Pi has to do, you may want to adjust the resampling method and cpu limit. Consult man pulse-daemon.conf for more information.
[Unit]
Description=PulseAudio Daemon
[Install]
WantedBy=multi-user.target
[Service]
Type=simple
PrivateTmp=true
ExecStart=/usr/bin/pulseaudio --system --realtime --disallow-exit --no-cpu-limit --exit-idle-time=-1 --resample-method=speex-float-9
Enable the new service so it is run on boot.
sudo systemctl enable pulseaudio
We need to make sure that pulse has permissions to use bluetooth and ofono. Edit /etc/dbus-1/system.d/bluetooth.conf and add the following policy:
<policy user="pulse">
<allow send_destination="org.bluez"/>
<allow send_destination="org.ofono"/>
</policy>Finally do a reboot because why not.
sudo reboot
To connect a device do the following in a sudo bluetoothctl
pairable on
discoverable on
Discover and pair the device using your A2DP source. The device will most likely connect and immediately disconnect again like this:
[CHG] Device FC:18:AA:BB:CC:DD Connected: yes
[CHG] Device FC:18:AA:BB:CC:DD Connected: no
Trust the device like so and you should be good to go.
trust FC:18:AA:BB:CC:DD
To automatically reconnect the device when the Pi boots up you can set up another system service. Open sudo nano /etc/systemd/system/autoconnect.service and add this snippet:
[Unit]
Description=Autoconnect
After=multi-user.target
[Service]
Type=idle
ExecStart=bluetoothctl -- connect FC:18:AA:BB:CC:DD
[Install]
WantedBy=multi-user.target
And enable it running sudo systemctl enable autoconnect.service.
Automatic discovery and paring/trusting is not super easy and requires some scripting.
https://wiki.archlinux.org/index.php/Bluetooth_headset
https://www.hifiberry.com/build/documentation/configuring-linux-3-18-x/
https://bugzilla.redhat.com/show_bug.cgi?id=514992
https://linux.die.net/man/5/pulse-daemon.conf
https://gist.github.com/kingster/3784fa2f0de1f5ce4418
https://pythonhosted.org/BT-Manager/config.html
https://stackoverflow.com/questions/34709583/bluetoothctl-set-passkey