Sound card driver for Nabaztag and Nabaztag:tag Raspberry Pi HAT "Tagtagtag" 2019 card, v4.3 featuring:
- a WM8960 codec driving Nabaztag's 8Ω mono speaker on right output
- a MAX9759ETE+T amplifier plugged on WM8960's headphone output (merging left and right) and driving Nabaztag:tag's 4Ω speaker, controlled by GPIOs 7 (/SHDN) and 8 (/MUTE)
- a line out plug detect on GPIO 25 (Nabaztag:tag only, and if user actually plugged line out)
- a physical volume button on GPIO 22 and 27.
WM8960 codec is based from linux codec from d2912cb15bdda8ba4a5dd73396ad62641af2f520 commit of wm8960.c and wm8960.h files.
Compared to upstream, the codec driver configures clocking in slave mode and made compatible with simple-audio-card.
MAX9759 codec has been patched to make gain GPIOs optional.
Volume button is handled by an additional driver exposing GPIOs as ALSA switches. Line-out and volume button are handled by a separate daemon that modifies sound volumes.
- WM8960: https://statics.cirrus.com/pubs/proDatasheet/WM8960_v4.4.pdf
- MAX9759ETE+T: https://datasheets.maximintegrated.com/en/ds/MAX9759.pdf
Sound card schematics will be published on https://github.com/nabaztag2018/hardware
Install requirements
sudo apt-get install raspberrypi-kernel-headers libasound2-dev
Clone source code.
git clone -b tagtagtag-sound https://github.com/pguyot/wm8960
Compile and install with
cd wm8960
make
sudo make install
Makefile will automatically edit /boot/config.txt and add/enable if required the following params and overlays:
dtparam=i2c_arm=on
dtoverlay=i2s-mmap
dtparam=i2s=on
dtoverlay=tagtagtag-sound
Makefile will also reset card's ALSA Mixer settings to defaut values.
You might want to review changes before rebooting.
Reboot.
Mixer daemon uses configuration file /var/lib/tagtagtag-sound/mixer.conf.
Any change to this file is taken into account by sending a USR1 signal to the daemon.
The pid is saved to /run/tagtagtag-mixerd.pid