mzero/snd-digitakt.md

## snd-digitakt.md

      
        

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              snd-digitakt.md
            
          
        
      
    
  
    building the linux digitakt usb driver
needed to install
sudo apt install flex bison libssl-dev libncurses5-dev bc

clone kernel sources
cd
mkdir kernel
cd kernel/
git clone --depty=1 --branch raspberrypi-kernel_1.20190819-1 https://github.com/raspberrypi/linux.git
    # branch number needs to match installed version of raspberrypi-kernel

config & prepare
cd ~/kernel/linux
KERNEL=kernel7
make bcm2709_defconfig
    # default for RPi3+ 
    # for other models, see https://www.raspberrypi.org/documentation/linux/kernel/configuring.md
vi .config
    # find the CONFIG_SND_USB section
    # add a line: CONFIG_SND_USB_DIGITAKT=m
make prepare
make scripts

get and copy things from snd-digitakt repo
cd
git clone https://github.com/droelfdroelf/snd-digitakt.git
cd ~/kernel/linux/sound/usb/
cp ~/snd-digitakt/sound/usb/Kconfig .
cd misc
cp ~/snd-digitakt/sound/usb/misc/Makefile .
cp ~/snd-digitakt/sound/usb/misc/digitakt.c .

build
cd ~/kernel/linus/sound/usb/misc
make -C ~/kernel/linux  M=$(pwd) modules
# after this there should be a snd-digitakt.ko file in this directory

install
sudo make -C ~/kernel/linux  M=$(pwd) modules_install
sudo depmod

load into Kernel
sudo modprobe snd-digitakt

test
# connect Digitakt
# put it in Overbridge mode
#       Settings (gear button) > System > USB Config
#       select Overbridge, press Yes
#       select Int to Main, set to Off
aplay -l
arecord -l
    # both commands should list the Digitakt as a card

# start jack
/usr/bin/jackd -R -P 75 -d alsa -d hw:Digitakt -r 48000 -n 2 -p 256 -s &

play through Supercollider
sclang
# following commands are to sclang, not the shell
s.options.numInputBusChannels = 12
s.boot
{ SoundIn.ar([0, 1]); }.play

load it into the kernel