I had piardopc working with arim on the original UDRC & UDRC II hats
about a year ago. Should work with DRAWS hat as well.
Set you gpio depending on which mDin6 connector you are using.
For a DRAWS hat left = gpio 12, right = gpio 23. Make sure that direwolf
is NOT running.
Command line I used:
./piardopc 8515 plughw:1,0 plughw:1,0 -p GPIO=23
Added this to .asoundrc
I found that using arim was useful in getting piardopc going because of
its debug facilities.