Skywriter HAT + Arduino

To expand, I found the interrupts weren't working until I switched in the example code (SkywriterInterrupt.ino) from

attachInterrupt(PIN_TRFR,poll,FALLING);

where-ever mentioned to

attachInterrupt(digitalPinToInterrupt(PIN_TRFR),poll,FALLING);

I've also proven via serial print outs that I am, after this change, executing the interrupts, but the board locks up on Skywriter.poll();