This repo has code for AVR to implement the user interface controls for a Teensy 4 based synth
T4 itself does not have many pins (and quite a few are involved in the audio interface so the original plan was to use port multiplexers but this still injected a lot of noise to Tiny and was cumbersome - so mop all the IO up with a 40 pin AVR.
The first thought was to use mega32 (because I had one) but then I considered mega1284P simply because i had a Mega1284P-Xplained board at hand but I may revert to mega32 in fact.
Rather curiously I decided to dabble in C++ for this. I quite like the way the Button, Encoder, DualJoystick classes turned out so far.
Oh and to help me connect up the mega32 I produced this label to stick onto the chip (print to be 51mm long)...
