I have tried to compile my own firmware, but I do not seem to be able to get it working.
I want to get a third Serial on the RevoMini by sacrificing two PWM outputs (PA0 and PA1).
I tried to modify the hwdef and compiling works, but I do not seem to able to get it working (a connected GPS does not get recognised).
I have attached the original and modified hwdef files. Anyone can help?