Can I use any GPIO pin that I'm not currently using? (E.g. the LCD pins.) In terms of hardware, how should I prepare the pins I choose?
For example, page 22 of the reference manual says that "to disconnect with function block" pin
PC14 I need to "remove R84". What does "disconnect with function block" mean? How should I remove resistors from the board? (Those are not detachable like the jumpers.)