I need help in order to implement a bi-directional parallel interface to be able to communicate with a PC program.
I use ATmega128 @ 7.3728MHz. I do have 8 pins reserved for data lines (Data0...Data7 on PORTA) and also I reserved 7 lines for control signals on PORTC (no problem if some of these will be left used, it would be just better). Unfortunately, none of this signals corresponds to an external interrupt of AVR :-( ... But, that's life: you can't have everything you want.
Thx in advance!