Matrix Keypad routine

[fratello]

Thanks for support , Mr.Henrik !
What I want :
- porta.x = ON while correspondent button.x is pressed.
How work :
- press button x ; do nothing ; release button x - porta.x=ON ; remain ON while press ANOTHER button(say y) ...But this new button(y) don't turn correspondent porta.y ON ; just turn OFF previous porta.x ; only after the release of the second press turn on correspondent porta.y...