Tons of buttons and debouncing

i working on project driver using gigantic matrix of inputs on racing simulator. @ stage, have 25 inputs using 10 pins. code looks lie this:

code: [select]


if (pina == high)
     if (pin1 == high)
          button 1 pressed
     if (pin2 == high)
          button 2 pressed
if (pinb == high)
     if (pin1 == high)
          button 3 pressed

etc


what best way debounce these? have seen plenty examples 1 or 2 buttons debounced, 25+ buttons. buttons have not measure bounce @ on oscilloscope, imagine practice anyways.

your input appreciated.

best?
simplest, read switches every 50 ms.


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