Complete Keypad Example

[RAYMON]

Hello

Here another program which uses another technique for the keypad, can help me has to write a routine or have an idea. my program does not have constrained foncionnement of the program has to supervise.

thank you

start:
pcode=0

clavier:
porta.2=0
trisb=%11110000 '0=out / 1=in
portb=%00000000
pause 10 'Let stabilize state
msb=portb
if msb=240 then 'No key pressed
goto clavier
endif

TRISB=%00001111 '0=out / 1=in
portb=%00000000
pause 10 'Let stabilize state
lsb=portb
if lsb=15 then 'Key is already released
goto clavier
endif
pause 100 'Enable one key press each 500ms

msblsb=msb + lsb 'Combine line & column

[Acetronics2]

Hi, Raymon

There's a little problem in your goal definition ...

you want to know what happens on EVERY keyboard ...

BUT ...

1) you have different key counts
2) you have "matrix" and "common" keyboard architecture ... plus a "diode" architecture that permits 56 keys instead of the classical 16 ones ( using a full port ...), plus the Key to resistance value system ...,plus ...

3) you have "digital" outputs and "serial" outputs ( like a PC keyboard ) ...

Reading what happens won't be the same manner for each keyboard ...

so ... I think you should , at first have a better definition of what you REALLY want to do ...

If you wanna paste Keyboard scanners ( like in Hollywood films ... i.e. ) ... think first it's ONLY movies ... really, really far from the reality !!!

1 Keyboard type = 1 Scanner type ... That's it !!!

Amitiés du 76

Alain