pic12F683 Button de-bouncing.

OlPhart · Feb 16, 2012

In the code snippets is the routine I wrote/use. It's absolute, not probabilistic like RC damping is. The active/inactive count values allow tuning to switch type. It's in Freescale assembler, but should have enough comments to understand the logic. I wrote it on having had Way enough trouble with other debounce methods. G.H... <<<)))

lurkepus · Feb 16, 2012

I'm kind of new to PIC's and programming but i'm sure i can figure out the code and be able to adjust it to fitt my needs

be80be · Feb 16, 2012

Mike McLaren wrote this code it really test the switch state

Code:

'
'  swnew  __----____----_________    new sample (positive logic)
'  swold  ___----____----________    switch state latch
'  delta  __-___-___-___-________    changes, press or release
'  newhi  __-_______-____________    filter out "release" bits
'  flags  ___--------____________    toggle flag bits for main
'
Interrupt TMR2_Interrupt(1)        ' 8-msec Timer 2 interrupts
    TMR2IF = 0                     ' clear TMR2 interrupt flag
    swnew = Not PORTB              ' sample active lo switches
    delta = swnew Xor swold        ' changes, press or release
    newhi = delta And swnew        ' filter out "new release" bits
    flags = flags Xor newhi        ' toggle flag bits for main
    swold = swnew                  ' update switch state latch
End Interrupt

alec_t · Feb 16, 2012

Way back in post #10 the OP asked if 1uF across the switch would be ok with a 10k pull-up. IMHO the simple answer is 'yes' (but in the light of the other posts there may be better ways).

Mosaic · Feb 24, 2012

lurkepus said:
I had a look and i'm wondering if it ould be possible to rewrite the code so i can use it on a 12f683 .. i won't be using that many switches but i would need 2 or 3..

I guess i will need the pic to recodt the button state and continue operations , i haev looked for example files but i haven't found any..

The code is asm, u don't have to rewrite anything. Whether u want 2 or 3 or 8 switches the code is the same and the execution is the same. Note the commented out lines in the beginning that show how to assign a switch on any pin to a 8 bit byte for parallel processing of up to 8 switches.

pic12F683 Button de-bouncing.

OlPhart

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Mosaic

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pic12F683 Button de-bouncing.

OlPhart

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