Oscillo - readings not clear to me

[sougata]

Hi,

PBP takes care of your button debouncing problem. Use the BUTTON function. Besides debouncing it also does some neat autorepeat for you when use it in a loop.

[mister_e]

The oscillo trace show you exactly what is suppose to happen with any mechanical push-button.

theory and explanation bellow
http://www.elexp.com/t_bounc.htm

Solution... there's many different. Using PBP BUTTON command, use Timers interrupts, OR use a simple loop

PushButtonA VAR PORTA.0
'
'
'
'
IF PORTA.0=1 THEN
    ' Do your Stuff
    '
    WHILE PORTA.0=1 : Wend ' wait untill push button is release
    PAUSE 50 ' Debounce delay
    ENDIF

[flotulopex]

Good information.

If I don't like to use the BUTTON command or WHILE/WEND artifices, it's because of this short pause that has to be artificially created to avoir the bouncing.

It sounds silly but I like to hear the button's "click" and see the display (or LED or any other action) react at the same time.

Instead of waiting for the button to debounce, wouldn't there be a solution to use the only the very first raising/falling edge of the signal and make the PIC ignore the following pulses for some milliseconds meanwhile it exectues the program?

[mister_e]

Well, that's what my previous example did?

It read the Button, then 'Do your Stuff' And wait untill you release the button. then debounce it.

If you released the Button before your 'Stuff' is executed, it will just execute the PAUSE 50. No harm at all.