Vlad wrote :

> I'm using a 16f84a to multiplex two common cathode 7-segment displays
> connected to PORTB pins 0-6.
>
> Now, I also  have momentary pushbutton switches connected to
> PORTA pins 2-3,...


1. Use an timer ISR to update the displays regulary.
2. Use the "main" loop to check the keys.
(3. And use a "better" PIC...)

That way, you will get the same brightness whatever the
PIC is doing in it's main loop...

Jan-Erik.
>
>
> the main loop looks this:
>
> main    call display_led
>         call check_button
>         goto main
>
>
> The check_button routine looks like this
>
> check_button    btfss   PORTA,2
>                 return
>                 call    delay           ;deboune (sleep 5ms)
>                 btfss   PORTA,2
>                 return
>                 call    do_something    ;do_something is just
>                                         ;a few clock cycles
>                 return
>
>
> Is my hardware/software design flawed?  What can I do to process user
> input quickly while preventing any dimming on the LEDs?  This seems
> like a common thing and have follwed the wonderful suggestions on this
> list.  I can provide more information like pictures and complete code,
> but I just wanted to feel this out and see if my problem is perhaps
> simply design related
>
>
> Thanks!
> -v
>
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Jan-Erik Svderholm
S:t Anna Data
tel : +46 121 42161
mob : +46 70 5241690

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