Allen Mahurin wrote:

> I have a program that's supposed to multiplex some
> characters across 5 7-segment displays for about a
> second, change to another set of characters for about
> a second, go blank for another second, then repeat.
> What my program *actually* does is show the first set
> of characters and briefly flicker about every second
> or two.  It's like it's resetting itself, and never
> gets to the second set of characters.  I'd like to use
> TMR0 for the 1 second intervals, but didn't fully
> understand how to implement it, so I'm using the
> variable loops.  Do I have an unintentional reset?


Only from the WDT enabled.

        __CONFIG   _CP_OFF & _WDT_ON & _PWRTE_ON & _XT_OSC

Try...

        __CONFIG   _CP_OFF & _WDT_OFF & _PWRTE_ON & _XT_OSC



This type of code is not recommended...

        movwf PortB             ; Now, display the new digit
        bsf PortB,0x07          ; Enable the first display
        call Delay1             ; Brief pause

Try...

        movwf PortB             ; Now, display the new digit
        goto $ + 1              ;  equals 2 NOP's
        bsf PortB,0x07          ; Enable the first display
        call Delay1             ; Brief pause



This is probably your code problem...

Show1:  decfsz Inner            ; Decrement Inner loop
        goto First1             ; Z = 1, enter display routine
        decfsz Outer            ; Z = 0, decrement the Outer loop
        goto First1


Try....

Show1:  decfsz Inner            ; Decrement Inner loop
        goto First1             ; Z = 1, enter display routine

        movlw 0x02              ; Reset the Inner loop
        movwf Inner
        decfsz Outer            ; Z = 0, decrement the Outer loop
        goto First1

In your code, [Inner] never gets reset, so it keeps decrementing to
0xFF, 0xFE etc.

Same for the [Show2:] code lines.

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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