Thanks for the advice Tony.  I tried what you suggested still with no luck
though.  I set porta to all outputs and changed the goto statement.  I
originally had the values for the counters set at 0xff (255) but changed
them so I could step through the program in MPLAB without having to press
the step button 512 times.  I know the polarity on the LEDs are correct as
I just checked them by connecting a 330 Ohm resistor to one of them and it
lit up.  I even tried a much more simple program where I moved 0xff into
the work register then moved that value into portb, then looped
infinitely  with:
loopme  goto loopme

That program didn't work either.  Is it possible I might have burned up
portb somehow?  I assume the PIC would still allow itself to be programmed
even if a port was burned up, would it not?  Thanks again.

Sincerely,
Scott Pierce



At 10:18 AM 8/26/2002 +1000, you wrote:
>Scott Pierce wrote:
>
>Don't forget PORTA works even though you are not using it. The inputs
>will float if left as unconnected inputs, so set them as outputs to keep
>the chip happy.
>
> > start   movlw   0x00
>           tris    porta   ;<<<<< ADDED
> >         tris    portb   ;set portb to all outputs
> >         movlw   0xff    ;set portb high
> >         movwf   portb   ;set portb to all 0's
> >         clrf    counti  ;set counti to 0
> >         clrf    countj  ;set countj to 0
> >         clrf    count   ;set count  to 0
> > ;
> >
> ;==============================================================================
> > ;
> > dispcnt movf    count,w ;move contents of count into work register
> >         movwf   portb   ;output contents of count to portb
> >         call    pause
> >         incf    count,f ;increment count by one, results stored in file reg
> >         goto    dispcnt ;start loop over again
> > ;
> >
> ;==============================================================================
> > ;
>
>The counter values were not as you say in your comments. You also had
>the delay kept in a permanent loop. The code changes appear below.
>
>
> > pause   movlw   0x0f    ;set counter to 254
>
>          movlw 0xFE      ;set counter to 254
>
> >         movwf   counti  ;move work register to counti file register
> > loadj   movlw   0x0f    ;set countj to 255
>          movlw 0xFF      ;set countj to 255
>
> >         movwf   countj  ;move work register to countj file register
> > decj    decfsz  countj,f;decrement countj, if zero skip next instruction
> >         goto    decj    ;loop decj again until countj = 0
> >         decfsz  counti,f;decrement counti, if zero skip next instruction
>
>          goto    decj   ;loop loadj again until counti = 0
> >         goto    loadj   ;loop loadj again until counti = 0
> >         return          ;when nested loops are done, return to dispcnt loop
>
>
>--
>Best regards
>
>Tony
>
>mICros
>http://www.bubblesoftonline.com
>mailto:sales@bubblesoftonline.com
>
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