Phil wrote:

>On Mon, 17 Nov 2003 21:54, you wrote:
>
>
>>Hi Phil,
>>So far, so good.
>>
>>
>>
>>>Start           btfsc   PORTA, 1                ;wait for a.1 to ground
>>>               goto            Start
>>>
>>>               movlw   04h                     ;Turn on the LED
>>>               movwf   PORTA
>>>
>>>               goto            Start
>>>
>>>
>>OK, change it to this:
>>
>>start:          btfss   PORTA,1                 ;is RA.1 high?
>>                goto    sw_low                  ;no
>>                movlw   04h                     ;yes
>>                movwf   PORTA                   ;turn LED on
>>                goto    start                   ;
>>
>>sw_low:         clrf    PORTA                   ;turn LED off (this is the
>>step you forgot!) goto    start                   ;
>>
>>
>>
>
>Thank you for the help so far. Unfortunately now the LED does not turn on, the
>reverse of what I had originally.
>
>I had, and still have a 10k pull-up resistor connected to pin 18 (RA 1) and
>have added "org 0" to the source file. Powering up the PIC with pin 18 in a
>high or low state has no effect, just as grounding the pin after power-up has
>no effect.
>
>I'm still missing something and I'm sure it's something basic. Maybe something
>to do with power-on reset?
>
>

What pin is the LED hooked up to?
David...

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David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
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