I am creating a general macro for sending messages to an LCD display, and
have run into a problem.

Here's my code:

    clrf    counter
disloop    incf    counter,1    ;get next character position from table
    movf    counter,0    ;put char position into W
    call    mess2    ;get the character
    movwf    datalines    ;send it to lcd
    ;         housekeeping for LCD snipped
    comf    datalines,0    ;end of table has 0xff marker, so I complement it
and check for zero
    btfsc status, z    ;complemented character = 0?
    goto    exitaddr    ;yes, done
    goto    disloop    ;no, not done, get next character.
exitaddr                ;continue on
mess2    addwf    pc,1
    retlw    'H'
    retlw    'I'
    retlw    0xff

The code does not take the branch to exit.  As I read the spec sheet, the
comf command should set the z flag if the result is zero (ie, datalines
contained 0xff before the comf command).

What am I doing wrong?

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