Hi,

> Like if I create
> macro PRINT character,iterations
>         default iterations=1         <- How to make this?
>         <code to print character iterations of times>
>         endm
>
> So if i call it using
>         PRINT 'A',3     ; it will print "AAA"
>         PRINT 'A'       ; it will print "A"
>
> Is it possible to make the assembler compile without all arguments are
> defined, and let the macro detect and act on missing arguments? Like this:
> (Following macro loads a literal to W and optionally stores it in one or
> two registers)
> LL      macro literal,r1,r2  ;macro name L_oad L_iteral
>         movlw literal
>         if not defined r1 exitm   <- How to make this?
>         movwf r1
>         if not defined r1 exitm   <- How to make this?
>         movwf r2
>         endm
>
> Invocations:
>         LL ff,ADTMRL,ADTMRH             ;sets PIC14000 A/D timer to max.
>         LL 0F,PORTA                     ;sets PORTS...
>         LL 24,PORTB                     ;
>         LL e0                           ;=movlw e0
>
I think this will work:
LL      macro literal,r1,r2
          movlw literal
          ifdef r1
            movwf r1    ;Do only if r1 is defined
          endif
          ifdef r2
            movwf r2    ;Do only if r2 is defined
          endif
        endm

Invocations:
        LL 0fh, PORTA,
        or
        LL 10,,

You need to specify three parameters, always.  Even if they are empty -
hence the commas.

Your furst example might be done like this:

macro PRINT character,iterations
        ifndef iterations
          iterations=1
        endif
        <code to print character iterations of times>
        endm

Calling:
        PRINT 'A',3     ; it will print "AAA"
        PRINT 'A',      ; it will print "A"


Hope this helps!
Niki