Steve Hardy <PICLIST@MITVMA.MIT.EDU> wrote:

> How about the following untested macro for general calls.  No doubt
> Andrew Warren et al. have something similar in their web pages, but
> this is my 5 cents worth
> ....
> ; Expands to 1 or 3 instructions, depending on whether cross-block
> ; call.
>
>     [ .... "BSF/BCF PCLATH,3" macro deleted .... ]

Steve:

As a matter of fact, I DO have something similar, but I was surprised
to discover that it's not on my web page.  It IS, however, included
in Tom Kellett's excellent PIC FAQ, at:

    http://digiserve.com/takdesign/pic-faq/routines/pic_5102.html

That routine is for the 16C57 specifically, since it was the only PIC
with multiple code-pages in 1992.  If you take a look at it, you'll
see the sort of hoops one had to jump through back then... The only
available assembler (PICALC) had terrible problems with unresolved
forward references, so a simple "IF/ENDIF" macro like yours wouldn't
work.  Instead, you had to build the BSF/BCF instructions "by hand".
Take a look; it'll make you REALLY appreciate the work Kim Cooper did
on MPASM.

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com                 ===
=== Fast Forward Engineering - Vista, California          ===
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