David V. Fansler <DFansler@mindspring.com> wrote:

> Any one have a better idea, or has anyone done string copying in
> assembler before?

David:

If you're copying a string that starts at SOURCE to a location called
DEST, you can eliminate the need for temporary storage of the FSR by
doing this:

1.  Point FSR at SOURCE.
2.  Read INDF and store in a temp location.
3.  Check for EOS, exit if necessary.
4.  FSR = FSR + (DEST-SOURCE).
5.  Read TEMP locvation and write it to INDF.
6.  FSR = FSR + (SOURCE-DEST).
7.  Loop back to 2.

-Andy

=== Andrew Warren -- aiw@cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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