"Olin Lathrop" <olin_piclist@EMBEDINC.COM> wrote:

> > I have two incf instructions:
> >  movf baasaadress,w
> >  movwf FSR
> >  incf FSR,f
> >  incf FSR,f
> >
> > In simulator everything is well, but in action it seems that FSR
> > is increased only once. Is it possible that two incf instructions
> > in succession can result only one increase?
>
> So unlikely it's not worth considering.  There is something else
> wrong. Until you believe that you won't be able to find and fix it.
> Is the bank set properly when fetching BAASAADRESS?

    I'd suspect incomplete simulation, not a bank-setting issue.  I
    imagine that the code's being simulated by manually putting a
    number in baasaadress, then running the four lines above.  Maybe
    some small portion of the code above this four-line fragment is
    being simulated, but in any case, a complete simulation from
    power-on reset isn't being performed.

    In the real system, of course, there are thousands or millions of
    instructions that execute before these four.  If I had to guess
    at the root cause of the problem, I'd say that at the start of
    these four lines, baasaadress already contains a value that's one
    less than expected, and that if a true simulation from power-up
    were performed, the conclusion would not be "in simulator
    everything is well."

    -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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