Just a quick glimpse thru this, I'm wondering whether the destination on =
the=20
"incf INDF" instruction makes a difference?

Cheers,
-Neil.



On Tuesday 19 August 2003 02:59, Jim Tellier scribbled:
> Sorry guys, I should have said that B1_ARRAY index is "1-based", so Yes=
, it
> is correct that it is the same address as B1_COUNT.
> Another way to say the same thing is that this is a "counted array": th=
e
> 0th element contains the # of entries in the array.  (Of course that on=
ly
> works for 1-based indexing of elements).
> Jim
> ----- Original Message -----
> From: "Ken Pergola" <no_spam@LOCALNET.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Monday, August 18, 2003 5:32 PM
> Subject: Re: [PIC:] Addressing Bank 1 data space
>
> > Hi Jim,
> >
> > Took a quick glance:
> >
> > Are B1_COUNT and B1_ARRAY aliases on purpose (since they are the same
> > location 0xA0) or was that just a typo?
> >
> > Regards,
> >
> > Ken Pergola
> >
> >
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jim Tellier
> > Sent: Monday, August 18, 2003 8:19 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [PIC:] Addressing Bank 1 data space
> >
> >
> > OK, I've got an "interesting" bug-hunt going on, and it's about time =
I
>
> asked
>
> > a couple of sanity-check questions!   I was going to post the entire
> > .asm, but perhaps that's not (yet) necessary... we'll see!
> >
> > Using '16F877.  I've set up a data structure in Bank 1:
> > B1_COUNT     equ     0xA0
> > B1_ARRAY    equ     0xA0
> > B1_OTHERDATA equ   0xC3
> > B1_MOREDATA equ   0xC4
> >
> > ; A method "foo" is called twice by my main program logic.
> > ;
> > foo
> >     banksel    B1_COUNT
> >     ; This is the ONLY reference to B1_COUNT anywhere:
> >     incf    B1_COUNT
> >     movlw    B1_ARRAY
> >      addwf    B1_COUNT, W
> >     movwf    FSR
> >     incf        INDF
> >     return
> >
> > The interrupt service saves and restores FSR (and W, STATUS, PCLATH) =
in
>
> the
>
> > "standard" manner.   (FSR *is* used in the intsvc to store characters
> > received from serial port, but it is set
> > to point to a buffer space in Bank 0).
> >
> > THE PROBLEM: sometime well after "foo" is called (exactly twice), whe=
n I
>
> go
>
> > to read the contents of B1_COUNT.... it's sporadically incorrect!
> > I note that ALL of what I expect to see elsewhere in both Bank 0 and =
Bank
>
> 1
>
> > data space is correct... except for this one address!
> >
> > Is there anything "odd" about what I'm doing?  I can't seem to think =
of
>
> new
>
> > ways to look at this one!
> > (Oh, BTW, this one's not easily simulated, due to the need for RS232 =
and
>
> I2C
>
> > I/O.. :^(
> > Thanks for any helpful thoughts you might have!
> > Jim
> >
> > > --
> > > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> >
> > --
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> >
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