My best guess is that your problem is caused because bytes of flash in a =
18F series PIC are stored in 2 byte sections. For example, each instructi=
on takes either 2 or 4 bytes of code space.  I don=E2=80=99t have any rea=
l experience with gpasm or with db so I haven=E2=80=99t experienced this =
problem before.  As far as "code pack" it could possibly combine two 1 by=
te db together.

Nathan Thomsen=20

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf =
Of Jan Wagemakers
Sent: Thursday, April 28, 2005 6:45 PM
To: piclist@mit.edu
Subject: [PIC] db : odd number of expressions, last byte will be zero

Hello,

I have a problem with a PIC18f452 program. It is written in asm and I mak=
e
use of gpasm (0.13.1).

The problem is that when I use a "db" line with an odd number of
expressions, a extra byte with value 0 will be added. According to the
documentation(*1) that I have read this is normal behavior. I have also r=
ead
that it is possible to disable this feature with "code_pack".

However, When I try to use "code_pack" it doesn't seems to work (maybe gp=
asm
doesn't understand "code_pack"?).

My questions:
1. Does gpasm understand "code_pack" and if yes, how do I use it?
   (google for "gpasm code_pack" gives me no results)
2. Is there some other method that I can use to disable this 'feature'?


(*1)
| 5.13 DB =EF=BF=BD Declare Data of One Byte
|
|    5.13.1 Syntax
|
|           [<label>] db <expr>[,<expr>,...,<expr>]
|
|    5.13.2 Description
|
|           Reserve program memory words with packed 8-bit values. Multip=
le
|           expressions continue to fill bytes consecutively until the en=
d
|           of expressions. Should there be an odd number of expressions,
|           the last byte will be zero. When generating an object file,
|           this directive can also be used to declare initialized data
|           values. Refer to the IDATA directive for more information.


--=20
Met vriendelijke groetjes         - Jan Wagemakers -

... RFS: picprog: Microchip PIC serial programmer software (GPL)
    Deb-package is available at <http://www.janw.easynet.be/picprog.html>
   =20

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