solved it.
using udata_acs and bancsel
Lembit
----- Original Message ----- 
From: "Lembit Soobik" <lembit.piclist@t-online.de>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, September 19, 2006 4:07 PM
Subject: [PIC] 18F4520 - Global variable


>I have a program working which reads telegrams from a bus and displays some
> info on an LCD.
> The program is split on 3 files:
> - Main
> - Bus (receiving telegrams)
> - LCD control
>
> there are variables defined in each part. Some are globals in each part.
>
> The LCD part has only 4 variables defined (UDATA), one of which is global
> (temp_wr) and is accessed from the Main.
> This global variable contains the data for LCD display (one Byte)
>
> The whole program worked until I added some more variables (in the Bus
> part),
> when the LCD displayed a row of weird characters (C0h)
> Checking the map file, I found that the variables were all in bank 0,
> starting at 080h,
> but when I added more variables, the 4 variables from the LCD part were
> shifted into bank 5,
> starting at 500h.
> Further tests showed that ONLY if the global variable temp_wr is defined 
> in
> the LCD part global
> (and in Main as Extern), AND it is in bank 5, it shows that problem.
> If however I put the same variable into Main as global and use it in LCD
> (Extern), it works fine, no matter in which bank it is.
>
> Of course I can use it this way, but I like to understand what's going 
> wrong
> here.
> Is it bad programming style to define a global variable in other than the
> Main part?
> and yes, I did RTFM, but did not find a relevant hint.
>
> Thank you all for any help
> Lembit
>
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