Hi,

Are you using linker or absolute code? Generally it is not a good idea
to mix the two, and I think you would better go with linker. Then you
can modify the linker script and can define a section as 'protected'
for the table and your ordinary code into the first page.
Alternatively you can use something like:

bigtable    code    0x800

Tamas



On Mon, Feb 1, 2010 at 7:45 PM, Brendan Gillatt
<brendan@brendangillatt.co.uk> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hello,
> I have a gigantic data table stored in Flash memory on a PIC16F1936:-
> greater than 3K words arranged as a series of dt statements. I'm using
> the INDFn registers and MOVIW instructions to access the data so it
> doesn't really matter where it is placed for it to still work.
>
> When I link together the various relocatable modules in my code some end
> up before and some after the data table.
>
> The problem is that I have to use PAGESEL to jump to those bits of code
> after the table. I know that all of my code will fit in the first page,
> and speed is important in this application, so I would rather avoid
> PAGESEL altogether and have all the executable code in the first page and
> lump the table anywhere on the end.
>
> For fairly obvious reasons I would rather not specify exactly where every
> module resides in memory but still some how force the linker to place the
> table afterwards.
>
> I have tried to specify where to place the table by absolutely
> positioning it in memory:
>
> TABLE_SECTION =A0 CODE =A0 =A00x800
>
> BIGTABLE =A0 =A0 =A0 =A0dt =A0 =A0 =A00x00, 0x01, 0x00, 0x02
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0dt =A0 =A0 =A00x01, 0x31, 0x00, 0x42
>
> etc...
>
> However this doesn't change the link order--it still puts the same code
> modules after the table (just shifted even further up the Flash)
>
> Am I missing something obvious or is there really no way around this issu=
e?
>
> I'm using "MPASMWIN.exe v5.35, mplink.exe v4.35" with MPLAB v8.43 and the
> standard linker file.
>
> Thank you very much if you can help.
>
>
> - --
> Brendan Gillatt | GPG Key: 0xBF6A0D94
> brendan {a} brendangillatt (dot) co (dot) uk
> http://www.brendangillatt.co.uk
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-- =

/* www.mcuhobby.com */ int main() { char *a,*s,*q; printf(s=3D"/*
www.mcuhobby.com */ int main() { char *a,*s,*q; printf(s=3D%s%s%s,
q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }

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