8-bit MicrocontrollersのトピックRe: #pragma.....

#pragma.....

DavidoBG — Wed, 26 Nov 2008 23:12:45 GMT

I have a big structure (sizeof structure "x" equal 0x100). So my RAM equals 0x200!!!! I would like declared this structure on the first page of my flash. Is it possible??

I try to use

#pragma CONST_SEG STRUCT_ZONE_CODE

struct x{

...

....

};

#pragma CONST_SEG DEFAULT

in prm file i added

STRUCT_ZONE = READ_WRITE 0xE000 TO 0xE1FF;

STRUCT_ZONE_CODE INTO STRUCT_ZONE;

But no effect.

Thanks for your help

David

Re: #pragma.....

CompilerGuru — Wed, 26 Nov 2008 23:58:37 GMT

That should work as you tried, apart
(I guess is only because of the code extraction), a variable in C has to have name, otherwise it is just a struct type definition.
Also #pragma CONST_SEG applies to constants, so it should be something similar to:

Code:

#pragma CONST_SEG STRUCT_ZONE_CODEconst struct x {int i;} VarNameOfx;#pragma CONST_SEG DEFAULT

Daniel

Re: #pragma.....

DavidoBG — Thu, 27 Nov 2008 18:57:36 GMT

I try again but not successfull.

But my problem is :

I use MCS08QE8 µC (512 Bytes = RAM) but i have a big structure around 256Bytes. To keep my space RAM, i would like declare my big structure in Flash instead of use RAM.

Is it really possible???

Or What is the method to avoid use always RAM Access to manage variable.

Thanks you

David

Re: #pragma.....

MrBean — Thu, 27 Nov 2008 21:08:07 GMT

As compilerguru says, use the pragma to place a const , not a struct definition, into the SECTION.

Furthermore: i think the .prm line should read:

STRUCT_ZONE = READ_ONLY 0xE000 TO 0xE1FF;

because you cannot simply write to it.

The linker may outsmart you because of the READ_WRITE you used...

You can still re-program the const via flash routines, with the above .prm line

Message Edited by MrBean on 2008-11-27 02:09 PM

Re: #pragma.....

DavidoBG — Thu, 27 Nov 2008 23:00:35 GMT

It's running now!!! Thanks a lot

David