How to define a Data segment, for placing data in Ext. ram?

fa · ‎2006-02-20

Posted on February 21, 2006 at 08:16

fa · ‎2006-02-14

Posted on February 15, 2006 at 04:27

I am using the IAR compiler..

I have an External RAM where I want to place only certain data..

I think I have to use segments and #pragma, but what to write in the Linker xcl file?

Best regards,

Frank Andersen

fa · ‎2006-02-14

Posted on February 15, 2006 at 05:05

I want to place code in flash, data for OS and buffers for USB in internal ram, and data large data structures in external ram.

Best regards, Frank Andersen

aialinux · ‎2006-02-16

Posted on February 17, 2006 at 03:25

I face the same problem. I don't know how to do.

fa · ‎2006-02-20

Posted on February 21, 2006 at 08:16

Thx,

To use the #pragma location

You have to define the segment eg. EXTRAM in the linker file, like this:

-DSRAMSTART=0x60000000

-DSRAMEND=0x600FFFFF

-Z(DATA)EXTRAM=SRAMSTART-SRAMEND

To declare a variable in the segment ''EXTRAM'' do:

#pragma location=''EXTRAM''

__no_init long ExtMem;

Best regards, Frank Andersen