Placing data at a specific memory location

Mdivis

March 10, 2010 22:41

Does anyone know how to place data(variable) at a specific memory location?

I tried:

#pragma dataseg("DATA")
BYTE var;
#pragma dataseg(default)

and then I added a program section in the linker placement file:

But my "var" is not placed in memory location 0x2400.

Anyone knows what I am missing?

Thanks

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5 comments

Louis Tran

March 10, 2010 23:14
Not sure if this help, but try have you tried adding "size = 'NumOfBytes'"
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Mdivis

March 11, 2010 21:55
Yes I tried that.

I'm surprised how little information there is about this and I thought it would be a trivial task.

Does anyone have any other idea?
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Jon Elliott

March 12, 2010 12:36
I think the problem is that var is zeroed data, not initialised data, so you need to use #pragma zeroedseg rather than #pragma dataseg.
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Todd Hunter

February 18, 2011 02:51
I'm in the process of upgrading my project from Cross Studio v1.3 to v2.0.9 (for MSP430). I'm trying to place a specific code section at a specific address, but the ProgramSection "start" arguement is being ignored and simply placing the code section after the end of the previous section. Here's an example of what I am doing:

<MemorySegment name="FLASH">

<ProgramSection load="Yes" name="CODE" />

<ProgramSection load="Yes" name="CONST" />

<ProgramSection load="Yes" start="0xec00" name="MyCode" />

</MemorySegment>

I would expect to see MyCode section at 0xEC00, but it falls immediately after CONST.

Any ideas?
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Todd Hunter

February 18, 2011 03:16
OK, I just hardcoded a "size" arguement to the ProgramSection and that worked. The size is bigger than I need, but atleast the code is placed in the correct section now.

<ProgramSection size="0x1000" load="Yes" start="0xec00" name="MyCode" />
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