Forcing a variable to a specific location and have linker's knowledge of it in CCE3.1

You can assign data to absolute addresses or named sections using CCE. To achieve absolute data placement, you can do this using the linker command file and declaring the variable as extern in the C code. Please refer to section C.3 of MSP-FET430 Users Guide for more details, http://www-s.ti.com/sc/techlit/slau157

For named section you can place the variable in a named section using #pragma DATA_SECTION and then place the named section to a memory region within the SECTIONS directive of the linker command file.

For eg:

In C code:

#pragma DATA_SECTION(tempOffset, "mysect")
int tempOffset;

In the linker command file:

MEMORY
{
   ...
   FLASH1 : origin = 0x10F4, length = 0x20
   ...
   ...
}

SECTIONS
{
   ...
   mysect : {} > FLASH1
   ...
}

Thanks for responding so quickly. I've noticed that you are using FLASH1, I'm going to be putting data into RAM.

I was also hoping to avoid using the command-linker file and do this with extended C syntax, "unsigned char myChar @ 0x1c00" which in this example is the start of RAM. Does the C compiler in CCE3.1 allow one to do this or something similar with different syntax?

Thanks,

John

The C compiler in CCE does not support that syntax. You would need to use the linker command file to control placement.