Unable to place multiple sections in MSP430G2553 under CCS v6

Mani Sathasivam

Hi all,

I'm trying to place different pieces of codes in flash memory. For this I have created 2 sections in linker script, .usec and .bsec both placed in different memory locations.

Then in program code I used

#pragma CODE_SECTION(func1,".usec");

and

#pragma CODE_SECTION(func2,".bsec");

But after building, I can see only one section placed in memory .usec not other one.

Also I cant sew func2 allocated anywhere

Can you guys help me in this issue?

over 9 years ago

0 Katie Pier over 9 years ago

TI__Guru* 78191 points

Hi Mani,

Could you provide a simple example of your code and your custom linker file that reproduces the issue? - it might be difficult to know what is happening otherwise. My thought would be that maybe your other function is being optimized out - is it called anywhere in your program or is it never used?

Regards,
Katie

0 Mani Sathasivam over 9 years ago in reply to Katie Pier

Intellectual 365 points

Hi Katie,

Actually I'm not calling that func2, it will be placed in a fixed memory location and gets called using address instead of function name itself.

I'm using function pointer for doing this.

funcPtr = (unsigned int*)0x0000c100;
funcPtr();

Address is the start of function. Please correct me if I'm doing anything wrong.

0 Katie Pier over 9 years ago in reply to Mani Sathasivam

TI__Guru* 78191 points

Hi Mani,

Is there a reason for calling the function in this way? You'll have to make sure the start of your function is always placed at the same address if you do this. Is the function coming from some other code maybe?

I suspect then that your function is getting optimized out because the compiler doesn't understand that you are actually calling it anywhere. I would try looking through the compiler guide www.ti.com/lit/pdf/slau132 and using the RETAIN pragma, like this for example:

#pragma RETAIN(func2)
#pragma CODE_SECTION(func2,".bsec");
void func2(void)
{
...
}

The RETAIN pragma should tell the compiler not to optimize out the function even though it isn't directly aware of you calling it anywhere.

Regards,

Katie

0 Katie Pier over 9 years ago in reply to Katie Pier

TI__Guru* 78191 points

Hi Mani,

Did this resolve your issue?

Regards,
Katie

0 Mani Sathasivam over 9 years ago in reply to Katie Pier

Intellectual 365 points

Hi Katie,

Yes. The function is being optimized out by the compiler.

I used RETAIN pragma and it worked!.

0 Katie Pier over 9 years ago in reply to Mani Sathasivam

TI__Guru* 78191 points

Great! I'm glad to hear that this fixed your problem :-)
-Katie

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

Unable to place multiple sections in MSP430G2553 under CCS v6