CCS/MSP430FR6989: MSP430 Memory Addressing

Lim Voon Shin

Prodigy 70 points

Part Number: MSP430FR6989

Tool/software: Code Composer Studio

Hi,

I try to locate variables to a specific memory location but it isn't working

Here is my code:

#pragma SET_DATA_SECTION(".infoD")
int x;
#pragma SET_DATA_SECTION()

int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer

x = 5;

return 0;
}

Here is my logfile(this is a hex TI-txt output) result:

Why the variable, x is not on the memory location that I set? I have edit the Erase options to Erase main and information memory and it still don't work.

I am using CCSv9 and MSP430 compiler v18.12.2. Thank you.

over 6 years ago

0 Lim Voon Shin over 6 years ago

Prodigy 70 points

And here is the .infoD memory address:
INFOD : origin = 0x1800, length = 0x0080
Thank you

0 Bruce McKenney over 6 years ago

Guru 100895 points

> int x;

It's possible this is being optimized away. A quick experiment: Try

> volatile int x;

0 Lim Voon Shin over 6 years ago in reply to Bruce McKenney

Prodigy 70 points

Hi,
This also can't work. Or are they any ways that can see the result to prove that I am correct?
Thanks.

0 Harry Qiu over 6 years ago in reply to Lim Voon Shin

TI__Intellectual 2115 points

Hi Lim,

Actually your configuration is correct. But the way you observe is wrong. I tried this from my side, and in debug mode, you can see that the compiler has already put the variable "x" in to address 0x1800. Shown as below figures:

Moreover, if you want to use "x" as a variable, not a const value, you'd better also remove the "MPU" function. Highly recommend to refer to the User's Guide for detailed configuration first. Shown the way to remove "MPU" (right click the project, select "properties)":

Regards,

Harry

0 Lim Voon Shin over 6 years ago in reply to Harry Qiu

Prodigy 70 points

Hi Harry,

I follow your instructions but that doesn't work too.

Is there any settings net to be modified?

Thanks.

0 Lim Voon Shin over 6 years ago in reply to Lim Voon Shin

Prodigy 70 points

The settings was in project properties -> Debug -> Auto Run and Launch Options -> "Halt the debugger before any debuger access..."
I solve this problem. But now how can I match the memory location to TI-txt file?

Thanks.

0 Harry Qiu over 6 years ago in reply to Lim Voon Shin

TI__Intellectual 2115 points

Hi Lim,

I didn't set any other configuration there. Could you please check the .map file in the "debug" folder, like shown below:

You can see that INFOD has been used 2 bytes for int type variable "x".

And also, you can find the variable "x" is already located at address 0x1800 as below:

Could you please check your .map file (at "debug" folder)?

Regards,

Harry

ps, found you already got solved. Still post above content as a reference for others.

0 Harry Qiu over 6 years ago in reply to Lim Voon Shin

TI__Intellectual 2115 points

Hi Lim,

TI-txt file is for code memory(no matter the code locates at FRAM or SRAM), not variables. For full memory map, you can find at the .map file.

0 Lim Voon Shin over 6 years ago in reply to Harry Qiu

Prodigy 70 points

Hi Harry,

Yes, I can find it in .map file.

Thank you.

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CCS/MSP430FR6989: MSP430 Memory Addressing