CCS/MSP430FR5969: Get start address and size of custom memory section

Luis RC

Genius 16840 points

Part Number: MSP430FR5969

Tool/software: Code Composer Studio

Hi,

Is it possible to get the start address and size (or end address) of a custom memory section?

For example, I define some variables in a custom area ".myarea"

#pragma DATA_SECTION(my_var, ".myarea")

volatile unsigned char my_var[10];

Then I place this region in FRAM in the linker file:

.myarea : type = NOINIT{} > FRAM

Note that I don't want to define a pre-defined area with a fixed size in the linker file. I want this region to be placed in FRAM and grow organically.

Is it possible to read the start address and size of ".myarea" in my application code to do something like a memcpy?

Regards,

Luis R

over 7 years ago

0 Luis RC over 7 years ago

TI__Genius 16840 points

I found that the following can work:

.myarea : RUN_START(MYAREA_START), RUN_SIZE(MYAREA_SIZE), type = NOINIT{} > FRAM

And the code:

uint8_t *ptr;
uint16_t i;

extern uint16_t MYAREA_START, MYAREA_SIZE;

ptr = (uint8_t *) _symval(&MYAREA_START);
for (i=0; i < _symval(&MYAREA_SIZE); i++)
{
}

This information is found here

0 George Mock over 7 years ago in reply to Luis RC

TI__Guru**** 244120 points

The RUN_START operator is described in MSP430 assembly tools manual. Proper use of symbols created in the linker command file is discussed in the section titled Using Linker Symbols in C/C++ Applications.

Thanks and regards,

-George

Code Composer Studio™︎

Code Composer Studio forum

CCS/MSP430FR5969: Get start address and size of custom memory section