TMS320F280025C-Q1: cannot use #pragma DATA_SECTION(symbol, "section name") to save a string into flash

anxing wang

Hi,TI.

I am using F280025C-Q1. I want to save a sting like "0123456789" into flash by using #pragma DATA_SECTION(symbol, "section name"), but it did not work.

1st,I change the file 28002x_generic_flash_lnk.cmd as follows:

MEMORY
{
......
/* Flash sectors */
/* BANK 0 */
......

FLASH_SAVE_INFO : origin = 0x085000, length = 0x001000 /* array storage flash */
......
}

SECTIONS
{

......

InfoSection : > FLASH_SAVE_INFO, ALIGN(8) /* Array storage section */

......
}

2nd, I use this two command in main.c as follows:

#include "driverlib.h"
#include "device.h"
#include "board.h"

#pragma DATA_SECTION(info_array,"InfoSection");
const char info_array[10] = "0123456789";

Last, I change the project properties that pre-define _FLASH symbol and switch it to CPU1_FLASH.

However, I can not find the string "0123456789" at 0x085000 address when I open the hex file.

Then, I open the map file and still can not find the info_array symbol.

However, it did work exactly when I use the same method on F280049 and F28027.

So why?Why it did not work on F280025C using the same method?

My CCS version is 11.1.0.00011. The compiler cersion is TI v21.6.0.LTS.

over 3 years ago

+1 Veena Kamath over 3 years ago

TI__Mastermind 32655 points

Hi,

Does the application use the array anywhere in the code? In EABI compiler, unreferenced sections are removed from the final .out. If you want to retain that section, you can use the #pragma RETAIN.

Were you suing COFF format with F280049? Or was F28004x application explicitly referencing the symbol info_array ?

For more details, https://software-dl.ti.com/ccs/esd/documents/C2000_c28x_migration_from_coff_to_eabi.html#conditional-linking-section-removal-or-retention

Regards,

Veena

0 anxing wang over 3 years ago in reply to Veena Kamath

Prodigy 20 points

Hi Veena,

Thanks for your reminder. I found the F280025 projects are all in EABI compiler.But it did not work by using #pragma RETAIN in EABI compiler.Then I change it to COFF format, it did work.

And I check the properties of F280049 project and they are indeed in COFF format.

Best wish!

0 Veena Kamath over 3 years ago in reply to anxing wang

TI__Mastermind 32655 points

Hi,

Have you defined #pragma as follows?

#pragma RETAIN(info_array)

This should retain the array in the final .out even if it is not explicitly referenced in the application. Let us know if this does not work

I would recommend you use EABI compiler itself, as some of the library support for f28002x devices might be EABI only.

Regards,

Veena

0 anxing wang over 3 years ago in reply to Veena Kamath

Prodigy 20 points

Hi，Veena.

Yes，I tried use #pragma RETAIN(info_array), but it did not work.Then I tried use #pragma RETAIN("InfoSection") and it still did not work.Last, it did work even without the #pragma RETAIN when I call the member of the info_array in my main function at EABI format.

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TMS320F280025C-Q1: cannot use #pragma DATA_SECTION(symbol, "section name") to save a string into flash