MSP430FR5959: Unable to write data in FRAM

If you haven't changed the linker (.cmd) file, NOINIT variables (section .TI.noinit) are placed in RAM. [I'm assuming you meant NOINIT since "#pragma NONINIT()" would be ignored.]

If you have changed the linker file, please describe the changes since you may (or may not) need to involve the MPU.

i changed in linker(.cmd) but still not able set value ,looking forward to your help.

Please describe your changes to the .cmd file.

I tried your code on an FR5969 (Launchpad) and observed:

1) "#pragma NONINIT" was indeed ignored (with a Warning), and demo_config was put in RAM (.data).

2) Changing it to "#pragma NOINIT" got a different Warning about the initialization ("={1,}") and -- more to the point -- it apparently ignored the NOINIT specification and put demo_config in RAM (.data).

3) Removing the initialization put demo_config in .TI.noinit (still in RAM).

4) Changing the linker file to move the ".TI.noinit" line down to the write-able area at the bottom of FRAM (next to .TI.persistent) put demo_config in FRAM and allowed me to write it.

The .cmd fragment now looks like:

        GROUP(READ_WRITE_MEMORY)
        {
           .TI.persistent : {}              /* For #pragma persistent            */
           .TI.noinit  : {}                 /* For #pragma noinit                */
           .cio           : {}              /* C I/O Buffer                      */
           .sysmem        : {}              /* Dynamic memory allocation area    */
        } PALIGN(0x0400), RUN_START(fram_rw_start)

5) Setting Project->Properties->Debug->MSP430 Flash Settings->Erase Options to "necessary segments only" allowed me to retain demo_config over a code download.

[Edit: Minor clarification.]

Hello Namita - did Bruce's suggestion work for you?

we did this changes in .cmd file

but its not working yet

This change puts the NOINIT section in read-only FRAM, while step (4) above puts it in write-able FRAM. And without steps (2)-(3) your variable won't be put in that section anyway.

I suggest you make all of the changes I described, i.e. (a) change NONINIT->NOINIT (b) remove the initializer (c) move .TI.noinit into the READ_WRITE_MEMORY group (d) change the "Erase Options" so re-loading the code won't erase the NOINIT section.

we made changes as per attached image and to verify its working or not  we write syntax as below 

#pragma NOINIT(demo_config)
unsigned char demo_config[2] ={};

gost_demoConfig.a =5;
memcpy(&demo_config, &gost_demoConfig,sizeof(gost_demoConfig));
gost_demoConfig.a = 0;
memcpy(&gost_demoConfig, &demo_config,sizeof(demo_config));

putstr1("\nu16_TimePM:");
putch1(((gost_demoConfig.a)/100)%10 +'0');
putch1(((gost_demoConfig.a)/10)%10 + '0');
putch1((gost_demoConfig.a) %10 +'0');