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CCS/MSP430FR2433: How to locate 1KByte variable on FRAM starting 0xC400~

Hisao Uchikoshi
Genius 14500 points
Part Number: MSP430FR2433

Tool/software: Code Composer Studio

Hello Experts,

We would like to use FRAM as SRAM since there are 1KB variable data and not enough for SRAM. CPU frequency is lower than 8MHz so access performance would not matter.

Trying several #pragma but not succeed.

Could you please provide any sample code for this use-case?

Regards,

Uchikoshi

  • 0
    TI__Genius 13215 points

    Hi Uchikoshi,

    You could define a section in FRAM for your variables, modify the lnk_msp430fr2433.cmd, and then use the #pragma DATA_SECTION

    step 1 -- define the section .textB in GROUP(READ_WRITE_MEMORY)

    /****************************************************************************/
/* Specify the sections allocation into memory                              */
/****************************************************************************/

SECTIONS
{
    GROUP(ALL_FRAM)
    {
       GROUP(READ_WRITE_MEMORY)
       {
          .TI.persistent : {}                /* For #pragma persistent            */
          .textB      : {}
       }

       GROUP(READ_ONLY_MEMORY)
       {
          .cinit      : {}                   /* Initialization tables             */
          .pinit      : {}                   /* C++ constructor tables            */
          .binit      : {}                   /* Boot-time Initialization tables   */
          .init_array : {}                   /* C++ constructor tables            */
          .mspabi.exidx : {}                 /* C++ constructor tables            */
          .mspabi.extab : {}                 /* C++ constructor tables            */
          .const      : {}                   /* Constant data                     */
       }

       GROUP(EXECUTABLE_MEMORY)
       {
          .textA      : {}                   /* I2C BSL Code */
          .text      : {}
       }
    } > FRAM

    step 2 -- link you data into the .textB section by #pragma DATA_SECTION. Guides could be found here:

    http://downloads.ti.com/docs/esd/SLAU132K/#SLAU132K_HTML/msp430_c_c_language_implementation.html#STDZ0559962 

     (page48 B4) www.ti.com/.../slau157ap.pdf

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