LAUNCHXL-F28027F: How to set a part of flash to be persistent

Asha,

Your question is vague. What do you mean by persistent? Do you mean you want keep updating calibration value / some other parameters to be repeatedly updated in flash?

Regards,

Manoj

Hi Manoj,
I mean I would like to save some parameters (32 to 64 bytes) so that these can be retrieved on power up. We are adding additional motor sensor parameters to our project that people will tune and that is why I am investigating this.

Thanks,
Asha

Hi Manoj,

I think I have it working by modifying the F28027F.cmd file and my project file:

In F28027F.com file I added

        "                   .......

             vib_buf_data       : > D_RAML0      PAGE = 1

              graph_data   : > D_RAML0      PAGE = 1

              myPersistent      : > D_RAML0    PAGE = 1 ------------ I added this "

Then in my proj source file I added

               uint16_t test_persistent[4];

               #pragma DATA_SECTION(test_persistent, "myPersistent");

In my main() I added the below code and it seems to retain the values after restarting of my debugger:

     

            if(test_persistent[0] == 0)

            {

                   test_persistent[0] = 2;

                   test_persistent[1] = 1;

                   test_persistent[2] = 3;

                   test_persistent[3] = 4;

            }

           else if(test_persistent[0] == 2)

            {

                  test_persistent[0] = 5;

                  test_persistent[1] = 7;

                  test_persistent[2] = 8;

                  test_persistent[3] = 9;

           }

But how can I guarantee that the test_persistent[] will always hold the latest data? Can I assign a specific Flash memory?

Thanks,

Asha

 

  

This is a duplicate thread. I shall be closing this thread.
-Manoj