CCS/TMS320F28377D: How to read and write data to the MCU internal Flash

Shimon,

TMS320F28377D has 512KB of Flash per CPU.  Please check Table 6.3.2 Flash Memory Map in datasheet at .

You can dedicate couple of Flash sectors for data and you can use them to program your counter data.  Refer to this thread on how you can use Flash for this purpose:  

You can use F021_API_F2837xD_FPU32.lib (Flash API library) to erase/program the Flash.  This library is available at controlSUITE\device_support\F2837xD\v210\F2837xD_common\lib.

Flash API usage example is also available at controlSUITE\device_support\F2837xD\v210\F2837xD_examples_Dual\flash_programming.

Flash API documentation is available at controlSUITE\device_support\F2837xD\v210\doc\FlashAPI_Doc.

Note that you can not erase/program Flash while executing the code from Flash.  Hence, you need to have a RAM run address for Flash API functions (and for the functions that call the Flash API functions) as shown in the example mentioned above.

Hope this helps.

Thanks and regards,

Vamsi

Thanks for the quick response. one last question, if i want to boot my program from the flash i cant read/write from other unused flash sectors?

how should i boot my program from a RAM? you meant the internal or external RAM??

Thanks!

but i see that for this issue, implementing a time counter in the internal flash is not a quiet good idea because every write of new value demands a erase of the entire sector..

so my next question is, if in any chance there's some kind of time counter on chip in the TMS320f28377D??

Thanks.

for example, the ipc free running counter.

after reset the counter resets or saves the last number stored?

Hi Vamsi

thanks for the info. the link to the thread links to other thread, where they reccomended using the Eeprom emulator. i will check this out. 

Thanks!

hi Vamsi

i'm working with the Sprab69 document and example. i checked it out and and noticed that the example is relevant to the 2833 family. i'm working with the F2837xD. is it relevant?

Hi Vamsi

Thanks for the help

but i cant find many functions and variables that ahs been used in the eeprom emulator example.. such as memcopy(..) function. this function should be in string.h file but i cant find it...

can you help?

Shimon,

memcpy() is part of RTS library now.

Please note that we don't have a EEPROM solution for F2837xD device. EEPROM functions that you see in that document can not be used directly for this device. I asked you to go through it so you can develop a solution as needed.

Thanks and regards,
Vamsi

Hi vamsi,

i understand, but the issue right now is the following line:

memcopy(&Flash28_API_LoadStart,&Flash28_API_LoadEnd,&Flash28_API_RunStart)

in the Eeprom example, those variables located in the Flash2823x_API_Library.h file. wher i can find the vriables in my project?

Shimon,

In F2823x device linker cmd files, we used to use two sets of symbols - one set for ramfuncs and another set for Flash28_API as copied below from the corresponding linker command file.  

   Flash28_API:
   {
        -lFlash28335_API_V210.lib(.econst) 
        -lFlash28335_API_V210.lib(.text)
   }                   LOAD = FLASHD, 
                       RUN = RAML0,  
                       LOAD_START(_Flash28_API_LoadStart),
                       LOAD_END(_Flash28_API_LoadEnd),
                       RUN_START(_Flash28_API_RunStart),
                       PAGE = 0
   
   ramfuncs     : LOAD = FLASHD, 
                         RUN = RAML0, 
                         LOAD_START(_RamfuncsLoadStart),
                         LOAD_END(_RamfuncsLoadEnd),
                         RUN_START(_RamfuncsRunStart),
                         PAGE = 0

For the F2837xD and other latest devices, we are using only one set of symbols for both the ".TI.ramfunc" section and the Flash API library as shown below by using GROUP directive (Below is taken from controlSUITE\device_support\F2837xD\vx\F2837xD_examples_Dual\flash_programming\cpu01flash_programming_cpu1_FLASH.cmd file).  These symbols are defined by the linker during the link step.  All these symbols are declared in F2837xD_GlobalPrototypes.h file.

        GROUP
        {
            .TI.ramfunc
            { -l F021_API_F2837xD_FPU32.lib}
         
        } LOAD = FLASHD,
          RUN  = RAMLS03, 
          LOAD_START(_RamfuncsLoadStart),
          LOAD_SIZE(_RamfuncsLoadSize),
          LOAD_END(_RamfuncsLoadEnd),
          RUN_START(_RamfuncsRunStart),
          RUN_SIZE(_RamfuncsRunSize),
          RUN_END(_RamfuncsRunEnd),
          PAGE = 0 

Thanks and regards,

Vamsi