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After using memcpy & ramfuncs, program only runs once, ramfuncs not being copied to ram at every boot.

Steven Alappat
Prodigy 60 points
Part Number: TMS320F28027

I was trying to load a function(ePWM interrupt) into RAM. I made some changes to the linker file. Basically, added a line. When I'm debugging, the function seems to be running from RAM. But if I reboot the controller, it's gone. I realize that the function needs to be copied at every boot. But that is not happening. How do I get it to copy the function at every boot.

I noticed that even after adding ramfuncs and making changes to the linker file, I still get the error  "creating output section "ramfuncs" without a SECTIONS specification". I have added the zip file of my project. I have looked up many references and example codes. What else do I have to do to get it working? Any help is appreciated.

Thank You,

Steven.TheCode v0.53.rar

  • 0
    TI__Guru 50511 points

    Hi Steven,

    You should be able to modify the linker command file such that it loads from one address location and run from other location. Please take a look at 

    http://software-dl.ti.com/ccs/esd/documents/sdto_cgt_Linker-Command-File-Primer.html

  • 0 in reply to Santosh Jha
    Prodigy 60 points

    Hi Santosh,

    Could you please be more specific. What do I have to change in the linker file?

    Regards,

    Steven

  • 0 in reply to Steven Alappat
    TI__Guru 50511 points

    Steven,

    What TI compiler version you are using?

    #ifdef __TI_COMPILER_VERSION__
   #if 0 //__TI_COMPILER_VERSION__ >= 15009000
    .TI.ramfunc : {} LOAD = FLASHA,
                         RUN = PRAML0,
                         LOAD_START(_RamfuncsLoadStart),
                         LOAD_END(_RamfuncsLoadEnd),
                         RUN_START(_RamfuncsRunStart),
                         LOAD_SIZE(_RamfuncsLoadSize),
                         PAGE = 0
   #else
   ramfuncs            : LOAD = FLASHA,
                         RUN = PRAML0,
                         LOAD_START(_RamfuncsLoadStart),
                         LOAD_END(_RamfuncsLoadEnd),
                         RUN_START(_RamfuncsRunStart),
                         LOAD_SIZE(_RamfuncsLoadSize),
                         PAGE = 0   
   #endif
#endif

    I tried to build your code, and I was getting the same error. Then I commented compiler version check, and then it is building ok. I am using cgt 18.12.03 STS.

    So please check the compiler version and modify the check accordingly.

  • 0 in reply to Santosh Jha
    Prodigy 60 points

    Dear Santosh,

    That resolved my issue. I just checked it on my hardware as well. Thank you very much.

    However, shouldn't these changes be made in future c2000 updates officially..

    Anyways, thanks a lot.

    Steven.