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

Steven Alappat

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

over 5 years ago

0 Santosh Jha over 5 years ago

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 Steven Alappat over 5 years ago 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 Santosh Jha over 5 years ago 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 Steven Alappat over 5 years ago 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.

C2000™︎ microcontrollers

C2000 microcontrollers forum

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