unresolved symbol error DSP/BIOS 5 and CCS 5.5.0.00077

Joshua Hinton

This is my first attempt at using CCS and a TI DSP. I am using a C6726 so I have the project set up for DSP Bios. As of right now I am unable to get a build to complete because it has the error:

"unresolved symbol my_function_name , first referenced in ./ DFE1cfg.obj"

I have the basic function calls in my main.cpp file before the main() function. I am trying to create Tasks and some SWI objects. I followed examples and used "_functionname" and several other syntax versions but it will not find the function defined. Is this a simple syntax issue or is there some other setting I am missing somewhere?

over 11 years ago

0 Lisa TI over 11 years ago

TI__Guru*** 130875 points

Hi Joshua,

this error is typical is a library is not included. Have a look here and hopefully that will guide you through the linkers file search path settings.

http://processors.wiki.ti.com/index.php/Include_paths_and_options

Please keep us informed.

Best Regards,

Lisa

0 AartiG over 11 years ago

TI__Guru**** 173310 points

Joshua Hinton said:
I have the basic function calls in my main.cpp file before the main() function.

It appears that your source files are C++. BIOS is implemented as a combination of C and assembly, so there are some considerations when mixing C and C++. This is likely the source of your error.

Please see this wiki page for more information:
http://processors.wiki.ti.com/index.php/Overview_of_C%2B%2B_Support_in_TI_Compilers#BIOS_and_C.2B.2B

0 Joshua Hinton over 11 years ago in reply to AartiG

Prodigy 100 points

That at least is starting to make sense. I have spent several days attempting to get CCS and dsp/bios to compile. Do I need to rewrite all of my various functions to fit strict C standard for the code to work correctly?

0 AartiG over 11 years ago in reply to Joshua Hinton

TI__Guru**** 173310 points

The key thing is to enclose function declarations within extern "C". Please see the Name Mangling section of that wiki page I referenced. There is also a "bigtime" DSP/BIOS example that comes with CCS that you can look at for reference. When you go through the project wizard to create a new project, the bigtime example should be available under "Project Templates and examples".

0 Joshua Hinton over 11 years ago in reply to AartiG

Prodigy 100 points

I did go back and look at the example again. Sometimes it amazes me how something so trivial can cause such headaches. I wrapped my call functions in an "extern "C" {}" and now it compiles just fine. I'm certainly glad I didn't have to rewrite all of the header files in strict C. Thanks.

Code Composer Studio™︎

Code Composer Studio forum

unresolved symbol error DSP/BIOS 5 and CCS 5.5.0.00077