assembly code in C++

Philipp Knellwolf

I tried to implement the CAN workaround for F2812 (sprc180.zip).
My application is written in C++ and the compiler option 'Parser' -> 'Treat C files as C++ files (-fg)' is set.
When i set this option, the linker is not able to find the Symbols in the assembly file.

Linker error message:
_CanDoubleWritePort(volatile unsigned long *, unsigned long)
                                 D:\Projekte\Steuerungen\AUI\Software\0C79\Debug\can_ecan.obj
_CanDoubleResetBit(volatile unsigned long *, unsigned long)
                                 D:\Projekte\Steuerungen\AUI\Software\0C79\Debug\can_ecan.obj
_CanDoubleTestBit(volatile unsigned long *, unsigned long)
                                 D:\Projekte\Steuerungen\AUI\Software\0C79\Debug\can_ecan.obj
_CanDoubleReadPort(volatile unsigned long *)
                                 D:\Projekte\Steuerungen\AUI\Software\0C79\Debug\can_ecan.obj
_CanDoubleSetBit(volatile unsigned long *, unsigned long)
                                 D:\Projekte\Steuerungen\AUI\Software\0C79\Debug\can_ecan.obj
>>   error: symbol referencing errors - './Debug/aui_debug.out' not built

What is the difference between the implementation of assembly code in C and C++?
What can i do to make it work?

Greats
Philipp

over 17 years ago

0 John Lagerquist over 17 years ago

Intellectual 420 points

Did you wrap the function headers in extern "C"?

extern "C"

{

extern CanDoubleWritePort(...);

}

0 Philipp Knellwolf over 17 years ago in reply to John Lagerquist

Prodigy 80 points

That's it!

Thank you very much.

Greats
Philipp

0 George Mock over 17 years ago in reply to Philipp Knellwolf

TI__Guru**** 253170 points

A more complete explanation can be found in this Wiki article http://tiexpressdsp.com/index.php?title=Overview_of_C%2B%2B_Support_in_TI_Compilers#Name_Mangling .

Thanks and regards,

-George

0 HS FAE Germany over 14 years ago in reply to George Mock

TI__Mastermind 32760 points

where do I find the CAN workaround .asm (SPRC180 )?

Regards
Holger

0 Joern over 14 years ago in reply to HS FAE Germany

Genius 3055 points

Just look here:

www.ti.com/lit/zip/SPRC180

Regards,
Joern.

(Although I don't know what this your question has to do with the above thread.)

P.S.

For all who are looking for some PDF or ZIP file like GRMPFL0815 - TI has a useful mechanism behind these URLS which should be announced ever and ever:

www.ti.com/lit/pdf/grmpfl0815 deliveres the document grmpfl0815*.pdf (where '*' is nothing or the highest value, often the last character stands for the revision)

www.ti.com/lit/zip/grmpfl0815 deliveres the same for zip

Both of course only if the searched document or file exists...

Would be nice if TI would document that feature exactely and integrate this feature into their site here...

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assembly code in C++