Compiler/AM5728: DATA_ALIGN() Compile Error Using DSPLIB From C++

david kasper

Part Number: AM5728

Tool/software: TI C/C++ Compiler

I am trying to call DSPLIB's DSPF_sp_fir_gen() function from C++. Per DSPLIB documentation, function arguments need to be double-word aligned. I tried using DATA_ALIGN() in the .cpp file as follows:

#pragma DATA_ALIGN(m_fFirLpfCoeff, 8);

static float m_fFirLpfCoeff[FIR_LPF_ORDER] = {***};

However, I get a compiler error for the pragma statement:

>> Compilation failure
subdir_rules.mk:9: recipe for target 'DsplibTest.obj' failed
"../DsplibTest.cpp", line 91: error #2772: this constant expression has type "float *" instead of the required integral or enum type
1 error detected in the compilation of "../DsplibTest.cpp".

If I change the file to *.c type then the anomaly goes away. Please let me know how to fixed DATA_ALIGN for C++ *.cpp files.

Thanks,

Dave

over 5 years ago

0 Dave Bell over 5 years ago

TI__Genius 14680 points

The syntax for the pragmas are slightly different between C and C++. In C++ you do not specify the symbol, only the section name. Please see the C6000 Compiler Users Guide for details.

The syntax of the pragma in C is: #pragma DATA_ALIGN ( symbol , constant );

The syntax of the pragma in C++ is: #pragma DATA_ALIGN ( constant );

Best regards,

Dave

0 david kasper over 5 years ago in reply to Dave Bell

Intellectual 835 points

Dave,

Thank you very much for the fast response! That resolved my issue.

Regards,

Dave

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Compiler/AM5728: DATA_ALIGN() Compile Error Using DSPLIB From C++