TMS320F280049: how to invoke sqrt() funciton without include the library

Linna,

user6283973 said:

I found this in the UG: the inline function can only used in the background task? but in the example it seems not.

It should say that within the background task, only the inline function can be used.  The background task doesn't allow for calling functions.  

Within other tasks, either the inline or the called function can be used. 

user6283973 said:

Does that mean I can just only include clamath.h and invoke the inline funciton without include the library?

Yes, however,  if the non-inline version is included but not used it won't take up codespace.   Did you have trouble doing this?

user6283973 said:

Since I don't use any trigonometric functions, do I need to  include rom_symbols_lib in project?

You don't.  But if they are not used, they do not take up any space.  

user6283973 said:

One more quesiton is that in the clamath.h, it present several realization of sqrt, by TMU, FPU, inline, .lib, 

I want to know, are they all avaliable in cla code? Thanks.

The #defines in the CLAmath.h translate a C28x FPU/TMU intrinsic to a CLA function.  This is for code that is being migrated from the C28x FPU/TMU to the CLA.

For example:

• The application running on the C28x + TMU uses the intrinsic __divf32. 
• Then the code is moved to the CLA the #define will substitute CLAdiv_inline for the intrinsic. 

//
// TMU Intrinsics for CLA2
//
#define __divf32           CLAdiv_inline
#define __sqrt             CLAsqrt_inline
#define __sin              CLAsin_inline
#define __cos              CLAcos_inline
#define __atan             CLAatan_inline
#define __atan2            CLAatan2_inline
#define __sinpuf32         CLAsinPU_inline
#define __cospuf32         CLAcosPU_inline