Any special head file is required for using 'abs' function?

xiangyun zeng

Intellectual 440 points

Hi,

I created a CCSv6 C++ project based on F2812, tried to use 'abs' function but failed, the error is:

#20 identifier "abs" is undefined

I tried to include IQMathLib.h and <math.h> but neither works. What do I missed?

Any comments are appreciated.

over 10 years ago

0 Christopher Chiarella over 10 years ago

TI__Mastermind 30255 points

Hello,

abs() can be used in C++ by including <stdlib.h>. You could also use the intrinsic __abs16_sat to take the 16-bit absolute value.

More information on the C28x support of C++ in section 6.2 of www.ti.com/.../spru514h.pdf
More information on supported intrinsics in section 7.5.6.

Edited for correctness.

Best Regards,
Chris

0 Bill Finger over 10 years ago

Genius 3735 points

The function abs() is defined in <stdlib.h>.

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Any special head file is required for using 'abs' function?