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Embedded Software and Motor Control Libraries for PXR40xx

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Function MLIB_Abs_FLT<br />

This inline function returns the absolute value of input parameter. The input value as well<br />

as output value is considered as single precision floating point data type. The output<br />

saturation is not implemented in this function, thus in case the absolute value of input<br />

parameter is outside the (-2 128 , 2 128 ) interval, the output value will overflow without any<br />

detection.<br />

Note<br />

Due to effectivity reason this function is implemented as inline<br />

<strong>and</strong> thus is not ANSI-C compliant.<br />

4.117.5 Re-entrancy<br />

The function is re-entrant.<br />

4.117.6 Code Example<br />

#include "mlib.h"<br />

tFloat fltIn;<br />

tFloat fltOut;<br />

void main(void)<br />

{<br />

// input value = -0.25<br />

fltIn = -0.25;<br />

}<br />

// output should be 0.25<br />

fltOut = MLIB_Abs_FLT(fltIn);<br />

// output should be 0.25<br />

fltOut = MLIB_Abs (fltIn, Define FLT);<br />

// ##############################################################<br />

// Available only if single precision floating point<br />

// implementation selected as default<br />

// ##############################################################<br />

// output should be 0.25<br />

fltOut = MLIB_Abs (fltIn);<br />

The output of the function is defined by the following simple equation:<br />

Equation MLIB_Abs_Eq1<br />

<strong>Embedded</strong> <strong>Software</strong> <strong>and</strong> <strong>Motor</strong> <strong>Control</strong> <strong>Libraries</strong> <strong>for</strong> <strong>PXR40xx</strong>, Rev. 1.0<br />

548 Freescale Semiconductor, Inc.

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