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Embedded Software and Motor Control Libraries for PXR40xx

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Function GFLIB_Acos_FLT<br />

4.27.5 Re-entrancy<br />

The function is re-entrant.<br />

• With implementation postfix (i.e. GFLIB_Acos_FLT(fltIn,<br />

&pParam)), where the &pParam is pointer to<br />

approximation coefficients. In case the default<br />

approximation coefficients are used, the &pParam must be<br />

replaced with GFLIB_ACOS_DEFAULT_FLT symbol.<br />

The &pParam parameter is m<strong>and</strong>atory.<br />

• With additional implementation parameter (i.e.<br />

GFLIB_Acos(fltIn, &pParam, FLT), where the &pParam is<br />

pointer to approximation coefficients. In case the default<br />

approximation coefficients are used, the &pParam must be<br />

replaced with GFLIB_ACOS_DEFAULT_FLT symbol.<br />

The &pParam parameter is m<strong>and</strong>atory.<br />

• With preselected default implementation (i.e.<br />

GFLIB_Acos(fltIn, &pParam), where the &pParam is<br />

pointer to approximation coefficients. The &pParam<br />

parameter is optional <strong>and</strong> in case it is not used, the default<br />

GFLIB_ACOS_DEFAULT_FLT approximation<br />

coefficients are used.<br />

4.27.6 Code Example<br />

#include "gflib.h"<br />

tFloat fltInput;<br />

tFloat fltAngle;<br />

void main(void)<br />

{<br />

// input fltInput = 0<br />

fltInput = 0;<br />

// output should be 1.570796<br />

fltAngle = GFLIB_Acos_FLT (fltInput, GFLIB_ACOS_DEFAULT_FLT);<br />

// output should be 1.570796<br />

fltAngle = GFLIB_Acos (fltInput, GFLIB_ACOS_DEFAULT_FLT, Define FLT);<br />

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

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

// implementation selected as default<br />

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

220 Freescale Semiconductor, Inc.

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