Embedded Software and Motor Control Libraries for PXR40xx

4.30.5 Re-entrancy
The function is re-entrant.
• With additional implementation parameter (i.e.
GFLIB_Asin(fltIn, &pParam, FLT), where the &pParam is
pointer to approximation coefficients. In case the default
approximation coefficients are used, the &pParam must be
replaced with GFLIB_ASIN_DEFAULT_FLT symbol. The
&pParam parameter is mandatory.
• With preselected default implementation (i.e.
GFLIB_Asin(fltIn, &pParam), where &pParam is pointer
to approximation coefficients. The &pParam parameter is
optional and in case it is not used, the default
GFLIB_ASIN_DEFAULT_FLT approximation
coefficients are used.
4.30.6 Code Example
#include "gflib.h"
tFloat fltInput;
tFloat fltAngle;
void main(void)
{
// input fltInput = 1
fltInput = 1;
}
// output should be 1.570796
fltAngle = GFLIB_Asin_FLT (fltInput, GFLIB_ASIN_DEFAULT_FLT);
// output should be 1.570796
fltAngle = GFLIB_Asin (fltInput, GFLIB_ASIN_DEFAULT_FLT, Define FLT);
// ##############################################################
// Available only if single precision floating point
// implementation selected as default
// ##############################################################
// output should be 1.570796
fltAngle = GFLIB_Asin (fltInput);
4.31 Function GFLIB_Atan_F32
Chapter 4 API References
This function implements Minimax polynomial approximation of arctangent function.
Embedded Software and Motor Control Libraries for PXR40xx, Rev. 1.0
Freescale Semiconductor, Inc. 233