approximations.c File Reference

Math approximations file. More...

#include "math.h"
#include "stdlib.h"
#include "stdint.h"
#include "approximations.h"

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Macros
#define	TAN15DEG   0.26794919243F
#define	TAN30DEG   0.57735026919F
#define	PADE_A   96.644395816F
#define	PADE_B   25.086941612F
#define	PADE_C   1.6867633134F

Functions
float	fasin_deg (float x)
float	facos_deg (float x)
float	fatan_deg (float x)
float	fatan2_deg (float y, float x)
float	fatan_15deg (float x)

Detailed Description

Math approximations file.

Significant efficiencies were found by creating a set of trig functions which trade off precision for improved power/CPU performance. Full details are included in Application Note AN5015: Trigonometry Approximations

Definition in file approximations.c.

Macro Definition Documentation

PADE_A

#define PADE_A   96.644395816F

Referenced by fatan_15deg().

PADE_B

#define PADE_B   25.086941612F

Referenced by fatan_15deg().

PADE_C

#define PADE_C   1.6867633134F

Referenced by fatan_15deg().

TAN15DEG

#define TAN15DEG   0.26794919243F

Referenced by fatan_deg().

TAN30DEG

#define TAN30DEG   0.57735026919F

Referenced by fatan_deg().

Function Documentation

facos_deg()

float facos_deg

(

float

x

)

Definition at line 43 of file approximations.c.

References fatan_deg().

Referenced by fAndroidAnglesDegFromRotationMatrix(), fNEDAnglesDegFromRotationMatrix(), and fWin8AnglesDegFromRotationMatrix().

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fasin_deg()

float fasin_deg

(

float

x

)

Definition at line 28 of file approximations.c.

References fatan_deg().

Referenced by fAndroidAnglesDegFromRotationMatrix(), feCompassAndroid(), feCompassNED(), feCompassWin8(), fNEDAnglesDegFromRotationMatrix(), and fWin8AnglesDegFromRotationMatrix().

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fatan2_deg()

float fatan2_deg	(	float	y,
		float	x
	)

Definition at line 109 of file approximations.c.

References fatan_deg().

Referenced by fAndroidAnglesDegFromRotationMatrix(), fNEDAnglesDegFromRotationMatrix(), and fWin8AnglesDegFromRotationMatrix().

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fatan_15deg()

float fatan_15deg

(

float

x

)

Definition at line 139 of file approximations.c.

References PADE_A, PADE_B, and PADE_C.

Referenced by fatan_deg().

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fatan_deg()

float fatan_deg

(

float

x

)

Definition at line 59 of file approximations.c.

References fatan_15deg(), TAN15DEG, and TAN30DEG.

Referenced by facos_deg(), fasin_deg(), fatan2_deg(), and fWin8AnglesDegFromRotationMatrix().

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