Math.h File Reference

Detailed Description

Math utility functions.

#include <stdint.h>

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Macros
#define	Math_MIN(x, y)   (((x) < (y)) ? (x) : (y))
	Macro to determine the minimum of two numbers. More...
#define	Math_MAX(x, y)   (((x) > (y)) ? (x) : (y))
	Macro to determine the maximum of two numbers. More...
#define	Math_ABS(x)   ((x) < 0 ? -(x) : (x))
	Macro to calculate the absolute value of a numbers. More...

Functions
uint32_t	Math_divideBy1000 (uint32_t dividend)
	Divide a number by 1000. More...

Macro Definition Documentation

Math_MIN

#define Math_MIN	(		x,
			y
	)		(((x) < (y)) ? (x) : (y))

Macro to determine the minimum of two numbers.

Warning

Do not use arguments that have a side effect. For example do not use pre- and post-increment operators.

Parameters

x	The first number. Either an integer or a floating point type.
y	The second number. Must be the same type as x.

Returns

The minimum of x and y

Math_MAX

#define Math_MAX	(		x,
			y
	)		(((x) > (y)) ? (x) : (y))

Macro to determine the maximum of two numbers.

Warning

Do not use arguments that have a side effect. For example do not use pre- and post-increment operators.

Parameters

x	The first number. Either an integer or a floating point type.
y	The second number. Must be the same type as x.

Returns

The maximum of x and y

Math_ABS

#define Math_ABS

(

x

)

((x) < 0 ? -(x) : (x))

Macro to calculate the absolute value of a numbers.

Warning

Do not use arguments that have a side effect. For example do not use pre- and post-increment operators.

Parameters

x	The number to calculate the absolute value of. Either a signed integer or a floating point type.

Returns

The absolute value of x

Function Documentation

Math_divideBy1000()

uint32_t Math_divideBy1000

(

uint32_t

dividend

)

Divide a number by 1000.

This function is intended for devices without a hardware divider (for example CC23X0) that must run divisions (that are not a power of 2) in software. The generic software division implementations provided by compilers are relatively slow. This function only supports dividing by 1000, but does so in ~16 cycles vs. ~95 cycles for the generic implementations.

Warning

Limitations: The division is only accurate for dividend < 754515999, and off by 1 for values of dividend = 754515999 + 1000*n.

Parameters

dividend

The dividend to be divided by 1000. Must be below 754515999 for division to be accurate.

Returns

Returns dividend / 1000 (see limitations)