bit_manip.h File Reference

Bit twiddling macros. More...

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Macros
#define	BIT_SET(var, pos)   ((var) |= (1U<<(pos)))
	Set bit b (0-7) in byte a.
#define	BIT_CLEAR(var, pos)   ((var) &= ~(1U<<(pos)))
	Clear bit b (0-7) in byte a.
#define	BIT_CHECK(var, pos)   !!((var) & (1U<<(pos)))
	Is bit pos (0-7) in byte var set?
#define	BIT_TOGGLE(var, pos)   ((var)^= 1UL << (pos))
	Toggle the value of bit pos (0-7) in byte var.
#define	BIT_WRITE(var, pos, bitvalue)   ((bitvalue) ? BIT_SET((var), (pos)) : BIT_CLEAR((var), (pos)))
	Set the value ([0,1], [true, false]) of bit pos (0-7) in byte var.

Detailed Description

Bit twiddling macros.

Macro Definition Documentation

BIT_CHECK

#define BIT_CHECK	(		var,
			pos
	)		!!((var) & (1U<<(pos)))

Is bit pos (0-7) in byte var set?

BIT_CLEAR

#define BIT_CLEAR	(		var,
			pos
	)		((var) &= ~(1U<<(pos)))

Clear bit b (0-7) in byte a.

BIT_SET

#define BIT_SET	(		var,
			pos
	)		((var) |= (1U<<(pos)))

Set bit b (0-7) in byte a.

BIT_TOGGLE

#define BIT_TOGGLE	(		var,
			pos
	)		((var)^= 1UL << (pos))

Toggle the value of bit pos (0-7) in byte var.

BIT_WRITE

#define BIT_WRITE	(		var,
			pos,
			bitvalue
	)		((bitvalue) ? BIT_SET((var), (pos)) : BIT_CLEAR((var), (pos)))

Set the value ([0,1], [true, false]) of bit pos (0-7) in byte var.