util.h File Reference

Miscellaneous utility macros and procedures. More...

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Macros
#define	BIT(shift)   (1UL << (shift))
#define	BIT_MASK_SHIFT(mask, shift)   ((mask) << (shift))
#define	GET_BITS(x, m, n)   ((((uint32)x) << (31 - (n))) >> ((31 - (n)) + (m)))
#define	IS_POWER_OF_TWO(v)   ((v) && !((v) & ((v) - 1)))

Detailed Description

Miscellaneous utility macros and procedures.

Definition in file util.h.

Macro Definition Documentation

BIT

#define BIT

(

shift

)

(1UL << (shift))

1 << the bit number

Definition at line 40 of file util.h.

Referenced by gpio_read_bit(), gpio_set_mode(), gpio_toggle_bit(), gpio_write_bit(), i2c_lowLevel_deinit(), and i2c_lowLevel_init().

BIT_MASK_SHIFT

#define BIT_MASK_SHIFT	(		mask,
			shift
	)		((mask) << (shift))

Mask shifted left by 'shift'

Definition at line 42 of file util.h.

GET_BITS

#define GET_BITS	(		x,
			m,
			n
	)		((((uint32)x) << (31 - (n))) >> ((31 - (n)) + (m)))

Bits m to n of x

Definition at line 44 of file util.h.

IS_POWER_OF_TWO

#define IS_POWER_OF_TWO

(

v

)

((v) && !((v) & ((v) - 1)))

True if v is a power of two (1, 2, 4, 8, ...)

Definition at line 46 of file util.h.