Bitmap 的协作图:

宏定义
#define	LOS_INVALID_BIT_INDEX 32

函数
void	LOS_BitmapSet (UINT32 *bitmap, UINT16 pos)
	Set one bit.

void	LOS_BitmapClr (UINT32 *bitmap, UINT16 pos)
	Clear one bit.

UINT16	LOS_LowBitGet (UINT32 bitmap)
	Find the lowest one bit that is set.

UINT16	LOS_HighBitGet (UINT32 bitmap)
	Find the highest one bit that is set.

详细描述

宏定义说明

◆ LOS_INVALID_BIT_INDEX

#define LOS_INVALID_BIT_INDEX 32

Flag that indicates the invalid bit index.

The effective bit index is from 0 to 31.

函数说明

◆ LOS_BitmapClr()

void LOS_BitmapClr	(	UINT32 *	bitmap,
		UINT16	pos
	)

Clear one bit.

Description:: This API is used to clear one bit of variable according to the parameter.

注意

When the value of pos is greater than 31, the bit (pos & 0x1f) of bitmap will be clear.

参数

bitmap	[IN] The bitmap variable pointer.
pos	[IN] The number bit to be cleared.

返回值

None.

Dependency:

los_bitmap.h: the header file that contains the API declaration.

参见: LOS_BitmapSet.

自从: Huawei LiteOS V100R001C00

◆ LOS_BitmapSet()

void LOS_BitmapSet	(	UINT32 *	bitmap,
		UINT16	pos
	)

Set one bit.

Description:: This API is used to set one bit of variable according to the parameter.

注意

When the value of pos is greater than 31, the bit (pos & 0x1f) of bitmap will be set.

参数

bitmap	[IN] The bitmap variable pointer.
pos	[IN] The number bit to be set.

返回值

None

Dependency:

los_bitmap.h: the header file that contains the API declaration.

参见: LOS_BitmapClr

自从: Huawei LiteOS V100R001C00

◆ LOS_HighBitGet()

UINT16 LOS_HighBitGet ( UINT32 bitmap )

Find the highest one bit that is set.

Description:: This API is used to find the highest one bit that is set and return the bit index.

注意: None.

参数

bitmap [IN] The bitmap variable.

返回值

UINT16 The bit index of the highest one bit that is set.

Dependency:

los_bitmap.h: the header file that contains the API declaration.

参见: LOS_LowBitGet

自从: Huawei LiteOS V100R001C00

◆ LOS_LowBitGet()

UINT16 LOS_LowBitGet ( UINT32 bitmap )

Find the lowest one bit that is set.

Description:: This API is used to find the lowest one bit that is set and return the bit index.

注意: None.

参数

bitmap [IN] The bitmap variable.

返回值

UINT16 The bit index of the lowest one bit that is set.

Dependency:

los_bitmap.h: the header file that contains the API declaration.

参见: LOS_HighBitGet

自从: Huawei LiteOS V100R001C00