更新时间:2021-07-08 GMT+08:00
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编程实例

实例描述

对数据实现位操作,本实例实现如下功能:

  1. 某一标志位置1。
  2. 获取标志位为1的最高bit位。
  3. 某一标志位清0。
  4. 获取标志位为1的最低bit位。

编程示例

#include "los_bitmap.h"
#include "los_printf.h"

static UINT32 Bit_Sample(VOID)
{
  UINT32 flag = 0x10101010;
  UINT16 pos;

  dprintf("\nBitmap Sample!\n");
  dprintf("The flag is 0x%8x\n", flag);

  pos = 8;
  LOS_BitmapSet(&flag, pos);
  dprintf("LOS_BitmapSet:\t pos : %d, the flag is 0x%0+8x\n", pos, flag);

  pos = LOS_HighBitGet(flag);
  dprintf("LOS_HighBitGet:\t The highest one bit is %d, the flag is 0x%0+8x\n", pos, flag);

  LOS_BitmapClr(&flag, pos);
  dprintf("LOS_BitmapClr:\t pos : %d, the flag is 0x%0+8x\n", pos, flag);

  pos = LOS_LowBitGet(flag);
  dprintf("LOS_LowBitGet:\t The lowest one bit is %d, the flag is 0x%0+8x\n\n", pos, flag);

  return LOS_OK;
}

结果验证

编译运行得到结果:

Bitmap Sample!
The flag is 0x10101010
LOS_BitmapSet: pos : 8,  the flag is 0x10101110
LOS_HighBitGet:The highest one bit is 28, the flag is 0x10101110
LOS_BitmapClr: pos : 28, the flag is 0x00101110
LOS_LowBitGet: The lowest one bit is 4, the flag is 0x00101110
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