人机界面——蜂鸣器设计

DongInker

static   u8  beeper_on_timer = 0,beeper_off_timer = 0,BeepNum = 0;

static u16  BeepCnt = 0;

void SetBeep(u8 num,u8 time_on,u8 time_off)     //用户调用函数 ｛次数，开时间，关时间）单位10mS 其中num=0xff为连续模式

{

BeepNum = num;

beeper_on_timer  = time_on;

beeper_off_timer = time_off;

SetBeeper(0);

BeepCnt = 0;

}

void ProF_10mS_Beeper(void) //定期器10mS调度任务

{

if(BeepCnt)

{

BeepCnt--;

if(BeepCnt == beeper_off_timer)

SetBeeper(0);

}

else

{

if(BeepNum == 0XFF)

{

SetBeeper(1);

BeepCnt = beeper_on_timer + beeper_off_timer;

}

else if(BeepNum)

{

SetBeeper(1);

BeepNum --;

BeepCnt = beeper_on_timer + beeper_off_timer;

}

}

}

sbit  IN_LED         = P4^7;

void SetBeeper(u8 high)   //蜂鸣器接口

{

if(high)

PIN_LED = 1;

else

PIN_LED = 0;

}

青苹果PAD

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