unsigned char rfcount,
         loop,
         rftime,    //查詢定時器
         k;
bit    rfbit,       //接收完標(biāo)記
       lowbit1,
       lowbit2,
       downbit,     //檢測下降沿標(biāo)記
       rfgobit;
unsigned char rcvData[5];//結(jié)果


////////////////////////////////////////////////////////////////////////////////
IR_rcv( )//遙控接收
{
        if(rfbit==0)                     //準(zhǔn)備接收
        {
        if((lowbit1==0)&&(RB5==0))       //RB5口用做接收口,有低電平        
        {
        downbit=1;
        rftime=0;
        lowbit1=1;
        return;
        }
        if((lowbit1==1)&&(RB5==1))       //有由低變高電平 
        {
        lowbit2=1;
        return;
        }
        if((lowbit1==1)&&(lowbit2==1)&&(RB5==0))
        {
        lowbit1=0;
        lowbit2=0;
        if((rftime>=40)&&(downbit==1))  //遙控接收(4.5ms start ?)
        {
        rfgobit=1;
        loop=0;
        rfcount=0;
        k=1;
        rftime=0;
        return;
        }
        rfcount +=1;
        loop +=1;
        if(rfcount>=31)                //接收了32位數(shù)據(jù)                 
        {
        rfgobit=0;                     //清0
        downbit=0;
        rfcount=0;
        rfbit=1;
        loop=0;
        return;
        }
        if((rftime>=7)&&(rfgobit==1))     //(2.25ms----1)?
        {
        rcvData[k] |=0x80;                //1?
        rftime=0;
        if(loop==8)
        {
        k += 1;
        loop=0;
        return;
        }
        rcvData[k]>>=1;
        return;
        }
        if((rftime<5)&&(rfgobit==1))     //(1.12ms----0)?
        {
        rcvData[k] &=0x7f;               //0 ?
        rftime=0;
        if(loop==8)
        {
        k += 1;
        loop=0;
        return;
        }
        rcvData[k] >>=1;               //rcvData[5]?只有32位定義5個數(shù)組干什么?
        return;                        //多出的一個數(shù)組有何用？
        }
      }
    }
}