#include "reg52.h"
typedef unsigned int u16;
typedef unsigned char u8;
sbit beep=P2^5;
sbit k1=P3^1;
u8 ding,dong,flag,stop;
u16 n;
void delay(u16 i)
{
while(i--);
}
void time0init()
{
TMOD=0X01;
TH0=0Xff;
TL0=0X06;
TR0=1;
EA=1;
ET0=1;
}
void biaohaoinit()
{
ding=0;
dong=0;
n=0;
flag=0;
stop=0;
}
void main()
{
time0init();
biaohaoinit();
while(1)
{
if(k1==0)
{
delay(1000);
if(k1==0)
{
TR0=1;
while(!stop);
}
}
}
}
void time0() interrupt 1
{
n++;
TH0=0Xff;
TL0=0X06; //250us
if(n==2000)
{
n=0;
if(flag==0)
{
flag=~flag;
}
else
{
flag=0;
stop=1;
TR0=0;
}
}
if(flag==0)
{
ding++;
if(ding==1)
{
ding=0;
beep=~beep;
}
}
else
{
dong++;
if(dong==2)
{
dong=0;
beep=~beep;
}
}
}
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