單片機門鈴程序哪里有錯啊，找不出來

ID:616198 · 發(fā)表于 2020-6-15 18:45

#include<AT89X51.H>
unsigned char t5hz;
unsigned char t7hz;
unsigned int tcnt;
bit stop;
bit flag;
void main(void)
{
unsigned char i,j;
TMOD=0x02;
TH0=0x06;
ET0=1;
EA=1;
while(1)
{
if(P3_7==0)
{
for(i=10;i>0;i--)
for(j=248;j>0;j--)
if(P3_7==0)
{
t5hz=0;
t7hz=0;
tcnt=0;
flag=0;
stop=0;
TR0=1;
while(stop==0);
}
   }
   }
  }
  void t0(void) interrupt 1 using 0
  {
    tcnt++;
if(tcnt==2000)
    {
tcnt=0;
if(flag==0)
{
flag=~flag;
}
else
{
   stop=1;
   TR0=0;
}
}
if(flag==0)
t7hz++;
if(t7hz==3)
{
t7hz=0;
P1_0=~P1_0;
}
  }
  else
  {
    t5hz++;
if(t5hz==4)
{
t5hz=0;
P1_0=~P1_0;
}
  }