[求助]为什么51单片机中断后一直卡死在中断，不会继续往下执行，也不会返回主程序

ID:95556 · 发表于 2015-11-13 15:07

#include<reg52.h>
sbit P33=P3^3;
char code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};    //共阳数码管，不带小数点
char code tab1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};    //共阳数码管，带小数点
unsigned int num=0,b;

void show(int z);
void delay(unsigned  char a);

void main(void)
{
SP=0x60;
TMOD=0x01;
IE=0x87;
TCON=0x05;
while(1)
{
unsigned char i;
      P1=0x7b;    //东西方向绿灯亮，南北方向红灯亮
show(14);
for(i=0;i<4;i++)
{
      P1=0xbb;
      show(1);
P1=0xfb;
      show(1);
}

P1=0xde;    //东西方向红灯亮，南北方向绿灯亮
      show(12);
for(i=0;i<4;i++)
{
      P1=0xdd;
      show(1);
P1=0xdf;
     show(1);
}
}
}

void show(int z)             //用数码管显示的倒计时
{
int z1,z2;
TR0=1;
if(z>1)
{
   while(z>0)
   {
      if(b==20) {b=0;z--;}
   z1=z/10;
         z2=z%10;
   P0=tab[z1];
   P2=0xfb;
   delay(20);

   P0=tab[z2];
   P2=0xf7;
   delay(20);
   }
}
else
{
   while(z>0)
   {
      if(b==10) {b=0;z--;}
   P0=tab1[0];
   P2=0xfb;
   delay(20);

   P0=tab[5];
   P2=0xf7;
   delay(20);
   }
}
}

void delay(unsigned  char a)
{
char k1;
for(k1=0;k1<=a;k1++);
}

void time0() interrupt 1
{
TH0=(65536-5*110592/12)/256;
TL0=(65536-5*110592/12)%256;
b++;
}

void int0(void) interrupt 0    //紧急车辆要通过,主干道、支道均为红灯亮6秒
{
unsigned char j1;
j1=P1;
P1=0xdb;
show(6);
P1=j1;
}

void int1(void) interrupt 2    //累计8辆车，放行支道
{
unsigned char i1;
if(P33==0)
{
   delay(60);
   if(P33==0){ num++; }
   while(P33==0);
}

if(P1==0x7b){    //主干道放行期间
   if(num>7){
   for(i1=0;i1<4;i1++)
   {
   P1=0xbb;
   show(1);
   P1=0xfb;
   show(1);
   }
   P1=0xde;    //东西方向红灯亮，南北方向绿灯亮
   show(12);
   num=0;
}
  }
  else {num=0;}
}