这个单片机程序运行了好多次找不出在哪里错误，哪位大佬帮我看下

ID:563314 · 发表于 2019-6-15 22:43

#include<reg51.h>
#define uchar unsigned char
uchar times;
sbit g1=P1^0;
sbit g2=P1^1;
sbit g3=P1^2;
sbit g4=P1^3;
sbit s1=P3^2;
sbit s2=P3^3;
bit flag;
void delay(uchar a)
{
times=a*20;
while(times)
      {
      while(TF0==0);
      TF0=0;
      TH0=(65536-50000)/256;
      TL0=(65536-50000)%256;
      times--;
      }
}
void ext0() interrupt 0
{
TR0=1;
flag=1;
}
void ext1() interrupt 2
{
TR0=0;
flag=0;
}
main()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EX0=1;
EX1=1;
EA=1;
IT0=1;
IT1=1;
flag=0;
times=0;
while(1)
      {
      while(flag)
            {
            g1=0;g2=1;g3=1;g4=1;delay(2);g1=1;delay(1);
            g1=1;g2=1;g3=0;g4=1;delay(2);g3=1;delay(1);
            g1=1;g2=1;g3=1;g4=0;delay(2);g4=1;delay(1);
            g1=1;g2=0;g3=1;g4=1;delay(2);g2=1;delay(1);
            }
      }
}