# include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
sbit dawr=P3^6;
sbit dacs=P3^2;
sbit P10=P1^0;  //LED represent 1310nm
sbit P11=P1^1;  //LED represent 1490nm
sbit P12=P1^2;  //LED represent 1550nm
sbit P13=P1^3;  //LED represent com
sbit P20=P2^0;  //com
sbit P21=P2^1;  //1550nm
sbit P22=P2^2;  //1490nm
sbit P23=P2^3;  //1310nm

void main()
{uchar val;
 dula=0;
 wela=0;
 dacs=0;
 dawr=0;
 while(1)       //设定一个2.5V的参考电压
 {P0=130;
  }      

NORM:unit i,j,k,ll;
    i=j=k=ll=0;
    while(i<256&&j<256&&k<256)
{
     val=P20*1000+P21*100+P22*10+P23;
     switch(val)
    {case 0001:
      case 0000: goto ERRO_1;
      case 1000: goto ERRO_2;
      case 1001: i++;j=k=0;break;
      case 1010: j++;i=k=0;break;
      case 1011: i++;j++;k=0;break;
      case 1100: k++;i=0;j=0;break;
      case 1101: i++;k++;j=0;break;
      case 1110: j++;k++;i=0;break;
      case 1111:
      default:   i=j=k=0;break;
    }

}
ERRO:  if (i==256&&j==256)  //failure in 1550nm
          {while(1)
            {P13=1;
                P12=1;
               P11=0;
               P10=1;
              }
          }
            else if (i==256&&k==256)   //failure in 1490nm
                  {while(1)
                       {P13=1;
                           P12=0;
                          P11=1;
                          P10=1;
                         }
                   }
                else if (j==256&&k==256)   //failure in 1310nm
                       {while(1)
                       {P13=1;
                           P12=1;
                          P11=1;
                          P10=0;
                         }
                   }
        else goto NORM;

ERRO_1:if (P20==0&&P23==1)//failure in com port
         while (1)
       {
        P13=0;
        P12=1;
        P11=1;
        P10=1;
        }
        else ll++
           {if(ll<256) goto NORM;
           else while(1) //failure in both 1310nm port and com port  
           { P13=0;
             P12=0;
             P11=0;
             P10=0;
             }
           }
ERRO_2:unit i,j,k,ll;
       i=j=k=0;
       while (i<256&&j<256)
      { if (P21==1&&P22==1)//故障排除
       goto NORM
       if (P21==0&&P22==1) i++;j=0;
       if (P21==0&&P22==1) j++;i=0;
       else i++;j++;
         }
     if (i==256)      //failure in 1490nm
        {while(1)
            {P13=1;
             P12=0;
             P11=1;
             P10=1;
            }
         }
    else if (j==256)  //failure in 1550nm
        {while(1)
            {P13=1;
             P12=1;
             P11=0;
             P10=1;
            }
         }
}

[ 本帖最后由 flyfx1989 于 2011-7-1 22:04 编辑 ]

刚发现了我把 uint 给写错了，可是还是不对啊，怎么办呢

可以在主函数数前面定义一下看看

把NORM：移到下一行就行了。

在51编程中，所有的定义，均必须放在函数前面，最好main下面就定义数据

你这个函数里，定义要在主函数前。

以上各位的建议简单来讲，就是这样定义：
void main(){
    uint i, j;    // 紧接 main()
    // ...