while ( 1 )
     {   
                     status = PcdRequest(PICC_REQALL, g_ucTempbuf);//寻卡
           
         if (status != MI_OK)
                  {    LED_2  =1;
         delay(2000);
        LED_2  =0;
        delay(2000);
         LED_2=1;
        delay(2000);
    continue;     }
          else
            //display_type();//寻到卡后显示出该卡的类型
              LED_1  =0;
         delay(2000);
        LED_1  =1;
        delay(2000);
         LED_1=0;
        delay(2000);
               //printf("卡的类型:");
            for(i=0;i<2;i++)
                    {
                        temp=g_ucTempbuf[i];
                        printf("%X",temp);
                        
                    }
            
         status = PcdAnticoll(g_ucTempbuf);//防冲撞
         if (status != MI_OK)
         {    continue;    }
         else
                       display_cardnum();//显示寻到的卡的序列号

            }
      }

这是在Keil软件里编译的单片机程序

LED_2  =1;
         delay(2000);
        LED_2  =0;
        delay(2000);
         LED_2=1;
        delay(2000);
这是一个灯闪烁，
  LED_1  =0;
         delay(2000);
        LED_1  =1;
        delay(2000);
         LED_1=0;
        delay(2000);
这是另外一个灯闪烁，根据灯的闪烁判断程序执行到哪一步

多谢多谢，明白了