单片机抢答器程序

#include
#define uchar unsigned char
#define uint unsigned int

void delay(uint);
void sysini(void);

/************************************************************
*本程序版权所有
*http://www.51hei.com  荣誉出品
*c语言编写的单片机抢答器程序已经测试成功，大家烧写到芯片中就可以直接使用了
*************************************************************/

void main(void)
{sysini();

while(1)
   {

   P2=0x3f;
   P2=0x3f;
   if(P1!=0xff)
      {P2=0x7c;
       P3_1=0;
       delay(65535);
       P3_1=1;
       continue;
      }
   while(P1==0xff);                  //循环判断 等待按键，同时显示0
                                     //读取数据
   switch(P1)
     {case 0xfe:P2=0x03;break; //1
      case 0xfd:P2=0x6d;break; //2
      case 0xfb:P2=0x67;break; //3
      case 0xf7:P2=0x53;break; //4
      case 0xef:P2=0x76;break; //5
      case 0xdf:P2=0x7e;break; //6
      case 0xbf:P2=0x23;break; //7
      case 0x7f:P2=0x7f;break; //8
      default: P2=0x7c;
    }
   P3_1=0;
   delay(65535);
   P3_1=1;
 
   while(P3_2)
     {if(!P3_2) break;
      if(!P3_2) break;
      if(!P3_2) break;
      if(!P3_2) break;
   }

   }
    

}

    
void delay(uint a)
{uint i;
 for(i=0;i  ;
}

void sysini(void)
{P2=0x00;delay(10000);
 P2=0x01;delay(10000);
 P2=0x02;delay(10000);
 P2=0x04;delay(10000);
 P2=0x08;delay(10000);
 P2=0x10;delay(10000);
 P2=0x20;delay(10000);
 P2=0x00;delay(40000);
 

 P2=0x38;delay(40000);
 P2=0x00;delay(40000);
 P2=0x7b;delay(40000);
 P2=0x00;delay(40000);
 P2=0x7b;delay(40000);
 P2=0x00;delay(40000);

 P2=0x01;delay(30000);
 P2=0x03;delay(30000);
 P2=0x07;delay(30000);
 P2=0x0f;delay(30000);
 P2=0x1f;delay(30000);
 P2=0x3f;delay(30000);
}

  
  
---------下面还介绍一个汇编语言编程的单片机抢答器程序原理请读者自行分析-------------------

        C0002: 
        MOV     P2,#0C0H
        C0004:
 MOV     A,P1
 CPL     A
 JZ      C0004
 C0005:
        MOV     R7,P1
        MOV     A,R7
        ADD     A,#081H
        JZ      C0014
        ADD     A,#0C0H
        JZ      C0013
        ADD     A,#0E0H
        JZ      C0012
        ADD     A,#0F0H
        JZ      C0011
        ADD     A,#0F8H
        JZ      C0010
        ADD     A,#0FCH
        JZ      C0009
        ADD     A,#0FEH
        JZ      C0008
        DEC     A
        JNZ     C0015
        C0007:
        MOV     P2,#0FCH
        SJMP    C0016
        C0008:
        MOV     P2,#092H
        SJMP    C0016
        C0009:
        MOV     P2,#098H
        SJMP    C0016
        C0010:
        MOV     P2,#0ACH
        SJMP    C0016
        C0011:
        MOV     P2,#089H
        SJMP    C0016
        C0012:
        MOV     P2,#081H
        SJMP    C0016
        C0013:
        MOV     P2,#0DCH
        SJMP    C0016
        C0014:
        MOV     P2,#080H
        SJMP    C0016
        C0015:
        MOV     P2,#088H
        C0016:
        JNB     P3_1,C0002
        SJMP    C0016m