四路抢答器.lst

四路抢答器 单片机开发 可以四人一起抢答 功能强大

C51 COMPILER V7.50   四路抢答芲                                                            05/29/2007 20:06:31 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE 四路抢答芲
OBJECT MODULE PLACED IN 四路抢答器.OBJ
COMPILER INVOKED BY: D:\实用工具\Keil\C51\BIN\C51.EXE 四路抢答器.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg51.h>
   2          sbit P2_0=P2^0;
   3          sbit P2_2=P2^2;
   4          unsigned char GroupNo;
   5          unsigned char code Seg3code[5]={0x3f,0x06,0x5b,0x4f,0x66};//0到4的代码
   6          
   7          void delay(void)//延迟1毫秒
   8          {
   9   1       unsigned char i;
  10   1       for(i=0;i<250;i++);
  11   1      }
  12          
  13          void ShowGroup(unsigned char n)//显示出第几组
  14          {
  15   1       P1=Seg3code[n];
  16   1      }
  17          
  18          unsigned char KeySweep(void)//键盘扫描，获取组数
  19          {
  20   1       unsigned char temp,n=0;
  21   1       if(P3!=0xff)               //若有选手抢答
  22   1       {
  23   2        delay();                  //延时消抖
  24   2        if(P3!=0xff)
  25   2        temp=~P3;
  26   2       }
  27   1       while(temp!=0)
  28   1       {
  29   2        temp=temp>>1;
  30   2        n++;
  31   2       }
  32   1       return n;                 //返回组数
  33   1      }
  34          
  35          void timer0(void) interrupt 1
  36          {
  37   1       static unsigned j;
  38   1       TH0=(65536-50000)/256;//装载计数初值
  39   1       TL0=(65536-50000)%256;
  40   1       j++;
  41   1       if(j%20==0)
  42   1       {
  43   2        EA=0;
  44   2       }
  45   1       P2_0=~P2^0;
  46   1      }
  47          
  48          void Time0(void)//定时器0初始化
  49          {
  50   1       TMOD=(TMOD&0xF0)|0x01;//定时器0方式1
  51   1       TH0=(65536-50000)/256;//装载计数初值
  52   1       TL0=(65536-50000)%256;
  53   1       ET0=1;                //CPU开中断
  54   1       TR0=1;                //启动T/C0开始定时
  55   1      }
C51 COMPILER V7.50   四路抢答芲                                                            05/29/2007 20:06:31 PAGE 2   

  56           
  57          void main()
  58          {
  59   1       Time0();
  60   1       while(1)
  61   1       {
  62   2        P3=0xff;
  63   2        ShowGroup(0);
  64   2        while(P3==0xff);
  65   2        GroupNo=KeySweep();
  66   2        ShowGroup(GroupNo);
  67   2        EA=1;//CPU开中断，进入中断程序
  68   2        while(P2_2==1);//若主持人无按键按下
  69   2        delay();       //延时消抖
  70   2        while(P2_2==1);
  71   2        EA=0;//CPU关中断
  72   2        }
  73   1      }
  74          
  75              
  76          
  77          
  78          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    177    ----
   CONSTANT SIZE    =      5    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      3    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)