keyboard.lst

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C51 COMPILER V7.06   KEYBOARD                                                              10/09/2008 23:13:20 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE KEYBOARD
OBJECT MODULE PLACED IN keyboard.OBJ
COMPILER INVOKED BY: d:\Keil2\C51\BIN\C51.EXE keyboard.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          
   2          //行列扫描程序，可以自己定义端口和扫描方式，这里做简单介绍
   3          #include <reg52.h>//包含头文件
   4          #define uchar unsigned char
   5          #define uint  unsigned int
   6           
   7          uchar keyscan(void);
   8          void delay(uint i);
   9          
  10          void main()
  11          {
  12   1       uchar key;
  13   1       P2=0x00;//8数码管亮 按相应的按键，会显示按键上的字符
  14   1       while(1)
  15   1      {
  16   2       key=keyscan();//调用键盘扫描，
  17   2       switch(key)
  18   2       {
  19   3        case 0x7e:P0=0xc0;break;//0 按下相应的键显示相对应的码值
  20   3        case 0x7d:P0=0xf9;break;//1
  21   3        case 0x7b:P0=0xa4;break;//2
  22   3        case 0x77:P0=0xb0;break;//3
  23   3        case 0xbe:P0=0x99;break;//4
  24   3        case 0xbd:P0=0x92;break;//5
  25   3        case 0xbb:P0=0x82;break;//6
  26   3        case 0xb7:P0=0xf8;break;//7
  27   3        case 0xde:P0=0x80;break;//8
  28   3        case 0xdd:P0=0x90;break;//9
  29   3        case 0xdb:P0=0x88;break;//a
  30   3        case 0xd7:P0=0x83;break;//b
  31   3        case 0xee:P0=0xc6;break;//c
  32   3        case 0xed:P0=0xa1;break;//d
  33   3        case 0xeb:P0=0x86;break;//e
  34   3        case 0xe7:P0=0x8e;break;//f
  35   3       }
  36   2       }
  37   1      }
  38          uchar keyscan(void)//键盘扫描函数，使用行列反转扫描法
  39          {
  40   1       uchar cord_h,cord_l;//行列值
  41   1       P3=0x0f;            //行线输出全为0
  42   1       cord_h=P3&0x0f;     //读入列线值
  43   1       if(cord_h!=0x0f)    //先检测有无按键按下
  44   1       {
  45   2        delay(100);        //去抖
  46   2        if(cord_h!=0x0f)
  47   2        {
  48   3          cord_h=P3&0x0f;  //读入列线值
  49   3          P3=cord_h|0xf0;  //输出当前列线值
  50   3          cord_l=P3&0xf0;  //读入行线值
  51   3          return(cord_h+cord_l);//键盘最后组合码值
  52   3         }
  53   2        }return(0xff);     //返回该值
  54   1      }
  55          
C51 COMPILER V7.06   KEYBOARD                                                              10/09/2008 23:13:20 PAGE 2   

  56          void delay(uint i)//延时函数
  57          {
  58   1      while(i--);
  59   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    203    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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