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51单片机配套C程序

C51 COMPILER V7.50   KEYBOARD                                                              05/30/2010 14:04:11 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE KEYBOARD
OBJECT MODULE PLACED IN keyboard.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE keyboard.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*-----------------------------------------------
   2          矩阵键盘实验程序
   3                 通过反转法循环扫描矩阵键盘，并通过数码管显示数据
   4          ------------------------------------------------*/
   5          #include<reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义
   6          
   7          #define uchar unsigned char
   8          #define uint  unsigned int
   9          
  10          unsigned char const EL[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
  11                                                   0x77,0x7c,0x39,0x5e,0x79,0x71};//0-F
  12          /*------------------------------------------------
  13                             函数声明
  14          ------------------------------------------------*/ 
  15          uchar keyscan(void);//键盘扫描
  16          void delay(uint i); //演示程序
  17          /*------------------------------------------------
  18                             主函数
  19          ------------------------------------------------*/
  20          void main()
  21          {
  22   1       uchar key;
  23   1       P2=0;        //1数码管亮 按相应的按键，会显示按键上的字符
  24   1       P0=0X00;
  25   1       while(1)
  26   1      {
  27   2       key=keyscan();  //调用键盘扫描，
  28   2       switch(key)
  29   2       {
  30   3        
  31   3      
  32   3                      case 0xee:P0=EL[0];break;//0按下相应的键显示相对应的码值
  33   3                      case 0xde:P0=EL[1];break;//1 按下相应的键显示相对应的码值 
  34   3                      case 0xbe:P0=EL[2];break;//2
  35   3                      case 0x7e:P0=EL[3];break;//3
  36   3                      case 0xed:P0=EL[4];break;//4
  37   3                      case 0xdd:P0=EL[5];break;//5
  38   3                      case 0xbd:P0=EL[6];break;//6
  39   3                      case 0x7d:P0=EL[7];break;//7
  40   3                      case 0xeb:P0=EL[8];break;//8
  41   3                      case 0xdb:P0=EL[9];break;//9
  42   3                      case 0xbb:P0=EL[10];break;//a
  43   3                      case 0x7b:P0=EL[11];break;//b
  44   3                      case 0xe7:P0=EL[12];break;//c
  45   3                      case 0xd7:P0=EL[13];break;//d
  46   3                      case 0xb7:P0=EL[14];break;//e
  47   3                      case 0x77:P0=EL[15];break;//f
  48   3        
  49   3       }
  50   2       }
  51   1      }
  52          /*------------------------------------------------
  53                        键盘扫描程序
  54          ------------------------------------------------*/
  55          uchar keyscan(void)  //键盘扫描函数，使用行列反转扫描法
C51 COMPILER V7.50   KEYBOARD                                                              05/30/2010 14:04:11 PAGE 2   

  56          {
  57   1       uchar cord_h,cord_l;//行列值中间变量
  58   1       P3=0x0f;            //行线输出全为0
  59   1       cord_h=P3&0x0f;     //读入列线值
  60   1       if(cord_h!=0x0f)    //先检测有无按键按下
  61   1       {
  62   2        delay(100);        //去抖
  63   2        if(cord_h!=0x0f)
  64   2        {
  65   3          cord_h=P3&0x0f;  //读入列线值
  66   3          P3=cord_h|0xf0;  //输出当前列线值
  67   3          cord_l=P3&0xf0;  //读入行线值
  68   3          return(cord_h+cord_l);//键盘最后组合码值
  69   3         }
  70   2        }return(0xff);     //返回该值
  71   1      }
  72          /*------------------------------------------------
  73                           延时程序
  74          ------------------------------------------------*/
  75          void delay(uint i)  //延时函数
  76          {
  77   1      while(i--);
  78   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    205    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     16       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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