key.lst

基于DAC0832的简单波形发生器

C51 COMPILER V8.05a   KEY                                                                  03/25/2009 14:01:50 PAGE 1   


C51 COMPILER V8.05a, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN key.OBJ
COMPILER INVOKED BY: D:\学习\Keil 3\C51\BIN\C51.EXE key.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg52.h>
   2          #include<key.h>
   3          
   4          static void delay(void);
   5          void delay(void)                              //延时子程序
   6          {
   7   1       unsigned char n, m;
   8   1       for (n = 100; n > 0; n--)
   9   1        for (m = 300; m > 0; m--);    
  10   1      }
  11          uchar KeyScan(void)            //按键扫描程序 P1.0--P1.3为行线 P1.4--P1.7为列线
  12          {
  13   1        uchar rcode, ccode;
  14   1        PX = 0xF0;                         // 发全0行扫描码，列线输入
  15   1        if((PX&0xF0) != 0xF0)              // 若有键按下
  16   1        {
  17   2          delay();                        // 延时去抖动 
  18   2          if((PX&0xF0) != 0xF0)
  19   2          {  rcode = 0xFE;               // 逐行扫描初值
  20   3          while((rcode&0x10) != 0)
  21   3          {
  22   4             PX = rcode;                  // 输出行扫描码
  23   4          if((PX&0xF0) != 0xF0)           // 本行有键按下
  24   4          {
  25   5             ccode = (PX&0xF0)|0x0F;
  26   5             do{;}while((PX&0xF0) != 0xF0); //等待键释放
  27   5             return ((~rcode) + (~ccode)); // 返回键编码
  28   5          }
  29   4          else
  30   4          rcode = (rcode<<1)|0x01; // 行扫描码左移一位
  31   4          }
  32   3       }
  33   2        }  
  34   1        return 0; // 无键按下，返回值为0
  35   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     81    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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