4x4key.lst

基于51系列单片机的4×4矩阵式键盘识别.正在学习单片机

C51 COMPILER V6.12  4X4KEY                                                                 03/27/2006 23:21:37 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE 4X4KEY
OBJECT MODULE PLACED IN .\4X4KEY.OBJ
COMPILER INVOKED BY: D:\Program Files\Keil\C51\BIN\C51.EXE .\4X4KEY.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <reg52.h>
   2          unsigned char code seg7code[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 
   3                                        0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; //LED段码
   4          unsigned char k;
   5          
   6          void delay10ms(void) //延时程序
   7          { 
   8   1      	unsigned char i,j; 
   9   1      	for(i=20;i>0;i--) 
  10   1      	for(j=248;j>0;j--); 
  11   1      } 
  12           void Getch (  )
  13          {   unsigned char X,Y,Z;
  14   1      	P3=0xff;
  15   1      	P3=0x0f;       //先对P3置数  行扫描
  16   1      	if(P3!=0x0f)     //判断是否有键按下
  17   1      	{delay10ms();    //延时,软件去干扰
  18   2      	 if(P3!=0x0f)   //确认按键按下X = P3;
  19   2      	{
  20   3      	X=P3;          //保存行扫描时有键按下时状态
  21   3      	P3=0xf0;       //列扫描
  22   3      	Y=P3;          //保存列扫描时有键按下时状态
  23   3       	Z=X|Y;         //取出键值
  24   3      	switch ( Z )   //判断键值（那一个键按下）
  25   3      	{
  26   4      		case 0xee: k=0; break; //对键值赋值
  27   4      		case 0xde: k=1; break; 
  28   4      		case 0xbe: k=2; break; 
  29   4      		case 0x7e: k=3; break; 
  30   4      		case 0xed: k=4; break; 
  31   4      		case 0xdd: k=5; break; 
  32   4      		case 0xbd: k=6; break; 
  33   4      		case 0x7d: k=7; break; 
  34   4      		case 0xeb: k=8; break; 
  35   4      		case 0xdb: k=9; break; 	
  36   4      		case 0xbb: k=10;break; 
  37   4      		case 0x7b: k=11;break; 
  38   4      		case 0xe7: k=12;break; 
  39   4      		case 0xd7: k=13;break; 
  40   4      		case 0xb7: k=14;break; 
  41   4      		case 0x77: k=15;break; 
  42   4      	}
  43   3      	}
  44   2      	}
  45   1      }
  46          void main(void)
  47          { 
  48   1        while(1)
  49   1       { P3=0xff;
  50   2         Getch();
  51   2         P0=seg7code[k];//查表LED输出
  52   2         P2=0x0f;    //输出相同的四位数据。
  53   2        }
  54   1      }

C51 COMPILER V6.12  4X4KEY                                                                 03/27/2006 23:21:37 PAGE 2   


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    184    ----
   CONSTANT SIZE    =     16    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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