lcd1602.lst

四位液晶显示的频率计,可最大测大65KHZ

C51 COMPILER V8.02   LCD1602                                                               07/08/2008 20:47:02 PAGE 1   


C51 COMPILER V8.02, COMPILATION OF MODULE LCD1602
OBJECT MODULE PLACED IN lcd1602.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE lcd1602.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include"lcd1602.h"
   2          uchar  date[2];
   3          
   4          
   5          
   6          void delay(uchar ms)
   7          {       // 延时子程序
   8   1         uchar i;
   9   1         while(ms--)
  10   1            {
  11   2              for(i = 0; i< 250; i++)
  12   2               {
  13   3                 _nop_();
  14   3                 _nop_();
  15   3                 _nop_();
  16   3                 _nop_();
  17   3               }
  18   2            }
  19   1      }
  20          
  21          BOOL LCD_check_busy()             //定义LCD_check_busy()返回值是位
  22             {       // 测试LCD忙碌状态
  23   1           BOOL result;
  24   1           rs = 0;
  25   1           rw = 1;
  26   1           ep = 1;
  27   1           result = (BOOL)(LCD_DATA&0x80);     //读取第八位
  28   1           ep = 0;
  29   1           return result;                              //返回检测信号
  30   1         }
  31          
  32          void lcd_write(uchar cd,uchar temp)
  33             {      // 写入指令数据到LCD
  34   1            uchar i; 
  35   1            while(LCD_check_busy());
  36   1            date[0]=temp&0xf0;  //取高四位
  37   1            date[1]=(temp<<4)&0xf0; //取低四位
  38   1            for(i=0;i<2;i++)            //循环二次，分别送数据的高低位
  39   1              {
  40   2                if(cd)                          //当写数据时使RS=1，当为写指令时RS=0
  41   2                  rs = 1;
  42   2                else
  43   2                  rs=0;
  44   2                rw = 0;
  45   2                ep = 0;
  46   2                LCD_DATA  = date[i];                    //送数据到LCD
  47   2                if(cd)                             //保持RS原来的状态，不然会使送数据失败
  48   2                 rs = 1;
  49   2                else
  50   2                 rs=0;
  51   2                ep = 1;
  52   2                ep = 0; 
  53   2              } 
  54   1          }
  55          
C51 COMPILER V8.02   LCD1602                                                               07/08/2008 20:47:02 PAGE 2   

  56          void lcd_pos(uchar pos)
  57            {     
  58   1          lcd_write(0,pos|0x80);              //设定显示位置
  59   1        }
  60          
  61          
  62          void lcd_init()
  63             {       //LCD初始化设定
  64   1       
  65   1           lcd_write(0,0x38);   //写三个0x38是初始化要求
  66   1           delay(1);
  67   1               lcd_write(0,0x38);   
  68   1           delay(1);
  69   1           lcd_write(0,0x38);   
  70   1           delay(1);
  71   1           lcd_write(0,0x28);   // 四位数据数、双行显示、5X7点阵字型体
  72   1           delay(1);
  73   1           lcd_write(0,0x0C);   // 显示开、关光标
  74   1           delay(1);
  75   1               
  76   1           lcd_write(0,0x06);   // 数据读、写操作后，AC自动增一
  77   1           delay(1);
  78   1               lcd_write(0,0x18);                                     
  79   1           delay(1);
  80   1           lcd_write(0,0x01);   //清除LCD的显示内容
  81   1           delay(1);
  82   1         }
  83                     
  84          void lcd_strwdat( uchar Loc,uchar *str )
  85          {                                                                         //写入字符串显示数据到LCD
  86   1          lcd_pos(Loc);
  87   1          while(*str!='\0')
  88   1            {
  89   2              lcd_write(1,*str);
  90   2                  str++;
  91   2            }
  92   1      }
  93                                  


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    203    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      2    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----       1
END OF MODULE INFORMATION.


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