lcd_parallel.lst

51单片机的1602液晶显示程序

C51 COMPILER V7.20   LCD_PARALLEL                                                          08/12/2007 17:35:12 PAGE 1   


C51 COMPILER V7.20, COMPILATION OF MODULE LCD_PARALLEL
OBJECT MODULE PLACED IN lcd_parallel.OBJ
COMPILER INVOKED BY: C:\Program File\Keil\C51\BIN\C51.EXE lcd_parallel.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include  "reg52.h"
   2          
   3          sbit LCD_RS= P2^0;
   4          sbit LCD_RW= P2^1; //定义引脚
   5          sbit LCD_E= P2^2;
   6          
   7          #define LCD_Data P0
   8          #define Busy 0x80 //用于检测LCD状态字中的Busy标识
   9          
  10          
  11          
  12          void WriteDataLCD(unsigned char WDLCD);
  13          void WriteCommandLCD(unsigned char WCLCD,BuysC);
  14          unsigned char ReadDataLCD(void);
  15          unsigned char ReadStatusLCD(void);
  16          void LCDInit(void);
  17          void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
  18          void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
  19          void Delay5Ms(void);
  20          void Delay400Ms(void);
  21          
  22          unsigned char code cdle_net[] = {"www.cdle.net"};
  23          unsigned char code email[] = {"[e-mail]"};
  24          
  25          void main(void)
  26          {
  27   1      Delay400Ms(); //启动等待，等LCD讲入工作状态
  28   1      LCDInit(); //LCD初始化
  29   1      Delay5Ms(); //延时片刻(可不要)
  30   1      
  31   1      DisplayListChar(0, 0, cdle_net);
  32   1      DisplayListChar(0, 1, email);
  33   1      ReadDataLCD();//测试用句无意义
  34   1      while(1);
  35   1      }
  36          
  37          //写数据
  38          void WriteDataLCD(unsigned char WDLCD)
  39          {
  40   1      ReadStatusLCD(); //检测忙
  41   1      LCD_Data = WDLCD;
  42   1      LCD_RS = 1;
  43   1      LCD_RW = 0;
  44   1      LCD_E = 0; //若晶振速度太高可以在这后加小的延时
  45   1      LCD_E = 0; //延时
  46   1      LCD_E = 1;
  47   1      }
  48          
  49          //写指令
  50          void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC为0时忽略忙检测
  51          {
  52   1      if (BuysC) ReadStatusLCD(); //根据需要检测忙
  53   1      LCD_Data = WCLCD;
  54   1      LCD_RS = 0;
  55   1      LCD_RW = 0; 
C51 COMPILER V7.20   LCD_PARALLEL                                                          08/12/2007 17:35:12 PAGE 2   

  56   1      LCD_E = 0;
  57   1      LCD_E = 0;
  58   1      LCD_E = 1; 
  59   1      }
  60          
  61          //读数据
  62          unsigned char ReadDataLCD(void)
  63          {
  64   1      LCD_RS = 1; 
  65   1      LCD_RW = 1;
  66   1      LCD_E = 0;
  67   1      LCD_E = 0;
  68   1      LCD_E = 1;
  69   1      return(LCD_Data);
  70   1      }
  71          
  72          //读状态
  73          unsigned char ReadStatusLCD(void)
  74          {
  75   1      LCD_Data = 0xFF; 
  76   1      LCD_RS = 0;
  77   1      LCD_RW = 1;
  78   1      LCD_E = 0;
  79   1      LCD_E = 0;
  80   1      LCD_E = 1;
  81   1      while (LCD_Data & Busy); //检测忙信号
  82   1      return(LCD_Data);
  83   1      }
  84          
  85          void LCDInit(void) //LCD初始化
  86          {
  87   1      LCD_Data = 0;
  88   1      WriteCommandLCD(0x38,0); //三次显示模式设置，不检测忙信号
  89   1      Delay5Ms(); 
  90   1      WriteCommandLCD(0x38,0);
  91   1      Delay5Ms(); 
  92   1      WriteCommandLCD(0x38,0);
  93   1      Delay5Ms(); 
  94   1      
  95   1      WriteCommandLCD(0x38,1); //显示模式设置,开始要求每次检测忙信号
  96   1      WriteCommandLCD(0x08,1); //关闭显示
  97   1      WriteCommandLCD(0x01,1); //显示清屏
  98   1      WriteCommandLCD(0x06,1); // 显示光标移动设置
  99   1      WriteCommandLCD(0x0C,1); // 显示开及光标设置
 100   1      }
 101          
 102          //按指定位置显示一个字符
 103          void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
 104          {
 105   1      Y &= 0x1;
 106   1      X &= 0xF;                       //限制X不能大于15，Y不能大于1
 107   1      if (Y)  X |= 0x40;      //当要显示第二行时地址码+0x40;
 108   1      X|= 0x80;                       //算出指令码
 109   1      WriteCommandLCD(X, 0); //这里不检测忙信号，发送地址码
 110   1      WriteDataLCD(DData);
 111   1      }
 112          
 113          //按指定位置显示一串字符
 114          void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
 115          {
 116   1      unsigned char ListLength;
 117   1      
C51 COMPILER V7.20   LCD_PARALLEL                                                          08/12/2007 17:35:12 PAGE 3   

 118   1      ListLength = 0;
 119   1      Y &= 0x1;
 120   1      X &= 0xF;                                               //限制X不能大于15，Y不能大于1
 121   1      while (DData[ListLength]>0x20)  //若到达字串尾则退出
 122   1              {
 123   2              if (X <= 0xF)                           //X坐标应小于0xF
 124   2                      {       
 125   3                      DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
 126   3                      ListLength++;
 127   3                      X++;
 128   3                      }
 129   2              }
 130   1      }
 131          
 132          //5ms延时
 133          void Delay5Ms(void)
 134          {
 135   1      unsigned int TempCyc = 5552;
 136   1      while(TempCyc--);
 137   1      }
 138          
 139          //400ms延时
 140          void Delay400Ms(void)
 141          {
 142   1      unsigned char TempCycA = 5;
 143   1      unsigned int TempCycB;
 144   1      while(TempCycA--)
 145   1              {
 146   2              TempCycB=7269;
 147   2              while(TempCycB--);
 148   2              }
 149   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    312    ----
   CONSTANT SIZE    =     29    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       8
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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