lcm1602.lst

麦迪工作室51开发板LCM1602液晶屏驱动代码。可点亮1602液晶屏。

C51 COMPILER V7.00  LCM1602                                                                12/02/2008 21:39:54 PAGE 1   


C51 COMPILER V7.00, COMPILATION OF MODULE LCM1602
OBJECT MODULE PLACED IN lcm1602.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE lcm1602.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include "atmel89x51.h"
   2          #include <string.h>
   3          #define LCM_RW P3_3 //定义引脚
   4          #define LCM_RS P3_2
   5          #define LCM_E P3_5
   6          #define LCM_Data P0     
   7          #define Busy 0x80 //用于检测LCM状态字中的Busy标识
   8          void WriteDataLCM(unsigned char WDLCM);         //写数据函数 
   9          void WriteCommandLCM(unsigned char WCLCM,BuysC);//写指令函数
  10          unsigned char ReadDataLCM(void);        //读数据
  11          unsigned char ReadStatusLCM(void);//读状态
  12          void LCMInit(void); //LCM初始化
  13          void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);//按指定位置显示一个字符
  14          void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
  15          void Delay5Ms(void);
  16          void Delay400Ms(void);
  17          unsigned char code McuDsp_com[] = {"www.McuDsp.com"};
  18          unsigned char code email[] = {"MD test"};
  19          void main(void)
  20          {
  21   1      Delay400Ms(); //启动等待，等LCM讲入工作状态
  22   1      LCMInit(); //LCM初始化
  23   1      Delay5Ms(); //延时片刻(可不要)
  24   1      
  25   1      DisplayListChar(1, 0, McuDsp_com);
  26   1      DisplayListChar(4, 1, email);
  27   1      ReadDataLCM();//测试用句无意义
  28   1      while(1);
  29   1      }
  30          
  31          //写数据
  32          void WriteDataLCM(unsigned char WDLCM)
  33          {
  34   1      ReadStatusLCM(); //检测忙
  35   1      LCM_Data = WDLCM;
  36   1      LCM_RS = 1;
  37   1      LCM_RW = 0;
  38   1      LCM_E = 0; //若晶振速度太高可以在这后加小的延时
  39   1      LCM_E = 0; //延时
  40   1      LCM_E = 1;
  41   1      }
  42          
  43          //写指令
  44          void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
  45          {
  46   1      if (BuysC) ReadStatusLCM(); //根据需要检测忙
  47   1      LCM_Data = WCLCM;
  48   1      LCM_RS = 0;
  49   1      LCM_RW = 0; 
  50   1      LCM_E = 0;
  51   1      LCM_E = 0;
  52   1      LCM_E = 1; 
  53   1      }
  54          
  55          //读数据
C51 COMPILER V7.00  LCM1602                                                                12/02/2008 21:39:54 PAGE 2   

  56          unsigned char ReadDataLCM(void)
  57          {
  58   1      LCM_RS = 1; 
  59   1      LCM_RW = 1;
  60   1      LCM_E = 0;
  61   1      LCM_E = 0;
  62   1      LCM_E = 1;
  63   1      return(LCM_Data);
  64   1      }
  65          
  66          //读状态
  67          unsigned char ReadStatusLCM(void)
  68          {
  69   1      LCM_Data = 0xFF; 
  70   1      LCM_RS = 0;
  71   1      LCM_RW = 1;
  72   1      LCM_E = 0;
  73   1      LCM_E = 0;
  74   1      LCM_E = 1;
  75   1      while (LCM_Data & Busy); //检测忙信号
  76   1      return(LCM_Data);
  77   1      }
  78          
  79          void LCMInit(void) //LCM初始化
  80          {
  81   1      LCM_Data = 0;
  82   1      WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
  83   1      Delay5Ms(); 
  84   1      WriteCommandLCM(0x38,0);
  85   1      Delay5Ms(); 
  86   1      WriteCommandLCM(0x38,0);
  87   1      Delay5Ms(); 
  88   1      
  89   1      WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
  90   1      WriteCommandLCM(0x08,1); //关闭显示
  91   1      WriteCommandLCM(0x01,1); //显示清屏
  92   1      WriteCommandLCM(0x06,1); // 显示光标移动设置
  93   1      WriteCommandLCM(0x0C,1); // 显示开及光标设置
  94   1      }
  95          
  96          //按指定位置显示一个字符
  97          void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
  98          {
  99   1      Y &= 0x1;
 100   1      X &= 0xF; //限制X不能大于15，Y不能大于1
 101   1      if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
 102   1      X |= 0x80; //算出指令码
 103   1      WriteCommandLCM(X, 0); //这里不检测忙信号，发送地址码
 104   1      WriteDataLCM(DData);
 105   1      }
 106          
 107          void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *PlayData)
 108          {
 109   1        unsigned char ListLength,j;
 110   1        ListLength = strlen(PlayData);
 111   1        Y &= 0x1;
 112   1        X &= 0xF; //限制X不能大于15，Y不能大于1
 113   1            if (X <= 0xF) //X坐标应小于0xF
 114   1              { 
 115   2                          for(j=0;j<ListLength;j++)
 116   2                            {
 117   3                   DisplayOneChar(X, Y, PlayData[j]); //显示单个字符
C51 COMPILER V7.00  LCM1602                                                                12/02/2008 21:39:54 PAGE 3   

 118   3                   X++;
 119   3                  }
 120   2              }
 121   1      }
 122          
 123          //5ms延时
 124          void Delay5Ms(void)
 125          {
 126   1      unsigned int TempCyc = 5552;
 127   1      while(TempCyc--);
 128   1      }
 129          
 130          //400ms延时
 131          void Delay400Ms(void)
 132          {
 133   1      unsigned char TempCycA = 5;
 134   1      unsigned int TempCycB;
 135   1      while(TempCycA--)
 136   1      {
 137   2      TempCycB=7269;
 138   2      while(TempCycB--);
 139   2      };
 140   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    324    ----
   CONSTANT SIZE    =     23    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       9
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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