LCD.rar

				/*============================================================
				        使用1602液晶显示的实验例子     明浩  2004/2/27
				==============================================================
				SMC1602A(16*2)模拟口线接线方式
				连接线图: 
				       ---------------------------------------------------
				       |LCM-----51   | LCM-----51   | LCM------51      |
				       --------------------------------------------------|
				       |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0    |
				       |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1    |
				       |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2    |
				       |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
				       ---------------------------------------------------
				
				
				
				[注:AT89S51使用12M晶振]
				=============================================================*/
				
				#define LCM_RW  P2_0 //定义引脚
				#define LCM_RS  P2_1
				#define LCM_E   P2_2
				#define LCM_Data  P1
				#define Busy    0x80 //用于检测LCM状态字中的Busy标识
				
				#include 
				
				void WriteDataLCM(unsigned char WDLCM);
				void WriteCommandLCM(unsigned char WCLCM,BuysC);
				unsigned char ReadDataLCM(void);
				unsigned char ReadStatusLCM(void);
				void LCMInit(void);
				void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
				void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
				void Delay5Ms(void);
				void Delay400Ms(void);
				
				unsigned char code cdle_net[] = {"www.cdle.net"};
				unsigned char code email[] = {"pnzwzw@cdle.net"};
				
				void main(void)
				{
				 Delay400Ms(); //启动等待，等LCM讲入工作状态
				 LCMInit(); //LCM初始化
				 Delay5Ms(); //延时片刻(可不要)
				
				 DisplayListChar(0, 0, cdle_net);
				 DisplayListChar(0, 1, email);
				 ReadDataLCM();//测试用句无意义
				 while(1);
				}
				
				//写数据
				void WriteDataLCM(unsigned char WDLCM)
				{
				 ReadStatusLCM(); //检测忙
				 LCM_Data = WDLCM;
				 LCM_RS = 1;
				 LCM_RW = 0;
				 LCM_E = 0; //若晶振速度太高可以在这后加小的延时
				 LCM_E = 0; //延时
				 LCM_E = 1;
				}
				
				//写指令
				void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
				{
				 if (BuysC) ReadStatusLCM(); //根据需要检测忙
				 LCM_Data = WCLCM;
				 LCM_RS = 0;
				 LCM_RW = 0; 
				 LCM_E = 0;
				 LCM_E = 0;
				 LCM_E = 1; 
				}
				
				//读数据
				unsigned char ReadDataLCM(void)
				{
				 LCM_RS = 1; 
				 LCM_RW = 1;
				 LCM_E = 0;
				 LCM_E = 0;
				 LCM_E = 1;
				 return(LCM_Data);
				}
				
				//读状态
				unsigned char ReadStatusLCM(void)
				{
				 LCM_Data = 0xFF; 
				 LCM_RS = 0;
				 LCM_RW = 1;
				 LCM_E = 0;
				 LCM_E = 0;
				 LCM_E = 1;
				 while (LCM_Data & Busy); //检测忙信号
				 return(LCM_Data);
				}
				
				void LCMInit(void) //LCM初始化
				{
				 LCM_Data = 0;
				 WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
				 Delay5Ms(); 
				 WriteCommandLCM(0x38,0);
				 Delay5Ms(); 
				 WriteCommandLCM(0x38,0);
				 Delay5Ms(); 
				
				 WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
				 WriteCommandLCM(0x08,1); //关闭显示
				 WriteCommandLCM(0x01,1); //显示清屏
				 WriteCommandLCM(0x06,1); // 显示光标移动设置
				 WriteCommandLCM(0x0C,1); // 显示开及光标设置
				}
				
				//按指定位置显示一个字符
				void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
				{
				 Y &= 0x1;
				 X &= 0xF; //限制X不能大于15，Y不能大于1
				 if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
				 X |= 0x80; //算出指令码
				 WriteCommandLCM(X, 0); //这里不检测忙信号，发送地址码
				 WriteDataLCM(DData);
				}
				
				//按指定位置显示一串字符
				void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
				{
				 unsigned char ListLength;
				
				  ListLength = 0;
				 Y &= 0x1;
				 X &= 0xF; //限制X不能大于15，Y不能大于1
				 while (DData[ListLength]>0x20) //若到达字串尾则退出
				  {
				   if (X 				    {
				     DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
				     ListLength++;
				     X++;
				    }
				  }
				}
				
				//5ms延时
				void Delay5Ms(void)
				{
				 unsigned int TempCyc = 5552;
				 while(TempCyc--);
				}
				
				//400ms延时
				void Delay400Ms(void)
				{
				 unsigned char TempCycA = 5;
				 unsigned int TempCycB;
				 while(TempCycA--)
				 {
				  TempCycB=7269;
				  while(TempCycB--);
				 };
				}