<code class="lang-cpp">/*-----------------------------------------------
  名称：LCD1602
  编写：shifang
  日期：2009.5
  修改：无
  内容：通过标准程序动态显示字符
  引脚定义如下：1-VSS 2-VDD 3-V0 4-RS 5-R/W 6-E 7-14 DB0-DB7 15-BLA 16-BLK
------------------------------------------------*/
#include<reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义
#include<intrins.h>
 
sbit RS = P2^4;   //定义端口 
sbit RW = P2^5;
sbit EN = P2^6;
 
#define RS_CLR RS=0 
#define RS_SET RS=1
 
#define RW_CLR RW=0 
#define RW_SET RW=1 
 
#define EN_CLR EN=0
#define EN_SET EN=1
 
#define DataPort P0
/*------------------------------------------------
 uS延时函数，含有输入参数 unsigned char t，无返回值
 unsigned char 是定义无符号字符变量，其值的范围是
 0~255 这里使用晶振12M，精确延时请使用汇编,大致延时
 长度如下 T=tx2+5 uS 
------------------------------------------------*/
void DelayUs2x(unsigned char t)
{   
 while(--t);
}
/*------------------------------------------------
 mS延时函数，含有输入参数 unsigned char t，无返回值
 unsigned char 是定义无符号字符变量，其值的范围是
 0~255 这里使用晶振12M，精确延时请使用汇编
------------------------------------------------*/
void DelayMs(unsigned char t)
{
      
 while(t--)
 {
     //大致延时1mS
     DelayUs2x(245);
     DelayUs2x(245);
 }
}
/*------------------------------------------------
              判忙函数
------------------------------------------------*/
 bit LCD_Check_Busy(void) 
 { 
 DataPort= 0xFF; 
 RS_CLR; 
 RW_SET; 
 EN_CLR; 
 _nop_(); 
 EN_SET;
 return (bit)(DataPort & 0x80);
 }
/*------------------------------------------------
              写入命令函数
------------------------------------------------*/
 void LCD_Write_Com(unsigned char com) 
 {  
// while(LCD_Check_Busy()); //忙则等待
 DelayMs(5);
 RS_CLR; 
 RW_CLR; 
 EN_SET; 
 DataPort= com; 
 _nop_(); 
 EN_CLR;
 }
/*------------------------------------------------
              写入数据函数
------------------------------------------------*/
 void LCD_Write_Data(unsigned char Data) 
 { 
 //while(LCD_Check_Busy()); //忙则等待
 DelayMs(5);
 RS_SET; 
 RW_CLR; 
 EN_SET; 
 DataPort= Data; 
 _nop_();
 EN_CLR;
 }
 
/*------------------------------------------------
                清屏函数
------------------------------------------------*/
 void LCD_Clear(void) 
 { 
 LCD_Write_Com(0x01); 
 DelayMs(5);
 }
/*------------------------------------------------
              写入字符串函数
------------------------------------------------*/
 void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s) 
 {     
 if (y == 0) 
    {     
     LCD_Write_Com(0x80 + x);     
    }
 else
    {     
    LCD_Write_Com(0xC0 + x);     
    }        
 while (*s) 
    {     
 LCD_Write_Data( *s);     
 s ++;     
    }
 }
/*------------------------------------------------
              写入字符函数
------------------------------------------------*/
 void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) 
 {     
 if (y == 0) 
    {     
    LCD_Write_Com(0x80 + x);     
    }    
 else
    {     
    LCD_Write_Com(0xC0 + x);     
    }        
 LCD_Write_Data( Data);  
 }
/*------------------------------------------------
              初始化函数
------------------------------------------------*/
 void LCD_Init(void) 
 {
   LCD_Write_Com(0x38);    /*显示模式设置*/
   DelayMs(5); 
   LCD_Write_Com(0x38); 
   DelayMs(5); 
   LCD_Write_Com(0x38); 
   DelayMs(5); 
   LCD_Write_Com(0x38);  
   LCD_Write_Com(0x08);    /*显示关闭*/
   LCD_Write_Com(0x01);    /*显示清屏*/
   LCD_Write_Com(0x06);    /*显示光标移动设置*/
   DelayMs(5); 
   LCD_Write_Com(0x0C);    /*显示开及光标设置*/
   }
    
/*------------------------------------------------
                    主函数
------------------------------------------------*/
void main(void) 
{ 
unsigned char i; 
unsigned char *p; 
 
LCD_Init(); 
 
while (1) 
 {  
 i = 1;  
 p = "www.doflye.net";  
 LCD_Clear();  
 LCD_Write_String(2,0,"Welcome to");  
 DelayMs(250);   
 while (*p) 
    {   
    LCD_Write_Char(i,1,*p);   
    i ++;   
    p ++;   
    DelayMs(250);   
    }  
  DelayMs(250);  
 }
}</intrins.h></reg52.h></code>