LCD 1602采用8线并口通信,连接方式是DB0－DB7接P1.0-P1.7;RS:P2.7;RW:P2.6
EN:P2.5;注意初始化的设置。
在万利MedWin 3.0开发环境上调试通过！
/*******************************************************************                                                                            
/* 模块功能： 显示内容：   SME OF DUT                                                   
/*                         Fenyman                                                                                                                                                                                                  
creat by:    fenyman
Date:    2006-06-21
Corporation: SME of Dalian University of Technology
Version V1.1
Copyright(C)feyman  2006-2016
All rigths reserved                                              
/*******************************************************************/   
#include <reg51.h>

#define  LCDIO        P1
sbit LCD1602_RS=P2^7; 
sbit LCD1602_RW=P2^6;  
sbit LCD1602_EN=P2^5;  

/********************************************************************/
void LCD_delay(void);
void LCD_en_command(unsigned char command);
void LCD_en_dat(unsigned char temp);
void LCD_set_xy( unsigned char x, unsigned char y );
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_init(void);
/********************************************************************/
void delay_nms(unsigned int n);

/********************************************************************/
void main(void)
{
  LCD_init();
  while(TRUE )   
  {
     CLEARSCREEN;
    delay_nms(2);
        LCD_write_string(0,0,"   SME OF DUT  ");
        LCD_write_string(0,1,"   fenyman     ");
       
        delay_nms(200);
        
        CLEARSCREEN;
        delay_nms(2);
        LCD_write_string(0,0,"   thank you!   ");
        LCD_write_string(0,1,"   fenyman      ");
        
        delay_nms(200);                 
  }
}
/********************************************************************/
/******************** LCD PART *************************************/
void LCD_delay(void)  
{
  unsigned char i;
  for(i=40;i>0;i--)
    ;
}
/********************************************************************/ 
void LCD_en_command(unsigned char command)
{
  LCDIO=command;
  LCD1602_RS=0;  
  LCD1602_RW=0;
  LCD1602_EN=0;
  LCD_delay();
 
  LCD1602_EN=1;
}
/********************************************************************/
void LCD_en_dat(unsigned char dat)
{
  LCD1602_RS=1;
  LCD1602_RW=0;
  LCD1602_EN=0;
  LCD_delay();
  LCDIO=dat;
  LCD1602_EN=1;
}
/********************************************************************/
void LCD_set_xy( unsigned char x, unsigned char y )
{
  unsigned char address;
  if (y == 0)
   address = 0x80 + x;
  else
      address = 0xC0 + x;
  LCD_en_command(address);
}
/********************************************************************/
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
  LCD_set_xy( x, y );
  LCD_en_dat(dat);
}
/********************************************************************/
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
    LCD_set_xy( X, Y );    
    while (*s)       
    {
      LCDIO=*s;
      LCD_en_dat(*s);  
   s ++;
    }
}
/********************************************************************/
void LCD_init(void)
{
  LCD_en_command(0x01);
  delay_nms(5);
  LCD_en_command(0x38);
  delay_nms(5);
  LCD_en_command(0x38);
  delay_nms(5);
  LCD_en_command(0x38);
  delay_nms(5);
  LCD_en_command(0xC0);
  delay_nms(5);
  LCD_en_command(0x80);
  delay_nms(5);
  LCD_en_command(0x01);
  delay_nms(5);       
}
/********************************************************************/
void delay_nms(unsigned int n)     
{
    unsigned int i=0,j=0;
    for (i=n;i>0;i--)
     for (j=0;j<1140;j++); 
}
/********************************************************************/