LCD1602液晶屏幕显示介绍

先贴上程序，后面再分析。

#include
#include

#define uchar unsigned char
#define uint unsigned int

uchar code line1[] = {"welcome!"};

uchar p[]=          //自定义字模数组
{
0x00,0x0f,0x04,0x0f,0x05,0x07,0x00,0x00,
0x0f,0x12,0x1f,0x15,0x1f,0x15,0x1f,0x15,    //确
0x04,0x02,0x0e,0x02,0x02,0x03,0x02,0x00,
0x04,0x04,0x04,0x04,0x04,0x0a,0x11,0x00,    //认
0x00,0x0f,0x09,0x06,0x06,0x06,0x09,0x00,
0x1f,0x0a,0x0e,0x0e,0x0a,0x1f,0x02,0x02     //取
};

sbit E=P2^7;
sbit RW=P2^5;
sbit RS=P2^6;

busying ()                                                             
{                                                                          
 bit result;                                                            
 RS = 0;                                                           
 RW = 1;                                                            
 E = 1;                                                            
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 result = (bit)(P0&0x80);                                              
 E = 0;                                                            
 return result;                                                         
}

writeorder (uchar cmd)
{
 while (busying());
 RS = 0;                                                            
 RW = 0;                                                            
 E = 0;                                                            
 _nop_();                                                               
 _nop_();                                                               
 P0 = cmd;                                                              
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 E = 1;                                                            
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 E = 0;
}

writedata (uchar dat)
{
 while (busying());
 RS = 1;                                                            
 RW = 0;                                                            
 E = 0;                                                            
 _nop_();                                                               
 _nop_();                                                               
 P0 = dat;                                                              
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 E = 1;                                                            
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 _nop_();                                                               
 E = 0;
}

delay(uchar i)                                                         
{                                                                          
 while(i--)                                                             
 {
  uchar j=250;                                                                       
  while(j--)                                              
  {                                                                     
   _nop_();                                                             
   _nop_();                                                             
   _nop_();                                                             
   _nop_();                                                             
  }                                                                     
 }                                                                       
}

initial ()
{
 delay (150);    
 writeorder (0x38);  //工作方式：8位、2行、5x7
 delay(5);
 writeorder (0x06);     //输入方式：光标右移、屏幕不动 
 delay(5);
 writeorder (0x0c);  //显示状态：显示开、有光标、不闪烁
 delay(5);
 writeorder (0x01);  //清屏
 delay(5);
}

newbyte (void)    //设置自定义字符
{
  uchar i,j,k=0;
  uchar temp=0x40; 
  for(j=0;j<6;j++)        
  {    
    for(i=0;i<8;i++)      
    {        
   writeorder(temp+i);    
      writedata(p[k]);        
      k++;    
 }   
    temp += 8;
  }
}

main (void)
{
 uchar i=0;
 initial ();
 newbyte ();
 writeorder (0x85);   //设置第一行显示位置
 writedata (0x00);
 writedata (0x01);
 writedata (0x02);
 writedata (0x03);
 writedata (0x04);
 writedata (0x05);

 writeorder (0xc4);   //设置第二行显示位置
 while(line1[i] != '\0')
 {                                    // 显示字符"welcome!"
   writedata(line1[i]);
   i++;
 }
 while (1);
}

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下载：LCD1602汉字显示讲解.doc

程序中函数名定义的都很清楚了，不清楚的后面都有注释，补充两点：

1、数组uchar p[]和函数newbyte ()是为了自定义汉字的，可以删除掉。

2、1602共有两行，第一行显示从0x80开始，第二行从0xc0开始

举例说明，想在第一行第二个光标处显示，地址就是：0x81；想在第二行第三个光标处显示，地址就是：0xc2.