/*-----------------------------------------------
  名稱：LCD1602
  論壇：www.doflye.net
  編寫：shifang
  日期：2009.5
  修改：無
  內(nèi)容：通過標(biāo)準(zhǔn)程序動(dòng)態(tài)顯示字符
  引腳定義如下：1-VSS 2-VDD 3-V0 4-RS 5-R/W 6-E 7-14 DB0-DB7 15-BLA 16-BLK
------------------------------------------------*/
#include<reg52.h> //包含頭文件，一般情況不需要改動(dòng)，頭文件包含特殊功能寄存器的定義
#include<intrins.h>

sbit RS = P2^4;   //定義端口 
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延時(shí)函數(shù)，含有輸入?yún)?shù) unsigned char t，無返回值
 unsigned char 是定義無符號(hào)字符變量，其值的范圍是
 0~255 這里使用晶振12M，精確延時(shí)請(qǐng)使用匯編,大致延時(shí)
 長(zhǎng)度如下 T=tx2+5 uS 
------------------------------------------------*/
void DelayUs2x(unsigned char t)
{   
 while(--t);
}
/*------------------------------------------------
 mS延時(shí)函數(shù)，含有輸入?yún)?shù) unsigned char t，無返回值
 unsigned char 是定義無符號(hào)字符變量，其值的范圍是
 0~255 這里使用晶振12M，精確延時(shí)請(qǐng)使用匯編
------------------------------------------------*/
void DelayMs(unsigned char t)
{
     
 while(t--)
 {
     //大致延時(shí)1mS
     DelayUs2x(245);
	 DelayUs2x(245);
 }
}
/*------------------------------------------------
              判忙函數(shù)
------------------------------------------------*/
 bit LCD_Check_Busy(void) 
 { 
 DataPort= 0xFF; 
 RS_CLR; 
 RW_SET; 
 EN_CLR; 
 _nop_(); 
 EN_SET;
 return (bit)(DataPort & 0x80);
 }
/*------------------------------------------------
              寫入命令函數(shù)
------------------------------------------------*/
 void LCD_Write_Com(unsigned char com) 
 {  
 while(LCD_Check_Busy()); //忙則等待
 RS_CLR; 
 RW_CLR; 
 EN_SET; 
 DataPort= com; 
 _nop_(); 
 EN_CLR;
 }
/*------------------------------------------------
              寫入數(shù)據(jù)函數(shù)
------------------------------------------------*/
 void LCD_Write_Data(unsigned char Data) 
 { 
 while(LCD_Check_Busy()); //忙則等待
 RS_SET; 
 RW_CLR; 
 EN_SET; 
 DataPort= Data; 
 _nop_();
 EN_CLR;
 }

/*------------------------------------------------
                清屏函數(shù)
------------------------------------------------*/
 void LCD_Clear(void) 
 { 
 LCD_Write_Com(0x01); 
 DelayMs(5);
 }
/*------------------------------------------------
              寫入字符串函數(shù)
------------------------------------------------*/
 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 ++;     
 	}
 }
/*------------------------------------------------
              寫入字符函數(shù)
------------------------------------------------*/
 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);  
 }
/*------------------------------------------------
              初始化函數(shù)
------------------------------------------------*/
 void LCD_Init(void) 
 {
   LCD_Write_Com(0x38);    /*顯示模式設(shè)置*/ 
   DelayMs(5); 
   LCD_Write_Com(0x38); 
   DelayMs(5); 
   LCD_Write_Com(0x38); 
   DelayMs(5); 
   LCD_Write_Com(0x38);  
   LCD_Write_Com(0x08);    /*顯示關(guān)閉*/ 
   LCD_Write_Com(0x01);    /*顯示清屏*/ 
   LCD_Write_Com(0x06);    /*顯示光標(biāo)移動(dòng)設(shè)置*/ 
   DelayMs(5); 
   LCD_Write_Com(0x0C);    /*顯示開及光標(biāo)設(shè)置*/
   }
   
/*------------------------------------------------
                    主函數(shù)
------------------------------------------------*/ 
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);  
 }
}