#ifndef LCD1602_2009_3
#define LCD1602_2009_3

#include  <reg52.h> 
#include <intrins.h>

#define uchar  unsigned char
#define uint  unsigned int 

sbit  LCD_RS = P2 ^ 0; 
sbit  LCD_RW = P2 ^ 1;   
sbit  LCD_E  = P2 ^ 2;

#define  LCD_DATA   P0 

uchar code LcdBuf[]= {								 //自定義漢字	5X7;最大能存儲64個字節
								
						0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00,
						0x0f,0x10,0x10,0x10,0x10,0x10,0x0f,0x00,
						
				   	  };

 void delayms(uchar ms)	    	// 延時子程序
{						
    uchar i;
	while(ms--)
	{
		for(i = 0; i < 120; i++);
	}
}

bit lcd_busy()
	{                          // 測試LCD忙碌狀態
	bit result;
	LCD_RS = 0;
	LCD_RW = 1;
	LCD_E = 1;
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	result =(LCD_DATA  & 0x80);
	LCD_E = 0;
	return result; 
	}

void  WriteCommand(uchar wdata)
{
   while(lcd_busy());
   LCD_DATA=wdata;
   LCD_RS=0;
   LCD_RW=0;
   LCD_E=1;
   LCD_E=0;
   delayms(5);    
   LCD_E=1;
}

void  WriteData(uchar wdata)
{
   while(lcd_busy());
   LCD_DATA=wdata;
   LCD_RS=1;
   LCD_RW=0;
   LCD_E=1;
   LCD_E=0;
   delayms(5);    
   LCD_E=1;
}

void  lcd_init(void)
{
    WriteCommand(0x38);
	WriteCommand(0x38); 
	WriteCommand(0x38); 
    delayms(5); 
    WriteCommand(0x08); 
    WriteCommand(0x01); 
    WriteCommand(0x06); 
    WriteCommand(0x0c); 
}

void  set_xy(uchar x,uchar y)
{ 
  switch (x)
   {
   	 case 0: y+=0x80; break;
	 case 1: y+=0xc0; break;
	 case 2: y+=0x90; break;
	 case 3: y+=0xd0; break;
   }  
  WriteCommand(y);
}


void  display_onechar(uchar x,uchar y,uchar wdate)
{
 set_xy(x,y);
 WriteData(wdate);
}



void  display_string(uchar x,uchar y,uchar *s)
{
  set_xy(x,y);
  while(*s)
  {
   WriteData(*s);
   s++;
  }
}

void Write_CGRAM(uchar *p)
{
uchar i,j,kk;
uchar tmp=0x40;  //操作CGRAM的命令碼
kk=0;
for(j=0;j<2;j++)        //64 字節存儲空間,可以生成 8 個自定義字符點陣 64X8
{
    for(i=0;i<8;i++)    // 8 個字節生成 1 個字符點陣
    {
        WriteCommand(tmp+i);    //操作CGRAM的命令碼+寫入CGRAM地址.
        WriteData(p[kk]);    //寫入數據
        kk++;
    }
    tmp += 8; 
}
}  
 

#endif