#include <REG52.H>

#ifndef	uchar
#define uint unsigned int
#define uchar unsigned char
#endif

#define 	LCD_DATA 	P0

sbit RS=P2^7;
sbit RW=P2^6;
sbit EN=P2^5;
sbit RST=P2^4;
void delay_us(unsigned char us);
void delay_ms(unsigned int ms);

void LCD_Busy_Check()                  //等待LCD空閑
{
	LCD_DATA &=~0x80;
	EN=0;
	RS=0;
  	RW=1;                 //RW=1
	EN=1; 
  	while (!(LCD_DATA&0x80)==0);
	EN=0;
	LCD_DATA |= 0xff;
}

void LCD_write(uchar wdat,uchar mode)
{

	LCD_Busy_Check();
	LCD_DATA |= 0xff;
	EN=0; 	 //EN=0
	RS=mode;  //RS=1    
   RW=0;     //RW=0
	EN=1;
	LCD_DATA &= wdat;   //send 8bit 
	EN=0;
	RW=1;
	RS=1;
}

void LCD_set_position( uchar x, uchar y )
{
    uchar address;
	switch(y)
	{
		case 0: 
		   address = 0x80 + x;
		    break; 
	    case 1: 
		    address = 0x90 + x;
			break; 
		case 2: 
			address = 0x88 + x;
			break; 
	    case 3: 
			address = 0x98 + x;
			break; 
		default:address = 0x80 + x;
	}
    LCD_write( address, 0 );
}

void LCD_write_string(uchar X,uchar Y,uchar *s)
{
	LCD_set_position( X, Y );
    while (*s) 
    {
    	LCD_write(*s,1);
	   s++;
	}
}
  

void LCD_set_pic_position(unsigned char x,unsigned char y)
{
	if(y>31) 
	{
		x+=0x88;
		y=(y-32)+0x80;
	}
	else
	{
		x+=0x80;
		y+=0x80;
	}
	LCD_write(0x34,0);
	LCD_write(y,0);
	LCD_write(x,0);
	LCD_write(0x30,0);
}


void LCD_Convert(unsigned char x,unsigned char y,unsigned char weith,unsigned char mode)		//反白
{
	unsigned char flag=0;
	unsigned char px=0;
	unsigned char py=0;	
	if (mode) mode=0xff;
	if(x%2) 
	{
		flag=1;
	}
	x/=2;
	for(py=0;py<16;py++)
	{
		LCD_set_pic_position(x,y*16+py);
		if(flag) LCD_write(0,1);
		for (px=weith;px>0;px--)
		{
			LCD_write (mode,1);
		}
	}
	LCD_write(0x36,0);
	LCD_write(0x30,0);
}

void LCD_clr_pic()
{
	unsigned char i;
	for(i=0;i<4;i++) LCD_Convert(0,i,16,0);
}


void LCD_init(void)
{
	RST=0;
	delay_us(50);
	RST=1;
	delay_us(50);
    LCD_write(0x01,0);      //顯示清屏
	delay_ms(30);
  	 LCD_write(0x0c,0);      //顯示開,不顯示光標
	delay_ms(30);
    LCD_write(0x80,0);      //顯示光標移動設置
	delay_ms(30);
	LCD_clr_pic();
}