/**************************************************************************
  
                   		THE 1602 CHAR LCD LIB
  
             		COPYRIGHT (c)   2005 BY JJJ.
                       		--  ALL RIGHTS RESERVED  --
  
   File Name:       LCD.h
   Author:          Jiang Jian Jun
   Created:         2005/4/3
   Modified:		NO
   Revision: 		1.0
  
***************************************************************************/

#ifndef LCD_CHAR_1602_2005_4_9
#define LCD_CHAR_1602_2005_4_9

#define	uint32	unsigned long

//Port Definitions**********************************************************
#define rs (1<<8)           //P0.8 <---> RS
#define rw (1<<9)           //P0.9 <---> RW
#define en (1<<10)          //P0.10 <---> En
#define busy (1<<7)		

// Waite function
void Delay(void)
{
	uint32 i=0x01;
	while(--i){;}
	// i=0xff;
	// while(i--){;}
}

//內部等待函數**************************************************************************
void LCD_Wait(void)
{
	IODIR=0x700;                    // set P0.0...P0.7 as input pins
	while(1)
	{
		IOCLR=rs;		Delay();
		IOSET=rw;		Delay();
		IOCLR=0x00ff;   Delay();    //liwx added this line
		IOSET=en;		Delay();
		if(!(IOPIN & busy)) break;
		IOCLR=en;		Delay();
	}
	IOCLR=en;			Delay();
	IODIR=0x7ff;	    Delay();    // set P0.0...P0.7 as output
}

//向LCD寫入命令或數據************************************************************
// the "style" parameter values are followed
#define LCD_DATA			1      // Data
#define LCD_COMMAND			0      // Command
#define LCD_CLEAR_SCREEN	0x01      // 清屏
#define LCD_HOMING  		0x02      // 光標返回原點
void LCD_Write(unsigned char style, unsigned char input)
{
	LCD_Wait();						// check if LCD is busy
	
	if (style==LCD_DATA)
	{
		IOSET=rs; Delay(); 
	} else {
        IOCLR=rs; Delay(); 			//全部清零
	}
        
	IOCLR=rw;		Delay(); 
	IOCLR=0xff;		Delay(); 		//先清零
	IOSET=input;	Delay(); 		//再送數
	IOSET=en;		Delay(); 
	IOCLR=en;		Delay(); 
}

//設置顯示模式************************************************************
#define LCD_SHOW			0x04    //顯示開
#define LCD_HIDE			0x00    //顯示關	  

#define LCD_CURSOR			0x02 	//顯示光標
#define LCD_NO_CURSOR		0x00    //無光標		     

#define LCD_FLASH			0x01    //光標閃動
#define LCD_NO_FLASH		0x00    //光標不閃動

void LCD_SetDisplay(unsigned char DisplayMode)
{
	LCD_Write(LCD_COMMAND, 0x08|DisplayMode);	
}

//設置輸入模式************************************************************
#define LCD_AC_UP			0x02
#define LCD_AC_DOWN			0x00      // default

#define LCD_MOVE			0x01      // 畫面可平移
#define LCD_NO_MOVE			0x00      //default

void LCD_SetInput(unsigned char InputMode)
{
	LCD_Write(LCD_COMMAND, 0x04|InputMode);
}

//移動光標或屏幕************************************************************
/*
#define LCD_CURSOR		0x02      
#define LCD_SCREEN		0x08
#define LCD_LEFT		0x00
#define LCD_RIGHT		0x04
void LCD_Move(unsigned char object, unsigned char direction)
{
	if(object==LCD_CURSOR)
		LCD_Write(LCD_COMMAND,0x10|direction);
	if(object==LCD_SCREEN)
		LCD_Write(LCD_COMMAND,0x18|direction);
}
*/

//初始化LCD************************************************************
void LCD_Initial()
{
	IOCLR=en;
	
	LCD_Write(LCD_COMMAND,0x38);           //8位數據端口,2行顯示,5*7點陣
	LCD_Write(LCD_COMMAND,0x38);
	LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR);    //開啟顯示, 無光標
	LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN);   //清屏
	LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE);       //AC遞增, 畫面不動
}

//************************************************************************

void GotoXY(unsigned char x, unsigned char y)
{
	if(y==0)
		LCD_Write(LCD_COMMAND,0x80|x);
	if(y==1)
		LCD_Write(LCD_COMMAND,0x80|(x-0x40));
}

void Print(unsigned char *str)
{
	while(*str!='\0')
	{
		LCD_Write(LCD_DATA,*str);
		str++;
	}
}

/*
void LCD_LoadChar(unsigned char user[8], unsigned char place)
{
	unsigned char i;
	LCD_Write(LCD_COMMAND,0x40|(place*8));
	for(i=0; i<8; i++)
		LCD_Write(LCD_DATA,user[i]);
}
*/

//************************************************************************
#endif