#include "reg51.h"
/********IO引腳定義***********************************************************/
#ifdef USE_PLCC44
	sbit LCD_RS=P2^7;//定義引腳
	sbit LCD_RW=P2^6;
	sbit LCD_E=P2^5;
	#define LCD_Data P1
#elif defined USE_DIP40
	sbit LCD_RS=P1^0;//定義引腳
	sbit LCD_RW=P1^1;
	sbit LCD_E=P1^2;
	#define LCD_Data P0
#else 
	sbit LCD_RS=P1^0;//定義引腳
	sbit LCD_RW=P1^1;
	sbit LCD_E=P1^2;
	#define LCD_Data P0
#endif
/********宏定義***********************************************************/
#define Busy    0x80 //用于檢測LCD狀態字中的Busy標識
#define uchar unsigned char
#define uint unsigned int

/********數據定義*************************************************************/
code uchar table[]={48,49,50,51,52,53,54,55,56,57};	 //0_9 ascii碼的數字

/********函數聲明*************************************************************/
void WriteDataLCD(unsigned char WR_DATA);					//寫數據
void WriteCommandLCD(unsigned char WCLCD);		//寫命令
void busy_check(void);						//讀狀態
void LCDInit(void);										//初始化
void DisplayOneChar(uchar X, uchar Y, uchar DData);			//相應坐標顯示字節內容
void DisplayListChar(uchar X, uchar Y, uchar code *DData);	//相應坐標開始顯示一串內容

/*初始化*/	
void LCDInit(void)
{
 	WriteCommandLCD(0x38); 	//顯示模式設置,開始要求每次檢測忙信號	 0011 1000
 	WriteCommandLCD(0x08); 	//關閉顯示
 	WriteCommandLCD(0x01); 	//顯示清屏
 	WriteCommandLCD(0x06); 	//顯示光標移動設置
 	WriteCommandLCD(0x0C); 	//顯示開及光標設置
}

/*按指定位置顯示一串字符*/	
void DisplayListChar(uchar X, uchar Y, uchar code *DData)
{
 	unsigned char ListLength;
 	ListLength = 0;
 	X &= 0xF;
	Y &= 0x1; 				//限制X不能大于15，Y不能大于1
 	while (DData[ListLength]>=0x20){ //若到達字串尾則退出
   		if (X <= 0xF){ 		//X坐標應小于0xF
     		DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
     		ListLength++;
     		X++;
    	}
  	}
}

/*按指定位置顯示一個字符*/	
void DisplayOneChar(uchar X, uchar Y, uchar DData)
{
	X &= 0xF; 
 	Y &= 0x1;				//限制X不能大于15，Y不能大于1
 	if (Y)
	 X |= 0x40; 		//當要顯示第二行時地址碼+0x40;
 	
	X |= 0x80; 			//算出指令碼
 	WriteCommandLCD(X); //發送地址碼
 	WriteDataLCD(DData);
}



/***********寫指令********************************************************/	
void WriteCommandLCD(uchar WCLCD)
{
 	busy_check();
 	LCD_Data = WCLCD;
 	LCD_RS = 0;
 	LCD_RW = 0; 
 	LCD_E = 0;
	LCD_E = 1; 
}

 /***********寫數據********************************************************/	
void WriteDataLCD(uchar WR_DATA)
{
	busy_check(); //檢測忙
 	LCD_Data = WR_DATA;
 	LCD_RS = 1;
 	LCD_RW = 0;
 //	LCD_E = 0; 		//若晶振速度太高可以在這后加小的延時
 	LCD_E = 0; 
 	LCD_E = 1;
}

//檢測忙信號
void busy_check(void)
{
 	LCD_Data = 0xFF; 
 	LCD_RS = 0;
 	LCD_RW = 1;
 	LCD_E = 0;
 	LCD_E = 1;
 	while (LCD_Data & Busy);
}