//█使用舉例(僅供參考)  
#include <reg51.h>     
//#include <intrins.h>
//#define lcdbus P3
sbit dc=P1^3; //*P1.3 LCD 的RS 21*/
sbit rw=P1^4; //*P1.4 LCD 的R/W 22*/
sbit cs=P1^5; //*P1.5 LCD 的E 25*/
sfr lcdbus=0xB0; /*p3 LCD 數據D0=P3.0*/
sfr ZW=0xA0; //P2 LCD /
sfr ZX=0x80; //P0 LCD /
unsigned int sys10mscounter;
unsigned char syslimitcounter;
char path1[8]={0x00,0x1f,0x00,0x1f,0x00,0x1f,0x00,0x1f};/*自定義符號：橫1*/
char path2[8]={0x1f,0x00,0x1f,0x00,0x1f,0x00,0x1f,0x00};/*自定義符號：橫2*/
char pats1[8]={0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15};/*自定義符號：豎1*/
char pats2[8]={0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a,0x0a};/*自定義符號：豎2*/
void soft_nop(){}
void soft_10ms()/***********12MHZ 提供10MS 軟件延時************/
{ 	register unsigned int i;
	//for(i=0;i<711;i++); // 12M
	for(i=0;i<1422;i++);  // 24M
}
void soft_20ms()/***********12MHZ 提供20MS 軟件延時************/
{ 	soft_10ms();
	soft_10ms();
}

void delayLCD()
{ int i;
  i=3000;
  while(i--) soft_10ms();
}
void hard_10ms(unsigned int delaytime) /*基于10MS 的硬件延時*/
{ 	sys10mscounter=delaytime;
	//while(sys10mscounter);
	while(sys10mscounter--) soft_10ms();
}
unsigned char data lcdcounter;
bit lcdusing1,lcdusing2;
bit lcd_checkbusy()/*檢查LCD 忙*/
{ 	register lcdstate;
	dc=0; /*dc=1為數據,=0為命令.*/
	rw=1; /*rw=1為讀,=0為寫.*/
	cs=1; /*cs=1選通.*/
	soft_nop();
	//lcdbus = 0xff;
	lcdstate=lcdbus;
	cs=0;
	return((bit)(lcdstate&0x80));
}
void lcd_wrcmd(unsigned char lcdcmd) /*寫LCD 命令*/
{ 	lcdusing1=1;
	while(lcd_checkbusy());
	lcdbus=lcdcmd;
	dc=0; /*dc=1為數據,=0為命令.*/
	rw=0; /*rw=1為讀,=0為寫.*/
	cs=1; /*cs=1選通.*/
	soft_nop();
	cs=0;
	lcdbus=0xff;
	lcdusing1=0;
}
void lcd_moveto(char position) /*移動光標到指定位.0-79*/
{ 	register cmd=0x80;
	lcdcounter=position;
	if (position > 59)
		position += 0x18;
	else
	{ 	if (position > 39)position -= 0x14;
		else
		{ if (position > 19)position += 0x2c;
		}
	}
	cmd=cmd|position;
	lcd_wrcmd(cmd);
}
void lcd_wrdata(char lcddata) /*在當前顯示位置顯示數據*/
{ 	//char i;
	lcdusing2=1;
	while(lcd_checkbusy());
	if(lcdcounter==20){
		lcd_moveto(20);
		while(lcd_checkbusy());
	}
	if(lcdcounter==40){
	lcd_moveto(40);
	while(lcd_checkbusy());
	}
	if(lcdcounter==60){
		lcd_moveto(60);
		while(lcd_checkbusy());
	}
	if(lcdcounter==80){
		lcd_moveto(0);
		while(lcd_checkbusy());
		lcdcounter=0;
	} /*為通用而如此*/
	lcdcounter++;
	lcdbus=lcddata;
	dc=1; /*dc=1為數據,=0為命令.*/
	rw=0; /*rw=1為讀,=0為寫.*/
	cs=1; /*cs=1選通.*/
	soft_nop();
	cs=0;
	lcdbus=0xff;
	lcdusing2=0;
}

void lcd_string(char *strpoint) /*在當前顯示位置顯示LCD 字符串*/
{ 	register i=0;
	while(strpoint[i]!=0){
		lcd_wrdata(strpoint[i]);
		i++;
	}
}
void lcd_init()/*初始化*/
{ 	lcd_wrcmd(0x38); /*設置8 位格式,2 行,5*7*/
	lcd_wrcmd(0x0c); /*整體顯示,關光標,不閃爍*/
	lcd_wrcmd(0x06); /*設定輸入方式,增量不移位*/
	lcd_wrcmd(0x01); /*清除顯示*/
	lcdcounter=0;
}
void lcd_cls()/*清除顯示*/
{ 	lcd_wrcmd(0x01);
	lcdcounter=0;
}
void timer0(void) interrupt 1 /*T0 中斷*/
{ 	//TH0=0xd8; /*12M,10ms*/
	//TL0=0xf6;
 	TH0=0xb1; /*24M,10ms*/
 	TL0=0xe0;

	TR0=1;
	if(sys10mscounter!=0)sys10mscounter--; /*定時器10ms*/
	if(syslimitcounter!=0)syslimitcounter--; /*定時器10ms*/
}

 
void initUart(void)
{
 TMOD|=0x20;
 SCON=0x50;
 PCON|=0x80;
 TH1=0xf3;
 TL1=0xf3;
 TR1=1;
 ES=1;
}
void initTimer(void)
{
 TMOD=0x1;
 TH0=0xb1;
 TL0=0xe0;
}

void rs232(void) interrupt 4
{ unsigned char j;
   if(RI){
	   RI=0;
	   j=SBUF;
	   SBUF = j;  	   
   }
   if(TI) {
       TI=0;
   }
}

lcddemo()
{
	unsigned char j;
	IE=0;P0=0xff;P1=0xff;P2=0xff;P3=0xff; /*初始化T*/
 	initTimer();
	initUart();
	lcd_init();soft_20ms();  
	TR0=1;	ET0=1;	EA=1; TI=0;
	lcd_init(); /*全黑*/
	for(j=0;j<32;j++){lcd_wrdata(0xff);}	
	ZW = 0x00;   ZX = 0x00;  //3
	//while(1)
	{
	/*全黑、橫一、橫二、豎一、豎二、U、Q、ABCD...，*/
		lcd_init(); /*全黑*/
		for(j=0;j<80;j++){lcd_wrdata(0xf0);}
		hard_10ms(500);
		lcd_init(); /*橫一，可參考自行設計符號*/
		lcd_wrcmd(0x40);
		for(j=0;j<8;j++)lcd_wrdata(path1[j]);
		for(j=0;j<100;j++)lcd_wrdata(0);
		hard_10ms(500);
		lcd_init(); /*橫二*/
		lcd_wrcmd(0x40);
		for(j=0;j<8;j++)lcd_wrdata(path2[j]);
		for(j=0;j<100;j++)lcd_wrdata(0);
		hard_10ms(500);
		lcd_init(); /*豎一*/
		lcd_wrcmd(0x40);
		for(j=0;j<8;j++)lcd_wrdata(pats1[j]);
		for(j=0;j<100;j++)lcd_wrdata(0);
		hard_10ms(500);
		lcd_init(); /*豎二*/
		lcd_wrcmd(0x40);
		for(j=0;j<8;j++)lcd_wrdata(pats2[j]);
		for(j=0;j<100;j++)lcd_wrdata(0);
		hard_10ms(500);
		lcd_init();
		lcd_string("UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU");
		hard_10ms(500);
		lcd_init();
		lcd_string("QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ");
		hard_10ms(500);
		lcd_init();
		lcd_string("You are wellcome!   LCD Driver for51");
		hard_10ms(1000);
	}
}