lcd1602.h

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#include <reg51.h>
#define  _lcd1602_h
#define uint unsigned int
#define uchar unsigned char
void delayus(uint k);//延时
void write_LCD_command(uchar command);//命令写入LCD
void write_LCD_data(uchar LCDdata);//数据写入LCD
void init_1602(void);//初始化LCD
void clear_LCD();//LCD清屏
void gotoxy(uchar x,uchar y);//光标在x行y列
sbit rs=P2^5;//指令寄存器的选择
sbit rw=P2^6;//数据写入／读出lcd
sbit en=P2^7;//始能端
//////////////////////////////////////////////////.......1
void write_LCD_command(uchar command)//命令写入LCD
{
	rw=0;//写入LCM
	rs=0;//指令寄存器
	en=1;//始能端
	P3=command;//写命令
	delayus(20);//延时40*20us
	en=0;//关闭始能端
	rw=1;//读取LCM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
}
void write_LCD_data(uchar LCDdata)//数据写入LCD//.......2
{
	rw=0;
	rs=1;
	en=1;
	P3=LCDdata;
	delayus(1);//40us
	en=0;
	rw=1;
}
void init_1602(void)//初始化LCD/////...................3
{
  	write_LCD_command(0x38);// 0x38 单行显示//8位传输
    write_LCD_command(0x0c);// 0x0C 屏幕开启//光标不出现//不闪烁
    //write_LCD_command(0x0e);// 0x0C 屏幕开启//光标出现//不闪烁
    //write_LCD_command(0x0f);// 0x0C 屏幕开启//光标出现 //闪烁
	//write_LCD_command(0x0d);// 0x0C 屏幕开启//光标不出现 //闪烁
}
void clear_LCD()//LCD清屏...........................4
{
	write_LCD_command(0x01);//0x01 LCD清屏	
	write_LCD_command(0x02);//0x02 光标回到左上角
}

void gotoxy(uchar x,uchar y)//光标在x行y列...............7
{
	if(x==1)  
		write_LCD_command(128+y);//128=0b1000,0000
	else
    	write_LCD_command(192+y);//192=0b1100,0000
}

void delayus(uint k)//延时..................................8
{
	k=10*k;//40us
	while(k--);
}