/*************利用lcd1602在第1行第1列显示‘A’************
	**********P0接D0~D7，P2.0 P2.1 P2.2分别接RS，RW，E.******/
#include "reg52.h"
//宏定义，变量定义//
#define Uchar unsigned char 
#define Uint  unsigned int
#define DataPort P0
#define Busy 0x80
sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;
//char code s[]="chen xi";
/**************延迟函数***************************
			i代表延迟多ms
		*******/
void defdelay(Uchar i)
	{while(i--);}
//检测忙函数//

/***********写指令函数*****************
			command表示写入的指令代码*/
write_command(Uchar command)
	{
	RS=0;RW=0;
	P0=command;
	E=1;defdelay(60);E=0;
	defdelay(10);
	P0=0xff;
	}
/**********写数据函数*********
			lcdata表示写入的数据*/
write_data(Uchar lcddata)
	{
	RS=1;RW=0;P0=lcddata;
	E=1;defdelay(60);E=0;
	defdelay(10);
	P0=0xff;
	}
/***********读数据函数********************/
read_data()
	{
	Uchar i;
	RS=1;RW=1;E=1;defdelay(60);
	i=P0;
	E=0;
	defdelay(10);
	return i;
	}
/*********判断忙*************/
test_busy()
	{
	while((read_data()&0x80)==0x80);
	}
//初始化函数//
void initial()
		{
		E=0;
		defdelay(15);
		write_command(0x38);
		defdelay(5);
		write_command(0x38);
		defdelay(5);
		write_command(0x38);
		defdelay(5);
		write_command(0x38);
		test_busy();
		write_command(0x08);
		test_busy();
		write_command(0x01);
		test_busy();
		write_command(0x06);
		test_busy();
		write_command(0x0c);
		test_busy();
		}
 /*****************主函数*********************/
main()
	{
	initial();      //初始化
	defdelay(15);
    write_command(0x80);//指定第1行第1列
	test_busy();
	defdelay(15);
	write_data(0x41);//送数据A
	while(1);
	}