#include <reg51.h>
sbit rs=P2^0;
sbit rw=P2^1;
sbit e=P2^2;
void delay(unsigned int);
void cmd1(unsigned char);
void dat1(unsigned char);
void cmd(unsigned char);
void dat(unsigned char);

void main(void)
{
unsigned char mybyte;
	
	
	cmd(0x28);
	cmd(0x01);
	cmd(0x0c);
	cmd(0x80);
	cmd(0x06);
TMOD=0x20; //use Timer 1, mode 2
TH1=0xFd; //
SCON=0x50;
TR1=1; //start timer
while (1) 
{ //repeat forever
while (RI==0); //wait to receive
mybyte=SBUF; //save value
dat(mybyte); //write value to port
 RI=0; 
 if(mybyte==0x08)
 cmd(0x01);
 if(mybyte==0x0d)
 cmd(0xc0);
}
}
void delay(unsigned int t)
{
	unsigned int i,j;
	e=1;
	for(i=0;i<t;i++)
	for(j=0;j<1275;j++);
	e=0;
}
void cmd(unsigned char a)
{
unsigned char x;
x=a&0xf0;
cmd1(x);
x=(a<<4)&0xf0;
cmd1(x);
}
 void dat(unsigned char a)
{
unsigned char x;
x=a&0xf0;
dat1(x);
x=(a<<4)&0xf0;
dat1(x);
}


void cmd1(unsigned char ch)
{
	P2=ch;
	rs=0;
	rw=0;
	delay(10);
}
void dat1(unsigned char ch)
{
	P2=ch;
	rs=1;
	rw=0;
	delay(10);
}