8051 C, read/write eeprom AT24C02

#include<AT89X52.H>

void delay1ms(unsigned int count);
void _nop(unsigned int count);
//---------------------------------------
void start_iic(void);
void stop_iic(void);
void write_iic(unsigned char Data);
unsigned char read_iic();
unsigned char read_byte(unsigned int addr);
void write_byte(unsigned int addr, unsigned char Data);
//---------------------------------------
unsigned char i;
sbit SDA = P3^5;
sbit SCL = P3^4;
//-----------------
sbit rs = P2^7;		
sbit rw = P2^6;
sbit ep = P2^5;
lcd_init();
lcd_clear();
bit lcd_busy();
lcd_wcmd(unsigned char cmd);
lcd_pos(unsigned char pos);
lcd_putchar(unsigned char dat);	
int o;
//---------------------------------------

void main(void)
{
int u;	 	 
unsigned char mystr[16] = "eeprom test";
unsigned char r_data[16];

	lcd_init(); 			
	lcd_clear();
	
	write_byte(0x01,mystr[0]); // in this case letter 'e'
	delay1ms(10);

	r_data[0] = read_byte(0x01);
	lcd_putchar(r_data[o]);
} 

//---------------------------------------
void start_iic(void)
{
    SDA = 1;
	SCL = 1;
	_nop(2);
	SDA = 0;
	_nop(2);
	SCL = 0;
	_nop(2);
}

void stop_iic(void)
{
	SDA = 0;	    	
	_nop(2);
	SCL = 1;
	_nop(2);
	SDA = 1;	
}
 
void write_iic(unsigned char Data)
{    
	for (i=0;i<8;i++)
	{
        if ((Data&0x80) == 0) SDA = 0; else SDA = 1;
		SCL=1;SCL=0;
		Data<<=1;
	}
  	SCL = 1; 
	_nop(2);
	SCL = 0;
  }
	
unsigned char read_iic()
{
    unsigned char Data=0;

    SDA = 1;	
	for (i=0;i<8;i++)
	{
		SCL   = 1;		
		Data  = (Data|SDA);
		Data<<= 1;		
		SCL   = 0;
		_nop(1);
	}
	SCL = 1;		
	_nop(2);
	SCL = 0;
	return Data;
}

unsigned char read_byte(unsigned int addr)
{
   	unsigned char Data;
	start_iic();
	write_iic(0xA0|((addr>>7)&0x0E));
	write_iic((unsigned char)addr&0xFF);
	start_iic();
	write_iic(0xA1);
	Data = read_iic();
	stop_iic();
   	return(Data);
}

void write_byte(unsigned int addr, unsigned char Data)
{
	start_iic();
	write_iic(0xA0|((addr>>7)&0x0E));
	write_iic((unsigned char)addr&0xFF);	// send address low	
	write_iic(Data);
	stop_iic();	
}

//-----------------------------------------------				 
void delay1ms(unsigned int count) 
{  
    unsigned int i;		       		
    while(count) 
	{
        i = 115; 
		while(i>0) i--;
        count--;
    }
}

void _nop(unsigned int count)
{  
	int t;
	for(t=0; t<count; t++);
}

//-----------------------------------------------
bit lcd_busy()
{							 
	bit result;
	rs = 0;
	rw = 1;
	ep = 1;
	result = (bit)(P0 & 0x80);
	ep = 0;
	return result;	
}

lcd_wcmd(unsigned char cmd)
{							
	while(lcd_busy());
	rs = 0;
	rw = 0;
	ep = 0;
	P0 = cmd;
	ep = 1;
	ep = 0;		
}

lcd_pos(unsigned char pos)
{							
	lcd_wcmd(pos|0x80);
}

lcd_putchar(unsigned char dat)	
{							 
	while(lcd_busy());
	rs = 1;
	rw = 0;
	ep = 0;
	P0 = dat;
	ep = 1;
	ep = 0;	
}

lcd_init()
{							 
	lcd_wcmd(0x38);
	delay1ms(1);
	lcd_wcmd(0x0c);			
	delay1ms(1);
	lcd_wcmd(0x06);			
	delay1ms(1);
}

lcd_clear()
{							 
	lcd_wcmd(0x01);
}

	for (u=0; u<16; u++)
           {
		write_byte(0x01+u,mystr[u]);
	}
	
	delay1ms(10);

	for (u=0; u<16; u++)
	{
		r_data[u] = read_byte(0x01+u); 			
	}


		lcd_pos(0);
		o = 0;
		while(r_data[o]!= '\0')
		{						 
			lcd_putchar(r_data[o]);
			o++;
		}

getstring(unsigned int shift)
{
	int u;
	unsigned char getdata[16] = "                ";

	for (u=0; u<16; u++)
	{
		getdata[u] = read_byte((shift*16)+u); 			
		P1=getdata[u]; //to see what happens on led's
		delay1ms(100); //slowdown
		lcd_putchar(getdata[u]);
	}
}

setstring(unsigned int shift, unsigned char *mystr)
{
	int u;
	for (u=0; u<16; u++)
    {
		write_byte((shift*16)+u,mystr[u]);
	    delay1ms(1);
	}
}

void main(void)
{
	unsigned int shift=0;
	unsigned char mystr[16] =   "Hello world 8051";

	lcd_init(); 			
	lcd_clear();
	lcd_pos(0);

	setstring(shift, mystr);
	delay1ms(10);
	getstring(shift);
}