#define F_CPU 8000000UL
#include <avr/io.h>    
#include <util/delay.h>
#define	LCD_PRT  PORTA 
#define	LCD_DDR  DDRA 	
#define	LCD_PIN  PINA 	
#define	LCD_RS  0 	
#define	LCD_RW  1 	
#define	LCD_EN  2 	

void delay_us(int d)			
{								
  _delay_us(d);
}

void delay_ms(int d)
{
  _delay_ms(d);
}

void lcdCommand( unsigned char cmnd ){
  LCD_PRT = (LCD_PRT & 0x0F) | (cmnd & 0xF0);
  LCD_PRT &= ~ (1<<LCD_RS);		
  LCD_PRT &= ~ (1<<LCD_RW);	
  LCD_PRT |= (1<<LCD_EN);	
  delay_us(1);			
  LCD_PRT &= ~ (1<<LCD_EN);

  delay_us(20);

  LCD_PRT = (LCD_PRT & 0x0F) | (cmnd << 4);
  LCD_PRT |= (1<<LCD_EN);	
  delay_us(1);			
  LCD_PRT &= ~ (1<<LCD_EN);	
}

void lcdData( unsigned char data )
{
  LCD_PRT = (LCD_PRT & 0x0F) | (data & 0xF0);
  LCD_PRT |= (1<<LCD_RS);	
  LCD_PRT &= ~ (1<<LCD_RW);	
  LCD_PRT |= (1<<LCD_EN);	
  delay_us(1);			
  LCD_PRT &= ~ (1<<LCD_EN);	
	
  LCD_PRT = (LCD_PRT & 0x0F) | (data << 4);
  LCD_PRT |= (1<<LCD_EN);		
  delay_us(1);				
  LCD_PRT &= ~ (1<<LCD_EN);		
}

void lcd_init(){
  LCD_DDR = 0xFF;			
    
  LCD_PRT &=~(1<<LCD_EN);	
  delay_us(2000);		
  lcdCommand(0x33);		
  delay_us(100);		
  lcdCommand(0x32);		
  delay_us(100);		
  lcdCommand(0x28);		
  delay_us(100);		
  lcdCommand(0x0e);		
  delay_us(100);		
  lcdCommand(0x01);		
  delay_us(2000);		
  lcdCommand(0x06);			
  delay_us(100);	
}

void lcd_gotoxy(unsigned char x, unsigned char y)
{  //table 12-5
  unsigned char firstCharAdr[] = {0x80, 0xC0, 0x94, 0xD4};   

  lcdCommand(firstCharAdr[y-1] + x - 1);
  delay_us(100);	
}

void lcd_print( char * str )
{
  unsigned char i = 0 ;

  while(str[i]!=0)
  {
    lcdData(str[i]);
    i++ ;
  }
}

int main(void) 
{	
  lcd_init();
  while(1)
  {	
	lcd_gotoxy(1,1);
	lcd_print("The world is but");
	lcd_gotoxy(1,2);
	lcd_print("one country     ");
	delay_ms(1000);
	lcd_gotoxy(1,1);
	lcd_print("and mankind its ");
	lcd_gotoxy(1,2);
	lcd_print("citizens        ");
	delay_ms(1000);
  }
  return 0;
}