#include <avr/io.h>    		// Standard AVR header
#include <util/delay.h>		// Delay header
#define	LCD_DPRT  PORTA 	//LCD DATA PORT	
#define	LCD_DDDR  DDRA 		//LCD DATA DDR
#define	LCD_DPIN  PINA 		//LCD DATA PIN
#define	LCD_CPRT  PORTC 	//LCD COMMANDS PORT
#define	LCD_CDDR  DDRC 		//LCD COMMANDS DDR
#define	LCD_CPIN  PINC 		//LCD COMMANDS PIN
#define	LCD_RS  4 			//LCD RS
#define	LCD_RW  5 			//LCD RW
#define	LCD_EN  6 			//LCD EN

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

void lcdCommand( unsigned char cmnd )
{
  LCD_DPRT = cmnd & 0xF0;	//Send high nibble to D4-D7
  LCD_CPRT &= ~ (1<<LCD_RS);	//RS = 0 for command
  LCD_CPRT &= ~ (1<<LCD_RW);	//RW = 0 for write
  LCD_CPRT |= (1<<LCD_EN);	//EN = 1 for H-to-L pulse
  delay_us(1);				//make EN pulse wider
  LCD_CPRT &= ~ (1<<LCD_EN);	//EN = 0 for H-to-L pulse
  delay_us(100);			//wait
  LCD_DPRT = cmnd<<4;		//Send low nibble to D4-D7
  LCD_CPRT |= (1<<LCD_EN);	//EN = 1 for H-to-L pulse
  delay_us(1);				//make EN pulse wider
  LCD_CPRT &= ~ (1<<LCD_EN);	//EN = 0 for H-to-L pulse
  delay_us(100);			//wait
}

void lcdData( unsigned char data )
{
  LCD_DPRT = data & 0xF0;	//Send high nibble to D4-D7
  LCD_CPRT |= (1<<LCD_RS);	//RS = 1 for data
  LCD_CPRT &= ~ (1<<LCD_RW);	//RW = 0 for write
  LCD_CPRT |= (1<<LCD_EN);	//EN = 1 for H-to-L pulse
  delay_us(1);				//make EN pulse wider
  LCD_CPRT &= ~ (1<<LCD_EN);	//EN = 0 for H-to-L pulse
  LCD_DPRT = data<<4;		//Send low nibble to D4-D7
  LCD_CPRT |= (1<<LCD_EN);	//EN = 1 for H-to-L pulse
  delay_us(1);				//make EN pulse wider
  LCD_CPRT &= ~ (1<<LCD_EN);	//EN = 0 for H-to-L pulse
  delay_us(100);			//wait
}

void lcd_init()
{
  LCD_DDDR = 0xFF;
  LCD_CDDR = 0xFF;
  LCD_CPRT &=~(1<<LCD_EN);	//LCD_EN = 0
  lcdCommand(0x33);			//send $33 for init.
  lcdCommand(0x32);			//send $32 for init
  lcdCommand(0x28);			//init. LCD 2 line,5*7 matrix
  lcdCommand(0x0e);			//display on, cursor on
  lcdCommand(0x01);			//clear LCD
  delay_us(2000);	
  lcdCommand(0x06);			//Shift cursor right
}

void lcd_gotoxy(unsigned char x, unsigned char y)
{
  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();
  lcd_gotoxy(1,1);
  lcd_print("The world is but");
  lcd_gotoxy(1,2);
  lcd_print("one country");
  while(1);				//stay here forever
  return 0;
}