#include <avr/io.h>
#include <util/delay.h>

#define RS PD0
#define EN PD1
#define D4 PD2
#define D5 PD3
#define D6 PD4
#define D7 PD5

void lcd_init(void)
{
  DDRD |= (1 << RS) | (1 << EN) | (1 << D4) | (1 << D5) | (1 << D6) | (1 << D7);
  _delay_ms(20);
  send_command(0x33);
  send_command(0x32);
  send_command(0x28);
  send_command(0x06);
  send_command(0x0E);
  send_command(0x01);
  _delay_ms(2);
}

void peekaboo(void)
{
  PORTD |= (1 << EN);
  _delay_ms(2);
  PORTD &= ~(1 << EN);
}

void send_command(unsigned char command)
{
  PORTD = (PORTD & 0x03) | ((command & 0xF0) >> 2);
  PORTD &= ~(1 << RS);
  peekaboo();
  _delay_ms(200);
  PORTD = (PORTD & 0x03) | ((command & 0x0F) << 2);
  peekaboo();
  _delay_ms(2);
}

void send_data(unsigned char data)
{
  PORTD = (PORTD & 0x03) | ((data & 0xF0) >> 2);
  PORTD |= (1 << RS);
  peekaboo();
  _delay_ms(200);
  PORTD = (PORTD & 0x03) | ((data & 0x0F) << 2);
  peekaboo();
  _delay_ms(2);
}

void send_string(char *string)
{
  while(*string != '\0')
  {
    send_data(*string++);
  }
}

void send_integer(int value)
{
  char buffer[4];
  itoa(value,buffer,10);
  send_string(buffer);
}

int main(void)
{
  lcd_init();
  send_integer(69);
  //send_string("anish");
  while(1)
  {

  }
  return 0;
}