void init_port(void);
void outport(unsigned char);
void delay1(int);
unsigned char in_data(void);

void init_port(){
  DDRD = 0x3C;
}

void setup() {
  init_port();
  blink();
}

void blink()
{
  unsigned char k;
  while(1)
  {
    k = in_data() & 0x0F;
    while(k == 0)
    {
      k = in_data() & 0x0F;
      if(k == 1) outport(0x01);
      if(k == 2) outport(0x02);
      if(k == 4) outport(0x04);
      if(k == 8) outport(0x08);
      delay1(1);
    }
  }
}

void outport(unsigned char x){
  PORTD = x << 2;
}

void delay1(int count)
{
  volatile long i;
  while(count)
  {
    for(i=0; i<1000; i++);
    count--;
  }
}

unsigned char in_data(void){
  unsigned char indata;
  indata = PINC;
  return indata;
}