void init_port(void);
void out_port(char );
void delay_();
void setup() {
  int i;
  char blink[2]={0x00,0xfc};
  while(1){
    for(i=0;i<2;i++){
      out_port(blink[i]);
      delay_();
    }
  }
}
void init_port(){
  volatile char *portd_dir=(volatile char*)0x2A;
  *portd_dir=0xfc;
}
void out_port(char x){
  volatile char *portd_out=(volatile char*)0x2B;
  *portd_out=x;//make the pin on
}
void delay_(){
  volatile long i;
  for(i=0;i<200000;i++);
}