//Connect Eight LEDs to port F bit 0 to bit 7. Glow all 8 LEDs
#define DDRF  (*(volatile uint8_t*)0x30)
#define PORTF (*(volatile uint8_t*)0x31)
void setup() {
  // put your setup code here, to run once:
  DDRF |= 0XFF;
}

void delayy(void){
  volatile uint32_t i;
  for(i=0; i<1000000; i++);
}
void loop() {
  // put your main code here, to run repeatedly:
  PORTF |= 0XFF;
  delayy();
  PORTF &= ~(0XFF);
  delayy();
}