void setup() {
  // put your setup code here, to run once:
  volatile char *PORT_F_DIR_REG = (char*) 0x30;
  *PORT_F_DIR_REG = 0xFF;
  volatile char *PORT_K_DIR_REG;
  *PORT_K_DIR_REG = 0x00;

}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *PORT_F_DATA_REG;
  
  PORT_F_DATA_REG = 0x31;
  
  *PORT_F_DATA_REG = 0x01;
  
  volatile int increments = 0;
  
  volatile char x = 0x00;

  while (increments < 8) {
    for(volatile long i = 0; i < 1000000; i++);
    *PORT_F_DATA_REG |=  (*PORT_F_DATA_REG << 1);
    for(volatile long i = 0; i < 1000000; i++);
    
    increments++;
  }
}