void port_init();
void out_port(unsigned char x);
void delay1();

void delay1() {
  volatile long i;
  for (i = 0; i < 200000; i++);  // Basic delay loop
}

void port_init() {           /////DDRB (Data Direction Register for Port B)
  DDRB = 0xF3;  // Set PB0, PB1, PB4, PB5 as outputs (0b11110011)
}

void out_port(unsigned char x) { //PORTB (Port B Data Register)
  PORTB = x;  // Set the output value on Port B
}

void setup() {
  port_init();  // Initialize the port
}

void loop() {
  uint8_t i;
  unsigned char y;
  while (1) {
    for (i = 0; i < 8; i++) {
      y = 1 << i;
      out_port(y);  // Output the value to PORTB
      delay1();     // Delay for visualization
    }
  }
}