Lab3A

// Lab 3A
// lightChaser.ino
// CPU used in Arduino Uno
#define __AVR_ATmega328P__
// CPU frequency in Hz.
#define F_CPU 16000000UL
// define LED sequence delay
#define SEQ_DELAY 200
#include <avr/io.h>
#include <util/delay.h>
int main (void) {
  // configure PORT B PIN 0~5 as output
  DDRB = (1 << DDB5) | (1 << DDB4) | (1 << DDB3) |
          (1 << DDB2) | (1 << DDB1) | (1 << DDB0);
  DDRD = (1 << DDD7) | (1 << DDD6) | (1 << DDD5) |
          (1 << DDD4);
  // forever loop
  while (1) {
    PORTD = (1 << PIN4);  // LED 1
    _delay_ms(SEQ_DELAY);
    PORTD = (1 << PIN5);  // LED 2
    _delay_ms(SEQ_DELAY);
    PORTD = (1 << PIN6);  // LED 3
    _delay_ms(SEQ_DELAY);
    PORTD = (1 << PIN7);  // LED 4
    _delay_ms(SEQ_DELAY);
    PORTD = 0x00;         // turn off Port D
   
    PORTB = (1 << PIN0);  // LED 5
    _delay_ms(SEQ_DELAY);
    PORTB = (1 << PIN1);  // LED 6
    _delay_ms(SEQ_DELAY);
    PORTB = (1 << PIN2);  // LED 7
    _delay_ms(SEQ_DELAY);
    PORTB = (1 << PIN3);  // LED 8
    _delay_ms(SEQ_DELAY);
    PORTB = (1 << PIN4);  // LED 9
    _delay_ms(SEQ_DELAY);
    PORTB = (1 << PIN5);  // LED 10
    _delay_ms(SEQ_DELAY);
    PORTB = 0x00;         // turn off Port B
  }
}