from machine import Pin
import utime

PORT = [7,6,5,4,3,2,1,0]
DIR = ['0','0','0','0','0','0','0','0']
L = [0]*8

def Configure_Port():
    for i in range(0, 8):
        if DIR[i] == '0':
            L[i] = Pin(PORT[i], Pin.OUT)
            print (L[i], end=' ')
        else:
            L[i] = Pin(PORT[i], Pin.IN)
    return

def Port_Output(x):
    b = bin(x)
    b = b.replace('0b', '')
    diff = 8 - len(b)
    for i in range (0, diff):
        b = '0' + b

    for i in range (0, 8):
        if b[i] == '1':
            L[i].value(1)
        else:
            L[i].value(0)
    return

Configure_Port()

cnt = 0
while True:
    Port_Output(cnt)
    utime.sleep(0.3)
    cnt = cnt + 1
    if cnt > 255:
        cnt = 0