from machine import Pin
from utime import sleep
 
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)
        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)
    sleep(1)
    cnt = cnt + 1
    if cnt > 255:
        cnt = 0