# ======================

from machine import Pin
import utime
PORT = [8, 7, 6, 5, 4, 3, 2, 1] # port connections
DIR = ["0","0","0","0","0","0","0","0"] # port directons
L = [0]*8
#
# This function configures the port pins as outputs ("0") or
# as inputs ("I")
#
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)
    
#
# This function sends 8-bit data (0 to 255) to the PORT
#
def Port_Output(x):

    b = bin(x) # convert into binary
    b = b.replace("0b", "") # remove leading "0b"
    diff = 8 - len(b) # find the length
    for i in range (0, diff):
     b = "0" + b # insert leading os
    for i in range (0, 8):
        if b[i] == "1":
            L[i].value(1)
        else:
            L[i].value(0)
    
#
# Configure PORT to all outputs
#
Configure_Port()
#
# Main program loop. Count up in binary every second
#
cnt = 0
while True:
 Port_Output(cnt) # send cnt to port
 utime.sleep(1) # wait 1 second
 cnt = cnt + 1 # increment cnt
 if cnt > 255:
    cnt = 0