#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This program is copyright (c) 2016, P. Lutus and is released
# under the GPL (http://www.gnu.org/licenses/gpl-3.0.en.html).

import os, sys, re, time, signal

import RPi.GPIO as G

G.setmode(G.BCM)

G.setwarnings(False)

time_delay = 0.1 # seconds

# map binary digits to I/O pins

gpio_pins = tuple(range(2,27))

G.setup(gpio_pins,G.OUT)

n = 0

mask = (2**len(gpio_pins))-1

try:
  while True:
    print('%3d = %08s' % (n,bin(n & mask)[2:]))
    for i in range(len(gpio_pins)):
      s = (2**i & n) != 0
      G.output(gpio_pins[i],s)
    time.sleep(time_delay)
    n = (n+1) & 255
except:
  G.cleanup()
  print('So long for now.')