RPi cycle for Holiday Light Fight

gistfile1.py

# adapted to RPi from http://bildr.org/2011/02/74hc595/#
# http://www.raspberrypi.org/forums/viewtopic.php?f=32&t=15874

import RPi.GPIO as GPIO
import time
from array import *

# using an MCM Raspberry Pi GPIO Breakout Board with Paddle Terminals

SER_Pin=22
RCLK_Pin=23
SRCLK_Pin=24

NUMBER_OF_SHIFT_REGISTERS=1
NUMBER_OF_REGISTER_PINS=NUMBER_OF_SHIFT_REGISTERS * 8

registerPins = [GPIO.HIGH] * NUMBER_OF_REGISTER_PINS

def setup():
	GPIO.setwarnings(False) # look into better way to avoid GPIO.setup warnings

	GPIO.setmode(GPIO.BCM)

	GPIO.setup(SER_Pin, GPIO.OUT)
	GPIO.setup(RCLK_Pin, GPIO.OUT)
	GPIO.setup(SRCLK_Pin, GPIO.OUT)

	clearRegisters()

def clearRegisters():
	for pin in range(NUMBER_OF_REGISTER_PINS):
		registerPins[pin] = GPIO.HIGH

def writeRegisters():
	GPIO.output(RCLK_Pin, GPIO.LOW)

	for pin in xrange(NUMBER_OF_REGISTER_PINS-1, -1, -1):
		GPIO.output(SRCLK_Pin, GPIO.LOW)
		GPIO.output(SER_Pin, registerPins[pin])
		GPIO.output(SRCLK_Pin, GPIO.HIGH)

	GPIO.output(RCLK_Pin, GPIO.HIGH)

def setRegisterPin(index, value):
	registerPins[index] = value

# #############

setup()

while True:
	for targetPin in xrange(NUMBER_OF_REGISTER_PINS): # light up each port in turn
		for pin in xrange(NUMBER_OF_REGISTER_PINS): # we'll only set LOW (turn on) one port at a time
			value = GPIO.LOW if pin==targetPin else GPIO.HIGH
			setRegisterPin(pin, value)

		writeRegisters()

		time.sleep(0.5)