LED Blink Test

#!/usr/bin/python

import Adafruit_BBIO.GPIO as GPIO
import time

for i in range(4):
 GPIO.setup("USR%d" % i, GPIO.OUT)

while True:
 for i in range(4):
  GPIO.output("USR%d" % i, GPIO.HIGH)
  time.sleep(2)
  for i in range(4):
   GPIO.output("USR%d" % i, GPIO.LOW)
   time.sleep(2)