26_joystick.py

#!/usr/bin/env python
#------------------------------------------------------
#
#		This is a program for JoystickPS2 Module.
#
#		This program depend on ADC0832 ADC chip. Follow 
#	the instruction book to connect the module and 
#	ADC0832 to your Raspberry Pi.
#
#------------------------------------------------------
import ADC0832_tmp
import RPi.GPIO as GPIO
import time

btn = 15	# Define button pin

def setup():
	ADC0832_tmp.setup()				# Setup ADC0832
	GPIO.setmode(GPIO.BOARD)	# Numbers GPIOs by physical location
	GPIO.setup(btn, GPIO.IN, pull_up_down=GPIO.PUD_UP)	# Setup button pin as input an pull it up
	global state
	state = ['up', 'down', 'left', 'right']	

def getResult():	#get joystick result
	if ADC0832_tmp.getResult1() == 0:
		return 1		#up
	if ADC0832_tmp.getResult1() == 255:
		return 2		#down

	if ADC0832_tmp.getResult() == 0:
		return 3		#left
	if ADC0832_tmp.getResult() == 255:
		return 4		#right

	if GPIO.input(btn) == 0:
		print 'Button is pressed!'		# Button pressed

def loop():
	while True:
		tmp = getResult()
		if tmp != None:
			print state[tmp - 1]

def destory():
	GPIO.cleanup()				# Release resource

if __name__ == '__main__':		# Program start from here
	setup()
	try:
		loop()
	except KeyboardInterrupt:  	# When 'Ctrl+C' is pressed, the child program destroy() will be  executed.
		destory()