Joypad - Python

L'idée ici est d'utiliser un joypad pour piloter un micro controller via sans fil (type bluetooth).
Je n'explique pas le bluetooth dans cet exemple, cela fera éventuellement l'objet d'un autre article, et je me contente juste d'attirer l'attention sur la partie joypad et utilisation d'une lib python.

La librairie python INPUTS permet de piloter des entrées tels que: Clavier, Souris, Joypad

Mes test ont été faits sous windows 10, avec python 2.7
Sous windows cette lib ne permet d'utiliser que le joypad XBox360

Je me suis basé sur cette image pour le mapping de mes variables:

Joypad XBOX 360

En premier lieux: installer la lib; en CMD tapper : ( tout est expliqué ici : INPUTS )

pip install inputs

L'exemple de code qui va suivre, utilise les threads en python.

Pour mon projet j'ai utilisé les threads, car la commande principale qui lisait les événements du gamepad, interrompaient tout autre processus. Donc avec le muli-threads, cela ne pose plus de problème pour les taches annexes.

Code:

	# gamepad.py
	#
	# Copyright 2018 Francois De Bue
	#
	# This program show how work with game pad and a thread
	# This was used to drive a robot with arduino
	from threading import Thread
	from inputs import get_gamepad
	class XPAD(Thread): # def class typr thread
	def __init__(self):
	Thread.__init__(self) # thread init class (don't forget this)
	self.A = 0 # all vars of gamepad, set init val to 0
	self.B = 0
	self.X = 0
	self.Y = 0
	self.LBumper = 0
	self.RBumper = 0
	self.LThumb = 0
	self.RThumb = 0
	self.LTrigger = 0
	self.RTrigger = 0
	self.Back = 0
	self.Start = 0
	self.LStickX = 0
	self.LStickY = 0
	self.RStickX = 0
	self.RStickY = 0
	self.DPadX = 0
	self.DPadY = 0
	def run(self): # run is a default Thread function
	while True: # loop for ever
	for event in get_gamepad(): # check events of gamepads, if not event, all is stop
	if event.ev_type == "Key": # category of binary respond values
	if event.code == "BTN_SOUTH":
	self.A = event.state
	elif event.code == "BTN_EAST":
	self.B = event.state
	elif event.code == "BTN_WEST":
	self.X = event.state
	elif event.code == "BTN_NORTH":
	self.Y = event.state
	elif event.code == "BTN_TL":
	self.LBumper = event.state
	elif event.code == "BTN_TR":
	self.RBumper = event.state
	elif event.code == "BTN_THUMBL":
	self.LThumb = event.state
	elif event.code == "BTN_THUMBR":
	self.RThumb = event.state
	elif event.code == "BTN_START":
	self.Back = event.state
	elif event.code == "BTN_SELECT":
	self.Start = event.state
	elif event.ev_type == "Absolute": # category of analog values
	# some values are from -32000 to 32000, or -256 to 256
	# here all values are mapped from -512 to 512 by bitshifting
	if event.code[-1:] == "Z":
	event.state = event.state<<1 # reduce range from 256 to 512
	else:
	event.state = event.state>>6 # reduce range from 32000 to 512
	if event.state < 40 and event.state > -40: # dead zone of my joypad, check this one for yours
	event.state = 0
	if event.code == "ABS_Z":
	self.LTrigger = event.state
	elif event.code == "ABS_RZ":
	self.RTrigger = event.state
	elif event.code == "ABS_X":
	self.LStickX = event.state
	elif event.code == "ABS_Y":
	self.LStickY = event.state
	elif event.code == "ABS_RX":
	self.RStickX = event.state
	elif event.code == "ABS_RY":
	self.RStickY = event.state
	elif event.code == "ABS_HAT0Y":
	self.DPadX = event.state
	elif event.code == "ABS_HAT0X":
	self.DPadY = event.state
	# sample to use 2 channels
	# insert your code here, if you want to compute different mode from your joypad
	if (self.LStickX+self.LStickY)>20:
	print( "LstickX: {}, LStickY: {}".format (self.LStickX,self.LStickY))
	if (self.RStickX+self.RStickY)>20:
	print( "RstickX: {}, RStickY: {}".format (self.RStickX,self.RStickY))
	def main():
	''' with gamepad thread, count continue all the time '''
	gamePad = XPAD() # creation thread joypad
	count = 0 # count represent continuity of your code
	gamePad.start() # start of gamepad thread, to read input of game pad (multitasking forever)
	while True:
	count = count + 1 # your code
	if gamePad.A != 0: # your interaction
	count = count - 100
	print ("Count value: {}").format(count)
	print count
	gamePad.joint() # wait the end of joypad thread
	if __name__ == "__main__":
	main()

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