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diff --git a/content/Informatique/wiimote.rst b/content/Informatique/wiimote.rst new file mode 100755 index 0000000..21db1de --- /dev/null +++ b/content/Informatique/wiimote.rst @@ -0,0 +1,121 @@ +.. -*- mode: rst -*- +.. -*- coding: utf-8 -*- + +Controling the wiimote (I) +########################## + + +:date: 2009-03-11 +:tags: Programmation, Wiimote + + +Creating the plugin for wminput +------------------------------- + +There are a lot of tutorials about how to configure cwiid. I let you follow +them for getting a functionnal system for your wiimote. You can read the links +at the end of this article. Be sure your system works well before continuing. + +This is a code that we'll use as template for the creation of our driver. Used +as main, it use pygame for displaying the infrared sources the wiimote can +detect, but it is also compatible as plugin for wminput ( even if it does +anything for now ). + +You can get it here : +`wm\_control.py <http://www.chimrod.com/downloads/wiimote/ir_control_0.py>`_ +( This code is licenced under GPL 3+ ) + +About the code : + +:: + + import wmplugin + +This import does not exist, but is created by wminput when executed. It provide +the connexion with the wminput core. Just put ( or link ) the script in the +wminput plugin path ( on my debian this is the /usr/lib/cwiid/plugins/ ) + +:: + + def wmplugin_init(id, wiimote_arg): + wmplugin.set_rpt_mode(id, cwiid.RPT_IR | cwiid.RPT_BTN) + return + + def wmplugin_info(): + return [], + [("X", wmplugin.REL | wmplugin.ABS, 1024, 0, 0, 0), + ("Y", wmplugin.REL | wmplugin.ABS, 768, 0, 0, 0)], + [] + +We instanciate the wiimote object here and configure it in the IR mode. The +name is choosen by wminput if we want to use it as plugin. We define that the +plugin return the coordonates X and Y in a relative system ( +you can get the signification of all the parameters here : `actions list +<http://abstrakraft.org/cwiid/browser/trunk/wminput/action_enum.txt>`_) + +If we want to define new butons, we just have to name them in the first list, +the'll be accessible in the configuration file as plugin.[buton\_name] = ACTION + +:: + + def wmplugin_exec(messages): + '''Wiimote callback managing method + Recieves a message list, each element is different, see the libcwiid docs''' + x = y = 0 + + for msg in messages: + if msg[0] == cwiid.MESG_IR: + x, y = ir_sensor.get_movement(msg) + return [], (x, y) + +Here is the core of our driver. The name is choosen by wminput too, as the +format value we return. We have in parameter the list of the messages the +wiimote has sent. + +If we have defined buton we need to return their state here. It is a boolean +saying if the buton is pressed ( True ) or not ( False ). + +This method doesn't send any others parameters, and this is a problem when we +need to store data between two calls ( ie for saving the cursor position ). One +way for passing throught is to use global variables. But it is unelegant and +can cause problems if we want to use our code in imports. So we'ill use a list +as default parameter and let python save it as you can see here : + +:: + + >>> def meth(a=[]): + ... a.append(1) + ... print a + ... + >>> meth() + [1] + >>> meth() + [1, 1] + >>> meth() + [1, 1, 1] + +So the ir\_sensor.get\_movement method is defined with each parameter we +want to save as an optional list + +:: + + def get_movement(msg, _old_points=[], _old_position = [0, 0]): + return 0, 0 + +The get\_movement method need to return the difference between the old position +of the cursor and the new one in tuple : (0, 0) mean that the cursor didn't +move, (-10, 0) mean a deplacement to the left. + +For now, the plugin doesn't move the cursor, and doesn't read what the wiimote +has sent. But you know everything for creating your own plugin for controlling +your wiimote. You can use all the cwiid method for setting the led, activating +the differents modes of your wiimote ( IR, Acc, rumble ... ), and define here +your own actions. + +I'll explain the core of the movement analysis in IR mode in the next article. + +Links : + `The cwiid project <http://abstrakraft.org/cwiid/>`_ + +`Install Cwiid ( Ubuntu Documentation +) <https://help.ubuntu.com/community/CWiiD>`_ |