Callback function

Just a quick bit of code to show how the callback function works - 1+2 to connect, then it starts streaming accelerometer and (if available) motionplus data. Press the home button to end.

I'm using two global variables - loop to keep the main loop running, and callback_active to make sure that when you do press the home button, the loop doesn't terminate while the callback function is doing something (I was getting all sorts of exceptions and segmentation faults before including this).

#!/usr/bin/python

import cwiid

loop = True
callback_active = False

def main():
 print "Press 1+2"
 wiimote = cwiid.Wiimote()
 print "OK"

 wiimote.mesg_callback = callback
 wiimote.enable(cwiid.FLAG_MESG_IFC | cwiid.FLAG_MOTIONPLUS)
 wiimote.rpt_mode = cwiid.RPT_ACC | cwiid.RPT_BTN | cwiid.RPT_MOTIONPLUS

 global loop
 global callback_active
 while loop or callback_active:
     # Messages will be sent to callback function
     pass

 wiimote.disable(cwiid.FLAG_MESG_IFC | cwiid.FLAG_MOTIONPLUS)

#----------------------------------------------------------------------
def callback (mesg_list, time):
 global callback_active
 callback_active = True
 for (message, data) in mesg_list:
     if message == cwiid.MESG_ACC:
         print data
     elif message == cwiid.MESG_MOTIONPLUS:
         print data
     elif message == cwiid.MESG_BTN:
         if data & cwiid.BTN_HOME:
             global loop
             loop = False
     else:
         pass
 callback_active = False

#----------------------------------------------------------------------
main()