joy.py
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00001 #!/usr/bin/env python
00002 
00003 import rospy
00004 import struct
00005 import select
00006 import os
00007 import pyudev
00008 
00009 try:
00010     from sensor_msgs.msg import Joy
00011 except:
00012     import roslib; roslib.load_manifest("joy_mouse")
00013     from sensor_msgs.msg import Joy
00014 
00015     #def main(device_name, rate, frame_id):
00016 
00017 def lookupDeviceFileByNameAttribute(name, prefix="mouse"):
00018     """
00019     lookup device by name attribute. You can check name by
00020     udevadmin info -a -n /dev/input/mouse0
00021     """
00022     context = pyudev.Context()
00023     for device in context.list_devices(subsystem="input"):
00024         for a in device.attributes:
00025             if a == "name" and device.attributes[a] == name:
00026                 for child in device.children:
00027                     if child.sys_name.startswith(prefix):
00028                         return os.path.join("/dev", "input", child.sys_name)
00029     
00030 def main(device_name, autorepeat_rate, frame_id):
00031     rospy.loginfo("reading %s" % (device_name))
00032     joy_pub = rospy.Publisher('joy', Joy)
00033     with open(device_name, "rb" ) as tp_file:
00034         prev_bLeft = 0
00035         prev_bMiddle = 0
00036         prev_bRight = 0
00037         while not rospy.is_shutdown():
00038             if autorepeat_rate == 0:
00039                 buf = tp_file.read(3)
00040             else:
00041                 r,w,e = select.select([tp_file], [], [], 1.0 / autorepeat_rate)
00042                 if tp_file in r:
00043                     buf = os.read(tp_file.fileno(), 3)
00044                 else:
00045                     buf = None
00046             if buf == None:
00047                 x, y = (0, 0)
00048                 bLeft = prev_bLeft
00049                 bMiddle = prev_bMiddle
00050                 bRight = prev_bRight
00051             else:
00052                 button = ord( buf[0] )
00053                 bLeft = button & 0x1
00054                 bMiddle = ( button & 0x4 ) > 0
00055                 bRight = ( button & 0x2 ) > 0
00056                 x,y = struct.unpack( "bb", buf[1:] )
00057             joy_msg = Joy()
00058             joy_msg.header.stamp = rospy.Time.now()
00059             joy_msg.header.frame_id = frame_id
00060             joy_msg.axes = [x, y]
00061             joy_msg.buttons = [bLeft, bMiddle, bRight]
00062             joy_pub.publish(joy_msg)
00063             prev_bLeft = bLeft
00064             prev_bMiddle = bMiddle
00065             prev_bRight = bRight


joy_mouse
Author(s):
autogenerated on Wed Sep 16 2015 04:37:23