Re: [Tutor] Pyusb: get data via USB sent from mouse

[W W]

On Sat, Mar 7, 2009 at 9:35 AM, andré palma andre...@gmail.com wrote:
 Hi folks, I'm new on pyusb programming and to learn how to get data i'm
 trying  to get  data  sent  from  my mouse.
 I've download a program called usbview( http://www.kroah.com/linux/usb/ ) to
 display the device descriptors of any USB device  pluged  to my  computer.
 I made a peace of code that was supposed to get the data sent from my mouse
 but when i try to run it there is an error saying that the device is busy
  =S

I haven't used pyusb, but my guess is that because your window manager
is using the device already that it can't get a lock on it.

I've used pyserial for communicating with a USB device, but I've never
tried communication with a mouse.

HTH,
Wayne
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[Tutor] Pyusb: get data via USB sent from mouse

[andré palma]

Hi folks, I'm new on pyusb programming and to learn how to get data i'm 
trying  to get  data  sent  from  my mouse.
I've download a program called usbview( http://www.kroah.com/linux/usb/ 
) to display the device descriptors of any USB device  pluged  to my  
computer. 

I made a peace of code that was supposed to get the data sent from my 
mouse but when i try to run it there is an error saying that the device 
is busy  =S




Code:
===

import sys
import usb
import time
import struct
import array
import math


class DeviceDescriptor(object) :
   def __init__(self, vendor_id, product_id, interface_id) :
   self.vendor_id = vendor_id
   self.product_id = product_id
   self.interface_id = interface_id
  
  
   def getDevice(self) :


   busses = usb.busses()

   for bus in busses:   
   for device in bus.devices :

   if device.idVendor == self.vendor_id :
   if device.idProduct == self.product_id :
   return device
   return None






class PlugUSBDevice(object) :
  
   PLUG_VENDOR_ID = 0x1c4f # mouse vendor id

   PLUG_PRODUCT_ID = 0x0003# mouse product id
   PLUG_INTERFACE_ID = 0# mouse interface number
   PLUG_INTERRUPT_IN_EP = 0x81L# mouse end point address

   def __init__(self) :
   self.device_descriptor = 
DeviceDescriptor(PlugUSBDevice.PLUG_VENDOR_ID,
 
PlugUSBDevice.PLUG_PRODUCT_ID,
 
PlugUSBDevice.PLUG_INTERFACE_ID)

   self.device = self.device_descriptor.getDevice()
   self.handle = None

   def open(self) :
   self.device = self.device_descriptor.getDevice()
   self.handle = self.device.open()
   self.handle.claimInterface(self.device_descriptor.interface_id)

   def close(self) :
   self.handle.releaseInterface()

   def getDataPacket(self, bytesToGet) :
   return self.handle.interruptRead(PlugUSBDevice.PLUG_INTERRUPT_IN_EP, 
bytesToGet, 15)



if __name__ == __main__:
   device = PlugUSBDevice()
   device.open()
   print device.getDataPacket(4)
  




The error:

 File readusb.py, line 61, in module
   device.open()
 File readusb.py, line 50, in open
   self.handle.claimInterface(self.device_descriptor.interface_id)
usb.USBError: could not claim interface 0: Device or resource busy

==

What am i doing wrong? =S
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