title: Raspberry Pyusb gets Resource busy
body: <p>I'm trying to connect my Raspberry PI to Pic4550 via USB. (Pic function is ok with windows c# program!).
  So I have installed rpi 2, pyusb, and tried to communicate with the help of [<a href="https://github.com/walac/pyusb/blob/master/docs/tutorial.rst][1]" rel="nofollow">https://github.com/walac/pyusb/blob/master/docs/tutorial.rst][1]</a> </p>
  
  <p>I get connected to the USB device, lsusb shows:</p>
  
  <blockquote>
    <p>Bus 001 Device 006: ID 04d8:0080 Microchip Technology, Inc.</p>
  </blockquote>
  
  <p>The python prog finds the device! Gets the right config but cannot write message: </p>
  
  <blockquote>
    <p>usb.core.USBError: [Errno 16] Resource busy</p>
  </blockquote>
  
  <p>I tried to run as sudo, I have added rule:</p>
  
  <blockquote>
    <p>SUBSYSTEM=="usb", ATTR{idVendor}=="04d8", ATTR{idProduct}=="0080",
    MODE="666"</p>
  </blockquote>
  
  <p>Anyway I get the same resource busy</p>
  
  <p>Any glue-help-link? </p>