#import usb stuff
import usb.core
import usb.util

#find device
dev = usb.core.find(idVendor=0x04f2,idProduct=0x0939)

# was it found?
if dev is None:
    raise ValueError('Device not found')

# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()


bmRqueType=0x80;
bRque=0x0;
wVal=0x0;
wIndex=0x0;
wLength=0x0;

ret = dev.ctrl_transfer(bmRqueType,bRque,wVal,wIndex,wLength)
print ret