problems with pyusb

[angelie]

im trying to communicate with an humain interface device using python's pyusb. i need to acquire data using the interrupt transfer type.

i have two endpoints,
EP1 = interrupt, out
EP2 = interrupt, in

1 configuration (configuration 1)
1 interface (interface 0)

idVendor = 0xFFFF
idProduct = 0xFFF1

OS: ubuntu

 
import usb
def OpenDevice(idVendor, idProduct):
    devices = []
 
    for b in usb.busses():
        for d in b.devices():
            if d.idVendor = idVendor and d.idProduct = id.Product:
                devices.append(d)
 
    if len(devices) == 1:
        device = devices[0]
        return device
 
    elif not devices:
        print "Device not found"
 
    else
        print "More than one device found"
 
IRCVENDOR = 0xFFFF
POXPRODUCT = 0xFFF1
 
if __name__ == "__main__":
    device = OpenDevice(IRCVENDOR,POXPRODUCT)
    packet_len = 8
 
    dh = device.open()
    dh.setConfiguration(1)
    dh.claimInterface(0)
 
    ADCdata = dh.interruptRead(2,2,100)
    print ADCdata
 
 

do you see any problem with this code?
i get these errors:

usb.USBError: could not set config 1: Operation not permitted

what does this error mean? i tried surfing the net for answers but couldnt find any...i also tried ommiting the dh.setConfiguration line since i only have one configuration but i also got errors (guess that really wasnt the way to solve it :P )

also, what does "error submitting urb" mean?

please help! thanks