2012/1/11 Bill Mania <maniab...@yahoo.com>:
> I have a Happ Fighting UGCI unit connected to my Linux machine.
> I'm using PyUSB 1.0 and attempting to interact with the Happ. I
> can read the events from the joystick and the buttons all day
> long. However, when I attempt to write to the device, on either
> of the two endpoints, the write()s timeout.
>
> Any experience or examples using this device? What are the
> reasons why a write() will timeout?
>
>
> My script appears as follows:
> -------------------------------------------------------------------
>
> import sys
> import usb.core
>
> VENDOR_ID= 0x078b
> PRODUCT_ID = 0x0030
>
> print "Looking for Happ device"
> device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
>
> if device is None:
> sys.exit("Could not find Happ device")
>
> print "Checking for active kernel driver"
> if device.is_kernel_driver_active(0):
> try:
> print "Detaching kernel driver"
> device.detach_kernel_driver(0)
> device.detach_kernel_driver(1)
>
> except usb.core.USBError as e:
> sys.exit("Could not detach kernel driver: %s" % str(e))
>
> try:
> print "Setting configuration"
> device.set_configuration()
>
> except usb.core.USBError as e:
> sys.exit("Could not set configuration: %s" % str(e))
>
> configurations = []
> interfaces = []
> endpoints = []
> for configuration in device:
> configurations.append(configuration)
> for interface in configuration:
> interfaces.append(interface)
> for endpoint in interface:
> endpoints.append(endpoint)
>
> print "Configurations:", len(configurations)
> print "Interfaces:", len(interfaces)
> print "Endpoints:", len(endpoints)
>
> print "Reading data from Happ device, endpoint %d, size %d" % (
> endpoints[0].bEndpointAddress,
> endpoints[0].wMaxPacketSize)
>
> on = True
> onSequence = '\x08\x7F\x7F'
> offSequence = '\08\x00\x00'
>
> while True:
> try:
> print "Reading"
> data = device.read(
> endpoints[0].bEndpointAddress,
> endpoints[0].wMaxPacketSize,
> timeout = 0)
> except usb.core.USBError as e:
> if e.args == ('Operation timed out',):
> print "Timed out"
>
> if len(data) > 0:
> for i in data:
> print i, ',',
> print ' '
>
> try:
> if on:
> on = False
> device.write(
> endpoints[0].bEndpointAddress,
> onSequence,
> interfaces[0])
> else:
> on = True
> device.write(
> endpoints[0].bEndpointAddress,
> offSequence,
> interfaces[0]
> )
>
> except usb.core.USBError as e:
> print "Failed to light switch"
> print str(e)
>
> --
You cannot write and read on the same endpoint. Endpoints are either
configured as IN or OUT, but not both.
--
Best Regards,
Wander Lairson Costa
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