2011/1/1 Sridev Nair <sksridevn...@gmail.com>:
> Hi,
>
> I have been working with pyUSB (Python 2.6) for last couple of days on
> Windows. It works great and I could access the auto-id reader within
> no time. However, there is this read command timing out issue which I
> am unable to resolve. In fact it is a bit weird since it seem to work
> when I parallely run the demo application of the same reader provided
> by the manufacturer. The device driver spec, code & error output are
> below.
>
> Any help in solving the problem?
>
> Sridev
>
> ---------------------------device specs-----------------------
>
> Device:
> Device class: 0
> Device sub class: 0
> Device protocol: 0
> Max packet size: 64
> idVendor: 4292
> idProduct: 33266
> Device Version: 256
> Configuration: 1
> Total length: 32
> selfPowered: 0
> remoteWakeup: 0
> maxPower: 200
> Interface: 0
> Alternate Setting: 0
> Interface class: 255
> Interface sub class: 0
> Interface protocol: 0
> Endpoint: 0x81
> Type: 2
> Max packet size: 64
> Interval: 0
> Endpoint: 0x1
> Type: 2
> Max packet size: 64
> Interval: 0
>
> ----------------------------code--------------------------------
> import usb.core
> import usb.util
>
> dev = usb.core.find(idVendor=0x10c4, idProduct=0x81f2)
>
> if dev is None:
> raise ValueError('No Device')
>
> dev.set_configuration()
>
> msg = [0x03, 0x02, 0x00, 0x03, 0x07, 0xD0, 0x03]
>
> bytes = dev.write(0x01, msg, 0, 2000)
>
> received = dev.read(0x81, bytes, 0, 5000)
>
Try to read about 1024 bytes, instead of the same data read. If there
is more data in the device buffer than you ask for, this may happen.
--
Best Regards,
Wander Lairson Costa
LCoN - Laboratório de Computação Natural - Natural Computing Laboratory
(http://www.mackenzie.com.br/lcon.html)
Programa de Pós-Graduação em Engenharia Elétrica (PPGEE)
Faculdade de Computação e Informática (FCI)
Universidade Presbiteriana Mackenzie - SP - Brazil
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