it happens on read operation.
Budi
=========================
<boedy.b...@gmail.com> <http://goo.gl/T5NDnD> <http://goo.gl/4xmCrj>
<http://goo.gl/f2Dj7Q> <http://goo.gl/TlJuEd>
<http://goo.gl/d6J1aE> <http://goo.gl/8ezaYx>
=========================
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On Tue, Feb 11, 2014 at 10:06 PM, Wander Lairson Costa <
wander.lair...@gmail.com> wrote:
> 2014-02-11 3:56 GMT-02:00 Setia Budi <boedy.b...@gmail.com>:
> >
> > Hi fellows,
> > I will try to give further information related to my problem.
> >
> > I am facing difficulties in order to send USB commands to an RFID reader.
> > This is the command reference of the device:
> https://github.com/mti-rfid/RFID_Explorer
> >
> > I am working with the MTI RU-824 model.
> >
> > The manufacturer of the device only provide a driver for Windows (using
> .Net), but we need to run the device on Linux. That's why I need to write
> few lines of code in Python as a new "driver".
> >
> > I am using PyUSB for accessing the device, and this is few lines of my
> code:
> >
> >
> ============================================================================
> >
> > import usb.core
> > import usb.util
> > import sys
> >
> > VENDOR_ID = 0x24e9
> > PRODUCT_ID = 0x0824
> >
> > device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
> >
> > if device is None:
> > sys.exit("Could not find Id System Barcode Reader.")
> > else:
> > print 'Device detected'
> >
> > device.set_configuration()
> >
> > cfg = device.get_active_configuration()
> > interface_number = cfg[(0, 0)].bInterfaceNumber
> > alternate_setting = usb.control.get_interface(device, interface_number)
> > usb_interface = usb.util.find_descriptor(
> > cfg, bInterfaceNumber=interface_number,
> > bAlternateSetting=alternate_setting
> > )
> >
> > endpoint_out = usb.util.find_descriptor(
> > usb_interface,
> > # match the first OUT endpoint
> > custom_match=lambda e:
> usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT
> > )
> >
> > endpoint_in = usb.util.find_descriptor(
> > usb_interface,
> > # match the first IN endpoint
> > custom_match=lambda e:
> usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN
> > )
> >
> > endpoint_out.write('0x01')
> > print endpoint_in.read(len('0x01'), 1000)
> >
> >
> =============================================================================
> > My question is on the last 2 lines.
> > I am using endpoint_out to send a command and endpoint_in to read data
> from the reader. Am I correct?
> >
> > The problem is, when I run the code, there is an error message like this:
> > usb.core.USBError: [Errno 110] Operation timed out
> >
> > Anyone can give a clue?
>
> Does this happen on write or read operation?
>
>
> --
> Best Regards,
> Wander Lairson Costa
>
>
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