Hi,
I am having problems reading from a usb nfc device that acts like a
keyboard. If I plug the device into my linux computer and scan a nfc tag,
it outputs it out as if a keyboard was typing the keys:
$: 2352481416
However when I try to isolate the device to capture output with pyusb I am
unable to read anything from the device. In the code I posted below it just
continually prints "[]", never reading any data. When I use ipython to read
with a specified timeout (endpoing.read(129, 5000)), it always times out
despite triggering a tag in the mean time.
One thing I noticed is the iInterface number is 4, instead of 0, but I am
not sure how to use that info.
Device info lsusb -v:
Bus 002 Device 009: ID 08ff:0009 AuthenTec, Inc.
>
> Device Descriptor:
>
> bLength 18
>
> bDescriptorType 1
>
> bcdUSB 1.10
>
> bDeviceClass 0 (Defined at Interface level)
>
> bDeviceSubClass 0
>
> bDeviceProtocol 0
>
> bMaxPacketSize0 8
>
> idVendor 0x08ff AuthenTec, Inc.
>
> idProduct 0x0009
>
> bcdDevice 0.08
>
> iManufacturer 1 深圳市思远创智能设备有限公司
>
> http://www.sycreader.com
>
> iProduct 2 (error)
>
> iSerial 3 REV_0008
>
> bNumConfigurations 1
>
> Configuration Descriptor:
>
> bLength 9
>
> bDescriptorType 2
>
> wTotalLength 34
>
> bNumInterfaces 1
>
> bConfigurationValue 1
>
> iConfiguration 0
>
> bmAttributes 0xa0
>
> (Bus Powered)
>
> Remote Wakeup
>
> MaxPower 100mA
>
> Interface Descriptor:
>
> bLength 9
>
> bDescriptorType 4
>
> bInterfaceNumber 0
>
> bAlternateSetting 0
>
> bNumEndpoints 1
>
> bInterfaceClass 3 Human Interface Device
>
> bInterfaceSubClass 1 Boot Interface Subclass
>
> bInterfaceProtocol 1 Keyboard
>
> iInterface 4 RFID Reader With Keyboard
>
> HID Device Descriptor:
>
> bLength 9
>
> bDescriptorType 33
>
> bcdHID 1.10
>
> bCountryCode 33 US
>
> bNumDescriptors 1
>
> bDescriptorType 34 Report
>
> wDescriptorLength 63
>
> Report Descriptors:
>
> ** UNAVAILABLE **
>
> Endpoint Descriptor:
>
> bLength 7
>
> bDescriptorType 5
>
> bEndpointAddress 0x81 EP 1 IN
>
> bmAttributes 3
>
> Transfer Type Interrupt
>
> Synch Type None
>
> Usage Type Data
>
> wMaxPacketSize 0x0008 1x 8 bytes
>
> bInterval 8
>
> Device Status: 0x0000
>
> (Bus Powered)
>
>
>
Python code:
import sys
>
> import usb.core
>
> import usb.util
>
>
>> VENDOR_ID = 0x08ff
>
> PRODUCT_ID = 0x0009
>
>
>> device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
>
>
>> if device.is_kernel_driver_active(0):
>
> try:
>
> device.detach_kernel_driver(0)
>
> except usb.core.USBError as e:
>
> sys.exit("Could not detatch kernel driver: %s" % str(e))
>
>
>> try:
>
> device.set_configuration()
>
> device.reset()
>
> except usb.core.USBError as e:
>
> sys.exit("Could not set configuration: %s" % str(e))
>
>
>> endpoint = device[0][(0, 0)][0]
>
>
>> data = []
>
>
>> while 1:
>
> try:
>
> print data
>
> data += endpoint.read(endpoint.wMaxPacketSize)
>
> print "NEVER PRINTS"
>
> except usb.core.USBError as e:
>
> print e
>
>
>>
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