Thank you for the pointers, Manu & Wander!
Now I have a better understanding. However, this simple control message code
is throwing up the error,
ctypes.ArgumentError: argument 3: <type 'exceptions.TypeError'>: wrong type
Tried all tricks, still am I missing something? Any help appreciated
Best Regards,
Sridev
-------Code -------------
import usb
buses = usb.busses()
for bus in buses:
for device in bus.devices:
if device.idVendor == 0x10C4 and device.idProduct == 0x81f2:
reader = device
readerHandler = reader.open()
readerHandler.setConfiguration(1)
readerHandler.claimInterface(0)
#get reader info command - first command as per vendor docs - hex string
msg_str = "020200013803"
data = 64
results = readerHandler.controlMsg(64, msg_str, data, timeout=1000)
print results
reader.releaseInterface()
reader.close()
--------Code-----------
-----------Error
Traceback (most recent call last):
File "simplectrlmsg.py", line 44, in <module>
results = readerHandler.controlMsg(64, msg_str, data, timeout=1000)
File "C:\Python26\lib\site-packages\usb\legacy.py", line 203, in
controlMsg
timeout = timeout
File "C:\Python26\lib\site-packages\usb\core.py", line 668, in
ctrl_transfer
self.__get_timeout(timeout)
File "C:\Python26\lib\site-packages\usb\_debug.py", line 53, in do_trace
return f(*args, **named_args)
File "C:\Python26\lib\site-packages\usb\backend\libusb01.py", line 488, in
ctrl_transfer
timeout
ctypes.ArgumentError: argument 3: <type 'exceptions.TypeError'>: wrong type
------------Error------------------------
On Tue, Jan 4, 2011 at 12:00 AM, Emmanuel Blot <eblot...@gmail.com> wrote:
> > Any help/insight?
>
> Just a thought:
> Are you sure the USB device does not expect some configuration (using
> control request, such as parity, baudrate, ...) prior to sending the
> actual data to the serial output ?
>
> That might explain why it works when the demo code opens the port (it
> may explicitly configure the USB device).
>
> You might want to spy on the USB communication link to observe the
> actual packets (on Windows, HHD USB tools are great to do so, and I
> think there is a demo version of this [cheap] software application)
> sent with the demo application.
>
> You may also want to have a look at the Linux kernel driver (for
> example, http://lxr.free-electrons.com/source/drivers/usb/serial/cp210x.c)
> to help understanding how the CP210 USB device works.
>
> Cheers,
> Manu
>
>
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