Spied on the USB bus, I see that reader.open() does not actually open the
port though it seem to pass a handle object to readerHandler . There are no
messages passed and no activity on the bus.
On debugging the code, I see that reader.open() just returns DeviceHandle
object without any call to open the port. Is this intended?
-------------------------------------code
debug--------------------------------------------------------
C:\Python26>python.exe -m pdb code.py
-> import usb
(Pdb) l
1 -> import usb
2
3 buses = usb.busses()
4
5 for bus in buses:
6 for device in bus.devices:
7 if device.idVendor == 0x10C4 and device.idProduct == 0x81f2:
8 reader = device
9
10 readerHandler = reader.open()
11
(Pdb) b 10
Breakpoint 1 at code.py:10
(Pdb) c
-> readerHandler = reader.open()
(Pdb) s
--Call--
> c:\python26\lib\site-packages\usb\legacy.py(311)open()
-> def open(self):
(Pdb) s
> c:\python26\lib\site-packages\usb\legacy.py(316)open()
-> return DeviceHandle(self.dev)
(Pdb) s
--Call--
> c:\python26\lib\site-packages\usb\legacy.py(132)__init__()
-> def __init__(self, dev):
(Pdb) l
127 ),
128 lambda i: i.alternateSetting)
129 ]
130
131 class DeviceHandle(object):
132 -> def __init__(self, dev):
133 self.dev = dev
134 self.__claimed_interface = -1
(Pdb) n
> c:\python26\lib\site-packages\usb\legacy.py(133)__init__()
-> self.dev = dev
(Pdb) n
> c:\python26\lib\site-packages\usb\legacy.py(134)__init__()
-> self.__claimed_interface = -1
(Pdb) n
--Return--
> c:\python26\lib\site-packages\usb\legacy.py(134)__init__()->None
-> self.__claimed_interface = -1
(Pdb) n
--Return--
>
c:\python26\lib\site-packages\usb\legacy.py(316)open()-><usb.leg...010320F0>
-> return DeviceHandle(self.dev)
(Pdb) l
311 def open(self):
312 r"""Open the device for use.
313
314 Return a DeviceHandle object
315 """
316 -> return DeviceHandle(self.dev)
317
318 class Bus(object):
319 r"""Bus object."""
320 def __init__(self):
321 self.dirname = ''
(Pdb) p self.dev
<usb.core.Device object at 0x010AE570>
(Pdb)
-----------------------------------------code
debug------------------------------------------
On Tue, Jan 18, 2011 at 1:10 AM, Emmanuel Blot <eblot...@gmail.com> wrote:
> On Mon, Jan 17, 2011 at 4:31 PM, Sridev Nair <sksridevn...@gmail.com>
> wrote:
> > Some issue related to port opening & response capture which I am unable
> to
> > figure out.
>
> I think at this point, it would be helpful to spy on the USB bus to
> see what's going on with the driver that works, and compare it with
> the command you send using pyusb.
>
> Cheers,
> Manu
>
>
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