out-of-order, but trying again to send this...
-Sarah
--- On Fri, 2/25/11, Sarah Messer <ikust...@yahoo.com> wrote:
From: Sarah Messer <ikust...@yahoo.com>
Subject: Fw: Re: [pyusb-users] TypeError with legacy
DeviceHandle.claimInterface(Interface)
To: wander.lair...@gmail.com
Date: Friday, February 25, 2011, 2:39 PM
I tried reply-to-list, but I'm not sure if it went through....
-Sarah
--- On Fri, 2/25/11, Sarah Messer <ikust...@yahoo.com> wrote:
From: Sarah Messer <ikust...@yahoo.com>
Subject: Re: [pyusb-users] TypeError with legacy
DeviceHandle.claimInterface(Interface)
To: pyusb-users@lists.sourceforge.net
Date: Friday, February 25, 2011, 12:42 PM
Thanks for the patch, Wander.
I'm reporting a partial success.
your patch fixes the claimInterface() call
My code then crashes on the first attempt to write to a bulk-out endpoint on
the device. Using my original
claim-by-interface code with your patched usb/legacy.py gives the following
output. (The first few lines are my own error/warning messages; the ultimate
errors are further down in the Traceback):
------CODE OUTPUT-----
Computing message header
sending to address 0:7-6 with 4.000000-second timeout: ['\x01', '\x01', '\xfe',
'\x00', '\x07', '\x00', '\x00', '\x00', '\x01', '\x00', '\x00', '\x00', 'l',
'o', 'c', ' ', 'a', 'l', 'l', '\x00']
Exception in thread OperateScope15:
Traceback (most recent call last):
File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
self.run()
File "/usr/lib/python2.6/threading.py", line 484, in run
self.__target(*self.__args, **self.__kwargs)
File "./acquisition/ACQutil.py", line 390, in Operate
self.Arm()
File "./acquisition/ACQutil.py", line 420, in Arm
self.Scope.arm(self.run._TrigStr)
File "./acquisition/scope.py", line 504, in arm
self.reset()
File "./acquisition/scope.py", line 539, in reset
self.write('loc all') #lock all
File "./acquisition/scope.py", line 1036, in write
self.hand.bulkWrite(self.bo.address,sending,scopetimeout*1000)
File "/usr/local/lib/python2.6/site-packages/usb/legacy.py", line 148, in
bulkWrite
return self.dev.write(endpoint, buffer, self.__claimed_interface, timeout)
File
"/usr/local/lib/python2.6/site-packages/usb/core.py", line 601, in write
_interop.as_array(data),
File "/usr/local/lib/python2.6/site-packages/usb/_interop.py", line 134, in
as_array
return array.array('u', data)
TypeError: array item must be unicode character
------/END CODE OUTPUT--------------
I'm also attaching the method which generated the above output:
----------CODE SNIPPET----------
def write(self, message):
'''Sends a command to the USB scope and does not expect a response.
declaration:
write(self, message)
message - the string to be sent to the scope.'''
self.runlog.log(3,'Computing
message header')
msgID=chr(0x01) #DEV_DEP_MSG_OUT (cmd to Bulk-Out Endpoint)
bTagInv=chr((~self.bTag)&(0xff)) #bitwise inverse(bTag)
msg=list(message)
msglen=len(msg)
if msglen== 0:
self.runlog.log(-1,'null message not allowed')
#spec allows much longer lengths, but these
#aren't yet implemented
if msglen>255:
self.runlog.log(-1,'message too long')
#pad to a length with a multiple of 4
bytes
if msglen%4 == 1 :
msg.extend([chr(0x00),chr(0x00),chr(0x00)])
elif msglen%4 == 2 :
msg.extend([chr(0x00),chr(0x00)])
elif msglen%4 == 3 :
msg.extend([chr(0x00)])
#Force conversions to single-byte elements,
#since Python prefers to use 16-bit integers
#internally
#self.runlog.log(3,'compiling full message')
sending=[msgID,chr(self.bTag),bTagInv,NULL]
sending.extend(Num2List(msglen))
sending.extend([chr(0x01),NULL,NULL,NULL])
sending.extend(msg)
self.runlog.log(3,'sending to address %s-%d with %f-second timeout:
%s'%(self.id[2], self.bo.address, scopetimeout, sending))
self.hand.bulkWrite(self.bo.address,sending,scopetimeout*1000)
self.runlog.log(3,'message sent')
self.bTag+=1
if self.bTag>255:
self.bTag=0x01
------------/END CODE SNIPPET-----------
I also tried a work-around with the unpatched pyusb 1.0 and an
integer (0) in place of the Interface in the call to claimInterface(). That
yielded analogous results, although instead of a TypeError, I think I got a
SegmentationFault.
I'm going to branch my code into 1.0-friendly and 0.1-friendly versions. If you
want to fire patches at me as you have time, I'll try running them through the
0.1-friendly code. In the meantime, I'll try to learn 1.0.
What I've seen of 1.0 so far looks like it's much nicer than 0.1, but I'm still
trying to learn how it goes.
There also seems to be some changes since
http://pyusb.sourceforge.net/docs/1.0/tutorial.html was written: Manually
stepping through the sample code, I get
AttributeError: 'Device' object has no attribute 'get_interface_altsetting'
Thanks for putting all this together!
As a general comment, I've just discovered "pydoc -w
usb"... which makes me
giddy. Giddy, I tell you.
-Sarah
--- On Wed, 2/23/11, wander.lairson <wander.lair...@gmail.com> wrote:
From: wander.lairson <wander.lair...@gmail.com>
Subject: Re: [pyusb-users] TypeError with legacy
DeviceHandle.claimInterface(Interface)
To: pyusb-users@lists.sourceforge.net
Date: Wednesday, February 23, 2011, 3:39 PM
Please, find attached a little patch that should fix your problem. I could not
test it because my dev machine died a month ago. Please, report if it worked
thus I can commit it.
Wander
2011/2/23 Sarah Messer <ikust...@yahoo.com>
of course, as soon as I hit "send", i find this:
http://pyusb.sourceforge.net/docs/1.0/tutorial.html
...
-Sarah
--- On Wed, 2/23/11, Sarah Messer <ikust...@yahoo.com> wrote:
From: Sarah Messer <ikust...@yahoo.com>
Subject: [pyusb-users] TypeError with legacy
DeviceHandle.claimInterface(Interface)
To: pyusb-users@lists.sourceforge.net
Date: Wednesday, February 23, 2011, 2:55 PM
Hello,
I've recently updated my OS (to openSuSe 11.3), after changing my motherboard
(long story). Probably more relevant is
the fact that at the same time I'm going from pyusb 0.1ish to pyusb-1.0.0-a1
Code that had been working well is now going through the compatibility/legacy
layer, which seems to _almost_ work. The issue appears when I claim the USB
interface. Here's the tail of the traceback:
File "./acquisition/scope.py", line 975, in _foundrightscope
self.hand.claimInterface(self.face)
File "/usr/local/lib/python2.6/site-packages/usb/legacy.py", line 225, in
claimInterface
util.claim_interface(self.dev, interface)
File "/usr/local/lib/python2.6/site-packages/usb/util.py", line 191, in
claim_interface
device._ctx.managed_claim_interface(device, interface)
File "/usr/local/lib/python2.6/site-packages/usb/core.py", line 112, in
managed_claim_interface
self.backend.claim_interface(self.handle, i)
File "/usr/local/lib/python2.6/site-packages/usb/_debug.py", line 52, in
do_trace
return f(*args, **named_args)
File "/usr/local/lib/python2.6/site-packages/usb/backend/libusb10.py", line
471, in claim_interface
_check(_lib.libusb_claim_interface(dev_handle, intf))
ArgumentError: argument 2: <type 'exceptions.TypeError'>: wrong type
"self.hand" is of type <class 'usb.legacy.DeviceHandle'> (It came from a call
to "dev.open()", where "dev" is of type <class 'usb.legacy.Device'>.)
"self.face" is of type <class 'usb.legacy.Interface'>
The wiki page that I used to use for reference
(http://wiki.erazor-zone.de/wiki:projects:python:pyusb:pydoc) doesn't appear
to talk about conversion or use of the new & improved pyusb...
Could someone tell me where to go for conversion / interface docs? I'd like to
do as little code conversion as possible, but I'm not sure where to start.
Thanks
-Sarah
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