out of order - the list didn't like it when I sent it before, so... trying
again with the code & messages as an attachment
-Sarah
--- On Fri, 2/25/11, Sarah Messer <[email protected]> wrote:
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)
(See the attached file for code & resultant messages)
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 <[email protected]> wrote:
From: wander.lairson <[email protected]>
Subject: Re: [pyusb-users] TypeError with legacy
DeviceHandle.claimInterface(Interface)
To: [email protected]
Cc: "Sarah Messer" <[email protected]>
Date: Wednesday, February 23, 2011, 3:22 PM
[snip]
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.
You actually have found a bug. The interface is only working when you pass the
interface number. I'll provide a fix as soon as I can (which not necessarily
means fast).
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--
Best Regards,
Wander Lairson Costa
LCoN - Laboratório de Computação Natural - Natural Computing Laboratory
(http://www.mackenzie.com.br/lcon.html)
Programa de Pós-Graduação em Engenharia Elétrica (PPGEE)
Faculdade de Computação e Informática (FCI)
Universidade Presbiteriana Mackenzie - SP - Brazil
------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-----------
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