PyUSB

2011/7/28 C Duff <duffman.c.d@...>:
> Hi,
> I'm new to pyusb and have what's probably a simple mistake.
> I'm trying to get python to connect to Microchip's libusb example running on
> a PIC18F14K50.
> I can find and send data to the PIC fine, but pyusb has an error whenever I
> try to read data:
> http://paste.pound-python.org/show/10154/
>
> Here is the python code, I just quickly changed it from the example. (I've
> tried various sizes for the read function 1,7,8,64,1000 all seem to result
> in the same error).
> http://paste.pound-python.org/show/10158/
>
> I know that the data is coming through because you can see it with usbmon
> (it's device 6:004):
> http://paste.pound-python.org/show/10156/
>
> What am I doing wrong?
>
Try to read 64 instead of 8 bytes...

-- 
Best Regards,
Wander Lairson Costa

Nope, didn't work. I've tried 1,7,8,64,1000 nothing seems to work - they all
give the same error.
I should have mentioned this in the first message but I'm running ubuntu
11.04 64 with python 2.7, if that makes a difference.

Campbell

On Sat, Jul 30, 2011 at 10:24 AM, C Duff <duffman.c.d@...> wrote:
> Nope, didn't work. I've tried 1,7,8,64,1000 nothing seems to work - they all
> give the same error.
> I should have mentioned this in the first message but I'm running ubuntu
> 11.04 64 with python 2.7, if that makes a difference.

Try the following, it should work. I tested this under Ubuntu 10.10 64bit
with Python 2.6. The last reset command is necessary due to potential
bugs (data toggle) of the Microchip USB Firmware Framework.

------------------------------------
#!/usr/bin/env python

import usb.core
import usb.util

#find our device
dev = usb.core.find(idVendor=0x04D8, idProduct=0x0204)

#was it found?
if dev is None:
    raise ValueError('Device not found')

#set the active configuration. with no args we use first config.
dev.set_configuration()

#turn light on
print "Toggle LED by sending Toggle_LED command"
dev.write(1, [0x080], 0, 1000)

print "Sending read switch command"
dev.write(1,[0x081],0,1000)
s=dev.read(0x81,64,0,5000)
print "Echo read switch command 0x81"
print s[0]
print "Read switch status, 1 means not pressed, 0 means pressed"
print s[1]
dev.reset()
------------------------------------

mcuee@...$ python testmchp_libusb1.py
Toggle LED by sending Toggle_LED command
Sending read switch command
Echo read switch command 0x81
129
Read switch status, 1 means not pressed, 0 means pressed
1

mcuee@...$ python testmchp_libusb1.py
Toggle LED by sending Toggle_LED command
Sending read switch command
Echo read switch command 0x81
129
Read switch status, 1 means not pressed, 0 means pressed
0



-- 
Xiaofan

Thanks Xiaofan,
I didn't know about the reset - I'll make sure to add that. And everything
now works.

The first cause was a stupid mistake on my behalf. I thought I'd changed
the packet size to 8 on my firmware (as I'm operating at low speed) but I
hadn't (or I'd changed back at some point). It was only when I checked
lsusb -v that I found the error.

Thanks again for the help everyone,

Campbell

Have you monitored a USB transfer with the scale using its original driver?
I suggest the 'usbmon' kernel module. Use Wine or a VM if it's a
windows-only app.

On Wed, Jul 27, 2011 at 08:10, David Brunnthaler <david@...:

>  Hello,
>
> I'm right now trying to get pyUSB to read from my usb-scale but i'm
> running into some issues there.
>
> My python code: http://paste.pound-**python.org/show/**10095/**<http://paste.pound-python.org/show/10095/>
> and my output: http://paste.pound-**python.org/show/**10096/<http://paste.pound-python.org/show/10096/>
>
> As you can see, it just stops at line 49 of the code.
>
>
> In the Tutorial (
> http://pyusb.sourceforge.net/docs/1.0/tutorial.html#how-am-i-supposed-to-work)
> it says you first have to issue a "set_configuration" request.
>
> I tried all three different methods (line 31, line 33 and lines 35 to 37)
> but it always tells me: http://paste.pound-**python.org/show/**10097/<http://paste.pound-python.org/show/10097/>
>
>
> Any idea what I'm doing wrong, or how I can establish a successful
> connection?
>
> Thanks in advance
> David
>
> --
> david brunnthaler
> david@...
> austria
>
>
> ------------------------------------------------------------------------------
> Got Input?   Slashdot Needs You.
> Take our quick survey online.  Come on, we don't ask for help often.
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> pyusb-users@...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>

2011/7/27 David Brunnthaler <david@...>:
> Hello,
>
> I'm right now trying to get pyUSB to read from my usb-scale but i'm running
> into some issues there.
>
> My python code: http://paste.pound-python.org/show/10095/
> and my output: http://paste.pound-python.org/show/10096/
>
> As you can see, it just stops at line 49 of the code.
>
>
> In the Tutorial
> (http://pyusb.sourceforge.net/docs/1.0/tutorial.html#how-am-i-supposed-to-work)
> it says you first have to issue a "set_configuration" request.
>
> I tried all three different methods (line 31, line 33 and lines 35 to 37)
> but it always tells me: http://paste.pound-python.org/show/10097/
>
>
> Any idea what I'm doing wrong, or how I can establish a successful
> connection?
>
Is there a driver attached to the device?

Wander

Thanks for your replies.

First of all: I'm using the official drivers from that RS232 <-> USB 
adapter (http://www.ftdichip.com/Drivers/D2XX.htm)

I monitored the USB transfer with wireshark and you can see part of the 
compressed output here:
http://pastebin.com/4jf79vGQ

And if you want you can also have a look at the full file: 
http://dl.i-am-alive.at/wireshark_full.txt

Correct me if I'm wrong:
What that tells me is that my endpoint adress is either 0x82 or 0x01.
The length is most of the time 64. So is assume that this is my "nrByteRead"

Can someone look at the logs and tell me if I'm right or wrong? I think 
I may still use the wrong "bConfigurationValue"..

Thanks in advance
David



Am 27.07.11 16:20, schrieb Ian Daniher:
> Have you monitored a USB transfer with the scale using its original 
> driver? I suggest the 'usbmon' kernel module. Use Wine or a VM if it's 
> a windows-only app.
>
> On Wed, Jul 27, 2011 at 08:10, David Brunnthaler <david@... 
> <mailto:david@...>> wrote:
>
>     Hello,
>
>     I'mright now trying to get pyUSB to read from my usb-scale but i'm
>     running into some issues there.
>
>     My python code: http://paste.pound-python.org/show/10095/
>     and my output: http://paste.pound-python.org/show/10096/
>
>     As you can see, it just stops at line 49 of the code.
>
>
>     In the Tutorial
>     (http://pyusb.sourceforge.net/docs/1.0/tutorial.html#how-am-i-supposed-to-work)
>     it says you first have to issue a "set_configuration" request.
>
>     I tried all three different methods (line 31, line 33 and lines 35
>     to 37) but it always tells me:
>     http://paste.pound-python.org/show/10097/
>
>
>     Any idea what I'm doing wrong, or how I can establish a successful
>     connection?
>
>     Thanks in advance
>     David
>
>     --
>     david brunnthaler
>     david@... <mailto:david@...>
>     austria
>
>     ------------------------------------------------------------------------------
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>     _______________________________________________
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>     pyusb-users@...
>     <mailto:pyusb-users@...>
>     https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>
>
> ------------------------------------------------------------------------------
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/pyusb-users


-- 
david brunnthaler

0043 664 911 37 40
david@...
museumstraße 4 / 3 / 8
4020 linz
austria

If you're using a RS232-USB adapter, PyUSB may not work, as the other driver
is likely blocking.

Additionally, the "pyserial" library may be of more use, sparing you a layer
of abstraction.

On Wed, Jul 27, 2011 at 15:58, David Brunnthaler <david@...:

>  Thanks for your replies.
>
> First of all: I'm using the official drivers from that RS232 <-> USB
> adapter (http://www.ftdichip.com/Drivers/D2XX.htm)
>
> I monitored the USB transfer with wireshark and you can see part of the
> compressed output here:
> http://pastebin.com/4jf79vGQ
>
> And if you want you can also have a look at the full file:
> http://dl.i-am-alive.at/wireshark_full.txt
>
> Correct me if I'm wrong:
> What that tells me is that my endpoint adress is either 0x82 or 0x01.
> The length is most of the time 64. So is assume that this is my
> "nrByteRead"
>
> Can someone look at the logs and tell me if I'm right or wrong? I think I
> may still use the wrong "bConfigurationValue"..
>
> Thanks in advance
> David
>
>
>
> Am 27.07.11 16:20, schrieb Ian Daniher:
>
> Have you monitored a USB transfer with the scale using its original driver?
> I suggest the 'usbmon' kernel module. Use Wine or a VM if it's a
> windows-only app.
>
> On Wed, Jul 27, 2011 at 08:10, David Brunnthaler <david@...:
>
>>  Hello,
>>
>> I'm right now trying to get pyUSB to read from my usb-scale but i'm
>> running into some issues there.
>>
>> My python code: http://paste.pound-python.org/show/10095/
>> and my output: http://paste.pound-python.org/show/10096/
>>
>> As you can see, it just stops at line 49 of the code.
>>
>>
>> In the Tutorial (
>> http://pyusb.sourceforge.net/docs/1.0/tutorial.html#how-am-i-supposed-to-work)
>> it says you first have to issue a "set_configuration" request.
>>
>> I tried all three different methods (line 31, line 33 and lines 35 to 37)
>> but it always tells me: http://paste.pound-python.org/show/10097/
>>
>>
>> Any idea what I'm doing wrong, or how I can establish a successful
>> connection?
>>
>> Thanks in advance
>> David
>>
>> --
>> david brunnthaler
>> david@...
>> austria
>>
>>
>> ------------------------------------------------------------------------------
>> Got Input?   Slashdot Needs You.
>> Take our quick survey online.  Come on, we don't ask for help often.
>> Plus, you'll get a chance to win $100 to spend on ThinkGeek.
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>> _______________________________________________
>> pyusb-users mailing list
>> pyusb-users@...
>> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>>
>>
>
>
> ------------------------------------------------------------------------------
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>
>
>
> _______________________________________________
> pyusb-users mailing listpyusb-users@... href="nethttps://lists.sourceforge.net/lists/listinfo/pyusb-users" target="_new">nethttps://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>
> --
> david brunnthaler
>
> 0043 664 911 37 40
> david@...
>
> museumstraße 4 / 3 / 8
> 4020 linz
> austria
>
>
>
> ------------------------------------------------------------------------------
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> pyusb-users@...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>

So you would suggest, that I use the Virtual COM Port Driver 
(http://www.ftdichip.com/Drivers/VCP.htm) instead of the D2XX Direct 
Driver (http://www.ftdichip.com/Drivers/D2XX.htm) I'm currently using?
Does this matter at all?

Problem is I'm a novice when it comes to setting up a usb or serial 
connection..
So please be patient with me, when I may ask stupid questions.

Thanks
David



Am 27.07.11 22:17, schrieb Ian Daniher:
> If you're using a RS232-USB adapter, PyUSB may not work, as the other 
> driver is likely blocking.
>
> Additionally, the "pyserial" library may be of more use, sparing you a 
> layer of abstraction.
>
> On Wed, Jul 27, 2011 at 15:58, David Brunnthaler <david@... 
> <mailto:david@...>> wrote:
>
>     Thanks for your replies.
>
>     First of all: I'm using the official drivers from that RS232 <->
>     USB adapter (http://www.ftdichip.com/Drivers/D2XX.htm)
>
>     I monitored the USB transfer with wireshark and you can see part
>     of the compressed output here:
>     http://pastebin.com/4jf79vGQ
>
>     And if you want you can also have a look at the full file:
>     http://dl.i-am-alive.at/wireshark_full.txt
>
>     Correct me if I'm wrong:
>     What that tells me is that my endpoint adress is either 0x82 or 0x01.
>     The length is most of the time 64. So is assume that this is my
>     "nrByteRead"
>
>     Can someone look at the logs and tell me if I'm right or wrong? I
>     think I may still use the wrong "bConfigurationValue"..
>
>     Thanks in advance
>     David
>
>
>
>     Am 27.07.11 16:20, schrieb Ian Daniher:
>>     Have you monitored a USB transfer with the scale using its
>>     original driver? I suggest the 'usbmon' kernel module. Use Wine
>>     or a VM if it's a windows-only app.
>>
>>     On Wed, Jul 27, 2011 at 08:10, David Brunnthaler
>>     <david@... <mailto:david@...>> wrote:
>>
>>         Hello,
>>
>>         I'mright now trying to get pyUSB to read from my usb-scale
>>         but i'm running into some issues there.
>>
>>         My python code: http://paste.pound-python.org/show/10095/
>>         and my output: http://paste.pound-python.org/show/10096/
>>
>>         As you can see, it just stops at line 49 of the code.
>>
>>
>>         In the Tutorial
>>         (http://pyusb.sourceforge.net/docs/1.0/tutorial.html#how-am-i-supposed-to-work)
>>         it says you first have to issue a "set_configuration" request.
>>
>>         I tried all three different methods (line 31, line 33 and
>>         lines 35 to 37) but it always tells me:
>>         http://paste.pound-python.org/show/10097/
>>
>>
>>         Any idea what I'm doing wrong, or how I can establish a
>>         successful connection?
>>
>>         Thanks in advance
>>         David
>>
>>         --
>>         david brunnthaler
>>         david@... <mailto:david@...>
>>         austria
>>
>>         ------------------------------------------------------------------------------
>>         Got Input?   Slashdot Needs You.
>>         Take our quick survey online.  Come on, we don't ask for help
>>         often.
>>         Plus, you'll get a chance to win $100 to spend on ThinkGeek.
>>         http://p.sf.net/sfu/slashdot-survey
>>         _______________________________________________
>>         pyusb-users mailing list
>>         pyusb-users@...
>>         <mailto:pyusb-users@...>
>>         https://lists.sourceforge.net/lists/listinfo/pyusb-users
>>
>>
>>
>>
>>     ------------------------------------------------------------------------------
>>     Got Input?   Slashdot Needs You.
>>     Take our quick survey online.  Come on, we don't ask for help often.
>>     Plus, you'll get a chance to win $100 to spend on ThinkGeek.
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>>
>>
>>     _______________________________________________
>>     pyusb-users mailing list
>>     pyusb-users@...  <mailto:pyusb-users@...>
>>     https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>     -- 
>     david brunnthaler
>
>     0043 664 911 37 40
>     david@... <mailto:david@...>
>
>     museumstraße 4 / 3 / 8
>     4020 linz
>     austria
>
>
>     ------------------------------------------------------------------------------
>     Got Input?   Slashdot Needs You.
>     Take our quick survey online.  Come on, we don't ask for help often.
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>     _______________________________________________
>     pyusb-users mailing list
>     pyusb-users@...
>     <mailto:pyusb-users@...>
>     https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>
>
> ------------------------------------------------------------------------------
> Got Input?   Slashdot Needs You.
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-- 
david brunnthaler

0043 664 911 37 40
david@...
museumstraße 4 / 3 / 8
4020 linz
austria

2011/7/22 Bill Patterson <bpatterson@...>:
> Is there an installer available for Python 2.7? My company wants to move all
> of our scripts onto the same version, however we have a couple that use
> PyUSB to discover and connect and control test devices.
>
I guess you are talking about PyUSB 0.4.3. At the time of release, the
current version used to be 2.6. I haven't updated to 2.7 since then,
and nowadays I have no Windows workstation to generate a new one (this
is one of the reasons PyUSB development is frozen). I can upload an
installer as soon as I can, but generating one isn't that hard, you
need to have Python 2.7 installed (of course), libusb-win32 and the
Visual C++ version which Python was built with (you can use Express
Version, I guess). With that, enter in Visual C++ command prompt, go
to PyUSB folder and run "python setup.py bdist --format=wininst" or
"python setup.py bdist --format=msi". MSI installer is kind of new and
I haven't tried that, took it from Python docs. More details can be
found here: http://docs.python.org/distutils/builtdist.html.

Don't forget that you have to make libusb-win32 include and lib files
available to Visual C++. The easiest way is to copy them to Visual C++
respective folders.

Regards,
Wander

Thanks for the help.
I gave it a try after downloading and installing VC++ Express.
Had to make a couple modifications to the setup.py file.
However get the following errors:

# first run using format=msi
C:\Documents and Settings\XPMUser\My Documents\PyUSB-1.6\PyUSB-1.6>python setup.py bdist --format=msi
running bdist
running bdist_msi
running build
running build_py
copying d2xx\defines.py -> build\lib.win32-2.7\d2xx
copying d2xx\__init__.py -> build\lib.win32-2.7\d2xx
running build_ext
building 'd2xx._d2xx' extension
error: Unable to find vcvarsall.bat


# Call vxvarsall.bat from the commandline....
C:\Documents and Settings\XPMUser\My Documents\PyUSB-1.6\PyUSB-1.6>vcvarsall.bat

Setting environment for using Microsoft Visual Studio 2010 x86 tools.

# Try again using wininst instead of msi....
C:\Documents and Settings\XPMUser\My Documents\PyUSB-1.6\PyUSB-1.6>python setup.py bdist --format=wininst
running bdist
running bdist_wininst
running build
running build_py
copying d2xx\defines.py -> build\lib.win32-2.7\d2xx
copying d2xx\__init__.py -> build\lib.win32-2.7\d2xx
running build_ext
building 'd2xx._d2xx' extension
error: Unable to find vcvarsall.bat

Bill




-----Original Message-----
From: wander.lairson [mailto:wander.lairson@...] 
Sent: Friday, July 22, 2011 12:58 PM
To: pyusb-users@...
Subject: Re: [pyusb-users] PyUSB with Python 2.7

2011/7/22 Bill Patterson <bpatterson@...>:
> Is there an installer available for Python 2.7? My company wants to move all
> of our scripts onto the same version, however we have a couple that use
> PyUSB to discover and connect and control test devices.
>
I guess you are talking about PyUSB 0.4.3. At the time of release, the
current version used to be 2.6. I haven't updated to 2.7 since then,
and nowadays I have no Windows workstation to generate a new one (this
is one of the reasons PyUSB development is frozen). I can upload an
installer as soon as I can, but generating one isn't that hard, you
need to have Python 2.7 installed (of course), libusb-win32 and the
Visual C++ version which Python was built with (you can use Express
Version, I guess). With that, enter in Visual C++ command prompt, go
to PyUSB folder and run "python setup.py bdist --format=wininst" or
"python setup.py bdist --format=msi". MSI installer is kind of new and
I haven't tried that, took it from Python docs. More details can be
found here: http://docs.python.org/distutils/builtdist.html.

Don't forget that you have to make libusb-win32 include and lib files
available to Visual C++. The easiest way is to copy them to Visual C++
respective folders.

Regards,
Wander

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On Sat, Jul 23, 2011 at 6:39 AM, Bill Patterson
<bpatterson@...> wrote:
> C:\Documents and Settings\XPMUser\My Documents\PyUSB-1.6\PyUSB-1.6>python setup.py bdist --format=msi

This pyusb mailing list is deal with the python binding for libusb.
http://sourceforge.net/projects/pyusb/

Your PyUSB is deal with python binding for FTDI's proprietary d2xx.
http://bleyer.org/pyusb/


-- 
Xiaofan

On Sat, Jul 23, 2011 at 7:51 AM, Xiaofan Chen <xiaofanc@...> wrote:
> This pyusb mailing list is deal with the python binding for libusb.
> http://sourceforge.net/projects/pyusb/
>
> Your PyUSB is deal with python binding for FTDI's proprietary d2xx.
> http://bleyer.org/pyusb/
>

So you might want to contact the author to build the binary for you.

I tried to do it myself and it seems to work after a few tweaks.
It does not seem to work with VC++ 2010, but VC++2008
seems to work.

C:\Users\mcuee>c:\Python27\python.exe
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import d2xx
>>> d = d2xx.listDevices(d2xx.OPEN_BY_DESCRIPTION)
>>> print d
('FT232R USB UART', 'Stellaris Evaluation Board A', 'Stellaris Evaluation Board
B', 'Amontec JTAGkey-2 A', 'Amontec JTAGkey-2 B')
>>> h=d2xx.open(0)
>>> print h
<FtobjType object at 0x019DC0E0>

-- 
Xiaofan

Thanks XiaoFan,
Can you forward me the tweaks?  I still can't get it to compile, though not a big VC++ user either!
Bill

-----Original Message-----
From: Xiaofan Chen [mailto:xiaofanc@...] 
Sent: Friday, July 22, 2011 9:23 PM
To: pyusb-users@...
Subject: Re: [pyusb-users] PyUSB with Python 2.7

On Sat, Jul 23, 2011 at 7:51 AM, Xiaofan Chen <xiaofanc@...> wrote:
> This pyusb mailing list is deal with the python binding for libusb.
> http://sourceforge.net/projects/pyusb/
>
> Your PyUSB is deal with python binding for FTDI's proprietary d2xx.
> http://bleyer.org/pyusb/
>

So you might want to contact the author to build the binary for you.

I tried to do it myself and it seems to work after a few tweaks.
It does not seem to work with VC++ 2010, but VC++2008
seems to work.

C:\Users\mcuee>c:\Python27\python.exe
Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import d2xx
>>> d = d2xx.listDevices(d2xx.OPEN_BY_DESCRIPTION)
>>> print d
('FT232R USB UART', 'Stellaris Evaluation Board A', 'Stellaris Evaluation Board
B', 'Amontec JTAGkey-2 A', 'Amontec JTAGkey-2 B')
>>> h=d2xx.open(0)
>>> print h
<FtobjType object at 0x019DC0E0>

-- 
Xiaofan

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On Wed, Jul 27, 2011 at 3:28 AM, Bill Patterson
<bpatterson@...> wrote:
> Thanks XiaoFan,
> Can you forward me the tweaks?  I still can't get it to compile, though not
> a big VC++ user either!

Here it is. The modified archive and the 32bit Python 2.7 binary (msi format)
are inside.
http://code.google.com/p/picusb/downloads/list
PyUSB-1.6_mod.zip



-- 
Xiaofan

Thank you!!!!!

-----Original Message-----
From: Xiaofan Chen [mailto:xiaofanc@...] 
Sent: Tuesday, July 26, 2011 3:54 PM
To: pyusb-users@...
Subject: Re: [pyusb-users] PyUSB with Python 2.7

On Wed, Jul 27, 2011 at 3:28 AM, Bill Patterson
<bpatterson@...> wrote:
> Thanks XiaoFan,
> Can you forward me the tweaks?  I still can't get it to compile, though not
> a big VC++ user either!

Here it is. The modified archive and the 32bit Python 2.7 binary (msi format)
are inside.
http://code.google.com/p/picusb/downloads/list
PyUSB-1.6_mod.zip



-- 
Xiaofan

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If the device is a USB -> parallel converter, it should behave like a
parallel port, so why don't try to use it as a parallel port?

2011/7/8 Emilio Bellini <emilio.bellini@...>:
> Hi all,
> I'm sorry if this is a stupid question.
> I want to control a circuit, which has 8 relè, and I want to switch them
> on/off via software. Originally my idea was to control it using a parallel
> port, but my laptop hasn't it. So, I'm trying to use an USB port with an USB
> to Parallel converter. I can see the Device, and also I'm able to send some
> data to the parallel port, but I don't know how to communicate efficently
> with the Device. If I use dev.write(1, 'test', 0) or dev.write(1, '1', 0),
> the result is the same: the 8 pins of my parallel port are set on the state
> '00001000'.
> The question is: is there a simple way to control the state of the 8 bits?
>
> Thank you in advanced for any hint!
> Best regards,
> Emilio
>
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>



-- 
Best Regards,
Wander Lairson Costa