[pyusb-users] libusb1 Callback thread
Hello... I try to do some async transfer. The program bellow actualy 'near' work. It setup 10 transfers and should print the received bytes in callback. The problem is that callback is not done at receive complete! In example below I expect callback while sleep comand is executed but instead got all callbacks when I close device... I know that USBPoller/USBPollerThread has something to do with my problem but don't know how to use it. Here is my test program: #*** import usb1,time def openUsb(vid,pid,name): context = usb1.USBContext() for dev in context.getDeviceList(skip_on_error=True): if (dev.getVendorID()==vid) (dev.getProductID()==pid): if dev.getProduct()==name: return dev.open() USBdev=openUsb(0x16d0,0x06ad,'Q_ANALISER') if not USBdev: print Device not found exit(0) def callback(transfer): print Just received %4.0f Bytes % transfer.getActualLength() transfer=[] for i in range(10): transfer.append(USBdev.getTransfer()) transfer[-1].setControl(160, 3, 0, 0, 4096, callback, None, 1000) transfer[-1].submit() time.sleep(1) print sleep 1 done. time.sleep(1) print sleep 2 done. USBdev.close() print Device closed. #*** And this is output. (received length is as expected 1'st frame is 1 as this indicated overrun in my device and other's are actual packets) sleep 1 done. sleep 2 done. Just received1 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Just received 2870 Bytes Device closed. -- (program exited with code: 0) Press return to continue -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071iu=/4140/ostg.clktrk ___ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
Re: [pyusb-users] libusb1 Callback thread
On 30. 07. 2014 11:52, Xiaofan Chen wrote: On Wed, Jul 30, 2014 at 2:45 PM, Slavko Kocjancic esla...@gmail.com wrote: Hello... I try to do some async transfer. The program bellow actualy 'near' work. It setup 10 transfers and should print the received bytes in callback. The problem is that callback is not done at receive complete! In example below I expect callback while sleep comand is executed but instead got all callbacks when I close device... I know that USBPoller/USBPollerThread has something to do with my problem but don't know how to use it. Here is my test program: #*** import usb1,time def openUsb(vid,pid,name): context = usb1.USBContext() for dev in context.getDeviceList(skip_on_error=True): if (dev.getVendorID()==vid) (dev.getProductID()==pid): if dev.getProduct()==name: return dev.open() It seems to me that you are not using pyusb, but rather python-libusb1. https://github.com/vpelletier/python-libusb1/blob/master/testUSB1.py I am not so sure if people in this list are working with python-libusb1 or not. Yes it is python-libusb1 as libusb doesn't handle async transfer at all. -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071iu=/4140/ostg.clktrk ___ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
Re: [pyusb-users] Asynchronous transfers
On 29. 07. 2014 18:51, Wander Lairson Costa wrote: Unfortunately, PyUSB doesn't have async support yet :( Ouch... So what can be done? Direct acess to lubusb? Is it possible to make callback in python?!? Or another library in c is way to go?!? any hint? For PyUSB there is nothing to be done on short term, but you can try [1]. It is a thin Python wrapper around libusb 1.0. [1] https://github.com/vpelletier/python-libusb1 Best Regards, Wander Lairson Costa Ok I managed somehow to work in linux but now I stuck as I can't manage ro run in windows. I know that I use python-libusb1 https://github.com/vpelletier/python-libusb1 and this should work with libusb1.0 (but not libusb-win32). But I don't know how to test if this is libusb or libusb-win as both dll have same name? And seems that I use wrong dll (btw it's near impossible to find precompiled libusb-1.0.dll to be not libusb-win32 type??) Does someone have links to working solution? (ie python wrapper to libusb and correct libusb, to be able to work in linux and win with async support?) Thanks. -- Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071iu=/4140/ostg.clktrk ___ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
Re: [pyusb-users] Trouble specifying a backend on embedded.
2014-07-30 15:01 GMT-03:00 Samuel Thurston samuel-thurs...@uiowa.edu:
Hello all,
I'm trying to use pyusb on an embedded yocto linux running on an intel
Galileo board. I'm running into problems trying to load the custom
backend as specified in the tutorial page. Since there is no compile
environment I'm missing ldconfig. When I go to get a handle to the
device the normal way I get this error:
dev = usb.core.find(idVendor = vid, idProduct = pid)
Traceback (most recent call last):
File stdin, line 1, in module
File /usr/lib/python2.7/site-packages/usb/core.py, line 864, in find
raise ValueError('No backend available')
ValueError: No backend available
I located the library to link at /lib/libusb-1.0.so.0
so I tried to use the method described to specify a find_library function.
backend = usb.backend.libusb1.get_backend(find_library=lambda x:
/lib/libusb-1.0.so.0)
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: get_backend() takes no arguments (1 given)
I don't really understand the mechanism at play here, so I don't have
any ideas for next steps. If anyone can provide some guidance I'd be
very grateful.
for what it's worth, here's the DATA section from help(usb)
DATA
__all__ = ['legacy', 'core', 'backend', 'util']
__author__ = 'Wander Lairson Costa'
__version__ = '1.0.0b1'
Hmm, unfortunately this feature is not available on any tagged version
yet. Could you please test with [1] ?
[1] https://github.com/walac/pyusb/tarball/master
--
Best Regards,
Wander Lairson Costa
--
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