2012/2/10 Lance R. Vick <la...@lrvick.net>: > Good call on checking the interfaces more carefully. It turns out interface > 0 is not being used at all and I updated the c accordingly. > > For clarity I simplified and combined all the c into one file. I verified it > compiles and that the binary dumps temperature from my device properly after > multiple disconnects/reconnects: > > http://pastie.org/3354572 > > > From learning that only interface 1 is used I updated the python as follows: > > ------------------ > > import usb.core > > dev = usb.core.find(idVendor=0x0c45,idProduct=0x7401) > > if dev.is_kernel_driver_active(1): > dev.detach_kernel_driver(1) > > dev.set_configuration() > > request = ''.join([chr(x) for x in > [0x01,0x80,0x33,0x01,0x00,0x00,0x00,0x00]]) > > dev.ctrl_transfer(0x21,9,0x200,0x1,request,8) > > ret = dev.read(0x82,8,1,500) > > print(ret) > > ------------------ > > I now get a Resource Busy error: > > ------------------ > > > Traceback (most recent call last): > File "temper1.py", line 9, in <module> > dev.set_configuration() > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/core.py", > line 530, in set_configuration > self._ctx.managed_set_configuration(self, configuration) > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/core.py", > line 92, in managed_set_configuration > self.backend.set_configuration(self.handle, cfg.bConfigurationValue) > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/_debug.py", > line 52, in do_trace > return f(*args, **named_args) > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/backend/libusb10.py", > line 455, in set_configuration > _check(_lib.libusb_set_configuration(dev_handle, config_value)) > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/backend/libusb10.py", > line 357, in _check > raise USBError(_str_error[retval.value]) > usb.core.USBError: Resource busy > > ------------------- >
Altough you are not using interface 0, you should detach it in order to the kernel driver to get unloaded. -- Best Regards, Wander Lairson Costa ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
