2012/2/10 Lance R. Vick <la...@lrvick.net>: > Hello all. > > So I have some working c code for a temperature Temper1v1.1 usb temperature > sensor I recently bought: http://pastie.org/3354037 > > But I want to port this to using pure python via pyusb. > > Based on the working c code I came up with the following: >
I don't know why your c code is working, because you didn't claim the interfaces. > ------------ > > import usb.core > > dev = usb.core.find(idVendor=0x0c45,idProduct=0x7401) > > if dev.is_kernel_driver_active(0): > dev.detach_kernel_driver(0) > 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(0x82,8,0) > > print(ret) > > ------------ > > However, this fails with the following Traceback > > ------------ > > > Traceback (most recent call last): > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/core.py", > line 177, in get_endpoint_type > return self._ep_type_map[key] > KeyError: (130, 0, 0) > > During handling of the above exception, another exception occurred: > > Traceback (most recent call last): > File "temper1.py", line 15, in <module> > ret = dev.read(0x82,8,0) > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/core.py", > line 629, in read > fn = fn_map[self._ctx.get_endpoint_type(self, endpoint, intf)] > File > "/home/lrvick/.virtualenvs/temper1/lib/python3.2/site-packages/usb/core.py", > line 180, in get_endpoint_type > etype = util.endpoint_type(e.bmAttributes) > AttributeError: 'NoneType' object has no attribute 'bmAttributes' > > ------------ > > > Clearly I am doing something wrong but I have no idea what to try next. Any > ideas? > There is only one thing that I can imagine: endpoint 0x82 belongs to interface 1, not interface 0. Furthermore, can you can that the interface numbers are 0 and 1? It is often the case, but not a rule. -- 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
