2012/1/26 bibek chitrakar <bibek.chitra...@gmail.com>: > Hello Wander, > > Now I am very much confused about everythin going on with Pyusb. > 1. First with installation. > I installed ----> libusb-1.-00 from synaptic > > > 'http://sourceforge.net/projects/pyusb/files/latest/download' > got the pyusb files, unzipped and installed as > $ sudo python setup.py install > >> The following code works. >> ========================================================= >>> >>> import usb.core >>> import usb.util >>> >>> # find our device >>> dev = usb.core.find(idVendor=0x0dd4, idProduct=0x01a8) >>> >>> # was it found? >>> if dev is None: >>> raise ValueError('Device not found') >>> >>> # set the active configuration. With no arguments, the first >>> # configuration will be the active one >>> dev.set_configuration() >>> >>> # get an endpoint instance >>> cfg = dev.get_active_configuration() >>> interface_number = cfg[(0,0)].bInterfaceNumber >>> alternate_setting = usb.control.get_interface(dev,interface_number) >>> intf = usb.util.find_descriptor(cfg, bInterfaceNumber = interface_number, >>> bAlternateSetting = alternate_setting >>> ) >>> >>> ep = usb.util.find_descriptor( >>> intf, >>> # match the first OUT endpoint >>> custom_match = \ >>> lambda e: \ >>> usb.util.endpoint_direction(e.bEndpointAddress) == \ >>> usb.util.ENDPOINT_OUT >>> ) >>> >>> assert ep is not None >>> >>> # write the data >>> print ep.write('\x10') >>> print ep.read(1,0) >> >> >> ========================================================= >> Output is: >> >>> $ sudo python hardware_monitor_printer.py >>> bytes written: 1 >>> bytes read: array('B', [0]) > >
Here you are using PyUSB 1.0, which read and write function automatically detect the endpoint type, so it is expected to work > @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ > @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ > > Then I tried my original code. > ========================================================= > >> #!/usr/bin/python >> >> >> import usb >> import time >> >> class HardwareMonitor_printer(object): >> def __init__(self, vendor_id, product_id): >> self.device_found = False # True if device found >> busses = usb.busses() # enumerate busses >> self.handle = None >> for bus in busses: >> devices = bus.devices >> >> for dev in devices: >> if dev.idVendor == vendor_id and dev.idProduct == >> product_id: # device matches >> self.dev = dev >> self.conf = self.dev.configurations[0] >> self.intf = self.conf.interfaces[0][0] >> self.endpoints = [] >> for endpoint in self.intf.endpoints: >> >> self.endpoints.append(endpoint) >> self.device_found = True >> return >> >> def open(self): >> if self.handle: >> self.handle = None >> try: >> self.handle = self.dev.open() >> if self.handle.is_kernel_driver_active(self.intf): >> try: >> self.handle.detach_kernel_driver(self.intf) >> except Exception as e: >> print "ERROR: Could not detach device from kernel:", e >> else: >> self.handle.claimInterface(self.intf) >> self.handle.setConfiguration(self.conf) >> self.handle.setAltInterface(self.intf) >> return True >> except: >> return False >> >> def write(self, ep , buff, timeout=100): >> try: >> return self.handle.interruptWrite(ep, buff, timeout) #return >> bytes written >> except usb.USBError as e: >> print e >> return 0 >> >> def read(self, ep, size, timeout=100): >> try: >> return self.handle.interruptRead(ep, size, timeout) # return >> data read >> except: >> return [] >> >> def getDeviceName(self): >> try: >> for i in range (1, 4): >> print self.handle.getString(i,25) >> except IOError as e: >> print e >> >> def endpoint(self): >> return self.endpoints >> >> if __name__ == '__main__': >> printer = HardwareMonitor_printer(0xdd4,0x1a8) >> if printer.device_found: >> printer.open() >> print 'endpoints: ', (printer.endpoints) >> printer.getDeviceName() >> try: >> bytes_written = printer.write(1, [0x10], 100) >> print 'bytes written: ', bytes_written >> except usb.USBError, e: >> print e >> bytes_read = printer.read(0x81, 64) >> print 'bytes read: ', bytes_read >> >> else: >> print 'device not found!!!' > > > ========================================================= > It gives the device info but also errors. > >> $ sudo python hardware_monitor_printer.py >> endpoints: [<usb.legacy.Endpoint object at 0x8b46f2c>, >> <usb.legacy.Endpoint object at 0x8b46eac>] >> >> CUSTOM Engineering S.p.A. >> TG2480-H >> Self Power Mode >> Traceback (most recent call last): >> File "hardware_monitor_printer.py", line 122, in <module> >> bytes_written = printer.write(1, [0x10], 100) >> File "hardware_monitor_printer.py", line 94, in write >> >> return self.handle.interruptWrite(ep, buff, timeout) #return bytes >> written >> File "/usr/local/lib/python2.6/dist-packages/usb/legacy.py", line 171, >> in interruptWrite >> return self.dev.write(endpoint, buffer, self.__claimed_interface, >> timeout) >> File "/usr/local/lib/python2.6/dist-packages/usb/core.py", line 613, in >> write >> fn = fn_map[self._ctx.get_endpoint_type(self, endpoint, intf)] >> File "/usr/local/lib/python2.6/dist-packages/usb/core.py", line 183, in >> get_endpoint_type >> etype = util.endpoint_type(e.bmAttributes) >> AttributeError: 'NoneType' object has no attribute 'bmAttributes' > > Here you are using PyUSB 0.4, try to replace interruptWrite/interruptRead by bulkWrite/bulkRead. > > 2. Now if I install python-usb from synaptic. > It only gives error like this with my original code( the code with > 'import usb'...) > >> $ sudo python hardware_monitor_printer.py >> endpoints: [<usb.Endpoint object at 0xb7805090>, <usb.Endpoint object at >> 0xb7805080>] >> >> CUSTOM Engineering S.p.A. >> TG2480-H >> Self Power Mode >> error submitting URB: No such file or directory >> bytes written: 0 >> bytes read: [] > This is still the wrong endpoint type problem, I guess. > > 3. So where am I missing. > > Did I installed files correctly ?? > Do I need to install python-usb from synaptic or not ? > I think you are doing interrupt transfers when you should use bulk transfers, as I said earlier. > 4. This is my device info. >> >> Device: 004 >> Device class: 0 >> Device sub class: 0 >> Device protocol: 0 >> Max packet size: 64 >> idVendor: 3540 >> idProduct: 424 >> Device Version: 01.19 >> Configuration: 1 >> Total length: 32 >> selfPowered: 1 >> remoteWakeup: 0 >> maxPower: 4 >> Interface: 0 >> Alternate Setting: 0 >> Interface class: 7 >> Interface sub class: 1 >> Interface protocol: 2 >> Endpoint: 0x81L >> Type: 2 >> Max packet size: 64 >> Interval: 0 >> Endpoint: 0x2L >> Type: 2 >> Max packet size: 64 >> Interval: 0 > > Got this info through usbenum.py and it says written by Wander Lairson Costa Again, endpoint type is 2, which means bulk. > > 5. Since I have my device info, endpoint info(above), why cant I write into > my device. > If the parameters for write(self, ep , buff, timeout=100) is wrong > Please somebody find a way out to work this code. > > If I lag any information please feel free to ask for any information. > > Regards, > Bibek Chitrakar > > > > -- Best Regards, Wander Lairson Costa ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
