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])
>>
>
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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'
>
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: []
3. So where am I missing.
- Did I installed files correctly ??
- Do I need to install python-usb from *synaptic* or not ?
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<http://wiki.erazor-zone.de/wiki:projects:python:pyusb:setup:examples:usbenum>and
it says written by Wander
Lairson Costa
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
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