Hi, the lsusb -v dump of my device shows the following
Bus 005 Device 006: ID 04d8:feaa Microchip Technology, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 255
bMaxPacketSize0 8
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0xfeaa
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 3
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 18
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 4
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 2
iConfiguration 5
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 5
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 3
iConfiguration 4
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 6
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x000a
(Bus Powered)
Remote Wakeup Enabled
Lemme know if this helps.
DG
On Thu, Jul 12, 2012 at 2:11 AM, Tormod Volden <lists.tor...@gmail.com>wrote:
> On Wed, Jul 11, 2012 at 8:03 PM, Debapratim Ghosh
> <deba21pra...@gmail.com> wrote:
> > I am working with python in Ubuntu 11.10. I'm able to detect a USB
> device,
> > access its properties etc. Now I want to establish USB communication. As
> > given in the pyusb tutorial webpage, I gave a command
> >
> > pingu = usb.core.find(idVendor = 0x04D8, idProduct = 0xFEAA) #this is
> > working fine now, and then....
> >
> > pingu.set_configuration() #this gives the following error
> >
> > Traceback (most recent call last):
> > File "testui1007.py", line 78, in startHandler
> > pingu.set_configuration()
> > File "/usr/local/lib/python2.7/
> > dist-packages/usb/core.py", line 547, in set_configuration
> > self._ctx.managed_set_configuration(self, configuration)
> > File "/usr/local/lib/python2.7/dist-packages/usb/core.py", line 92, in
> > managed_set_configuration
> > self.backend.set_configuration(self.handle, cfg.bConfigurationValue)
> > File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb10.py",
> > line 503, in set_configuration
> > _check(_lib.libusb_set_configuration(dev_handle, config_value))
>
> I wonder what config_value is at this point. You can always add a
> little "print" in the above libusb10.py file to see. If the device was
> already configured and is reconfigured with the same value, it will
> typically perform a reset*. This might give an unknown error. Just a
> guess.
>
> Maybe you can give more information on the version of your pyusb and
> libusb-1.0, and even a lsusb -v dump of your device?
>
> Regards,
> Tormod
>
>
> *) See http://libusb.sourceforge.net/api-1.0/caveats.html
>
> > File "/usr/local/lib/python2.7/dist-packages/usb/backend/libusb10.py",
> > line 403, in _check
> > raise USBError(_str_error[ret], ret, _libusb_errno[ret])
> > usb.core.USBError: [Errno None] Unknown error
> >
> > I am logged in as root, so authentication cannot be an issue right?
> >
> > Please give some idea why this is happening? I tried making a debug log
> > file, but the log file doesn't get created.
> >
> >
> > --
> > Regards,
> >
> > Debapratim Ghosh
> > IIT Bombay
>
>
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--
Regards,
Debapratim Ghosh
IIT Bombay
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Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
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