The problem seems to be solved. Apparently, the change configuration
command could be accepted only when the device is in reset state. The
on-chip bootloader specifies that.
Thanks for your help.
On Thu, Jul 12, 2012 at 6:14 PM, Xiaofan Chen <xiaof...@gmail.com> wrote:
> On Thu, Jul 12, 2012 at 6:34 PM, Debapratim Ghosh
> <deba21pra...@gmail.com> wrote:
> > 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.
>
>
> So the device has three configurations (1, 2, 3), which
> one you want to use? The first configuration has an interface
> without any endpoints, so only control transfer can be used.
>
>
> --
> Xiaofan
>
>
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> _______________________________________________
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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
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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