Re: [Libusb-win32-devel] Cannot retrieve configuration descriptor

[Winge M. <mic...@fr...>]

Hi Dan,
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I do not have problem with the usb_get_descriptor command. This works =
find. I have a problem that the driver cannot access the configuration =
of my device with the  "config" pointer in "struct usb_device". The =
"config" pointer is always zero. I guess this pointer will be assigned =
during the call of usb_get_busses(). The problem I think is somewhere =
there.
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My call of usb_get_descriptor is
usb_get_descriptor(JM128MMT_devh,2,1,Buff,25);
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Micha

Best regards/Mit freundlichen Gr=FCssen

Michael Winge

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________________________________

From: lib...@li... =
[mailto:lib...@li...] On Behalf Of =
Dan Ellis
Sent: 24 January 2008 16:09
To: lib...@li...
Subject: Re: [Libusb-win32-devel] Cannot retrieve configuration =
descriptor


What is the syntax of the usb_get_descriptor command you are using? What =
is the index of the configuration, and what is the bValue in the =
configuration when you retrieve it? There was a bug in libusb around how =
these values were used which was fixed sometime over a year ago.

Dan.

Winge Michael wrote:=20

	I still face the same problem which I have mention in the email with =
the subject " Problem with libusb driver version 0.1.12.1" to the =
lib...@li... email list.
	=20
	I installed my device driver (*.inf) and test my driver with =
TestLibUsb. TestLibUsb displays idVendor and idProduct. That means to me =
that the device is working since driver has access to the device =
descriptor. The problem is that the driver cannot retrieve the =
configuration of my device.
	During debugging my application I found out that "config" pointer in =
"struct usb_device" is 0.
	=20
	I changed my window application so that I try to get the configuration =
with the libusb API "usb_get_descriptor" and it works. I get the =
configuration interface and endpoint descriptors.
	=20
	What could be the reason why libusb driver assign 0 to the "config" =
pointer in "struct usb_device"?
	=20
	Thank you for your help!
	=20
	Micha
	=20

	Best regards/Mit freundlichen Gr=FCssen

	Michael Winge
=09
	MSG EMEA General Applications

	Tel:       +44(0)1355355547
	Mobile:  +44(0)7834020228
	Email:    mic...@fr... =
<mailto:mic...@fr...>=20
=09
	Registered address:
	Freescale Semiconductor UK Ltd
	Colvilles Road
	East Kilbride
	Glasgow
	Scotland
	G75 OTG

	Registration number: SC262720
	VAT number: GB831329053
=09
	This mail is classified:
	Freescale Confidential Proprietary ( )
	Freescale Internal Use Only        (X)
	General Business Information      ( )=20

	=20