Re: [Libusb-win32-devel] =?iso-8859-15?q?SnoopyPro_Function_types=2C_?= =?iso-8859-15?q?usb=5Fcontrol=5Fmsg=28=29_arguments_=3F?=

[Stephan M. <ste...@we...>]

>=20
> I'm looking at some SnoopyPro output, and (not being terribly
> familiar with USB details), struggling to relate the information
> it displays with either the USB spec., or the libusb interface.
>=20
> An example transaction:
>=20
>    URB Header (length: 80)
>    SequenceNumber: 4
>    Function: 0019 (VENDOR=5FENDPOINT)

This is the URB function used by Microsoft's USB stack.  Just ignore it, y=
ou don't
need it.
>From ddk/usbdi.h: #define URB=5FFUNCTION=5FVENDOR=5FENDPOINT   0x0019

The packet you see is a CLEAR=5FFEATURE request (see USB spec, chapter 9).

>    PipeHandle: 00000000
>=20
>    SetupPacket:
>    0000: 00 01 00 00 01 00 00 00
>    bmRequestType: 00
>      DIR: Host-To-Device
>      TYPE: Standard
>      RECIPIENT: Device
>    bRequest: 01
>      CLEAR=5FFEATURE
>=20
>    No TransferBuffer
>=20
>=20
> Now things like bmRequestType and bRequest are explained directly
> in the USB spec., but I can't find any reference to a "Function" code 0x=
19
> called VENDOR=5FENDPOINT (or any similar functions, such
> as 0x00 SELECT=5FCONFIGURATION, 0x08 CONTROL=5FTRANSFER,
> 0x0b GET=5FDESCRIPTOR=5FFROM=5FDEVICE etc.), nor can I see how one
> would trigger such transactions using libusb.
>=20
> How would I create a VENDOR=5FENDPOINT transaction above =3F
>=20
> Can I do this with a call to usb=5Fcontrol=5Fmsg() =3F If so,
> how do I setup for function 0x19, as the arguments to
> usb=5Fcontrol=5Fmsg() seem to correspond to the bmRequestType
> and bRequest fields documented in the USB spec., and
> according to the above, have a value of 0x00 and 0x01,
> rather than something like 0x42 and 0x01, that might seem
> to be the right values for Vendor + Endpoint =3F How
> would 0x42 relate to function 0x19 =3F
>=20
> If not, what function call is appropriate =3F
>=20
> Any help in pointing me in the right direction would
> be much appreciated.
>=20
> thanks,
> 	Graeme Gill.
>=20
>=20
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