[Libusb-devel] Re: ETIMEDOUT, but command seems to succeed

[Charles L. <cl...@gm...>]

On 7/12/05, Sandro Weiser <san...@gm...> wrote:
> >> int ret =3D usb_control_msg(udh, USB_DT_HID, USB_REQ_SET_REPORT, 0x020=
0,
> >> 0x01, data, 8, shvfdTimeout);
> >
> > Are you sure that these are the exact values the display is expecting?
> not really, but if they were wrong -- the display wouldn't response, woul=
d it?

Well, it's hard to tell without knowing more about the device. But I
would not be surprised if the firmware is accepting the message, then
temporarily hanging until a few milliseconds go by.

Can you compare the values you are sending to the values that a
Windows program would send to the device?

Also, what if you change "USB_DT_HID" to "USB_TYPE_CLASS |
USB_RECIP_INTERFACE", as Stephan suggested? (IIRC, USB_DT_HID is
00001001, not 00100001.)

--=20
- Charles Lepple