Re: [Libusb-win32-devel] Help, please

[Dave H. <DAV...@ni...>]

Wow, what a rapid reply!  Thanks.  I tried your fix, and it has got me
one step further.

(I note that usb_set_configuration (udev, 0) gives the same error -22 as
not calling it.  The only configuration I have is numbered 0; is this
OK?)

Setting configuration to 1 makes the call return 0, so it looks like
it's working, but it fails at the next step.  In the main loop, I do:

printf ("Starting...\n");
while (1)
{
  if (usb_interrupt_read (contact_closure_usb_dev,
      contact_closure_usb_input_endpoint,
      cBuf,
      4,
      0) > 0)
  {
    printf ("Got some\n");
  }
}

but the printf statement is never executed, although I am doing things
that should cause the interface to send messages - which are 4 bytes
each.

Any more ideas?

Dave

> -----Original Message-----
> From: lib...@li...=20
> [mailto:lib...@li...] On=20
> Behalf Of Stephan Meyer
> Sent: 2007 June 06 14:05
> To: lib...@li...
> Subject: Re: [Libusb-win32-devel] Help, please
>=20
> Try to replace:
>=20
> uci =3D usb_claim_interface (udev, 0);
>=20
> with
>=20
> usb_set_configuation(udev, 1);
> uci =3D usb_claim_interface (udev, 0);
>=20
> It should work then.
>=20
>=20
> Stephan
>=20
>=20
>=20
>=20
> > Help, please.  I've started writing a programme to use=20
> libusb-win32, but
> > I'm getting an error right at the start.
> >=20
> > First, some background.  I've used libusb under Linux=20
> (Fedora Core 5)
> > successfully, to write driver functions for the first USB=20
> device that I
> > wrote firmware for.  That device works entirely happily=20
> under FC5 and
> > under RISC O (yes, the Acorn/Pace/Castle one).  I have now written
> > firmware for a second device.  Perhaps unsurprisingly, this device's
> > firmware is very heavily based on the previous one.  This=20
> device also
> > works entirely happily under RISC OS.  I thought I'd try=20
> this Windows
> > thing, but I'm having no success.
> >=20
> > The entire programme is here:
> >=20
> > // Can I get this system to do what I want?
> > #include <usb.h>
> > #include <stdio.h>
> >=20
> > #define VENDOR_ID_NICE 0x16A8
> > #define PRODUCT_ID_CONTACT_CLOSURE 0x0004
> >=20
> > int init (void)
> > {
> >    //int usb_busses;
> >    struct usb_bus* bus;
> >    struct usb_device* dev;
> >    usb_dev_handle *udev;
> >    int retval =3D -1;
> >    int uci;
> >    int done =3D 0;
> >=20
> >    printf ("Hello\n");
> >=20
> >    usb_init ();
> >    usb_find_busses ();
> >    usb_find_devices ();
> >    for (bus =3D usb_get_busses (); bus; bus =3D bus->next)
> >    {
> >       for (dev =3D bus->devices; dev && (done =3D=3D 0); dev =3D
> > dev->next)
> >       {
> >          udev =3D usb_open (dev);
> >          printf ("udev =3D %p\n", udev);
> >          if ((dev->descriptor.idVendor =3D=3D VENDOR_ID_NICE)
> >           && (dev->descriptor.idProduct =3D=3D
> > PRODUCT_ID_CONTACT_CLOSURE))
> >          {
> >             printf ("Found it!\n");
> >             uci =3D usb_claim_interface (udev, 0);
> >             printf ("Return value from
> > usb_claim_interface: %d\n", uci);
> >             retval =3D uci;
> >             done =3D 1;
> >          }
> >          else
> >          {
> >             printf ("Not ours, VID =3D %04X, PID =3D
> > %04X\n", dev->descriptor.idVendor, dev->descriptor.idProduct);
> >             usb_close (udev);
> >             printf ("Closed: %p\n", udev);
> >          }
> >       }
> >    }
> >    return retval;
> > }
> >=20
> > int main (void)
> > {
> >    int init_result;
> >=20
> >    init_result =3D init ();
> >    if (init_result =3D=3D 0)
> >    {
> >       printf ("Starting...\n");
> >    }
> >    else
> >    {
> >       printf ("Failed\n");
> >    }
> > }
> >=20
> > When I run it, I get a couple of "Not ours, VID =3D " etc.=20
> messages for
> > other USB items I have, followed by "Found it!"  But then=20
> "Return value
> > from usb_claim_interface: -22" which I don't understand.  I think it
> > indicates an illegal parameter.  udev must be OK, I assume.=20
>  My device
> > only has interface 0.  It's a very simple device, with a=20
> vendor-specific
> > protocol, specified at interface level.
> >=20
> > Can anyone see what I'm doing wrong, please?
> >=20
> > libusb-win32 downloaded from the main libusb-win32 site=20
> this week.  No
> > previous copy on this computer.  Windows XP.
> >=20
> > Dave
> >=20
> >=20
> >=20
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