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

[Stephan M. <Ste...@ia...>]

Try to replace:

uci = usb_claim_interface (udev, 0);

with

usb_set_configuation(udev, 1);
uci = usb_claim_interface (udev, 0);

It should work then.


Stephan




> Help, please.  I've started writing a programme to use libusb-win32, but
> I'm getting an error right at the start.
> 
> First, some background.  I've used libusb under Linux (Fedora Core 5)
> successfully, to write driver functions for the first USB device that I
> wrote firmware for.  That device works entirely happily 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 device also
> works entirely happily under RISC OS.  I thought I'd try this Windows
> thing, but I'm having no success.
> 
> The entire programme is here:
> 
> // Can I get this system to do what I want?
> #include <usb.h>
> #include <stdio.h>
> 
> #define VENDOR_ID_NICE 0x16A8
> #define PRODUCT_ID_CONTACT_CLOSURE 0x0004
> 
> int init (void)
> {
>    //int usb_busses;
>    struct usb_bus* bus;
>    struct usb_device* dev;
>    usb_dev_handle *udev;
>    int retval = -1;
>    int uci;
>    int done = 0;
> 
>    printf ("Hello\n");
> 
>    usb_init ();
>    usb_find_busses ();
>    usb_find_devices ();
>    for (bus = usb_get_busses (); bus; bus = bus->next)
>    {
>       for (dev = bus->devices; dev && (done == 0); dev =
> dev->next)
>       {
>          udev = usb_open (dev);
>          printf ("udev = %p\n", udev);
>          if ((dev->descriptor.idVendor == VENDOR_ID_NICE)
>           && (dev->descriptor.idProduct ==
> PRODUCT_ID_CONTACT_CLOSURE))
>          {
>             printf ("Found it!\n");
>             uci = usb_claim_interface (udev, 0);
>             printf ("Return value from
> usb_claim_interface: %d\n", uci);
>             retval = uci;
>             done = 1;
>          }
>          else
>          {
>             printf ("Not ours, VID = %04X, PID =
> %04X\n", dev->descriptor.idVendor, dev->descriptor.idProduct);
>             usb_close (udev);
>             printf ("Closed: %p\n", udev);
>          }
>       }
>    }
>    return retval;
> }
> 
> int main (void)
> {
>    int init_result;
> 
>    init_result = init ();
>    if (init_result == 0)
>    {
>       printf ("Starting...\n");
>    }
>    else
>    {
>       printf ("Failed\n");
>    }
> }
> 
> When I run it, I get a couple of "Not ours, VID = " etc. messages for
> other USB items I have, followed by "Found it!"  But then "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.  My device
> only has interface 0.  It's a very simple device, with a vendor-specific
> protocol, specified at interface level.
> 
> Can anyone see what I'm doing wrong, please?
> 
> libusb-win32 downloaded from the main libusb-win32 site this week.  No
> previous copy on this computer.  Windows XP.
> 
> Dave
> 
> 
> 
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