Re: [Libusb-win32-devel] Return values

[Dan M. <dan...@gm...>]

Hi Stephan,

1- I tried to find the error definitions before posting, and in errno.h I
get this only:


#ifndef __ERROR_H__
#define __ERROR_H__

/* Connection timed out */
#define ETIMEDOUT 116

typedef enum {
  USB_ERROR_TYPE_NONE = 0,
  USB_ERROR_TYPE_STRING,
  USB_ERROR_TYPE_ERRNO,
} usb_error_type_t;


void usb_error(char *format, ...);
void usb_message(char *format, ...);
const char *usb_win_error_to_string(void);
int usb_win_error_to_errno(void);

#endif /* _ERROR_H_ */
2- There's no value named bMaxPower, but there is a MaxPower value, which is
50.

3- The devices are bus-powered.

4- I don't know if the endpoints have these characteristics, but I can
interrupt write and read, so I guess the device has interrupt endpoints.
About being isochronous, I can't really assure it is. It might be, as it is
a 2.0 device.

When I put three of these devices, I get this error, but if I put two
devices and another bus-powered device, such as a pen-drive, it works fine.

But if the problem is really windows refusing to configure the device, is
there a way to make the SO not refuse it?

Thanks for the answers Stephan!

Cheers!

Dan


On 4/10/07, Stephan Meyer <ste...@we...> wrote:
>
>
>
> > Hi there,
> >
> >
> >
> > Is there a table of the function's return values?
>
> The error code are defined in errno.h. -5 means EIO (i/o error)
>
> >
> >
> >
> > I'm using a test board that has four devices with the same
> characteristics, such as vendor and product
> > ids, number of and address of endpoints, and all others. But when I try
> to use more than two of these
> > devices, I get a -5 error from the function usb_set_configuration() on
> the third device (after accessing
> > writing and reading from the other two).
>
> This could be either a power or bandwidth problem. Windows will refuse to
> configure
> the devices of they request too much power or bandwidth.
>
> What's the bMaxPower value of your device's config descriptor? Are your
> four
> devices connected to a bus-powered or to a self-powered hub?
>
> Do your devices have interrupt or isochronous endpoints?
>
> Stephan
>
>
>
> >
> >
> >
> > Does anyone know what might be happening? Thanks in advance.
> >
> >
> >
> > Dan Leite Martins
> >
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