Re: [Libusb-win32-devel] Return values

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

What kind of error messages does DebugView 
(http://www.microsoft.com/technet/sysinternals/utilities/debugview.mspx)
capture when you try to configure your devices?

Also, it would be helpfull if you would post your device's descriptors (output
of testlibusb-win.exe).

Stephan


> 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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