On Wed, Jun 23, 2010 at 7:24 PM, Viral Mehta
<Viral.Mehta@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> I am writing USB user space driver on Host side. It is not following any class but a vendor specific.
> It is doing Bulk IN and OUT transfers. Device side gadget driver is doing Bulk Write and Host is waiting for the data.
>
Why not try libusb ?
> Now, on the host side I am doing in the userspace,
> {
> For loop for 1024 times
> {...
> Fill urb struct
> urb->buffer_length = len;
>
> ioctl(h->desc, USBDEVFS_SUBMITURB, urb);
>
> ioctl(h->desc, USBDEVFS_REAPURB, &urb_reap);
> }
> }
>
> However, everytime I reaped URB, it gets the same data. For all 1024 times. And the data is the part (of length = urb->buffer_length) of first URB submitted from gadget side. All urb struct and buffers are maintained properly.
>
> Interestingly, if I change length (urb->buffer_length = len) such that it matches with what gadget side driver is sending (or doing urb_submit), I start getting proper data each time.
>
> Looks like a Bug somewhere in usbdevfs. ??
>
> Thanks,
> Viral Mehta
>
>
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