It would make things easier if you configure your email client to wrap
lines after 72 columns or so.
On Wed, 23 Jun 2010, Viral Mehta 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.
>
> 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.
Have you used usbmon to check the data being sent?
> 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. ??
I doubt it; more likely it's a bug in your program. But I can't tell
where unless you post the code in more detail.
Alan Stern
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