Alan Stern wrote:
On Mon, 28 Feb 2005, Stavros Markou wrote:
Hi,
I 've set the URB_ZERO_PACKET tranfer flag for the bulk out endpoint
(kernel version 2.6.8). I've tried to get a capture of the zero packet
transfer on the usb analyzer but I didn't see anything. Is this feature
working ?
It is in the uhci-hcd driver; you didn't say which host controller driver
you are using.
I am using a via usb host controller (rev82) and I am working currently
with a 802.11g usb 2.0 wlan device.
However you shoult notice that this flag will add an extra zero-length
packet to a bulk-out transfer if and only if the URB's transfer length is
0 and is divisible by the maxpacket size. If the transfer length is not
divisible by the maxpacket size then no extra zero-length packet will be
added.
In order to see that feature I 've issued ping to another network device
with sizes divisible to maxpacketsize . Unfortunately, I haven't seen a
zero - length packet using my usb analyzer.
Alan Stern
Stavros Markou.
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