Messages in this thread | | | Date | Sat, 14 Apr 2007 09:58:52 -0700 | From | Pete Zaitcev <> | Subject | Re: [PATCH] usb bulk transfer: 1024 byte packets |
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On Sat, 14 Apr 2007 09:14:25 -0400 (EDT), "Jeremy C. Andrus" <jeremy@jeremya.com> wrote: > On Fri, April 13, 2007 22:16, Pete Zaitcev wrote:
> > The transfer size in the URB is not limited by the maximum packet > > size. The HC driver splits up the transfer as specified by URB into > > the required number of packets. > > The problem was not in the transfer from PC -> Device, but from Device > -> PC. If I remember correctly, the 512 limit (in the > urb->transfer_flags) is used to setup the DMA. When the device sent > packets which were 1024 bytes in size, the urb came back with a status > set to -EOVERFLOW.
It's a bug in your driver. Supply the correct size with the URB and all will be fine. Like I said, HC splits up the transfer transparently, no matter what direction.
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