On Thu, 25 Apr 2013, victor yeo wrote: > For bulk out endpoint, I code the kagen2_ep_queue() to read the > packets from the USB hardware, then call bulk_out_complete() via > req->req.complete. Is this the correct way? While kagen2_ep_queue() is running, there shouldn't be any packets in the USB hardware. The hardware should refuse to accept any packets, sending NAKs back to the host, until a request has been submitted and queued. > Or i should only read the bulk out endpoint when bulk-out endpoint > interrupt is received? When the request is queued, that's when you should tell the hardware to accept data from the host. After that, each time a packet arrives from the host, either the hardware or the UDC driver should store the packet data in the request's buffer. When the buffer is full or a short packet is received (the UDC driver's interrupt handler will know when this happens) then the UDC driver should call req.complete. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
