How big is the buffer you're reading?
Are you sure there is data to be read from the device?
Can you try HZ * 4 (or larger)?
JE
On Tue, Dec 03, 2002, Roger Hosto <[EMAIL PROTECTED]> wrote:
> Okay I add in HZ*2 it decreased the number of error messages, but I am
> still getting.
> kernel: usb_control/bulk_msg: timeout
>
> Thanks,
> Roger Hosto.
>
> Johannes Erdfelt wrote:
>
> >On Tue, Dec 03, 2002, Roger Hosto <[EMAIL PROTECTED]> wrote:
> >
> >
> >>Okay I am a novice in hardware programming, but I have always heard and
> >>readed that if there is something you want in linux and no one else has
> >>done it try it yourself. So I did.
> >>
> >>Here is my problem. I am writing a usb driver for x10 cm19a usb Wireless
> >>Transceiver. It is a simple device that tranmits and receive X10
> >>protocols. I have got everything working accept I have a problem with
> >>the read control.
> >>Here is what I have tried.
> >>
> >>
> >> /* do an immediate bulk read to get data from the device*/
> >> retval = usb_bulk_msg (dev->udev,
> >> usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
> >> dev->bulk_in_buffer,
> >> dev->bulk_in_size,
> >> &count,
> >> dev->bulk_in_bInterval*2);//increased by a factor of
> >>2 to improve data received
> >>
> >>This works fine, but I receive the following error
> >>kernel: usb_control/bulk_msg: timeout
> >>
> >>So I tried the following to get rid of the error. which works but it
> >>jacks my Processor up to 100%.
> >>
> >> /* check and make sure that read hasn't been submit yet*/
> >> if(dev->read_urb->status == 0 ||
> >> dev->read_urb->status == -ENOENT)
> >> {
> >> usb_fill_int_urb(dev->read_urb,
> >> dev->udev,
> >> usb_rcvbulkpipe(dev->udev,dev->bulk_in_endpointAddr),
> >> dev->bulk_in_buffer,
> >> count,
> >> cm19a_read_bulk_callback,
> >> dev,
> >> dev->bulk_in_bInterval);
> >>
> >> retval = usb_submit_urb(dev->read_urb);
> >> }
> >>
> >>Any help would be cool.
> >>I am using Linux 2.4.18-3 #1 Thu Apr 18 07:32:41 EDT 2002 i686 unknown
> >>
> >>
> >
> >Don't use bInterval on a bulk pipe.
> >
> >Just use a fixed time, like HZ or HZ * 2 for the timeout.
> >
> >JE
> >
> >
> >
>
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