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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