Re: [Linux-usb-users] Newbe

[Roger Hosto]

The buffer is only 5 bytes. I think the problem is, that it is not always receiving data. It just receives data when someone sends a signal, but I need to be constantly reading the device for when they do send a signal. That's my problem I not sure if I am going about this read function the best way. I am kind of guessing. 8)

Johannes Erdfelt wrote:

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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