On 2012-05-23 12:26, Peter Pastor wrote:
> Hey there !
> 
> My question is, does such a thing (real-time usb over rtnet) exist ?
> Can I use a dedicated (of the shelf) usb-to-ip converter and talk to
> it using RTNet in real-time ?

You can in theory, but I would be surprised if any of them is designed
to provide deterministic behaviour. It will be a black box in your
control loop, hopefully working, but possibly delaying things once in a
while, e.g. to scan for new USB devices or whatever.

The next step would then be to evaluate if the existing RT-TCP support
of RTnet will be sufficient for driving a particular box. We do not
implement all details, nor did we test a broad range of setups. However,
that part might then be easier fixable.

> What are the requirements that I would have to look out for other than
> UDP support ? I would need to read some sensors in real-time over usb
> that have a "virtual COM port" interface.
> What other options do I have. Unfortunately, there is no working
> real-time usb 2.0 stack available.
> 
> You help is very much appreciated.
> 
>  peter

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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