Re: [Xenomai-help] How can I now when it will be next periodic task release point?

[Rodrigo Rosenfeld Rosas <lbocseg@domain.hid>]

Hannes Mayer escreveu:
> Ciao Rodrigo!
> ...
>
> Just trying to understand your problem:
> If you wanna capture a image every 300ms, the processing must not take
> longer than 300ms, otherwise you have some kind over overrun (?)
> So you capture an image, process it within 300ms and then capture
> the next one, right ?
The processing takes something like 20 ms, but I don't need to process 
at a higher rate than 300 ms...
>
> OK, wait a sec. I think I got it.
> I guess your problem is having both capturing and processing in one 
> loop ?
> Why not make 2 threads, one for capturing, and one for processing ?
Because I don't really need it... It is much simpler the way I'm 
doing... Let me explain better what happen... When I make a request to 
capture an image to the framegrabber, the process will start on the 
beggining of the next field. Each field takes about 17 ms to complete 
for a NTSC camera... I would not like to wait for the field end, so I 
want to request a frame 33 ms before next release point so that a new 
image will be already present for sure on next release point. I could do 
some better design for better precision but I really don't need it. The 
process is far too simple... I can do it right now. The question is that 
I would like a cleaner way to do it. I would like to make clear that I 
want to request a frame 33 ms before next release point...
> I may be totally wrong - just trying to understand and maybe help :-)
I think I've explained it better now, didn't I?
> Best regards,
> Hannes.
>
> PS.: Why do all replies go only to the sender ? This hasn't been that
> way in the (far) past, right ?
As far as I recall it was always like that, unfortunately. I also would 
like that the reply-to was to the list. Sometimes I forget to press the 
reply-to-all button on my e-mail client...

Thank you Hannes,
Best Regards

Rodrigo.


		
_______________________________________________________ 
Novidade no Yahoo! Mail: receba alertas de novas mensagens no seu celular. Registre seu aparelho agora! 
http://br.mobile.yahoo.com/mailalertas/