Jean Tourrilhes wrote:
>
> Rob Lockhart wrote :
> > Hi Jean
> >
> > The definitive Ultra spec is part of IrMC, not IrWW. The IrWW version is
> > specific to Shimokura-san's watches.
>
> Ok. I guess those are not really that different anyway...
>
The nice difference is that IrWW are .doc files that I can't read and
IrMC are pdfs.
> > Speaking as one of the authors, though, please don't base a new
> > implementation on Ultra unless it's specifically to talk to watches. Ultra
> > was a solution to a problem that didn't really exist, we just didn't know
> > it. At the time, we hadn't been exposed to IrDA Lite's ability to cut the
> > main stack down to really small model device sized byte counts. (Ultra
> > predates Dave Suvak's IrDA Lite by two meetings.) If we had, we'd've never
> > written Ultra.
>
> Speaking as the guy who pushed Ultra in the Linux-IrDA stack,
> I beg to disagree. We are using intensively Ultra in our CoolTown
> setup and we will continue to do so.
> Our microcontroler is so dumb, slow and cheap (actually
> cheaper than the Ir transceiver itself) that it would really not be
> able to do IrDA lite, so for us Ultra is the only way to go.
> Other added benefits :
> o Ultra is *vastly* more robust than normal IrDA. We have
> many, many cases when normal IrDA doesn't work because of cheap
> tranceiver and fluorescent light, but we never found a single case
> where Ultra would not work.
> o Ultra is way faster. Normal IrDA has horrible latency for
> connection setup.
> o Ultra is much more power efficient. In fact, if we could do
> Ultra at 115 kb/s, we could save even more power...
> o Ultra is simpler to implement. Enough bugs in our code...
>
> To conclude, we are really pleased with Ultra, and no way we
> would go to IrDA Lite. In fact, for our applications, I can't see a
> single benefit of using IrDA Lite over Ultra (I'm lying, the benefit
> would be compatibility with various IrDA stacks that don't support
> Ultra). In fact, we are planning to move to Obex over Ultra soon...
Could you keep me posted on your progress with that? I'll happily do
likewise.
Garst
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