Ahhhh, OK, I see. No idea that's how it worked. I did look at the
docs, but did not pick up on this....
Thx.
Chris.
Paul Alfille wrote:
> OW::get('/uncached');
>
> On Feb 19, 2008 3:01 PM, Chris Maresca <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Hmm, that's a good question. My init line is as follows:
>
> OW::init("$port --timeout_directory=1 --timeout_presence=1
> --timeout_volatile=1 --timeout_stable=1");
>
> Should I add other flags? Sorry, I don't understand how the caching
> works, I thought that setting the above timeouts to 1 would
> effectively
> stop caching...
>
> Thx.
>
> Chris.
>
> Paul Alfille wrote:
> > uncached?
> >
> > On Feb 19, 2008 2:29 PM, Chris Maresca <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>
> > <mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>> wrote:
> >
> > I wrote the code in Perl. Basically, it's a giant while()
> statement
> > that calls OW::get twice each loop. Each time OW::get is
> called, it
> > stuffs the list of whatever gets returned into an array,
> then compares
> > the two arrays for differences. If there is a difference, it
> > prints out
> > the device ID.
> >
> > It works, but not very reliably. I found I had to insert a
> sleep
> > statement (for 1 second) or it would not pickup new devices.
> I'm now
> > thinking that perhaps I should only do the baseline scan
> every 10
> > loops
> > or something.
> >
> > Chris.
> >
> > Paul Alfille wrote:
> > > In my tests, OWFS can read and respond in < 0.1 second.
> > >
> > > There are some tricks for fast operation:
> > > 1. Segment the 1-wire bus with separate a BUSMASTER for
> the chips
> > > being polled.
> > > 2. Don't use a DS2409
> > > 3. Make sure your script doesn't have process start-up
> delays in
> > the loop.
> > >
> > > What language are you planning to ue?
> > >
> > > Paul Alfille
> > >
> > > On Feb 19, 2008 2:12 AM, Chris Maresca
> > >
> > > Why is it that you think a PC couldn't handle this? I've
> > built CNC
> > > machines with tolerances in the thousandths of an inch
> using
> > real-time
> > > Linux, talking to a 1wire bus is trivial by comparison....
> > >
> > >
> > >
> >
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