I have missed this one, thanks!
Best Regards,
Ivan, PhD
On Tue, Mar 27, 2012 at 12:23 PM, Serg Oskin <[email protected]> wrote:
>
> > Thank you for your answers!
> >
> > The problem with selective search is that I don't know if the device is
> still on a bus or not, so polling on ordinary search is more reliable for
> hardware failure detection.
>
> I periodically scan the root directory and compare the result with the
> previous scan. This allows us to detect the disappearance of devices on the
> bus and the emergence of new ones.
>
> > Second, alarm is set for sensed values, not for latches, so it is
> possible to miss some very short event.
>
> Hmm..
> ------------------ man DS2406 ---------------------
> set_alarm
> read-write, unsigned integer (0-331)
> A number consisting of three digits XYZ, where:
>
> X
> channel selection
> 0 neither
> 1 A only
> 2 B only
> 3 A or B
> Y
> source selection
> 0 undefined
> >>> 1 latch <<<<
> 2 PIO
> 3 sensed
> Z
> polarity selection
> 0 low
> 1 high
> --------------------8<------------------------
>
> This will see an event that occurred between periods of polling.
>
>
> >
> > I know, 1-wire is not the fastest network on the Earth, but I'm trying
> my best :)
> >
> > PS.
> >
> > It seems it is not possible to set negative alarm values for DS18B20
> temperature sensors. Or it is a bug in owhttp interface?
> >
> >
> > Best Regards,
> >
> > Ivan, PhD
> >
> >
> >
> >
> > On Tue, Mar 27, 2012 at 12:13 AM, Serg Oskin <[email protected] <mailto:
> [email protected]>> wrote:
> >
> > Try to use the alarm-directory.
> >
> > # Setup
> > foreach 12.*
> > openeach
> > writevalue_to_set_alarm
> > closeeach
> > end foreach
> >
> > # Main loop
> > foreach uncached/alarm
> > openeach
> > readvalue
> > reset_alarm
> > closeeach
> > end loop
> >
> > --
> > Serg.
> >
> > > Greetings to all,
> > >
> > > I am implementing a system which need to poll sensors (mainly
> DS2406 and DS2408) nearly every second. Of course I use uncached values of
> sensors to get the most recent data. I have about 15-20 sensors to poll.
> > >
> > > I see three options:
> > >
> > > First:
> > > loop:
> > > openfile("12.XXXXXXXX/latch.A");
> > > readvalue;
> > > closefile;
> > > end loop.
> > >
> > > The most obvious one, but open/close file is rather costly
> operation.
> > >
> > > Second:
> > > openfile("12.XXXXXXXX/latch.A");
> > > loop:
> > > readvalue;
> > > goto_first_line;
> > > end loop;
> > > closefile;
> > >
> > > This is better, but is there some chance, that value will be
> cached somewhere inside OS?
> > >
> > > Third:
> > > give up on owfs and use owhttpd and make tcp connections to read
> files.
> > >
> > > I think this is a heaviest one, but crossplatform, so can be used
> on windows. Can owhttpd have about 20 concurrent connections in a second?
> > >
> > >
> > > What strategy to choose? Thank you for any help in advance.
> > >
> > >
> > > Best Regards,
> > >
> > > Ivan, PhD
> > >
> > >
> > >
> > >
> > >
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