Re: [Owfs-developers] Hang, glitches and more

[Paul A. <pal...@ea...>]

On Wednesday 06 July 2005 05:42 pm, Krzysztof wrote:
> Hi!
> I like owfs software verrrry much, it is cool :-)
> But there is something wrong with owfs imho (or my system!? Please help me
> to sort it out)
>
> I use few ds1820 (20m long wires) - they are in parasite mode.
> And one ds2438 (2m) - powerd via USB adapter (not in parasite mode).
>
> And the problems are:
>
> 1)
> http://img221.imageshack.us/img221/7387/meteo21ib.png
> Annoying small glitches from time to time (here @ 12:00 and 4 hours later)
> They come from the ds18b20 sensors. How can I get rid of these?
>
> 2) DS2438
> That is a realy annoying :/ When I connect device 2438 to the 1w network it
> is not instantly visible in the /mnt/1wire (maybe that is how owfs works...
> dunno) and if it finaly appears I have sometimes problem with reading the
> data!!
>
To read immediate changes, look at the "uncached" directory. Since directory 
searches are expensive (slow) and unchanging in many installations, the 
directory contents are "cached". There is a timeout, but it isn't short. You 
can set the timeout "/settings/cache/directory" in seconds, or just read the 
"uncached" directory.

> #
> # cat /mnt/1wire/26.xxxxxxxxxx/current <enter>
>
> And I get proper reading OR _sometimes_ "cat: bad syntax", "cat: current is
> a directory" error.
> Sometimes directory 26.xxxx (ds2438 hw address) vanishes too :(
> "ls" does not see it, mc does not either and mc may report doubled
> direcotry of one DS18b20 sensor :-O !
>
> 01.A795AD0B0000/
> 10.9D3E83000800/
> 10.0EFE82000800/
> 10.0EFE82000800/  <--- doubled, ds2438 dir vanished howether ds2438 is
> still on the network!!
> bus.0/
> simultaneous/
> structure/
> uncached/
> alarm/
>
>
> Whent this bug happens there are tiny "gaps" on the chart (look for the
> "oswietlenie" line)
> http://img221.imageshack.us/img221/6616/meteo22gi.png
> It is not(!) rrdtool or my script issue (I am 99% sure)
>
> Today I had another problem, after leaving only ds2438 on the network
> (entire network was only 2m long!) I could NOT enter /mnt/1wire directory,
> mc has hanged, ls hanged. Apps could not list that directory! Reboot of the
> system did not help. I must addmit that ds2438 based device does work with
> my windows pc and ibutton viewer 32 software without any problems, crashes
> etc.
>
> I have upgraded fuse library but do I have to recompile owfs for the new
> fuse upgrade to take effect? My owfs is 2.1RC
>
I don't know, but fuse version hasn't been a factor.
Can you try the newest owfs? Pull a version from the CVS, or I'll send you a 
copy.
> P.s
> I had owfs hang after removing one of the ds18b20 from the network too (I
> simply unplug rj12 connector) is it a normal behavior?
>
No. owfs shouldn't care.
> Slackware 2.4.28
I don't know about 2.4 kernels and usb, specifically libusb. Should be ok. I 
have a similar setup running on a serial connector on a 2.4 kernel that has 
been nearly flawless for over a year, specifically 18B20s and 2438 
(humidity), with 20m cable all parasitic. See 
>
> Please help me! And sorry for my english :-)
> TIA
>