Hi, I think what Jan explained is that DS2408 itself accepts only the full byte.
So when you write a single PIO, owserver does the caching and rewrites the whole byte My basic setup is an Intel-based linux PC (several years old), running Ubuntou 16.04 with owserver from the package, 3.1p1. About 10 m cat-5 cable between the LinkUSB and the Hobbyboards card. I also tested a Raspberry 1B, with just a short cable between the LinkUSB and the Hobbyboards card, which may have improved the situation a little bit (that's why I attempted to strengthen my ground line), but the problems persisted, perhaps at a lower rate. Since I rewrote my code to only write when needed (i.e. read owserver first and write only if there is change), I have seen no problems for almost 2 months. That's why I naively thought "high traffic" might be the problem. But the way I interpret Jan, the failure in caching properly (although not understood) is not likely to be related to "overloading". That could still be consistent with my observations, I guess, I have gone from 6x60x24 writes per day to a few. Apart from the HobbyBoards DS2408 I have nearly 20 DS18B20 and a few DS2406, all parasitically powered, and a powered DS2450 on the bus. Arne On 28.11.2016 09.30, Martin Patzak (GMX) wrote: > > On 11/18/2016 08:11 PM, Jan Kandziora wrote: >> Am 18.11.2016 um 10:45 schrieb Arne Raaen: >>> Hi, >>> >>> I have a HobbyBoards relay card based on DS2408, used with LinkUSB >>> >>> I used a routine (unconditionally) updating PIO.0 through PIO.5 every >>> minute. >>> >>> I observed that PIO.6 and PIO.7 would be activated at random intervals, >>> typically a few times per day or less. >>> >> You cannot set single PIOs on the DS2408, owfs has to set them all as >> one. That's why owfs maintains the last state written to the PIO byte. >> As you found out the byte stored within owfs may be incorrect for >> circumstances we have yet to check. > Well, that is rather news to me. I do set single PIOs on two DS2408 in > my application. > I NEVER expirienced a problem with random switching IOs - I run my > heating system since 2010 with owfs, so I don't think I have been lucky > all this time ;) > > Would be interesting to know what exact system and environment the > random switching appears in. > > I can write up my system or answer more detailed questions if it might > help. Just ask. > > Cheers Martin > >> In the meantime, store the desired output pattern within your >> application and write PIO.ALL (or PIO.BYTE) instead of individual bits. >> That should make your problem go away immediately. >> >> Kind regards >> >> Jan >> >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > > ------------------------------------------------------------------------------ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
