Dnia 2011-02-05, sob o godzinie 20:59 -0200, Roberto Spadim pisze: > i don't know how alias work > but you have a directory /uncached/xxxxxxxxxxxx/temperature and > /xxxxxxxxxxxx/temperature > you should use the cached version, not the uncached
ok, that's right I'm using cached version, the alias could be misleading so the commands look like this owread -s 2485 28.E4B5BF020000/temperature But for Paul wrote, I understand that it won't work now in owfs if sensors are parasite powered. -- p4trykx > > 2011/2/5 patyrk <[email protected]>: > > Dnia 2011-02-05, sob o godzinie 11:23 -0500, Paul Alfille pisze: > >> Yes, you need the cache to store the time markers. > > > > To Roberto: > > Does owread -s 2485 patryk/temperature use the cache? > > > > > >> If simultaneous works in passive mode, I'll make the change. > > I think with all parasite XOR powered it will work. But I'm not certain > > what happens with mixed configuration. > > Specs says this > > If the DS18B20 is powered by an > > external supply, the master can issue read time slots after the Convert > > T command and the DS18B20 will > > respond by transmitting a 0 while the temperature conversion is in > > progress and a 1 when the conversion > > is done. In parasite power mode this notification technique cannot be > > used since the bus is pulled high by > > the strong pullup during the conversion. > > > > Is this "read time slots" optional? > > > > -- > > P4trykx > > > > > > > > > > > > > > > > > >> > >> On Sat, Feb 5, 2011 at 10:54 AM, Roberto Spadim <[email protected]> > >> wrote: > >> > maybe it works with cached version, not uncached > >> > > >> > 2011/2/5 patyrk <[email protected]>: > >> >> Hello > >> >> Fist, sorry for double messages. My e-mail client went nuts. > >> >> > >> >> I previously said that simultaneous temp. conversion is not possible > >> >> with parasite power. Well, I was wrong. This mail is to sum up all that > >> >> wrote before. > >> >> > >> >> The specs of ds18b20 aren't very clear about it. However there is a > >> >> command skip rom mentioned on page 11 > >> >> > >> >> SKIP ROM [CCh] > >> >> The master can use this command to address all devices on the bus > >> >> simultaneously without sending out > >> >> any ROM code information. For example, the master can make all DS18B20s > >> >> on the bus perform > >> >> simultaneous temperature conversions by issuing a Skip ROM command > >> >> followed by a Convert T [44h] > >> >> command. > >> >> > >> >> Moreover I asked about this simultaneous conversion on some Polish uC > >> >> board and 2 users replied that they use this feature and it works even > >> >> with parasite power. So I thinks it would be nice to have this feature > >> >> working in owfs because its very useful with many ds1820. > >> >> > >> >> I've found some messages form 2006 and 2008 on this list that say > >> >> simultaneous is working. But it seems not to work in my case. I use > >> >> ds2480b master connected to serial port and few ds18b20 and 2 ds18s20. > >> >> > >> >> Maybe I'm using it wrong. This is my script > >> >> #!/bin/sh > >> >> owwrite -s 2485 /simultaneous/temperature "1" > >> >> > >> >> temp="temperature" > >> >> owread -s 2485 patryk/"$temp" > >> >> owread -s 2485 pokoj/"$temp" > >> >> owread -s 2485 pokoj_grzejnik/"$temp" > >> >> owread -s 2485 korytarz/"$temp" > >> >> owread -s 2485 korytarz_grzejnik/"$temp" > >> >> owread -s 2485 tata/"$temp" > >> >> owread -s 2485 dziadek/"$temp" > >> >> owread -s 2485 zielony/"$temp" > >> >> > >> >> echo "koniec" > >> >> > >> >> > >> >> It takes about 10 seconds no matter if I use simultaneous. > >> >> owwrite takie about 0.02 seconds that's to short. > >> >> > >> >> > >> >> -- > >> >> p4trykx > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> ------------------------------------------------------------------------------ > >> >> The modern datacenter depends on network connectivity to access > >> >> resources > >> >> and provide services. The best practices for maximizing a physical > >> >> server's > >> >> connectivity to a physical network are well understood - see how these > >> >> rules translate into the virtual world? > >> >> http://p.sf.net/sfu/oracle-sfdevnlfb > >> >> _______________________________________________ > >> >> Owfs-developers mailing list > >> >> [email protected] > >> >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > >> >> > >> >> > >> > > >> > > >> > > >> > -- > >> > Roberto Spadim > >> > Spadim Technology / SPAEmpresarial > >> > > >> > ------------------------------------------------------------------------------ > >> > The modern datacenter depends on network connectivity to access resources > >> > and provide services. The best practices for maximizing a physical > >> > server's > >> > connectivity to a physical network are well understood - see how these > >> > rules translate into the virtual world? > >> > http://p.sf.net/sfu/oracle-sfdevnlfb > >> > _______________________________________________ > >> > Owfs-developers mailing list > >> > [email protected] > >> > https://lists.sourceforge.net/lists/listinfo/owfs-developers > >> > > >> > >> ------------------------------------------------------------------------------ > >> The modern datacenter depends on network connectivity to access resources > >> and provide services. The best practices for maximizing a physical server's > >> connectivity to a physical network are well understood - see how these > >> rules translate into the virtual world? > >> http://p.sf.net/sfu/oracle-sfdevnlfb > >> _______________________________________________ > >> Owfs-developers mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > > > > > ------------------------------------------------------------------------------ > > The modern datacenter depends on network connectivity to access resources > > and provide services. The best practices for maximizing a physical server's > > connectivity to a physical network are well understood - see how these > > rules translate into the virtual world? > > http://p.sf.net/sfu/oracle-sfdevnlfb > > _______________________________________________ > > Owfs-developers mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > > > > ------------------------------------------------------------------------------ The modern datacenter depends on network connectivity to access resources and provide services. The best practices for maximizing a physical server's connectivity to a physical network are well understood - see how these rules translate into the virtual world? http://p.sf.net/sfu/oracle-sfdevnlfb _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
