Yes, you need the cache to store the time markers. If simultaneous works in passive mode, I'll make the change.
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
