One more thing... You are using owserver alone or with owfs? I'm running owserver with configuration:
device = /dev/i2c-0 Celsius timeout_volatile = 60 timeout_stable = 60 timeout_directory = 30 timeout_presence = 60 timeout_network = 0 pid_file = /mnt/mtd/owpid foreground error_print = 1 error_level = 3 timeout_persistent_low = 600 timeout_persistent_high = 3600 format = fic cache_size = 0 Maybe there is something wrong? W dniu 2011-02-04 07:22, Pascal Baerten pisze:
here the output of a simple test in php (using ownet.php) via owserver on debian nslu2 owfs 2.8p3 and busmaster is 2482-800reading pio is ~50ms reading temperature is ~770ms reading cached temp (frm owfs memory) is 15ms measuring timming for temperature and pio connect to ownet duration=3mstemperature for /bus.0/uncached/28.0521AD010000/temperature = 17.6875 duration=771mswaiting 5s duration=5006ms set /bus.0/12.5B1E6D000000/PIO.B=1 duration=118ms read /uncached/bus.0/12.5B1E6D000000/sensed.B=0 duration=49ms set /bus.0/12.5B1E6D000000/PIO.B=0 duration=85ms read /uncached/bus.0/12.5B1E6D000000/sensed.B=1 duration=46ms waiting 1s duration=1002mstemperature for /bus.0/28.0521AD010000/temperature = 17.6875 duration=15msdone 2011/2/3 Roman Jałoza <r.jal...@a2s.pl <mailto:r.jal...@a2s.pl>> How looks your timings? How fast can you read temperature or PIO? Are these timings are similar to my? (650ms to PIO and 1-1,2 s for temp without converT command ) Roman W dniu 03.02.2011 21:44, Pascal Baerten pisze:Hi Roman, I'm using owfs with ds2482-800 and found the communication slower than other bus masters solutions. However not that slow than you describe. Analysing 1-Wire communication with a digital scope shown that an idle period is visible between each byte and "tri-bits". This idle period is around 1,3ms for my system (nslu2 with debian), this reduce the effective throughput to 4kbit/s instead of 15kbit/s. Do you have an hadware assited i2c controller embedded or are you using software i2c? I think that my behaviour come from software i2c that does not buffer transactions and require attention from owfs between each byte and tri-bits. Regarding the temp reading, I think you better to read 'temperature' property after a simultaneous converT command instead of 'fasttemp' which is not prepared by the simultaneou command. - Paul correct me if not true - You may also find usefull information by starting your owfs daemon with '--debug' param. Reading temp involve a blocking transaction that wait until conversion is finished by polling 1-wire or for fixed time depending on method used and parasite power mode. Pascal 2011/2/3 "Roman Jałoza - TechBase Sp. z o.o." <r.jal...@a2s.pl <mailto:r.jal...@a2s.pl>> Hi, I'm developing 1-wire communication at embedded computer with ARM9 and ds2482-100 master chip. Is anyone test owfs performance via i2c master? I'm reading temperature from ds18b20 sensors and it took a long time (from 1,5s to 8s) with fasttemp read. It should be much faster. I've made some tests with writing simultaneous/temperature bit but performance was still the same - means poor. Reading PIO states from ds2408 device took about 600ms (but sometimes 1,5s). Devices are powered (reading with parasite mode took 5-8s). Is anyone have some idea? some solution?--Best Regards ** *Roman Jałoza* // ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. 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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 Owfs-developers@lists.sourceforge.net <mailto:Owfs-developers@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/owfs-developers -- Pascal www.brain4home.eu <http://www.brain4home.eu>to subscribe, send a mail to <list-subscr...@brain4home.eu <mailto:list-subscr...@brain4home.eu>>------------------------------------------------------------------------------ The modern datacenter depends on network connectivity to access resources and provide services. 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