Hi Pascal and others, thanks for your measurement resaults. I have the gut feeling that my I2C driver is not running on appropriate speed. Maybe it is switched to low-speed-mode (=10kHz) or standard-mode (=100kHz) but not on fast-mode (=400kHz), which would be the maximum the DS2482 is capabale of. I have no glue how to know about the current selected I2C speed, or even more important: how to switch it to fast-mode???
In addition I made some measurements reading out the temperature of a DS2438. According the data-sheet it shall be performed typically within 3ms, max in 10ms, so much faster than the DS18B20 (Thanks to Paul for this hint :-) When accessing it via owcapi and DS2482 the following result: 1000ms at uncached/26.40BACF000000.45/temperature 3,5ms at 26.40BACF000000.45/temperature via USB the following: 76ms at uncached/26.40BACF000000.45/temperature So the owcapi implementations seems to be fast, but at the moment it accesses the I2C is starts slowing down drastically. But I can't use USB, because the DS2482 are on the boards... Thanks Achim -- View this message in context: http://old.nabble.com/different-access-performance-tp32230443p32255177.html Sent from the OWFS - Dev mailing list archive at Nabble.com. ------------------------------------------------------------------------------ FREE DOWNLOAD - uberSVN with Social Coding for Subversion. Subversion made easy with a complete admin console. Easy to use, easy to manage, easy to install, easy to extend. Get a Free download of the new open ALM Subversion platform now. http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
