In order to explore simultaneous temperature readings I have set up two DS1820 with VDD connected to +5V and executed the commands below. As can be seen from the resulting output writing to /ow/simultaneous/temperature takes only 40 ms instead of the expected 0.7 s and the two temperature readings take a total of 1.4 s. What am I doing wrongly? I am using owfs-2.9p1 on an AMD Athlon(tm) 7450 Dual-Core Processor running Ubuntu 12.04.3 LTS. Thanks in advance for any tip. Håkan
root@hemx:/# pkill owfs; /opt/owfs/bin/owfs -u --allow_other /ow; ls /ow; \ cat /ow/10.*/type; echo; cat /ow/10.*/errata/die; echo; cat /ow/10.*/power;echo; \ time echo 1 >/ow/simultaneous/temperature; \ time cat /ow/uncached/10.*/temperature; DEFAULT: ow_usb_msg.c:(295) Opened USB DS9490 bus master at 4:4. DEFAULT: ow_usb_cycle.c:(191) Set DS9490 4:4 unique id to 81 66 09 28 00 00 00 44 10.4E272C020800 10.C11E2C020800 81.660928000000 alarm bus.0 settings simultaneous statistics structure system uncached DS18S20DS18S20 C2C2 11 real 0m0.041s user 0m0.000s sys 0m0.000s 22.25 22.25 real 0m1.388s user 0m0.000s sys 0m0.000s root@hemx:/# -- Håkan Elmqvist Sunnerdahlsv 7 167 62 Bromma Telefon: +46 (8) 80 18 81, +46 (704) 56 74 81, +46 (176) 84 077 epost: hak...@smeden.org ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers