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: [email protected]
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