1) Yes they are:
cat /ow/10.*/type; gives me
DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20root@hemx:~#
cat /ow/10.*/type; echo
DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20DS18S20
2) It doesn't seem to matter:
root@hemx:~# echo 1 >/ow/simultaneous/temperature; time ( cat
/ow/10.*/temperature;)
21.6875 21.75 21.6875 21.625 21.625
21.5625 21.6875 21.8125 21.625 21.5625 21.6875
21.6875
real 0m1.850s
user 0m0.000s
sys 0m0.000s
H
2013-10-10 19:08, Jerry Scharf skrev:
> Hi,
>
> Are these 18s20s? I am used to seeing higher resolution on the
> temperature from 18B20s.
>
> You can actually take the sleep out of there. The first read will stall
> until the conversion completes and then the rest will happen at the bus
> transaction speed.
>
> I always used the uncached directory when doing timing work, just to
> make sure I am not getting cached data that would screw up the timing.
> What I do is a couple runs with out simultaneous and a couple with and
> look for the difference in elapsed time.
>
> jerry
>
> On 10/10/2013 09:25 AM, Håkan Elmqvist wrote:
>> And here is the result for 12 DS1820:
>> root@hemx:~# echo 1 >/ow/simultaneous/temperature; time (sleep 1; cat
>> /ow/10.*/temperature;)
>> 23.5 23.3125 23.375 23.5 23.25 23.5
>> 23.375 23.375 23.5 23.5 23.5625 23.375
>> real 0m1.944s
>> user 0m0.000s
>> sys 0m0.000s
>>
>>
>>
>>
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Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from
the latest Intel processors and coprocessors. See abstracts and register >
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