Ah, writing to '/simultaneous' actually seems to wait for the conversion to
complete. I didn't realize that. I'd better check the code here ...
... Yes, it does poll for completion of the conversion. I think that
explains a few things. I'll go back to the drawing board with this new info.
Is there anywhere where this behaviour of '/simultaneous/temperature' is
documented? I mean, clears cache, polls for conversion.
On Sat, Jul 12, 2008 at 20:29, Paul Alfille <[EMAIL PROTECTED]> wrote:
> Your second use i the correct one.
>
> Write "1" to simultaneous to trigger a conversion. That also clears the
> cache. A normal read will read immeadiately the already measured temperature
> ready in the device.
>
> Paul Alfille
>
> On Sat, Jul 12, 2008 at 8:28 PM, Doug Collinge <[EMAIL PROTECTED]>
> wrote:
>
>> I'm writing myself a little Python code here and trying to use
>> 'simultaneous' but getting results that are inconsistent with my
>> understanding.
>>
>> I have multiple DS1820 devices on a bus. They are all powered devices. I
>> want to simultaneously convert them all, wait, then read them all. I'm
>> expecting that when I go to read them, since I have signalled a simultaneous
>> conversion, that they will all be already converted and ready to send their
>> data, .except perhaps the first one if I haven't waited long enough for the
>> conversion.
>>
>> I'm writing a 1 to '/simultaneous', processing some other stuff, then
>> reading them all. If I read from '/uncached/temperature' it takes
>> 600-some-odd milliseconds to read each one, which sounds like they are all
>> doing a fresh conversion. If I read from '/temperature' then I get them
>> read in much faster but I don't get a fresh conversion each time.
>>
>> What I want is for writing to '/simultaneous' to always kick off a fresh
>> conversion of all the devices so that I always get a new sample when I read
>> them, and never take data out of the cache. How can I accomplish this?
>>
>> -------------------------------------------------------------------------
>> Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
>> Studies have shown that voting for your favorite open source project,
>> along with a healthy diet, reduces your potential for chronic lameness
>> and boredom. Vote Now at http://www.sourceforge.net/community/cca08
>> _______________________________________________
>> Owfs-developers mailing list
>> Owfs-developers@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>>
>>
>
> -------------------------------------------------------------------------
> Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
> Studies have shown that voting for your favorite open source project,
> along with a healthy diet, reduces your potential for chronic lameness
> and boredom. Vote Now at http://www.sourceforge.net/community/cca08
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
-------------------------------------------------------------------------
Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW!
Studies have shown that voting for your favorite open source project,
along with a healthy diet, reduces your potential for chronic lameness
and boredom. Vote Now at http://www.sourceforge.net/community/cca08
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
