Paul,
I would like to +1 this ability. I have a couple buses that have more
sensors than I would like because of physical limitations. I have
regular stability problems with simultaneous reads. After reading this,
I suspect that I am at the limit of the power available on the these
buses for simultaneous conversion.
I am making the basic assumption that this is done as an extension of
the current simultaneous function. So I do the hand wave and say the set
have had their initialization started and then I do standard device
reads to collect the data.
My next version of the software looks at sensors in classes and the
different classes have different polling intervals. This would fit
perfectly into that scheme.
One question I have is about how this works with multiple buses and
switches. An innocent set of IDs can produce a very complex underlying
set of actions cause the right things to happen. Would this be limited
to a single bus? If so, doses the software filter the set against the
known devices on the bus?
There are a few issues to work out in doing this. One is how to expose
this to owfs. My first thought would be to have a writable file that I
would open, write a set of IDs to, then close. Then there would be a bit
similar to simultaneous that says do the pattern on the loaded set. You
could make the file readable also to see the last loaded set, but from
practical software point of view I would always write it and convert it
rather than bothering to read and test it.
On the lower level the choice is between having this as a routine or a
thread. Since the writes to the bus need to be serialized, I am not
sure how much advantage a thread is for doing the initialization loop.
My assumption is that the computational time in owserver for doing this
are insignificant compares the bus communication time.
jerry
On 07/10/2014 11:09 AM, Colin Reese wrote:
Hello,
After talking with iButtonLink, it was brought to my attention that
without
additional power, it is possible to have unsuccessful simultaneous read if
too many sensors are on the network, due to current draw during the
conversion.
Using the TMEX API, I can perform a match ROM and then issue a conversion
command, and then come back later to read the converted value. This way I
can issue conversion commands for, say, 20 ROMs without waiting for
conversion more than once.
Is there an analogous feature in owfs, e.g. a 'simultaneous' with a
specified group of ROMs?
Thanks,
Colin
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