Experimental Physics and
Industrial Control System

"Pearson, Matthew R." <[email protected]> · Wed, 11 Mar 2015 21:27:44 +0000

Something like this might work:

record(ao, "$(P):Setpoint") {
  field(DTYP, "stream")
  field(DESC, "Setpoint temperature")
  field(OUT, "@ls336.proto setSETP($(OUT)) $(PORT) $(ADDR)")
  field(FLNK, "$(P):SetBusy")
  field(EGU, "K")
}

record(dfanout, "$(P):SetBusy")
{
   field(VAL, "1")
   field(OUTA, "$(P):Busy PP")
}

record(busy, "$(P):Busy")
{
}

Then some other record reading some input will set the busy back to 0 once the process is complete:

record(calcout, "$(P):CalcDone") {
  field(INPA, "$(P):Blah.VAL CP")
  field(CALC, "(A=1)?0:1")
  field(OOPT, "Every Time")
  field(OUT, "$(P):Busy.VAL PP")
}

I think only one callback can be queued though.

Cheers,
Matt

On Mar 11, 2015, at 4:42 PM, Benjamin Franksen <[email protected]> wrote:

> I guess the idea is to make a record type that can be processed multiple times
> and fire the put callback only if specific conditions are met, i.e. some
> action (involving perhaps more than one record) have finished. Something like
> the motor record.
> 
> This can indeed be done with a busyRecord and asynchronous out links, but
> depending on what exactly is the desired functionality can be difficult to get
> right. I can try and dig out the database I once designed for that purpose.
> 
> Cheers
> Ben
> 
> Am Mittwoch, 11. März 2015, 19:01:12 schrieb Mooney, Tim M.:
>> Hi Dehong,
>> 
>> I don't understand.  All the EPICS records I've used behave correctly when
>> written to by a ca_put_callback, whether they use synchronous or
>> asynchronous device support.  Are you writing a new record type, or trying
>> to get asynchronous device support to work with an existing record type, or
>> what?
>> 
>> Tim Mooney ([email protected]) (630)252-5417
>> Software Services Group (www.aps.anl.gov)
>> Advanced Photon Source, Argonne National Lab
>> 
>> ________________________________
>> From: [email protected] [[email protected]] on
>> behalf of Zhang, Dehong [[email protected]] Sent: Wednesday, March
>> 11, 2015 1:48 PM
>> To: [email protected]
>> Subject: Please help with "caput -c"
>> 
>> 
>> Hi Friends,
>> 
>> 
>> I am trying to implement an asynchronous record, would like to support
>> 
>> this "put callback" feature.  From the documentation, it seems I have to do
>> 
>> the following:
>> 
>> 
>> 1. set "pp(TRUE)" for the field the user is going to "caput"
>> 
>> 2. make sure only call "recGblFwdLink" (within "process") when the action is
>> 
>>    finished, or use a BUSY record in the end of the FLNK chain such that it
>> 
>>    is "DONE" only when the action is finished.  -- during this process the
>> PACT
>> 
>>    field of the original record can go up and down.
>> 
>> 
>> I have been playing with all these combinations, and by adding "-w **" after
>> 
>> the "caput -c", am getting inconsistent and unreliable results -- it either
>> does
>> 
>> not work - calls back immediately, or waits unnecessarily long then calls
>> back.
>> 
>> It rarely calls back right after the original record finishes processing and
>> declares
>> 
>> the action is finished.  Guess I missed something.  Please spare a few
>> moments
>> 
>> and advice on what exactly I need to do.
>> 
>> 
>> (We use 3.14.12-0.4.0, on linux machines).
>> 
>> 
>> Thank you very much, Best regards,
>> 
>> Dehong
> 
> --
> "There are two ways of constructing a software design: One way is to
> make it so simple that there are obviously no deficiencies and the other
> way is to make it so complicated that there are no obvious deficiencies.
> The first method is far more difficult."   ― C.A.R. Hoare
> 
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System