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<== Date ==> <== Thread ==>

Subject: RE: AreaDetector bindings and RBV propagation
From: Mark Rivers <rivers@cars.uchicago.edu>
To: Iain Marcuson <Iain.Marcuson@sydorinstruments.com>, "tech-talk@aps.anl.gov >> EPICS Tech Talk" <tech-talk@aps.anl.gov>
Date: Wed, 10 May 2017 13:19:27 +0000
> I found that when I toggled the passed to ADStatus (alternating from 3 to 4 and back), the caget read the new value.  
> It looks like it only updates on change.

Yes, that is true.  callParamCallbacks() only does the callbacks to device support if the value set by setXXXParam has changed since the last time callParamCallbacks() was called.  As you observed the only way to force a callback at present is to write a dummy value and then the desired value before calling callParamCallbacks().

Mark



________________________________________
From: Iain Marcuson [Iain.Marcuson@sydorinstruments.com]
Sent: Wednesday, May 10, 2017 8:11 AM
To: Mark Rivers; tech-talk@aps.anl.gov >> EPICS Tech Talk
Subject: RE: AreaDetector bindings and RBV propagation

Thank you for your response, and sorry for not getting back to you sooner.

> >10. Caget $(P)$(R)DetectorState_RBV.  It is "Readout" (numeric value 2),
> not 3 as would be expected from step 9.
>
> That does not make sense to me.  If your driver called
> setIntegerParam(ADStatus, 3) and then callParamCallbacks(addr) then the
> record should have the value 3, not 2.
>

I found that when I toggled the passed to ADStatus (alternating from 3 to 4 and back), the caget read the new value.  It looks like it only updates on change.

Iain.

>
> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [
> The Get Status code is
>
> if (function == detector_get_status_)
>     {
>       printf("Received SDGetStaus command.\n");
>       // XXX Does putting a Get make the set take effect?
>       getIntegerParam(ADStatus, &det_status);
>       printf("Detector status before set is %i.\n", det_status);
>       setIntegerParam(ADStatus, 3);
>     }
>
> And the GetStatus record is:
> record(longout, $(P)$(R)GetStatus)
> {
>       field(DTYP, "asynInt32")
>       field(OUT, "@asyn($(PORT),$(ADDR),$(TIMEOUT))SDGETSTATUS")
> }



References:
AreaDetector bindings and RBV propagation Iain Marcuson
RE: AreaDetector bindings and RBV propagation Mark Rivers
RE: AreaDetector bindings and RBV propagation Iain Marcuson

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