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

Subject: AreaDetector bindings and RBV propagation
From: Iain Marcuson <Iain.Marcuson@sydorinstruments.com>
To: "tech-talk@aps.anl.gov >> EPICS Tech Talk" <tech-talk@aps.anl.gov>
Date: Mon, 8 May 2017 20:28:57 +0000
I have completed a basic AreaDetector module for my camera and am working on adding enhancements.  Presently, I am attempting to add readback of acquisition status.  I am unfamiliar with the normal operations of the RBV PVs, but tried manipulating one for practice.  The sequence of events is:
1. Start IOC.
2. Caget $(P)$(R)DetectorState_RBV.  It is idle.
3. Run acquisition command.
4. Caget $(P)$(R)DetectorState_RBV.  It is idle.
5. Caput $(P)$(R)GetStatus  1.  PV and function are detailed below.  Initially reported value is 0, as expected.
6. Caget $(P)$(R)DetectorState_RBV.  It is "Correct" (numeric value 3, as expected from GetStatus code).
7. Caput $(P)$(R)DetectorState_RBV 2.
8. Caget $(P)$(R)DetectorState_RBV.  It is "Readout" (as expected from ADBase.template, numeric value 2).
9. Caput $(P)$(R)GetStatus 1.  Initially reported value is 3, not 2 as would be expected from step 8.
10. Caget $(P)$(R)DetectorState_RBV.  It is "Readout" (numeric value 2), not 3 as would be expected from step 9.

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")
}

Why are the values not propagating between parameter library and PVs, and how does one update these readback value PVs?

Thank you,

Iain Marcuson.

Replies:
RE: AreaDetector bindings and RBV propagation Mark S. Engbretson
RE: AreaDetector bindings and RBV propagation Mark Rivers

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