Experimental Physics and Industrial Control System
You might be missing the
callParamCallbacks();
any time that you perform a set command.
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Iain Marcuson
Sent: Monday, May 08, 2017 3:29 PM
To: [email protected] >> EPICS Tech Talk <[email protected]>
Subject: AreaDetector bindings and RBV propagation
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.
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