Experimental Physics and
Industrial Control System

To my knowledge,
there is no update.
In our driver, we do it like this:

    /* If not moving, trigger a record processing at low rate */
    if (!nowMoving) setDoubleParam(pC_->motorPosition_, newPositionInSteps + 1);
    setDoubleParam(pC_->motorPosition_, newPositionInSteps);

And I added a test case:
https://github.com/EuropeanSpallationSource/MCAG_Base_Project/blob/master/epics/test/500_DLY-STOP.py

Out of curiosity:
Which kind of device are you using ?


On 25/05/16 23:50, Ford, Christopher wrote:

Hi,

In 2015 there was some discussion on Tech-Talk about how to force a callback for a parameter that had not changed values.
Mark Rivers suggested a work-around, as shown below.
I wonder if anyone has an update on the situation since then?  Has any other method appeared?  Or did you have success with the work-around?

Thanks,
 -Chris Ford, SLAC

On16 Nov 2015 Mark Rivers writes:

If a driver wants to force a callback there is a method that does not require any changes to the base classes, e.g. exposing statusChanged_ as protected or adding a new
isMotorRecordnowFilterButAlwaysProcess_ flag.  The driver simply needs to set a parameter to a different value from present and then back to its current value, for example
 setDoubleParam(pC_->motorPosition_(position+1.);
 setDoubleParam(pC_->motorPosition_(position);
 callParamCallbacks();

Replies:

Re: asyn: what if a driver wants to force callbacks? Mark Davis

Re: asyn: what if a driver wants to force callbacks? Ford, Christopher

References:

Area Detector question Jörn Wüstenfeld

RE: Area Detector question ulrik.pedersen

RE: Area Detector question Mark Rivers

asyn: what if a driver wants to force callbacks? Ford, Christopher

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