asynDriver - update record (timestamp), on no change

[Joao Afonso via Tech-talk <tech-talk@aps.anl.gov>]

Hello,

I have an asyn driver IOC that periodically receives new data, updates the parameters (and timestamps), and runs the callbacks for the "I/O Intr" records.

It has an extra thread that runs something like this:

while(1)

{

    int value = wait_for_data();

    setIntegerParam(dev_addr, param_id, value)

    updateTimeStamp();

    callParamCallbacks(dev_addr);

}

However, 'callParamCallbacks' will not update the record timestamp if the value received keeps being the same.

From what I understand, this is the intended behaviour of asynDriver - no updates if data is the same -, but I would like to know if there a way to enforce it (to update the record timestamp)?

One possible solution I think will work is to update the parameter with a random value first, to trigger the 'new data' flag, but it feels like an hack...

Example:

setIntegerParam(dev_addr, param_id, 0)

setIntegerParam(dev_addr, param_id, value)

Thank you,

Joao Afonso