Re: Output record with TSE=-2 and info(asyn:READBACK, "1") returns <undefined> time.

[Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>]

Hi Yann,

Can you please provide the definition of the record you are using?

Here are some comments on your code:

sscanf( timeStampLastChanged/*hardware time string*, "%u.%u", &seconds, &microsecs ) != 2 )

There is a typo in this line, you are missing the / from the end of comment.  Is this because you did not use copy and paste?

time.nsec = microsecs * 100000;

The above math seems wrong.  nsec is only 1000 times microseconds, not 100000?  Or is this microsecond variable really 10 ns ticks?

pasynUser->timestamp = time;

You should not do this operation, directly copying time into timestamp.  The reason is that the asynPortDriver callback function will do this for you, and will overwrite what you have set.  Rather you should do this, as Torsten said;

setTimeStamp(time);

There is documentation here:

https://epics-modules.github.io/asyn/asynTimeStampSupport.html

Mark

---

From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Torsten Bögershausen via Tech-talk <tech-talk@aps.anl.gov>
Sent: Saturday, May 11, 2024 9:57 AM
To: Yann Mandza <yann.mandza@ess.eu>; tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: Re: Output record with TSE=-2 and info(asyn:READBACK, "1") returns <undefined> time.

 

On 2024-05-11 13:39, Yann Mandza via Tech-talk wrote:
> Dear all,
>
> I am working onan Asyn Port driver using with asynR4-42 on a Linux
> machine. Am trying to add timing support for Output record using TSE=-2 and
>
> and info(asyn:READBACK, "1"). When I caget an output PV with TSE=-2
> after caput to it the time obtained is <undefined> though the value is
> well written to the device.
>
> A camonitor on a PV with TSE=-2 and info(asyn:READBACK, "1") show an
> <undefined> time too though the read value is correct. I would like to
> associate the device timestamp to the record for output readback, and
> the current time return by epicsTimeGetCurrent to the record after a
> caput. In my poller thread this is how I set the time stamp:
>
> epicsUInt32 seconds = 0;
>
> epicsUInt32 microsecs = 0;
>
> epicsTimeStamp time;
>

Do you call setTimeStamp() ?

<https://urldefense.us/v3/__https://github.com/EuropeanSpallationSource/m-epics-ethercatmc/blob/master/ethercatmcApp/src/ethercatmcIndexer.cpp*L1798__;Iw!!G_uCfscf7eWS!Ym78ZmckUmmr90mF9sBrllYCvlNGCIZ_FitDo84KjDwEh7Tj7dWaAvjJ9ZpWelrizFvnelAsNeXwE8GCj9M$ >