Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> · Wed, 18 Mar 2020 16:48:21 +0000

> by analogy waveformRecord has
>> db_post_events(prec, &prec->val, monitor_mask);
> note 'val' not 'bptr'.

The mca record has worked with no changes in 3.14, 3.15, and 7.0.3 with these lines:

mcaRecord.dbd:
recordtype(mca) {
        include "dbCommon.dbd"
        field(VERS,DBF_DOUBLE) {
                prompt("Code Version")
                special(SPC_NOMOD)
                initial("1")
        }
        field(VAL,DBF_NOACCESS) {
                prompt("Value")
                special(SPC_DBADDR)
                pp(TRUE)
                size(4)
                extra("void *val")
        }
        field(BPTR,DBF_NOACCESS) {
                prompt("Buffer Pointer")
                special(SPC_NOMOD)
                interest(4)
                size(4)
                extra("void *bptr")
        }

mcaRecord.c:
    if (MARKED(M_VAL)) db_post_events(pmca,pmca->bptr,monitor_mask);

So it is posting monitors on the bptr field, not the val field, and it seems to work fine.

It looks like Pete is doing what the mca record does, but it is not working.  Why?

Mark

________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, March 18, 2020 11:25 AM
To: Siddons, David
Cc: EPICS Tech Talk
Subject: Re: monitors on array variables

On 3/18/20 9:10 AM, Siddons, David via Tech-talk wrote:
> I have an IOC with several array PVs. I do not seem to be able to have them post monitors, so my display screens don't update. Has something changed between 3.14 and 3.15 which might cause this?
>
> The PVs are declared in the dbd file like this:
>
>       field(SPCT,DBF_NOACCESS) {
>               prompt("Value")
>              special(SPC_DBADDR)
>              pp(TRUE)
>              extra("void *           spct")
>             }
>
>         field(PSPCT,DBF_NOACCESS) {
>                 prompt("Buffer Pointer")
>                 special(SPC_NOMOD)
>                 interest(4)
>                 extra("void *           pspct")
>             }
>
> and the changed values are posted in record support like this:
>
> db_post_events(pscal,&(pscal->pspct),DBE_VALUE);
>
> Am I doing something wrong? This setup used to work in 3.14, although I haven't tried regressing to 3.14 for this code.

Try:

> db_post_events(pscal,&pscal->spct,DBE_VALUE);

by analogy waveformRecord has

> db_post_events(prec, &prec->val, monitor_mask);

note 'val' not 'bptr'.

https://github.com/epics-base/epics-base/blob/25bb966cbc4be1f2a47116a8b9ec940bc2270b12/modules/database/src/std/rec/waveformRecord.c#L325

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System