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<== Date ==> <== Thread ==>
Subject: EPICS DB Record does not update with periodic SCAN
From: Adrian Martinez via Tech-talk <tech-talk at aps.anl.gov>
To: "Gotz, Malte via Tech-talk" <tech-talk at aps.anl.gov>
Date: Thu, 15 Feb 2024 12:34:45 +0000
Hi all,

I have a local PV declarated in my EPICS driver: 

createParam( "time_nanosec", asynParamInt32, &idxUpdateDgnNanoSec, EWB_SYNC_FLG_PRE);

This PV is also present in the database file:

record(ao, "$(user):DgnNanoSecSet")
{
   field(DTYP ,"asynInt32")
   field(OUT  ,"@asyn($(PORT),$(ADDR),$(TIMEOUT))time_nanosec")
   field(DESC ,"Nanoseconds part of current time")
   field(VAL,  "0")
   field(EGU,  "s")    
   field(HOPR, "4294967293")
   field(LOPR, "0")        
}

record(ai, "$(user):DgnNanoSecRb")
{
   field(DTYP ,"asynInt32")
   field(INP,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))time_nanosec")
   field(PREC, "2")
   field(SCAN ,".2 second")
   field(EGU , "s")
   field(DESC ,"Nanoseconds part of current time")
}

My problem: This PV does not update the readback value (DgnNanoSecRb) if the SCAN field is periodic (0.1, 0.2, 1, ... seconds) and I need that kind of SCAN (it is not valid "I/O Intr" scan for my application).
If I change the scan to "I/O Intr" , the value of the readback is updated properly.

Does anyone know what is happening?

Thanks in advance, Adrián.


Adrián MARTÍNEZ MÚNERA

Embedded Software Engineer | HEP Department | Orolia

P +34 958 28 50 24

SAFRAN Electronics & Defense Spain S.L.


Edf. CETIC, Calle Periodista Rafael Gómez Montero, 2, oficina 5, 18014 Granada


www.safran-navigation-timing.com 

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