EPICS DB Record does not update with periodic SCAN

[Adrian Martinez via Tech-talk <tech-talk at aps.anl.gov>]

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.

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