Re: Skip updating an output link in aSub ?

[Michael Davidsaver <mdavidsaver@gmail.com>]

On 01/14/2016 11:32 AM, Lingyun Yang wrote:

Hi Michael,

I tried your ideal, but did not succeed. I may made mistakes, here is the sample code:

As Andrew points out, there is an easier way to do this if you want to process all or none of the outputs.

Also, I had been assuming that the desired conditional links were local (DB_LINK).  From your example it looks like these may be CA_LINKs, in which case the 'NPP' modifier has no effect.

record(aSub, "$(p)P") {
   field(INPA, "$(p)WF")
   field(NOA, "6")
   field(FTA, "DOUBLE")

   field(INPB, "$(p)WF:X")
   field(NOB, "6")
   field(FTB, "SHORT")


   field(OUTC, "$(p)TO1 NPP")
   field(FTVC, "DOUBLE")
   field(NOVC, "1")

   field(OUTD, "$(p)TO1.DISV PP")
   field(FTVD, "SHORT")
   field(NOVD, "1")

   field(OUTE, "$(p)TO2 NPP")
   field(FTVE, "DOUBLE")
   field(NOVE, "1")

   field(OUTF, "$(p)TO2.DISV PP")
   field(FTVF, "SHORT")
   field(NOVF, "1")

   field(OUTG, "$(p)TO3 NPP")
   field(FTVG, "DOUBLE")
   field(NOVG, "1")

   field(OUTH, "$(p)TO3.DISV PP")
   field(FTVH, "SHORT")
   field(NOVH, "1")

   field(SNAM, "splitMarkedVals")
}

Here is the Python test code and its output:

# the initial three values
caput(["l:TO1", "l:TO2", "l:TO3"], [10,20,30])
print caget(["l:TO1", "l:TO2", "l:TO3"])
# split this l:WF to TO1,TO2,TO3, using l:WF:X as mask
caput("l:WF:X", [0, 1, 1])
caput("l:WF", [6, 5, 4])
caput("l:TO1.DISA", 0)
caput("l:TO2.DISA", 0)
caput("l:TO3.DISA", 0)
print "initial TO1:", caget(["l:TO1", "l:TO1.DISV", "l:TO1.DISA"])
print "initial TO2:", caget(["l:TO2", "l:TO2.DISV", "l:TO2.DISA"])
print "initial TO3:", caget(["l:TO3", "l:TO3.DISV", "l:TO3.DISA"])

print caget(["l:TO1", "l:TO2", "l:TO3"])

caput("l:P.PROC", 1)
# the result should be [6, 20, 30] or [10, 5, 4]
# depending mask means drop or drop
print "TO1", caget(["l:TO1", "l:TO1.DISV", "l:TO1.DISA"])
print "TO2", caget(["l:TO2", "l:TO2.DISV", "l:TO2.DISA"])
print "TO3", caget(["l:TO3", "l:TO3.DISV", "l:TO3.DISA"])



[10.0, 20.0, 30.0]
initial TO1: [10.0, 0, 0]
initial TO2: [20.0, 1, 0]
initial TO3: [30.0, 1, 0]
[10.0, 20.0, 30.0]
TO1 [6.0, 0, 0]
TO2 [5.0, 1, 0]
TO3 [4.0, 1, 0]

On Wed, Jan 13, 2016 at 10:43 PM, Michael Davidsaver <mdavidsaver@gmail.com> wrote:

Hi Lingyun,

> Is there anyway skip updating any/some of the output PVs in the aSub
routine ?

Nope sorry.  At least no directly.

One slightly ugly workaround is to do the conditional in a second
record.  Then use another of the aSub outputs to drive the condition.
Something like:

> record(aSub, "...") {
>  ...
>   field(OUTA, "other NPP")
>   field(OUTB, "other.DISV PP")
> }
> record(waveform, "other") {
>   field(DISA, "0")
>   ...
> }

VALB!=0 of the aSub allows 'other' record is processed.  VALB==0
prevents it.  Note that the 'NPP' in OUTA prevents that link from
causing processing.

Michael

On 01/13/2016 05:53 PM, Lingyun Yang wrote:
> Hi,
>
> I am writing a aSub routine to do some multiinput-multioutput data
> analysis.
> In some cases, I do not want to update the output links. e.g. let those
> OUTA-OUTU PVs values untouched.
>
> If I do not do anything to the prec->vala to prec->valu, the
> corresponding PVs still get updated, but with some default values,
> e.g. 0.0 for DOUBLE.
> I also tried to set effective length (e.g. set neva=0), but it did not
> work for an ao record.
>
> Is there anyway skip updating any/some of the output PVs in the aSub
> routine ?
>
> Thanks.
>
> Best regards,
> Lingyun
>

--

------------------
Lingyun YANG
Skype Name: lingyun_zjdt