RE: binary output record

[Mark Rivers <rivers@cars.uchicago.edu>]

Hi Gennaro,

Here is an example of how I've done what you are asking with longout and longin records.  The same scheme will work with a bo and bi records.  

The input _RBV record gets processed when the value changes, and it updates the soft output record without processing the asyn output record.

record(longout, "$(P)$(R)FileNumber")
{
    field(PINI, "YES")
    field(OUT, "$(P)$(R)FileNumber_write PP")
    field(VAL, "1")
}

record(longout, "$(P)$(R)FileNumber_write")
{
    field(SDIS, "$(P)$(R)FileNumber_Sync.PACT")
    field(DISV, "1")
    field(DTYP, "asynInt32")
    field(OUT, "@asyn($(PORT),$(ADDR),$(TIMEOUT))FILE_NUMBER")
}

record(longin, "$(P)$(R)FileNumber_RBV")
{
    field(DTYP, "asynInt32")
    field(INP,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))FILE_NUMBER")
    field(SCAN, "I/O Intr")
    field(FLNK, "$(P)$(R)FileNumber_Sync")
}

record(longout, "$(P)$(R)FileNumber_Sync")
{
    field(DOL,  "$(P)$(R)FileNumber_RBV NPP")
    field(OMSL, "closed_loop")
    field(OUT,  "$(P)$(R)FileNumber PP")
}

Mark



-----Original Message-----
From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of gennaro.tortone@na.infn.it
Sent: Tuesday, April 14, 2015 10:12 AM
To: tech-talk@aps.anl.gov
Subject: binary output record


Hi,
I'm developing an EPICS IOC and I'm facing with following problem:

IOC has the following binary output (bo) record:

record(bo,"gpio01") {
   field(DTYP,"GPIO control")
   field(DESC,"GPIO line 1")
   field(SCAN,"Passive")
}

I'm able to drive the bo (on/off) but in this application it is possible
to drive the GPIO externally (outside EPICS IOC) and I want bo record to
get the status of pin (e.g. by a binary input) in order to avoid
out-of-sync;

is it possible to receive an example configuration of bo/bi record to
accomplish this ?

Thanks in advance,
Gennaro

-- 
Gennaro Tortone
INFN Napoli
Italy
tel: +39 81 676169

"Computer Science is no more about computers
     than astronomy is about telescopes."
     - Edsger Dijkstra