Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Fri, 8 Nov 2013 12:55:07 +0000

Hi Benoit,

I think I see 2 problems with your database.  The main problem is that the calcout record will never process.  Should add "CP" to the INPA and INPB links as follows.

record(calcout, "$(S):$(D)_$(C):RefminAmpCalc")
{
field(FLNK, "$(S):$(D)_$(C):RefminISet")
field(CALC, "A * COS(B)")
field(INPA, "$(S):$(D)_$(C):RefminAmpSet.VAL CP MS")
field(INPB, "$(S):$(D)_$(C):RefminPhasSet.VAL CP MS")
}

CP will cause this record to process if the AmpSet or PhasSet record values change.

The second problem is that I don't see how QSet will get processed.  ISet gets processed by an FLNK from the calcout record.  I suggest adding the following to ISet:

field(FLNK, "$(S):$(D)_$(C):RefminQSet")

That way after ISet processes then QSet will process.

Mark

________________________________
From: [email protected] [[email protected]] on behalf of Benoit [[email protected]]
Sent: Friday, November 08, 2013 4:05 AM
To: [email protected]
Subject: How to use calc with two PV to set an ao record on device?

Hi everybody,

I want to perform a simple operation but as I am still new on EPICS and I don't manage to do it.
On my device I use I,Q register to set up my DAC and I want for the user to modify Amplitude and Phase Process variable to setup these I,Q.
I would like to perform this transformation at database level so that my driver remains as simple as possible.

Actually I have this:

record(ao, "$(S):$(D)_$(C):RefminAmpSet")
{
field(DESC, "RefminAmp Temporary Set Record")
field(PINI, "YES")
field(VAL, "500")
}

record(ao, "$(S):$(D)_$(C):RefminPhasSet")
{
field(DESC, "RefminPhas Temporary Set Record")
field(PINI, "YES")
field(VAL, "0")
}

record(calcout, "$(S):$(D)_$(C):RefminAmpCalc")
{
field(FLNK, "$(S):$(D)_$(C):RefminISet")
field(CALC, "A * COS(B)")
field(INPA, "$(S):$(D)_$(C):RefminAmpSet.VAL")
field(INPB, "$(S):$(D)_$(C):RefminPhasSet.VAL")
}

record(ao, "$(S):$(D)_$(C):RefminISet")
{
   field(DTYP, "asynFloat64")
   field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))refminI")
   field(PINI, "YES")
   field(VAL, "0")
   field(PREC, "2")
}

record(ao, "$(S):$(D)_$(C):RefminQSet")
{
   field(DTYP, "asynFloat64")
   field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))refminQ")
   field(PINI, "YES")
   field(VAL, "0")
   field(PREC, "2")
}

What am I doing wrong?
I have seen many example on how to use calc to read ai records but not for setting ao records.

Regards,

--
Benoit RAT

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System