Experimental Physics and
Industrial Control System

Hinko Kocevar <[email protected]> · Fri, 14 Sep 2012 17:30:01 +0200

Hi Andrew,

Sounds even better to do this stuff in C than in DB, because we put a

big emphasis on performance, too.

Thank you!

Best Regards,
Hinko

On 09/14/2012 04:31 PM, Andrew Johnson wrote:

Hi Hinko,

You should also be able to replace the waveform record with an aSub record and
implement the sub-array replacement part in C code, which would need fewer
records on the IOC and is probably slightly more efficient, but will take more
development work to implement.

- Andrew

On 2012-09-14 Hinko Kocevar wrote:

Ned, Tim thank you for suggestions. We'll try out solution ASAP.

Best Regards,
Hinko

On 09/13/2012 06:33 PM, Tim Mooney wrote:

Hinko,

You could do this with the acalcout (array calcout) record in the calc
module. (http://www.aps.anl.gov/bcda/synApps/calc/aCalcoutRecord.html) If
.BB is the M-element replacement array, you can read the waveform into
the .AA field, overwrite with M elements from .BB, beginning at index N,
and write the result back to the waveform record, by configuring the
record like this:

.A = M
.B = N
.INAA = "waveform.VAL NPP"
.CALC = "AA[0,B-1]+(BB[0,A-1]>>B)+(AA[A+B,-1]>>A+B)"
.OUT = "waveform.VAL PP"

Tim

----- Original Message -----
From: "Hinko Kocevar" <[email protected]>
To: "Tech Talk" <[email protected]>
Sent: Thursday, September 13, 2012 6:59:05 AM
Subject: waveform changes using subArray

Hi,

We are trying to support a modification of long array (i.e. more than
500 integer values) seen as a waveform in EPICS IOC. Lets say that it is
possible and valid for user to change only one or two values from this
array. By using waveform user needs to get all 500 integers locate the
one she wants to change, do the modification, store complete array back.
Using subArray to make a "window" into waveform sounded like a good
solution, but as I just read in the docs, subArray does not support
value writing back to the waveform.

Can this be done in some other manner? The goal here would be to allow
user to get/see/change/set only the part of waveform, that shes
interested in.

Thank you!

Hinko

--
Hinko Kocevar
Software development engineer
Instrumentation Technologies d.d.
Velika pot 22, SI-5250 Solkan - Slovenia
T:+386 5 3352600, F:+386 5 3352601
E-mail: [email protected]
http://www.i-tech.si

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System