Experimental Physics and
Industrial Control System

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024	Index	1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024
<== Date ==>		<== Thread ==>

Subject:	Re: waveform arrays within SNL
From:	"Southern, Tim" <[email protected]>
To:	[email protected]
Date:	Tue, 20 Jun 2017 16:25:37 -0400

You need to define the SNL variable: locations as an integer array.

#define ARRAY_SIZE 4

int locations[ARRAY_SIZE];
assign locations to "{tel}{instr}:{mech}:locations";
monitor locations; // This tells the SNL to keep track of changes to assigned PV

There is more info on the EPICS Sequencer online documentation
http://www-csr.bessy.de/control/SoftDist/sequencer/Tutorial.html#arrays-of-variables

Here is an example code that writes values of a list of PVs to a waveform:

#define DTL_SET 10

double dtl_set[DTL_SET];
assign dtl_set to
{
    "DTL_Diag:BLM130{Loss}",
    "DTL_Diag:BLM160{Loss}",
    "DTL_Diag:BLM224{Loss}",
    "DTL_Diag:BLM248{Loss}",
    "DTL_Diag:BLM317{Loss}",
    "DTL_Diag:BLM334{Loss}",
    "DTL_Diag:BLM414{Loss}",
    "DTL_Diag:BLM428{Loss}",
    "DTL_Diag:BLM512{Loss}",
    "DTL_Diag:BLM524{Loss}"
};
monitor dtl_set;

double dtl_val[DTL_SET];
assign dtl_val to "dtl_set:wf";

double charge;
assign charge to "BCM25:Q";
monitor charge;

ss lossWFgen
{
   state update
           {
          when(delay(2.0))
          {
          // Caculate loss in rad/coulomb and write to waveform array
          for (i=0; i<DTL_SET; ++i)
                {
          pvGet(dtl_set[i]);
                if (dtl_set[i] < 0){ dtl_set[i] = 0;}
                dtl_val[i] = dtl_set[i] / charge;
                }

          pvPut(dtl_val);

          }state update

        }

}

Tim

On 6/20/17 3:22 PM, Al Honey wrote:

Hi

I cannot find an explicit example in regards to accessing the element values in a waveform array from within an SNL sequencer.

Does anybody have experience doing so?

Can’t seem to do this:

int locations;

assign locations to "{tel}{instr}:{mech}:locations"; // where locations is a waveform record with an integer array.

int locs[4] = {0,300,600,900};

        pvGet( locations );

        locs = locations;               // is the declaration for locations (above) correct?

error: incompatible types when assigning to type int[4] from type int *

         locs = locations;

This fails too:

         locs[0] = locations[0];

I guess I’m ignorant in regards to accessing the array values in the record.

Also, is it necessary to escape to C in order to update the elements in a waveform string record?

Thanks for any advice you have

Al

References:: waveform arrays within SNL Al Honey

Navigate by Date:: Prev: RE: waveform arrays within SNL Mark Rivers; Next: Re: EPICS build system DESTDIR support J. Lewis Muir; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024
Navigate by Thread:: Prev: RE: waveform arrays within SNL Al Honey; Next: Re: EPICS build system DESTDIR support J. Lewis Muir; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 <2017> 2018 2019 2020 2021 2022 2023 2024

ANJ, 21 Dec 2017

· Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System