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<== Date ==> <== Thread ==>

Subject: Re: waveform arrays within SNL
From: "Southern, Tim" <t1o@ornl.gov>
To: tech-talk@aps.anl.gov
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

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