Stream device with waveform records

["Roehrig, Christian via Tech-talk" <tech-talk at aps.anl.gov>]

Hello,

 

    I could use some help formatting an output from a waveform record that uses stream.

 

My IOC is built with:

    Base 7.0.4

    Asyn 4.40

    StreamDevice 2.8.8

    SNCSEQ 2.2.6

 

Here is the record definition.

 

record (waveform, "$(P)$(R):ScanListC")

{

   field(DESC, "Send configuration command.")

   field(DTYP, "stream")

   field(OUT,  "@daq970A.proto set_scan_route $(PORT)")

   field(NELM, "22")

   field(FTVL, "STRING")

}

 

Here is the stream protocol.

 

set_scan_route {

   separator=",";

   out "ROUT:SCAN(@%d)";

}

 

Here is the part of the SNL program that I use to put data into the waveform record.  It may put anywhere from 0 to NUM_CHANNELS (currently 22) integers into the waveform record.

 

int scan_list[NUM_CHANNELS];

assign scan_list to "{P}{R}:ScanListC.VAL";

 

ss set_scan {

 

   state construct_list {

               

      when (set_scan_list == 1) {

 

         set_scan_list = 0;

         counter = 0;

     

         for (channel = 0; channel < NUM_CHANNELS; channel++)

         {

            pvGet(channel_include_in_scan_901A[channel]);

 

            if (channel_include_in_scan_901A[channel] == 1)

            {

               scan_list[counter] = channel + 101;

               counter = counter + 1;

            }

         }

         pvPut(scan_list);

     

      } state construct_list  

   }

}

 

Here is the output on the asyn port when that part of the program runs after I have selected channels 101 and 103 on the MEDM screen and clicked the “Set Scan List” button.

 

ROUT:SCAN(@101,103,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

 

What I want the output to be is:

 

ROUT:SCAN(@101,103)

 

 

Is there a way to have stream reject the zeros that are not valid data?

 

Chris

--

Christian Roehrig

Principal Controls Engineer

Accelerator Systems Division

Argonne National Laboratory

Office: 630-252-7278

Cell: 630-327-6855