StreamDevice reading waveforms

[Anthony Pietryla <afp@anl.gov>]

I have a device which uses SCPI protocol and returns sets of waveforms in columns where I can request how many rows to return. For instance I can query the device for 3 values of position data and it will return 2 columns (X & Y) and 3 rows. I want to read the columns into separate waveform records. I am having problems with the protocol file for which I need help.

The database records and the protocol file are listed below. When I process the record only the first values (first row of data) are written to each record. With asyn debugging turned on the console shows all three sets of data:

epics> 2015/04/09 13:52:36.877 L0 wrote
TBT_XY 3

2015/04/09 13:52:36.878 L0 read
  2000   6000
  7143   4286
  4286   1429

caget shows only the first value stored:

caget -# 5 B:Spark:TBT_Horizontal

B:Spark:TBT_Horizontal 5 3333 0 0 0 0

caget -# 5 B:Spark:TBT_Vertical

B:Spark:TBT_Vertical 5 -1111 -3333 0 0 0

*******************

The protocol file has:

getTBT_XY {
   Separator = "\n";
   out "TBT_XY 3";
   in   " %(\$1TBT_Horizontal)d %(\$1TBT_Vertical)d";
   ExtraInput = Ignore;
}

**************

The database records are:

record(waveform, "$(P)$(R)TBT_Horizontal")
{
   field(DESC, "TBT Horizontal")
   field(DTYP, "stream")
   field(INP,  "@spark.proto getTBT_XY($(P)$(R)) $(PORT)")
   field(NELM, "262144")
   field(EGU,  "um")
   field(FTVL, "LONG")
}

record(waveform, "$(P)$(R)TBT_Vertical")
{
   field(DESC, "TBT Vertical")
   field(DTYP, "Soft Channel")
   field(NELM, "262144")
   field(EGU,  "um")
   field(FTVL, "LONG")
}

********************

When I comment out the “ExtraInput = Ignore;” line in the protocol file I get error messages:

2015/04/09 15:53:58.170 L0 wrote
TBT_XY 3

2015/04/09 15:53:58.170 L0 asynOctetBase interrupt
2015/04/09 15:53:58.171 L0 read
  3333  -1111
 -3333  -5556
 -2000      0

2015/04/09 15:53:58.271 L0 B:Spark:TBT_Horizontal: 29 bytes surplus input "<0a> -3333  -5556<0a> -200..."
2015/04/09 15:53:58.271 L0 B:Spark:TBT_Horizontal: after 13 bytes: "  3333  -1111"

caget -# 5 B:Spark:TBT_Horizontal

B:Spark:TBT_Horizontal 5 3333 0 0 0 0

caget -# 5 B:Spark:TBT_Vertical

B:Spark:TBT_Vertical 5 -1111 -3333 0 0 0

--
Anthony Pietryla
Principal Controls Engineer
Advanced Photon Source
Argonne National Laboratory

Phone: 630-252-7430
Fax: 630-252-6123