Re: combining long strings

["Lang, Keenan C. via Tech-talk" <tech-talk at aps.anl.gov>]

Hello Michael,

I believe that you could theoretically solve this with separate waveform records for each of the input values, then use an acalcout record to concatenate the arrays together.

Otherwise, I would also like to put forward the luascript record (https://github.com/epics-modules/lua). It works very similarly to the calc style records just with a full programming language behind it. I had to put in a commit because I wasn't previously pulling in enum data, but if you grab the master branch you could do this:

record(luascript,"$(exp):FilePath") {

  field(INAA,"$(exp):PathMenu.VAL CP")

  field(INBB,"$(exp):DateMenu.VAL CP")

  field(INCC,"$(exp):SampleMenu.VAL CP")

  field(INDD,"$(exp):OrientationMenu.VAL CP")

  field(INEE,"$(exp):EnergyMenu.VAL CP")

  field(INFF,"$(cam):$(format)1:FileNumber CP")

  field(CODE,"return table.pack(string.byte(AA..BB..CC..DD..EE..FF, 1, -1))")

  field(OUT,"$(cam):$(format)1:FilePath PP")

}

The CODE field there concatenates the strings, turns the resulting string into a set of bytes, then puts those bytes together into an array which the record can write out to a waveform.

Keenan

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Sintschuk, Michael via Tech-talk <tech-talk at aps.anl.gov>
Sent: Monday, February 1, 2021 4:42 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: combining long strings

 

Hello EPICS-community,

 

I’m trying to find a solution for the following calculation:

 

record(scalcout,"$(exp):FilePath") {

  field(INAA,"$(exp):PathMenu.VAL CP")

  field(INBB,"$(exp):DateMenu.VAL CP")

  field(INCC,"$(exp):SampleMenu.VAL CP")

  field(INDD,"$(exp):OrientationMenu.VAL CP")

  field(INEE,"$(exp):EnergyMenu.VAL CP")

  field(INFF,"$(cam):$(format)1:FileNumber CP")

  field(CALC,"AA+BB+CC+DD+EE+FF")

  field(OUT,"$(cam):$(format)1:FilePath")

}

 

INAA to INFF are mbbo records that I want to use as dropdown-menus. Each time a dropdown-menu is changed by the user, the scalcout record recalculates the FilePath and puts the new path-string to the areaDetector FilePath record, which is a waveform. This would work fine, if there wasn’t the 40 character limitation for the scalcout-record, so the OUT field is cut. Each of the input fields is smaller then 40 character but combined (the actual path-string) is longer. Can anyone give me an example how to solve this, if possible? I searched the tech-talk but with no luck…

 

Regards

Michael  

 

Michael Sintschuk
Bundesanstalt für Materialforschung und –prüfung (BAM)
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P: +49 30 8104-5736 (BESSY, Adlershof)

P: +49 30 8104-4065 (BAM, Steglitz)
michael.sintschuk at bam.de