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Subject: RE: Creating an error counter
From: Mark Rivers <rivers@cars.uchicago.edu>
To: "'Ford, Christopher'" <caf@slac.stanford.edu>, "Flewellen-Gore, Andrew (US)" <andrew.flewellengore@baesystems.com>, "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 20 Jul 2017 17:57:54 +0000

VAL is a legal operand.  This is from the CALC record in the Record Reference Manual:  https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Calculation

 

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

The keyword VAL returns the current contents of the VAL field (which can be written to by a CA put, so it might not be the result from last time the _expression_ was evaluated).

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

 

Mark

 

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Ford, Christopher
Sent: Thursday, July 20, 2017 12:53 PM
To: Flewellen-Gore, Andrew (US); tech-talk@aps.anl.gov
Subject: Re: Creating an error counter

 

Hi Andrew,

I have not seen VAL used as an operand of a calc _expression_.

Please consider setting INPB to "$(P):$(R):DEBUG:COUNTER" and then simplifying the calc _expression_ to "A+B".

Thanks,

 -Chris Ford

  SLAC

 


From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Flewellen-Gore, Andrew (US) <andrew.flewellengore@baesystems.com>
Sent: Thursday, July 20, 2017 9:49 AM
To: tech-talk@aps.anl.gov
Subject: Creating an error counter

 

Hello, and thanks for reading,

 

I’m having trouble keeping a counter for the number of errors coming in from an electron microscope (SEM). I’m using the Stream device driver to listen to incoming messages from the SEM, and when a message matches a certain format that identifies it as an error message, the PV processes and stores the new error message, overwriting the last. When this happens I would like to have a second record process and increment a counter, so that I can keep track of the number of error messages coming in.

 

My current setup gets the most recent error message correctly, but does not correctly increment the counter (the counter stays at zero). Here is the relevant code from the record definition file.

 

record(waveform,$(P):$(R):DEBUG:LISTEN)  {

    field(DESC,"Holds last SEM error")

    field(DTYP,"stream")

    field(NELM,"1000")

    field(FTVL,"CHAR")

    field(SCAN,"I/O Intr")

    field(FLNK,"$(P):$(R):DEBUG:COUNTER")

    field(INP, "@devhardware.proto debugListen() L5 0")

}

 

record(calc,$(P):$(R):DEBUG:COUNTER)  {

    field(DESC,"Counter of # of errors")

    field(SCAN,"Passive")

    field(INPA,"1")

    field(CALC,"VAL+A")

}

 

When the first record processes due to an interrupt on a received error message, it is supposed to forward-link the calc record to process, causing an increment to the counter.

 

Any help or insight is appreciated.

-Andrew


References:
Re: Creating an error counter Ford, Christopher

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