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

Subject: RE: calc VAL field not updating from bi VAL field
From: "Allison, Stephanie" <[email protected]>
To: "J. Lewis Muir" <[email protected]>, EPICS Tech Talk <[email protected]>
Date: Wed, 30 May 2012 08:55:46 -0700
Hi Lewis -

Could this be a round-off error (long to double)?  Does this CALC work:

field(CALC, "A>0.5?1:0")

Stephanie

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of J. Lewis Muir
> Sent: Tuesday, May 29, 2012 8:10 PM
> To: EPICS Tech Talk
> Subject: calc VAL field not updating from bi VAL field
> 
> I've got a problem where a calc record's VAL field is not
> updating when I expect it to.
> 
> I load the following database into my IOC:
> 
> calc-bi.db >>>
> record(bi, "$(P)Unidig1Bi1") {
>   field(ZNAM, "Low")
>   field(ONAM, "High")
> }
> 
> record(calc, "$(P)ClcBacklightBi") {
>   field(INPA, "$(P)Unidig1Bi1.VAL CP MS")
>   field(CALC, "A=1?1:0")
> }
> <<<
> 
> like this:
> 
> st.cmd >>>
> ...
> dbLoadRecords("calc-bi.db","P=17lab:")
> ...
> <<<
> 
> I then start camonitor:
> 
> camonitor console >>>
> $ camonitor 17lab:ClcBacklightBi.VAL 17lab:ClcBacklightBi.A
> 17lab:ClcBacklightBi.VAL       2012-05-29 19:48:44.845452 1 LINK
> INVALID
> 17lab:ClcBacklightBi.A         2012-05-29 19:48:44.845452 0 LINK
> INVALID
> <<<
> 
> And then I perform a series of caput commands in another console:
> 
> caput console >>>
> $ caput 17lab:Unidig1Bi1.VAL 0
> Old : 17lab:Unidig1Bi1.VAL           Low
> New : 17lab:Unidig1Bi1.VAL           Low
> $ caput 17lab:Unidig1Bi1.VAL 1
> Old : 17lab:Unidig1Bi1.VAL           Low
> New : 17lab:Unidig1Bi1.VAL           High
> $ caput 17lab:Unidig1Bi1.VAL 0
> Old : 17lab:Unidig1Bi1.VAL           High
> New : 17lab:Unidig1Bi1.VAL           Low
> $ caput 17lab:Unidig1Bi1.VAL 1
> Old : 17lab:Unidig1Bi1.VAL           Low
> New : 17lab:Unidig1Bi1.VAL           High
> <<<
> 
> camonitor shows the following:
> 
> camonitor console >>>
> 17lab:ClcBacklightBi.VAL       2012-05-29 21:11:28.307312 1
> 17lab:ClcBacklightBi.A         2012-05-29 21:11:28.307312 0
> 17lab:ClcBacklightBi.A         2012-05-29 21:11:33.423978 1
> 17lab:ClcBacklightBi.A         2012-05-29 21:11:36.990645 0
> 17lab:ClcBacklightBi.A         2012-05-29 21:12:32.507352 1
> <<<
> 
> As you can see, the 17lab:ClcBacklightBi record's VAL field
> updates once when the record first processes and then never
> again.  The "A" field is updating correctly as I change
> 17lab:Unidig1Bi1.VAL, but 17lab:ClcBacklightBi.VAL never updates
> again.
> 
> If I change the CALC expression to "A", the VAL field updates
> correctly.  If I change it back, it stops working again.
> 
> Environment:
> * VME processor module: Motorola MVME-2100 (vxWorks-ppc603)
>   - CPU: MPC 8240
>   - Memory: 32 MB
> * OS: VxWorks 5.5.2
> * Kernel: WIND 2.6
> * BSP: mv2100-asd5 (by Andrew Johnson)
> * Build toolchain: Tornado 2.2.2
> * EPICS 3.14.12.2 (+Known Problems patches)
> 
> I tried this on darwin-x86 (x86_64) and it did not fail, so to
> date it is only failing for me on my VME systems.  (I initially
> discovered the problem on an MVME-5100.)
> 
> This worked fine with older software (i.e. VxWorks 5.4.2 with
> EPICS 3.14.11) on my VME systems.
> 
> Thanks,
> 
> Lewis


Replies:
Re: calc VAL field not updating from bi VAL field Andrew Johnson
Re: calc VAL field not updating from bi VAL field J. Lewis Muir
References:
calc VAL field not updating from bi VAL field J. Lewis Muir

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