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<== Date ==> <== Thread ==>
Subject: Re: aiRecord conversion
From: Eric Norum <[email protected]>
To: Ralph Lange <[email protected]>
Cc: [email protected]
Date: Tue, 28 Aug 2012 09:12:29 -0700
On Aug 28, 2012, at 8:55 AM, Ralph Lange <[email protected]> wrote:

On Tue Aug 28 2012 17:31:37 GMT+0200 (CEST), Eric Norum <[email protected]> wrote:
[...]

NOTE TO WHOMEVER IS MAINTAINING http://www.aps.anl.gov/epics/EpicsDocumentation/AppDevManuals/RecordRef/Recordref-8.html#HEADING8-0    ----  IT NEEDS TO BE FIXED!

Eric,

This is the prehistoric version of the Record Reference Manual, before it was wikified in 2005.
It describes the 3.13 linear conversion correctly.

Really?   Hmm…..
Let's have a look at the R3.13.10 code:

static void convert(aiRecord *pai)
{
    double val;


    val = (double)pai->rval + (double)pai->roff;
    /* adjust slope and offset */
    if(pai->aslo!=0.0) val*=pai->aslo;
    val+=pai->aoff;

    /* convert raw to engineering units and signal units */
    if(pai->linr == menuConvertNO_CONVERSION) {
        ; /* do nothing*/
    }
    else if(pai->linr == menuConvertLINEAR) {
        val = (val * pai->eslo) + pai->eoff;
    }

Looks just like the R3.14 (and R3.15 code)……


*However* -- the R3.12 code does use EGUL -- but this is over 15 years old.


All links on the EPICS web site point to the current wiki version.

I honestly don't think anyone should invest time into "fixing" history.

Maybe, but the fact that it seems to be showing up as the top google hit is a matter of concern, I think.
Proof by example -- it's clearly already tripped up one new developer.
I really (note, no yelling this time  :-) ) think that the ancient documentation should be expunged.


-- 
Eric Norum
[email protected]

Replies:
Re: aiRecord conversion Andrew Johnson
References:
aiRecord conversion Bruno Seiva Martins
Re: aiRecord conversion Eric Norum
Re: aiRecord conversion Bruno Seiva Martins
Re: aiRecord conversion Eric Norum
Re: aiRecord conversion Ralph Lange
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