Re: Variable SCAN Intervall and Roundoff function

[Andrew Johnson <anj@aps.anl.gov>]

Hi Raul,

On 08/16/2016 08:32 AM, info22@online.de wrote:
> i have two question für a simple controlapplication.

I can answer your second question:

> 2.) I use a voltage divider with a poti in rheostat-mode (1024 steps).
> Because it's non-linear I have to calculate the respective bits for a
> value. My record works finde:
> 
> record(calc, "LINEAR_" ) {
>   field(INPA, "LINEAR_ NPP NMS" )
>   field(CALC, "CALCULATION")
>   field(PREC, "2")
> }
> 
> How can I round off the value? Let's say my calculated value is 375,6
> (steps). How can I round the result off to 375 and not 376? I want to
> round off all result:
> Example: 512,8 = 512 (noit 513)

The calc engine that is used by the calc and calcout record types is
documented at
http://www.aps.anl.gov/epics/base/R3-15/4-docs/AppDevGuide/node20.html#SECTION002020000000000000000
and if you look under section 19.2.1.9 you'll see it supports the
floor() numeric function, which rounds its argument value down to the
next-lower integer.

- Andrew

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