Experimental Physics and
Industrial Control System

[email protected] · Thu, 2 Sep 2010 09:14:06 -0700

Babak,

You can use compress records with waveform records...
The compress record whenever processed buffers all of the INP waveform (only its valid values <NELM)

# Circular buffer 
record(compress, "$(compressRecord)") {
        field(DESC, "Circular Buffer")
        field(SCAN, "Passive")
        field(NSAM, "$(numberOfSamplesInCompressRecord)")
        field(INP,  "$(inputWaveformRecord) NPP NMS")
        field(ALG,  "Circular Buffer")
}

Note: Make sure the compress record process only when the INP waveform has been updated entirely otherwise you may buffer the same values twice or more.
Maybe you can FLNK or PP them ...

--
Emmanuel

On 15:58 Mon 16 Aug     , Kalantari Babak wrote:
> For the synchronous data collection of SwissFEL (and its test facility)
> we make intensive use of "compress" record to locally buffer the
> acquired data in high rate at each IOC. 
> 
> In addition to single valued PVs (scalars) we need to buffer waveforms
> as well. This is especially interesting for buffering images and LLRF
> data. Before going for any development, I would like to know if anybody
> has worked on something which behaves like "compress" record (at least
> for buffering) but for waveforms (any custom record types, soft device
> supports, etc). 
> 
> Any idea is welcome.  
>    
> Babak
> 

-- 
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System