Experimental Physics and
Industrial Control System

"Evans, Richard K. \(GRC-H000\) via Tech-talk" <tech-talk at aps.anl.gov> · Mon, 10 Jul 2023 14:25:24 +0000

Hi Ralph,

Thanks for the insights! .. I'll add that to my notes on all the different ways to consider doing this. 

Cheers!
/Rich

From: Ralph Lange <ralph.lange at gmx.de> 
Sent: Sunday, June 25, 2023 5:06 AM
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Cc: Evans, Richard K. (GRC-H000) <richard.k.evans at nasa.gov>
Subject: [EXTERNAL] Re: Real-Time Spectral Analysis of streaming data in EPICS operator screens.

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Hi Rich, 

For a simple DAQ application that does not use areaDetector, I recently implemented a 1-D FFT device support using the FFTW3 library, loosely based on code from Michael Davidsaver. 
https://github.com/ralphlange/fftw

This Device Support avoids copying arrays and swaps pointers in and out of the array type records instead.
While our initial application is actually relatively slow (and could have just copied the data), I wanted to make it a more generally useful module and gain experience doing that zero-copy array support.

Cheers,
~Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System