fftw - EPICS Device Support for the FFTW Library

C++ EPICS Device Support module wrapping around the FFTW library v3.

The Device Support uses C++ shared pointers and the feature to swap the BPTR of EPICS array records to minimize copying of arrays.

Status

One of the DFT algorithm variants provided by the FFTW library is supported: One-dimensional, real input data transformed from the time domain (sampled data) to the frequency domain (amplitude/phase).

The module can be extended to support other variants.

Prerequisites

• A C++ compiler that supports the C++11 standard.
  Microsoft Visual C++ needs to be from Visual Studio 2015 or newer. g++ needs to be 4.6 or above.

• EPICS Base release 3.15 (and up; EPICS 7 is supported).

• The pyepics module for running the tests.

• The FFTW library (v3).

Building the module

This is a standard EPICS module.

Inside the configure subdirectory or one level above the TOP location (TOP is where this README file resides), create a file RELEASE.local that sets EPICS_BASE to the absolute path inside your EPICS installation.

Configure the compiler on Linux to use the C++11 standard by adding

USR_CXXFLAGS_Linux += -std=c++11

to the CONFIG_SITE file (or one of the host/target specific site configuration files).
It is preferable to set this option globally in EPICS Base.

Using the module

IOC applications that use the module need to

• add an entry to the Device Support module in their RELEASE.local file
• include fftw.dbd when building the IOC's DBD file
• include fftwSup in the support libraries for the IOC binary.

Documentation

Sparse.

Feedback / Reporting issues

Please use the GitHub project's issue tracker.

Credits

This module is based on ideas and code snippets from Michael Davidsaver (Osprey DCS).

License

This module is distributed subject to a Software License Agreement found in file LICENSE that is included with this distribution.