Re: Record referencing inside device support

["Mooney, Tim M. via Tech-talk" <tech-talk@aps.anl.gov>]

Hi Allan,

If you look at some existing device-support code (for example,  base-3.15.4/src/std/dev/devAaoSoft.c) you'll see that routines in that file are called with a pointer to the record struct.  You might want to look at this presentation from a recent EPICS class:

https://epics.anl.gov/docs/APS2015/01-EPICS-Device-Support.pdf

Writing Device Support - EPICS

epics.anl.gov

APS EPICS Training • 2015-01-08 • Writing Device Support 2 Writing Device Support – Scope An overview of the concepts associated with writing EPICS Device Support routines.

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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From: Allan Serra Braga Bugyi <allan.bugyi@lnls.br>
Sent: Wednesday, November 7, 2018 11:10:54 AM
To: Mooney, Tim M.; tech-talk@aps.anl.gov
Subject: Re: Record referencing inside device support

 

Hi Tim,

My limited comprehension of EPICS building facility may be blurring my understanding of the problem. In my comprehension, EPICS building facility generates header files from .db files, right? So, each record will be an "instance" of the accordingly struct. However, this happens during compilation time. Where would it be possible to know the structs' names for referencing inside device support?

Best,
Allan S. B. Bugyi
Technology Development Analyst
allan.bugyi@lnls.br
(+55 19) 3512-3520

SOL/Beamline Software Group
Brazilian Synchrotron Light Laboratory (LNLS)
Center of Research in Energy and Materials (CNPEM)
http://lnls.cnpem.br

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De: Mooney, Tim M. <mooney@anl.gov>
Enviado: quarta-feira, 7 de novembro de 2018 14:53:19
Para: Allan Serra Braga Bugyi; tech-talk@aps.anl.gov
Assunto: Re: Record referencing inside device support

 

Hi Allan,

My first thought would be to write device support for the record.  Device support has access to the record structure.

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Allan Serra Braga Bugyi <allan.bugyi@lnls.br>
Sent: Wednesday, November 7, 2018 10:47:25 AM
To: tech-talk@aps.anl.gov
Subject: Record referencing inside device support

 

Hello all,

I have the need to access the record support structs inside my C code. What I want is to be able to access the records' fields to pass them as parameters to some functions. These functions are inside a dynamic library .so from the manufacturer. Any idea or workaround?

Many thanks!

Allan S. B. Bugyi
Technology Development Analyst
allan.bugyi@lnls.br
(+55 19) 3512-3520

SOL/Beamline Software Group
Brazilian Synchrotron Light Laboratory (LNLS)
Center of Research in Energy and Materials (CNPEM)
http://lnls.cnpem.br