RE: Record referencing inside device support

[Mark Rivers <rivers@cars.uchicago.edu>]

It sounds to me like it might be better to write a driver based on asynPortDriver, rather than writing device support.

 

Device support is more difficult because you need to understand how each record works.  If you write a driver based on asynPortDriver you can use the standard asyn device support.

 

https://epics.anl.gov/modules/soft/asyn/R4-34/asynPortDriver.html

 

This is a tutorial on writing an asynPortDriver, starting from a very simple version and working up to a more complex one.  This is for a Measurement Computing device using the vendor library.

 

https://github.com/epics-modules/measComp/blob/master/documentation/measCompTutorial.pdf

 

Mark

 

 

From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> On Behalf Of Allan Serra Braga Bugyi
Sent: Wednesday, November 7, 2018 11:15 AM
To: tech-talk@aps.anl.gov
Subject: FWD: Record referencing inside device support

 

Hi Andrew,

 

In my mind, the C code will be a file containing all the functions to connect, request data stream/polling, run equipment adjustment routines, change properties and close connection. All of this is provided by the manufacturer .so library (which I'm adding to the LIBS target of the IOC's Makefile). So, the IOC will carry everything within itself needed to control the equipment.

 

What I have in mind is to add this .cpp file to the SRCS target of the IOC's Makefile, and to call all of these functions using subroutine records.

 

The equipment is an interferometer from SmarAct, called PicoScale.

 

Best,
Allan S. B. Bugyi.

---

De: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> em nome de Johnson, Andrew N. via Tech-talk <tech-talk@aps.anl.gov>
Enviado: quarta-feira, 7 de novembro de 2018 14:54:16
Para: tech-talk@aps.anl.gov
Assunto: Re: Record referencing inside device support

 

Hi Allan,

On 11/7/18 10:47 AM, Allan Serra Braga Bugyi wrote:
> 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?

What is "your C code" — where is it running and what calls it? You need
to describe what you're doing it a bit more detail for us to be able to
help you as the answers will be different for different circumstances...

- Andrew

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