RE: Writing array data in an AreaDetector application

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

• As a related question, what records would I use if I wanted to have a waveform of readback values?  I do not see an array equivalent to setDoubleParam().

 

You have 2 choices:

• If you want the driver to decide when the waveform input record should processes then you set SCAN=I/O Intr and your driver calls doCallbacksFloat64Array().
• If you want the record to be processed periodically or otherwise from the outside then you implement readFloat64Array() which will be called when you process the record.

 

Mark

 

 

From: Iain Marcuson <iain.marcuson at sydortechnologies.com>
Sent: Thursday, May 1, 2025 1:05 PM
To: Mark Rivers <rivers at cars.uchicago.edu>; Ralph Lange <ralph.lange at gmx.de>; EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: RE: Writing array data in an AreaDetector application

 

That was indeed the problem; thank you.  As a related question, what records would I use if I wanted to have a waveform of readback values?  I do not see an array equivalent to setDoubleParam().

 

Iain.

 

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Thursday, May 01, 2025 1:56 PM
To: Iain Marcuson <iain.marcuson at sydortechnologies.com>; Ralph Lange <ralph.lange at gmx.de>; EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: RE: Writing array data in an AreaDetector application

 

The problem is in your constructor.  When you call the base class constructor you give it a bit mask of what interfaces to implement.  You need to add asynFloat64Array to that.

 

Here is an example of a driver that does that:

https://github.com/areaDetector/NDDriverStdArrays/blob/e21b2f2f74feb217a0e67ba8f8fc4bfd7efe58e0/NDDriverStdArraysApp/src/NDDriverStdArrays.cpp#L49

 

Mark

 

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Iain Marcuson via Tech-talk
Sent: Thursday, May 1, 2025 12:48 PM
To: Ralph Lange <ralph.lange at gmx.de>; EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: RE: Writing array data in an AreaDetector application

 

I do see a message I had overlooked before:

devAsynFloat64Array::initCommon, 13PIL1:cam1:PADDigiCorr find asynFloat64Array interface failed

 

I think I have the function names and signatures right, from looking at file asynPortDriver.h, if that is what you mean.

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Ralph Lange via Tech-talk
Sent: Thursday, May 01, 2025 12:54 PM
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: Re: Writing array data in an AreaDetector application

 

Hi Iain,

 

Looking at the documentation [1] and your record, it all seems fine.

The waveform record type was created as an input - that's why the configuration field is INP. Unrelated to your problem.

 

It's most probably a code issue. Is your additional method properly declared in the class declaration, so that the default implementation of the method is overridden?

 

Cheers,
~Ralph

 

[1]  https://epics-modules.github.io/master/asyn/R4-43/asynDriver.html#devAsynFloatXXXArray 

 

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