Experimental Physics and
Industrial Control System

Till Straumann via Tech-talk <tech-talk at aps.anl.gov> · Thu, 10 Jun 2021 12:25:24 +0200

Unfortunately, I believe what you want to do (and which seems

reasonable) is not possible.

You can work-around (if performance is not critical), e.g.,  by writing

a calcout device support

module that
 1. fetches a copy of the entire waveform
 2. modifies the target element
 3. writes the modified waveform back to the waveform record

- Till

On 6/10/21 12:00 PM, Florian Feldbauer via Tech-talk wrote:

Hey all,

I have a question regarding waveform records. So far I never really

worked with waveform or any other array-type record.

The Situation is:
- Our DAQ collects the data coming from our Pixel sensor.

- Every 10s an IOC reads the stored data and fills a waveform record

with the hits (index of array = pixel, value = number of hits in the run)

- I use an image widget in Phoebus to display the hit map of the pixel

sensor

Now, for testing the sensors after bonding, we can perform charge

injections to individual pixels. We can also mask individual pixels if

they are too noisy.

As we need to always send the information for all pixels to the

sensor, I thought about using a second waveform record holding the per

pixel configuration.

Using the cursor X/Y PVs from the image widget in phoebus I could

select a pixel I want to inject a charge for testing (or I want to

mask b/c it's noisy) and get calculate the index within the waveform

record from these two PV's using a CALC record.

So now my actual question: Let's say I want to mask pixel 42, is it

possible to just write to val[41] from my config waveform record from

a CALC(OUT) record without touching the other values of the array?

Cheers,
Florian

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System