Experimental Physics and
Industrial Control System

Paweł Prędki <[email protected]> · Wed, 24 Aug 2011 22:25:00 +0200

Hi Xihui,

Yes, I changed that as well. I get the same amount of data as with

caget. That is 54752 for a 1710x1680 'image' and 16960 for 1000x1000.

Could it have anything to do with the fact that it takes some time to

fill the rec->bptr buffer in the read_wf function? I guess not because I

am able to get a nice 40000 element buffer for a 200x200 'image' but I

get LESS than that for 1000x1000.

I don't know if there's another place some kind of limit is set...

Cheers,
Pawel

W dniu 2011-08-24 19:29, Chen, Xihui pisze:

Hi Pawel,

Did you set the CSS Prefrences->CSS Core->EPICS->max_array_bytes? CSS doesn't use the environment variable EPICS_CA_MAX_ARRAY_BYTES.

Thanks,
Xihui

-----Original Message-----
From: Paweł Prędki [mailto:[email protected]]
Sent: Wednesday, August 24, 2011 6:07 AM
To: Kasemir, Kay
Cc: TechTalk
Subject: Re: Dynamic images in BOY

Hello Kay,

It's been quite some time since I raised this topic but now I finally
managed to try your way for 1-channel images. All in all it works fine.
There is one problem, though. The images we're dealing width are of
resolution of up to 1710x1680 which is way above the default
EPICS_CA_MAX_ARRAY_BYTES value. I changed this environmental variable to
6 000 000 and everything seemed fine again. There were no more errors.
However, only 54752 elements are really being sent. I checked it using
caget and in BOY.

My database entry looks as follows:

record(waveform, "CAMERA1:WAVETEST") {
	field(DTYP, "imgwave")
	field(NELM, "2872800")
	field(FTVL, "SHORT")
}

By the way, I tried FTVL, "UCHAR" and I got negative values when the
real values exceeded 127 when writing to the waveform in the IOC.

I wrote soem very simple device support routines that fill the waveform
with counter-like data (0..255) in the read_wf routine. I'm setting the
NORD field of the PV to 1710*1680 and it is there afterwards so I know
the loop works fine.

Do you have any ideas what can be wrong? Is there some other size limit
that I am not aware of?

Regards,
Pawel

W dniu 2011-06-06 15:33, Kasemir, Kay pisze:

On 6/6/11 08:59 , "Paweł Prędki"<[email protected]>   wrote:

Is it possible to do such a thing in BOY? There is an Image widget but I
believe it's for static images only.

The "Intensity Graph" widget displays waveforms that are really grayscale
images.

For example:
waveform with 10000 elements, "width" 100 means:
Elements 0...99 are the first row of the image,
elements 100..199 are the second row of the image and so on.
You need to specify the minimum and maximum element value,
like 0 and 255, which will then be mapped to black...white
or some other color map of your choosing.

-Kay

--

Paweł Prędki
Technical University of Lodz
Department of Microelectronics and Computer Science
ul. Wolczanska 221/223, 90-924 Lodz, Poland
tel. +4842 6312720

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System