Experimental Physics and
Industrial Control System

"Chen, Xihui" <[email protected]> · Wed, 24 Aug 2011 13:29:27 -0400

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
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System