Re: Dynamic images in BOY

[Paweł Prędki <ppredki@dmcs.pl>]

Hello,

I think I found an important clue. Take a look at the table below:

|     NELM     | Element count returned by cainfo | NELM % 65536 |
------------------------------------------------------------------
|   40000      | 40000				  | 0		 |
|   65537      | 1				  | 1		 |
|   72900      | 7364				  | 7364	 |
|   90000      | 24464				  | 24464	 |
| 1000000      | 16960				  | 16960	 |
| 2872800      | 54752				  | 54752	 |
------------------------------------------------------------------

It seems like the range limit for the element count is 65536 (2^16) and 
I always get the modulo of the total number of elements in the waveform.
Is there any other CA setting responsible for that?

Pawel

W dniu 2011-08-24 12:07, Paweł Prędki pisze:
> 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"<ppredki@dmcs.pl> 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