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<== Date ==> <== Thread ==>

Subject: Re: Dynamic images in BOY
From: Ralph Lange <[email protected]>
To: TechTalk <[email protected]>
Date: Thu, 25 Aug 2011 13:31:02 +0200
https://bugs.launchpad.net/epics-base/+bug/701673

~Ralph


On 25.08.2011 12:13, Paweł Prędki wrote:
> 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"<[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
>>>
>>
>


Replies:
RE: Dynamic images in BOY Mark Rivers
References:
Re: Dynamic images in BOY Kasemir, Kay
Re: Dynamic images in BOY Paweł Prędki
Re: Dynamic images in BOY Paweł Prędki

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