Re: Stream2 support in ADEiger

["Yendell, Gary \(DLSLtd, RAL, LSCI\) via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Mark,

We started trying to integrate this at DLS when Dectris were developing stream2 and asking for feedback. It didn't quite make it to production and has since been sitting idle as its not a priority for us right now, but the implementation would probably be a good starting point for implementing it in ADEiger.

The key thing you are going to want to do is make use of the stream2 C library dectris have written to parse the cbor buffers from the detector, along with tinycbor. This is available here

https://github.com/dectris/documentation/tree/main/stream_v2/examples

we included it in our build by adding that repo as a submodule in the third_party directory here:

https://github.com/DiamondLightSource/eiger-detector/tree/stream2/cpp/data

this will save a ton of effort because parsing cbor in C is very involved.

It is built into the eiger processor plugin here:

https://github.com/DiamondLightSource/eiger-detector/tree/stream2/cpp/data/frameProcessor/src

Specifically, the handle_rx_socket and handle_*_message functions is where we are using that library to parse the cbor buffer and access the fields:

https://github.com/DiamondLightSource/eiger-detector/blob/stream2/cpp/data/frameProcessor/src/EigerProcessPlugin.cpp#L89

This implementation was pretty close to what we needed. There is some subtlety left to figure out, for example the start/stop time fields which are an array of time and base frequency that we don't handle properly.

I hope this is useful!

Cheers,

Gary

---

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
Sent: 02 April 2025 20:54
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Stream2 support in ADEiger

 

Folks,

 

ADEiger needs to have support for the Stream2 interface that Dectris added in firmware 2022.1.

 

Does anyone know if some site has worked on this?  There are no pull-requests for it in ADEiger on Github.

 

If not, I plan to work on it soon.

 

Thanks,

Mark

 

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