2026-03-05.md

areaDetector Collaboration Meeting (2026-03-05)

Attendance

• Érico Nogueira Rolim
• Gustavo de Souza dos Reis
• Henrique Simões
• Gustavo Montenari Pechta
• Kaz Gofron
• Xiaoqiang Wang
• Irie Railton
• Jure Varlec
• Jakub Wlodek
• Tejas Guruswamy
• Mark Rivers
• QunZhang

Other issues

• Release notes procedure
  • How to add acknowledgments?
  • Discuss next meeting

Issues

• asyn:
  • Issues:
    • What's the correct way of implementing lockless asynPortDriver?
      • queueLockPort would decrease the number of mutexes, but it's a really big change
      • test lower delay values!
• areaDetector:
  • Issues:
    • Building on macOS 26.2: bundled zlib fails to compile
• ADCore:
  • Issues:
    • NTNDArrayConverterPvxs cannot handle string attributes
    • Strange INP field to record named "test"
      • More descriptive name in the PV
  • PRs:
    • Destructible drivers
    • Destroyed pool fix: prevent SIGSEGV on IOC exit when pvAccess holds NDArrays after driver/pool destroyed
      • Test with ASYN_DESTRUCTIBLE instead
• ADAndor:
  • Issues:
    • Writing the temperature setpoint for cooling fails
    • andorCCD:dataTask:, Data thread is running but main thread thinks we are not acquiring.
    • ADAndor: Document time units
  • PRs:
    • Fix no vertical dimension
• ADAndor3:
  • Issues:
    • Add support for digital delay generator settings from sCMOS iStar
  • PRs:
    • Add support for digital delay generator settings from sCMOS iStar
      • Further testing will happen next week, wait for feedback
• ADAravis:
  • PRs:
    • Destructible drivers
      • Henrique: should we keep the startup workaround?
      • Jure: it should be kept if the IOC is not shutdown nicely. Could it be changed to do a connection loop?
• ADEiger:
  • Issues:
    • What's the correct way of using Pilatus4 support?
      • https://github.com/areaDetector/ADEiger/blob/58916bb98d643fe2772203359487a63b469c51e0/iocs/eigerIOC/iocBoot/iocPilatus4/st.cmd#L22C18-L23C1 is using eiger2 template
    • Support for reading and using timestamps from Stream2
    • Support for other SIMPLON detectors -- PILATUS4 and SELUN
    • The lz4 data in Stream2 is different from Stream
  • PRs:
    • Add null check for getgrgid() in eigerDetector::writeOctet, fixes #85
      • Have to add check for getpwuid
• ADEuresys:
  • PRs:
    • Add support for multiple cameras
• ADGenICam:
  • PRs:
    • Pass asyn flags through the constructor
• ADLambda:
  • PRs:
    • Extra case added when checking the energy threshold
• ADMerlin:
  • PRs:
    • Correct RBV for both rising trig mode
    • LVDS trigger modes added
    • Scan start failed message added
    • Board temperature added
• pvaDriver:
  • Issues:
    • Using PVXS instead of PVAccessCPP
      • Not a blocker for releasing NDPluginPVXS
• Stale Items:
  • Stale Issues:
    • Find a way to stop misbehaving plugins from slowing down driver
    • NDFileNexus problem
    • Add flag to prevent overwriting files in NDPluginFile
    • Move more functionality into the ADDriver base class
    • Possible changes to NDArray and NDArrayPool
    • NDArrayPool refactor
    • File writing modes: proposed changes for R3-0.
  • Stale PRs:
    • base frame time stamp on epicsTS
    • base frame timestamp off epicsTS
    • base frame timestamp off epicsTS
    • base frame timestamp off epicsTS
    • base frame timestamp off epicsTS
    • base frame timestamp off epicsTS
    • base frame timestamp off epicsTS

Ongoing development

• Fixing incompatible pointer assignment that causes build on RHEL 10 to fail
• Camera on Windows, ImageJ PVA plugin on same machine, gets really slow (1 FPS), no issue with CA or different machines
• Stale Items:
  • Find a way to stop misbehaving plugins from slowing down driver
    • 2025-05-08: close after documenting expected plugin behavior
  • documentation
    • 2025-08-07: Jakub is setting one up, can look at docs
    • No time to take a look at it yet