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User Oriented APIs for Timing System

This workshop, led by Jim Chen of Hytec Electronics Ltd, focuses on user-oriented APIs for timing systems, highlighting the MRF timing module's multifaceted functions, including timestamps and event FIFO. It discusses the diverse signal generation capabilities, various outputs, and the challenges new users face in configuration. Key user needs like generating triggers with specific parameters are outlined, along with suggestions for making trigger implementation more user-friendly. The workshop emphasizes the importance of maintaining a generic API across platforms and addressing differences in architecture and signal generation.

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User Oriented APIs for Timing System

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  1. Timing Workshop – 5th June 2014, Prague User Oriented APIs for Timing System Jim Chen Hytec Electronics Ltd

  2. Timing Workshop – 5th June 2014, Prague The Problem • MRF timing module now has many functionalities rather than purely trigger generation. These include timestamp, event FIFO, data transmit and even GPIO etc. This is excellent! • Timing system also has many ways of generating signals – distributed bus, events, sequencer, prescaler etc. This is also good. • Variety of outputs – TTL, LVPECL, CML, Univ I/O. Great! • Many form factors. • One of the problems – functions are not always to all platforms • Not easy to configure – especially for new comers Jim Chen Hytec Electronics Ltd

  3. Timing Workshop – 5th June 2014, Prague What we end up • MRF provides low level APIs for VxWorks/RTEMS and Linux • Each lab has its own app implementation. • mrfioc2 • Cosylab • Taiwan Light Source – TPS pciGeneral Device Support • Hytec UDP for Orion, APIs for ELI, NUS • …… • Re-invent the wheel from time to time and it continues Jim Chen Hytec Electronics Ltd

  4. Timing Workshop – 5th June 2014, Prague What end-user needs Triggers! Jim Chen Hytec Electronics Ltd

  5. Timing Workshop – 5th June 2014, Prague What end-user needs • Generate repetitive triggers in different frequencies • Fire single shot • Set delay/relative delay and width for each trigger • Enable/disable triggers/modules • Set up timestamp • Transfer data • Interrupt notification and callback • etc… Jim Chen Hytec Electronics Ltd

  6. Timing Workshop – 5th June 2014, Prague What would be nice • Trigger implementation transparent to the user –EvrSetPulseProperties, EvrSetPrescalerTrig, EvrUnivDlySetDelay, EvrSetFineDelay – hide all these! • User function oriented rather than device function oriented • A Generic API function set for all platforms – EPICS, TANGO, OPC, VxWorks, Linux and Windows • Maintained by community or by Jukka? Jim Chen Hytec Electronics Ltd

  7. Timing Workshop – 5th June 2014, Prague How easy to achieve this • Not easy given so many options • Need well defined structures • Need many branches to distinguish architecture differences, signal generation differences, trigger type differences, output type differences, jitter requirement and accuracy differences etc. • Separate the OS specific from the generic APIs • Proper interrupt mechanism and callback • Endian issue Jim Chen Hytec Electronics Ltd

  8. Timing Workshop – 5th June 2014, Prague What we can do Jim Chen Hytec Electronics Ltd

  9. Timing Workshop – 5th June 2014, Prague The main entities • OS resource wrapper – base address, interrupt, DMA if required • Jukka’s low level APIs • Trigger structure – need to cover all aspects • Trigger – need to encapsulate all operations • EVG – capable of defining trigger source or the combination • EVR – simple class Jim Chen Hytec Electronics Ltd

  10. Timing Workshop – 5th June 2014, Prague The implementation • Let’s discuss…… Jim Chen Hytec Electronics Ltd

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