Experimental Physics and
Industrial Control System

Di Wang via Tech-talk <tech-talk at aps.anl.gov> · Wed, 18 Mar 2020 01:13:07 +0900

Hi Michael,

  I found an event lost situation in my MRF VME-EVR-230RF, so I am

wondering how will mrfioc2 handle the event received right after the

timestamp reset event (i.e. 125) ?

We might send event code only 1 tick (i.e. 9 nanosecond) later than

before one, so the 'right after' could be very fast. Here is a brief

example.

Event       Timestamp
1           953053925.999,917,620
125       953053925.999,977,626  <-----TS reset event
2 <-----lost, and the timestamp should be 953053926.999,977,650
3            953053926.000,100,043
4            953053926.000,450,210

  I understand that when TS reset event is received the 32-bit seconds

register will be reset, and below callback function would be called, but

I still do not understand the process logic and the reason of event lost.

https://github.com/epics-modules/mrfioc2/blob/7bee26590cb5fea8117d0a12920bc281ab1c7cd8/evrMrmApp/src/drvem.cpp#L1430

  For you convenience, some information might help:

epics 3.15.5, devlib 2-2.10, mrfioc 2-2.2.0 (I added several functions

to buffer the events in drvem.cpp)

event clock: 114 MHz, repetition rate: 50 Hz, more than 120 events are

monitored

Regards,
Di WANG
Linac Control Group, KEK

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System