Michael Smith wrote: > Jan I think what I can gather from the example that this should be > enough to get things done. I'm just not clear on what the > "rtmac_waitinfo" structure returns, what does the three return > variables do nl. cycle_no, cycle_start, clock_offset? From what > reference point are these values calculated? I assume it might be from > the start of each frame, but I'm not sure.
Yeah, yeah, documentation. :)
- cycle_no: Continuous counter for the sync frames the master
issued (it's guaranteed to not jump even on backup
master overtake)
- cycle_start: Calculated start time of the current cycle based on the
local clock
- cycle_offset: Offset between local and master clock for this cycle
(local + offset = master)
Note that the current implementation of the cycle_offset does guarantee
a strictly monotonic global clock, but the jitter is in orders of the
IRQ latency for the particular platform (a few 10 us).
HTH,
Jan
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