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[21:16:55] <jepler> when I zoom in on the individual wobbles of velocity, I can see that they consist of 1 more cycle of +1 than -1
[21:17:21] <jepler> so I think the true rate is 2000+epsilon
[21:17:53] <jepler> but that's also down to how well the clocks agree between linux and the hm2 board, and we know that's not perfect by any means
[21:20:10] <PCW> The DPLL filter is not perfect either
[21:21:04] <PCW> I could improve the damping factor a bit
[21:24:57] <PCW> I would expect to be within 100 PPM or so (7I80 is +-50 PPM, PC should be similar))
[21:26:06] <PCW> (not that its terribly important)
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[21:36:21] <jepler> in that trace I captured, I think the nominal rate is 1600*1000 edges/second. 14 edges are gained over 500ms. 1600028/1600000-1 is 17.5ppm, so it's actually quite decent agreement
[21:37:13] <jepler> or did I miss a 0 in there somewhere?
[21:37:25] <jepler> no I think that's right
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[21:59:50] <KGB-linuxcnc> 03Jeff Epler 05jepler/hm2-encoder-dpll f687ca9 06linuxcnc 10docs/man/man9/hostmot2.9 10src/hal/drivers/mesa-hostmot2/encoder.c 10src/hal/drivers/mesa-hostmot2/hostmot2.h hm2: encoder: enable dpll when supported by firmware * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=f687ca9
[21:59:50] <KGB-linuxcnc> 03Jeff Epler 05jepler/hm2-encoder-dpll 841ae71 06linuxcnc 10docs/man/man9/hostmot2.9 hm2: improve documentation of timers on ssi, stepgen * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=841ae71
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[22:02:36] <jepler> pcw_home: branch jepler/hm2-encoder-dpll for you to test if you're so inclined
[22:03:43] <KGB-linuxcnc> 03Jeff Epler 05master c4ea03c 06linuxcnc 10docs/src/Submakefile 10docs/src/gui/gmoccapy.txt Merge remote-tracking branch 'origin/2.7' * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=c4ea03c
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[22:32:29] <PCW> I'll give it a test tomorrow
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