On 1/26/2014 12:11 PM, Peter C. Wallace wrote: > > I would simplify the index logic to this: > > Always latch the current count on index (probably rising) edge > and provide the latched count to the driver. Have a (clearable) bit > that indicates the index was latched.
Thanks! That makes sense and really helps. <snip> > main things missing: > > index polarity, AB gating of index, input filtering I can do signal polarity for all encoder inputs in one XOR instruction, so I'll have that. I was thinking of adding input filtering, since I am hopeful that I can get the encoder software taking less than 1 uS per loop, and I think I can implement it with a few instructions per signal (10-20 nS extra per bit) and have minimal overhead when disabled. The AB gating logic is out, if you don't think it's required. That makes things a *LOT* easier. :) -- Charles Steinkuehler [email protected]
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