* Add keymap for smt Clueboard (HHKB layout)
* Add readme for smt Clueboard (HHKB) keymap
* Flesh out the keymap a bit more to support Colemak & Dvorak
* Update README with layout image
Replacement controller for Filco Majestouch 2 104 key keyboard. BE
advises code will also work with the Black Petal controller - I don't
have one to test with. Tests working perfectly on my Filco.
Empirically, waiting for N consecutive identical scans as a debouncing
strategy doesn't work very well for the ErgoDox EZ where scans are very
slow compared to most keyboards. Instead, debounce the signals by
eagerly reporting a change as soon as one scan observes it, but then
ignoring further changes from that key for the next N scans.
This is implemented by keeping an extra matrix of uint8 countdowns, such
that only keys whose countdown is currently zero are eligible to change.
When we do observe a change, we bump that key's countdown to DEBOUNCE.
During each scan, every nonzero countdown is decremented.
With this approach to debouncing, much higher debounce constants are
tolerable, because latency does not increase with the constant, and
debounce countdowns on one key do not interfere with events on other
keys. The only negative effect of increasing the constant is that the
minimum duration of a keypress increases. Perhaps I'm just extremely
unlucky w.r.t. key switch quality, but I saw occasional bounces even
with DEBOUNCE=10; with 15, I've seen none so far. That's around 47ms,
which seems like an absolutely insane amount of time for a key to be
bouncy, but at least it works.
Using only one layer, and activating it with two keys at the moment.
As with previous comments, this isn't final, but is a good starting point for a one-handed keyboard, half a Planck-like ortholinear keyboard, or a sample to show a layout with a function layer.
Jack Humbert
Daniel Shields
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