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Don't use a global variable to hold the result.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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This avoids having the state appear to change the first time we look
at the device.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Track state of encoder better and only bump values when the full
motion is detected (all four states).
Signed-off-by: Keith Packard <keithp@keithp.com>
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The mechanical encoders go through all four steps per click while the
optical ones have a single step per click. Support both kinds.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This increases the default debounce time for quadrature encoders to
30ms, which cleans up the mechanical encoders on TeleLCO v0.2. Also
change state tracking to explicitly check for expected state values to
avoid mis-triggering.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Debouncing per-pin means we don't lose transitions, which makes
counting a lot more precise.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Set the timer to 200Hz for a 5ms debounce interval. Then, simply look
for transitions ending in both bits in the encoder being off, which
indicates the the encoder is resting in a detent. If bit '2' is
turning off, the encoder was rotated clockwise, otherwise the encoder
was rotated counter clockwise.
This is a lot more reliable, although still not perfect.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This splits the fast-timer portion out of the debounce helper code and
shares that with the quadrature driver which now uses it directly.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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With this, a single task can wait for any button or quadrature input
device.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Mostly works now, should work reliably with a bit of input filtering.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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