Gwendal Grignou 81d269dc00 common: lightbar: Add histeresis to prevent flickering ...

When ALS is enabled, if light is around one threshold (say 40 lux),
the lightbar will flicker between readings.
Add a histeresis to prevent the flickering.
The current setting is:

setting    ^
(dim)    2 | ------+---->---+
         1 |       +----<---+--->---+
(bright) 0 |                +---<---+---------
           +-------+--------+-------+--------> lux
               20       40      60

BRANCH=smaug
BUG=chrome-os-partner:44400
TEST=check in a dark room (30~40 lux) there is no flickering.
Add unit test.

Change-Id: I4018e2c2ed764abf9c9ed28e2d50a3e94a7d5f75
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/308205

2015-10-23 18:03:12 -07:00

1.9 KiB

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