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| author | Gwendal Grignou <gwendal@chromium.org> | 2015-10-22 14:13:35 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2015-10-23 18:03:12 -0700 |
| commit | 81d269dc004b6c7334e4e8eafbb2872e5b6fdcf1 (patch) | |
| tree | 85829474533fddf3e030c2aa2c105bd621bb228d /include/motion_sense.h | |
| parent | 3fc374b7fd8b618d513db27d9f10c8200f603e15 (diff) | |
| download | chrome-ec-81d269dc004b6c7334e4e8eafbb2872e5b6fdcf1.tar.gz | |
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
Diffstat (limited to 'include/motion_sense.h')
| -rw-r--r-- | include/motion_sense.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/motion_sense.h b/include/motion_sense.h index ed24f232fd..aa4170b722 100644 --- a/include/motion_sense.h +++ b/include/motion_sense.h @@ -187,6 +187,11 @@ void motion_sense_fifo_add_unit(struct ec_response_motion_sensor_data *data, #endif #ifdef CONFIG_ALS_LIGHTBAR_DIMMING +#ifdef TEST_BUILD +#define MOTION_SENSE_LUX 0 +#else #define MOTION_SENSE_LUX motion_sensors[CONFIG_ALS_LIGHTBAR_DIMMING].raw_xyz[0] #endif +#endif + #endif /* __CROS_EC_MOTION_SENSE_H */ |