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Rewording of tilt sensor

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Change-Id: I7bb0e63c3e1e6850359d7e690bfeea9e8c8fbcbf
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Etienne Le Grand
2014-05-29 19:35:48 -07:00
parent 53017efa7b
commit 426f14df08
1 changed files with 2 additions and 2 deletions
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4
include/hardware/sensors.h
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@@ -522,11 +522,11 @@ enum {
* A sensor of this type generates an event each time a tilt event is detected. A tilt event
* should be generated if the direction of the 2-seconds window average gravity changed by at least
* 35 degrees since the activation or the last trigger of the sensor.
* initial_estimated_gravity = average of accelerometer measurements over the first
* reference_estimated_gravity = average of accelerometer measurements over the first
* 1 second after activation or the estimated gravity at the last
* trigger.
* current_estimated_gravity = average of accelerometer measurements over the last 2 seconds.
* trigger when angle (initial_estimated_gravity, current_estimated_gravity) > 35 degrees
* trigger when angle (reference_estimated_gravity, current_estimated_gravity) > 35 degrees
*
* Large accelerations without a change in phone orientation should not trigger a tilt event.
* For example, a sharp turn or strong acceleration while driving a car should not trigger a tilt