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add new sensor types for handling gyro data and device orientation more efficiently.

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Change-Id: I89faf5b3d57a3e726d1c347ce01d931b100188cd
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Kevin Powell 2010-07-19 19:12:15 -07:00 committed by Jean-Baptiste Queru
parent 76022c6f44
commit 4ec14c1e23
1 changed files with 39 additions and 0 deletions
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39
include/hardware/sensors.h
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@ -58,6 +58,9 @@ __BEGIN_DECLS
#define SENSOR_TYPE_PRESSURE 6
#define SENSOR_TYPE_TEMPERATURE 7
#define SENSOR_TYPE_PROXIMITY 8
#define SENSOR_TYPE_GRAVITY 9
#define SENSOR_TYPE_LINEAR_ACCELERATION 10
#define SENSOR_TYPE_ROTATION_VECTOR 11
/**
* Values returned by the accelerometer in various locations in the universe.
@ -186,6 +189,17 @@ __BEGIN_DECLS
* Magnetic Field sensors return sensor events for all 3 axes at a constant
* rate defined by setDelay().
*
* Gyroscope
* ---------
* All values are in radians/second and measure the rate of rotation
* around the X, Y and Z axis. The coordinate system is the same as is
* used for the acceleration sensor. Rotation is positive in the counter-clockwise
* direction. That is, an observer looking from some positive location on the x, y.
* or z axis at a device positioned on the origin would report positive rotation
* if the device appeared to be rotating counter clockwise. Note that this is the
* standard mathematical definition of positive rotation and does not agree with the
* definition of roll given earlier.
*
* Proximity
* ---------
*
@ -212,7 +226,32 @@ __BEGIN_DECLS
*
* Pressure sensors report events at a constant rate defined by setDelay().
*
* Gravity
* -------
* A gravity output indicates the direction of and magnitude of gravity in the devices's
* coordinates. On Earth, the magnitude is 9.8. Units are m/s^2. The coordinate system
* is the same as is used for the acceleration sensor.
*
* Linear Acceleration
* -------------------
* Indicates the linear acceleration of the device in device coordinates, not including gravity.
* This output is essentially Acceleration - Gravity. Units are m/s^2. The coordinate system is
* the same as is used for the acceleration sensor.
*
* Rotation Vector
* ---------------
* A rotation vector represents the orientation of the device as a combination
* of an angle and an axis, in which the device has rotated through an angle
* theta around an axis <x, y, z>. The three elements of the rotation vector
* are <x*sin(theta/2), y*sin(theta/2), z*sin(theta/2)>, such that the magnitude
* of the rotation vector is equal to sin(theta/2), and the direction of the
* rotation vector is equal to the direction of the axis of rotation. The three
* elements of the rotation vector are equal to the last three components of a
* unit quaternion <cos(theta/2), x*sin(theta/2), y*sin(theta/2), z*sin(theta/2)>.
* Elements of the rotation vector are unitless. The x, y, and z axis are defined
* in the same was as for the acceleration sensor.
*/
typedef struct {
union {
float v[3];