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| author | Mathias Agopian <mathias@google.com> | 2011-05-03 15:36:17 -0700 |
|---|---|---|
| committer | Android (Google) Code Review <android-gerrit@google.com> | 2011-05-03 15:36:17 -0700 |
| commit | bbc13bc837e0d7679f593056420b2b6c5de21b57 (patch) | |
| tree | 72df1a6b79d9c2de3ef170b40f7040d6c412ab3e /include | |
| parent | 1ca194d2d4415afbb946d67ae9993b48e74057ef (diff) | |
| parent | d93ff971bd507e92ac81c149079906d2123795af (diff) | |
| download | hardware_libhardware-bbc13bc837e0d7679f593056420b2b6c5de21b57.zip hardware_libhardware-bbc13bc837e0d7679f593056420b2b6c5de21b57.tar.gz hardware_libhardware-bbc13bc837e0d7679f593056420b2b6c5de21b57.tar.bz2 | |
Merge "Improve ROTATION_VECTOR sensor documentation"
Diffstat (limited to 'include')
| -rw-r--r-- | include/hardware/sensors.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/hardware/sensors.h b/include/hardware/sensors.h index fb83c3f..9c2aa2a 100644 --- a/include/hardware/sensors.h +++ b/include/hardware/sensors.h @@ -268,6 +268,18 @@ __BEGIN_DECLS * Elements of the rotation vector are unitless. The x, y, and z axis are defined * in the same was as for the acceleration sensor. * + * The reference coordinate system is defined as a direct orthonormal basis, + * where: + * + * - X is defined as the vector product Y.Z (It is tangential to + * the ground at the device's current location and roughly points East). + * + * - Y is tangential to the ground at the device's current location and + * points towards the magnetic North Pole. + * + * - Z points towards the sky and is perpendicular to the ground. + * + * * The rotation-vector is stored as: * * sensors_event_t.data[0] = x*sin(theta/2) |