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7be8ff812b
This code is used to find the orientation of the sensor. Given sensor are aligned with the edges of the device, it is not too dificult to find manually. BRANCH=ToT BUG=None TEST=Check ACCEL_CALIBRATE is not used anymore. Check 'make buildall -j' works. Change-Id: I81ffcb4f6b01c530ef16baf13113a5942f615092 Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/219527 Reviewed-by: Alec Berg <alecaberg@chromium.org>
52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Header file for common math functions. */
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#ifndef __CROS_MATH_UTIL_H
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#define __CROS_MATH_UTIL_H
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typedef float matrix_3x3_t[3][3];
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typedef int vector_3_t[3];
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/* Some useful math functions. */
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#define SQ(x) ((x) * (x))
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#define ABS(x) ((x) >= 0 ? (x) : -(x))
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/**
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* Find acos(x) in degrees. Argument is clipped to [-1.0, 1.0].
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*
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* @param x
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*
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* @return acos(x) in degrees.
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*/
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float arc_cos(float x);
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/**
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* Find the cosine of the angle between two vectors.
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*
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* @param v1
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* @param v2
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*
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* @return Cosine of the angle between v1 and v2.
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*/
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float cosine_of_angle_diff(const vector_3_t v1, const vector_3_t v2);
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/**
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* Rotate vector v by rotation matrix R.
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*
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* @param v Vector to be rotated.
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* @param R Rotation matrix.
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* @param res Resultant vector.
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*/
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void rotate(const vector_3_t v, const matrix_3x3_t R,
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vector_3_t res);
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#endif /* __CROS_MATH_UTIL_H */
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