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828b55a735
Code for hard iron calibration: Every seconds (or faster if enough samples), find a sphere that fit the compass data. Based on Android code. BRANCH=smaug BUG=chrome-os-partner:39900 TEST=Check hard-iron bias is removed. Works better outside. Change-Id: Iab479d5113b6560b4f01b0fd87373d2eecdb9b54 Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/299583 Reviewed-by: Anton Staaf <robotboy@chromium.org>
18 lines
493 B
C
18 lines
493 B
C
/* Copyright 2015 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_EC_VEC_3_H
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#define __CROS_EC_VEC_3_H
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typedef float vec3_t[3];
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void vec3_scalar_mul(vec3_t v, float c);
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float vec3_dot(const vec3_t v, const vec3_t w);
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float vec3_norm_squared(const vec3_t v);
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float vec3_norm(const vec3_t v);
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#endif /* __CROS_EC_VEC_3_H */
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