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fd6a6900f7
Motion sense calculations do not require huge amounts of precision, so
fixed point is plenty accurate. And fixed point works on Cortex-M0,
which lacks a FPU.
BUG=chrome-os-partner:36126
BRANCH=minnie (samus already works with the FPU, but could grab this if we
want additional testing)
TEST=manual
1. Boot system
2. At EC console: accelinfo on 250
3. Move lid through several different angles (30 degrees to max open) and
see that it updates correctly and relatively smoothly. A few degrees
of angle jitter is normal.
4. At several angles, rotate the chromebook around and see that the lid
angle remains relatively stable.
5. If the hinge is made normal to the ground (or within 15 degrees of
vertical), the angle should read 500, since the acceleration vectors
don't yield good results in that orientation (for either fixed or float
math).
And run 'make buildall -j', which tests arc_cos() and lid angle calculations
Change-Id: I70a0d08b8914629a3e21ae5578cbe8e50f29ad68
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/244116
Reviewed-by: Alec Berg <alecaberg@chromium.org>
29 lines
876 B
C
29 lines
876 B
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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/* Lid angle module for Chrome EC */
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#ifndef __CROS_EC_LID_ANGLE_H
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#define __CROS_EC_LID_ANGLE_H
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/**
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* Update the lid angle module with the most recent lid angle calculation. Then
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* use the lid angle history to enable/disable keyboard scanning when chipset
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* is suspended.
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*
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* @lid_ang Lid angle.
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*/
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void lidangle_keyscan_update(int lid_ang);
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/**
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* Getter and setter methods for the keyboard wake angle. In S3, when the
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* lid angle is greater than this value, the keyboard is disabled, and when
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* the lid angle is smaller than this value, the keyboard is enabled.
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*/
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int lid_angle_get_kb_wake_angle(void);
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void lid_angle_set_kb_wake_angle(int ang);
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#endif /* __CROS_EC_LID_ANGLE_H */
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