diff options
| author | Gwendal Grignou <gwendal@chromium.org> | 2015-09-11 12:02:26 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2015-10-13 05:28:54 -0700 |
| commit | 828b55a7358ad5ec8bc27552bfb280eb173dd453 (patch) | |
| tree | b9430d2bf624ee2b6976eed211696b50ae56decb /core | |
| parent | 0647f66f81de880af603a7fb70f57159519782ac (diff) | |
| download | chrome-ec-828b55a7358ad5ec8bc27552bfb280eb173dd453.tar.gz | |
common: Add magnetometer online calibration.
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>
Diffstat (limited to 'core')
| -rw-r--r-- | core/cortex-m/include/math.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/core/cortex-m/include/math.h b/core/cortex-m/include/math.h index fbcd06e233..ac6acf1ef0 100644 --- a/core/cortex-m/include/math.h +++ b/core/cortex-m/include/math.h @@ -19,6 +19,17 @@ static inline float sqrtf(float v) ); return root; } + +static inline float fabsf(float v) +{ + float root; + asm volatile( + "fabss %0, %1" + : "=w" (root) + : "w" (v) + ); + return root; +} #endif /* CONFIG_FPU */ #endif /* __CROS_EC_MATH_H */ |