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This commit increases the precision used in the noisy magnitude deviation check by multiplying the scaled sensor data by 8 in the intermediate calculations. Prior to this, due to some bits being lost, certain devices would determine the lid angle as unreliable in specific angles, even though the device was at rest. BUG=b:63148973 BRANCH=eve,gru,reef TEST=Flash bob, set DUT on desk, run `while true; do ectool motionsense lid_angle; sleep 0.1; done`, slowly move the lid from 15 degrees until ~350. Verify that no particular angle results in a unreliable lid angle reading. TEST=Run `evtest` and examing cros-ec-buttons, fold screen all the way back to make tablet mode, shake device for at least 30s. Verify that there are no spurious transitions of the tablet mode switch. TEST=Repeat above tests on kevin. Change-Id: Iff06c1df2dd33c60e26a59183f62f29b71548729 Signed-off-by: Aseda Aboagye <aaboagye@google.com> Reviewed-on: https://chromium-review.googlesource.com/567050 Commit-Ready: Aseda Aboagye <aaboagye@chromium.org> Tested-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly