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Add absolute threshold on delta_z_inner for tap for battery to guarantee that we have at least some minimum absolute change in z that has started the tap for battery. This change makes it such that if the accel readings are really steady for a while, then a sudden noisy signal doesn't trigger tap for battery. BUG=chrome-os-partner:34592 BRANCH=samus TEST=use tapinfo on to observe tap values and do a double tap of varying intensities. note that it should be just a little less sensitive to weak taps. Change-Id: I95367bc7f99b888e15e9ac3a2bc8c9cca32d30d6 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/237666 Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit