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When reading, the line must be sampled in a narrow timing window after the output pulse. Interrupts or context switches during this time corrupt the data. Similarly, when writing, the difference between a 0-bit and a 1-bit is the length of the output pulse. So a context switch or interrupt there can turn a 1-bit into a 0-bit. BUG=chrome-os-partner:15507 BRANCH=link TEST=manual 0. plug in AC power 1. hold down shift key for the duration of this test 2. powerled yellow 3. powerled red 4. repeat steps 2-3 several times 5. release shift key Power adapter LED should toggle color each time. (It may also toggle to the normally expected color during this experiment, if the charging task updates it.) Power adapter LED should NOT turn off during this test. Change-Id: Ief11e6e9a5b07aa3a25c60c50e4e7744a4705713 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/38925 Reviewed-by: Yung-Chieh Lo <yjlou@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>