Bidirectional test mode signaling over GPIO
* Implements a bidirectional synchronous handshake protocol over
dut_flaga/b GPIOs. This protocol is designed to return true (test
mode) only if the DUT is connected to a servo board which implements
the remote end.
* Includes unit tests for the test mode signaling routine, complete with
mock/fake implementation of the remote end.
Note that we still do not deploy GpioHandler in actual update
processing, which will be done later.
BUG=chromium-os:25397,chromium-os:27109,chromium-os:27672
TEST=Builds and passes unit tests (including new ones)
Change-Id: I265407ed735c3e1354e10782ac30566b16caeb20
Reviewed-on: https://gerrit.chromium.org/gerrit/23330
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Gilad Arnold <garnold@chromium.org>
9 files changed