tree 8ca093dd775c6cc3e171386b407e1ce29a63c28c
parent 4348879380222dc8c74b0976e527bf3da66ba08f
author Gilad Arnold <garnold@chromium.org> 1337294662 -0700
committer Gerrit <chrome-bot@google.com> 1341251621 -0700

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>