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0115834bb6
Add ability for Plankton to detect whether a single or double CC cable is used to connect to DUT. This is done by toggling the active CC line until a connection is detected, then toggling once more and checking if we still have a connection. If we can connect to the DUT in both CC polarities, then it is a double CC cable. Before we know the cable type, keep PD communication disabled to avoid partially negotiating and then disconnecting. Note, this increases the time it takes for us to connect a form a stable PD contract with the DUT. When we detect a double CC cable, the cable flip button actually flips the active CC polarity, thus testing all pins in the opposite polarity. BUG=chrome-os-partner:42569 BRANCH=smaug TEST=test with plankton and samus. test that we form a PD contract with both single and double CC cables as both sink and source. also test the cable flip button for both cables. Change-Id: I522369302848d4cdbb70c55a40af3ad0b7c3fb8a Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/286589 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit