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The device state machines aren't quite similar enough to use common code. Split the EC state machine out, the way we split out BattPrsnt and CCD_MODE. BUG=b:35587387 BRANCH=cr50 TEST=manual Pull CCD_MODE_L high, so Cr50 detects/enables CCD Pull EC_DETECT high. reboot -> 'EC RX only', then 'EC on' at 1 second Pull EC_DETECT low --> See 'EC off' message ccd --> EC UART disabled Pull EC_DETECT high --> See 'EC on' message ccd --> EC UART RX+TX Pull EC_DETECT low for <1 sec then back high (don't see EC off/on messages) ccd --> EC UART RX+TX Reboot with EC_DETECT still low -> EC off at 1 second Reboot with EC_DETECT still low and then assert EC_DETECT within a second -> EC RX only, then EC connect at 1 second. Change-Id: I71687e651d625cadd656934f4cb2bbadc0b58816 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/619750 Reviewed-by: Mary Ruthven <mruthven@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly