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The timer test checks the accuracy of the internal timer. After sync, DUT and TH start counting down one second. After one second, DUT raises GPIO level. TH determines whether the test passes or not based on how much more or less time elapsed than one second, assuming its clock is calibrated. This test takes advantage of TH running on a bare chip. If the host were measuring (instead of TH), the timing would be affected by many software and hardware layers (e.g. UART drivers on DUT and host, python interpreter, etc.). BUG=chromium:624520 BRANCH=none TEST=cts.py --module timer && cts.py --module gpio && make buildall Change-Id: I535e7772b4d93f1f5d248506f7ea167429a50174 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/361384
The first time you use this with a particular th, connect only th and run ./cts/cts.py --th from the ec directory. Then connect both boards and you can run ./cts/cts to flash both boards.