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08081ee2dc
This fixes a bug where we were reading the CC line ADC without disabling the adc watchdog, which caused misreads. Instead, I changed adc_read_channel so that every ADC read disables and restores the ADC watchdog. BUG=chrome-os-partner:31454 BRANCH=none TEST=tested on EVT zinger. Added debug code to print out CC line voltage after reading it in usb_pd_protocol.c. Before the change the CC voltage is mostly wrong, unless you read the ADC twice back to back and look at the second read value. After this change, the CC voltage ADC reading always matches the real voltage. Change-Id: I9d3aa02b3d22defb9cf6f5a866de2b846a6b8a35 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/213253 Reviewed-by: Todd Broch <tbroch@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit