tree 2e9da73ff8d2b5ee62132b5974c99426130522dd
parent 5a905c0297eb20b2db96f1e7f9ef7ed3c63e45cc
author Christopher Buck <cmbuck@google.com> 1728507874 -0700
committer Brian Nemec <bnemec@google.com> 1729290048 +0000

Twinkie v2: Changes to support Twinkie v2.1 HW design.

1) Removes the 1.22 magic number multiplier.  This was originally added
   to compensate for bias caused by the ADC sampling capacitor.
   Now that we have a input cap on the ADC pin, we use the true ADC value.
2) CC_EN lines are now active low
3) VBUS voltage calibration is no longer run on each sample
4) VBUS oversampling is enabled for better accuracy (more effective ADC bits)

BUG=b:287131048

TEST=build and flash the image.  Validate Twinkie v2.1 reports expected
     measurement values, especially for VBUS, CC1, and CC2
    `west build -p always twinkie_v2`
    `sudo dfu-util -a 0 -s 0x8000000:leave -D build/zephyr/zephyr.bin`

Change-Id: I4c7c06fd4a3cd2fb250d8b33890a1664e9dddb00
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/hdctools_firmware/+/5924152
Auto-Submit: Christopher Buck <cmbuck@google.com>
Tested-by: Christopher Buck <cmbuck@google.com>
Reviewed-by: Brian Nemec <bnemec@google.com>
Reviewed-by: zhi cheng yuan <jasonyuan@chromium.org>