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| author | Aseda Aboagye <aaboagye@google.com> | 2021-02-09 14:59:09 -0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-02-10 00:20:32 +0000 |
| commit | 2875dd8dd9920954f8c40621e9453d3b2e4bfc82 (patch) | |
| tree | b5ef13b6d170401779d754193fac493e4e696f54 /include/ec_commands.h | |
| parent | 07675ded17776492ceb1100c59d932439e71f0d0 (diff) | |
| download | chrome-ec-2875dd8dd9920954f8c40621e9453d3b2e4bfc82.tar.gz | |
ocpc: Raise resistance calc current threshold
One of the chargers used in OCPC systems has an ADC resolution of
96mV. This causes an issue when the voltage delta that is used for
the resistance calculation is smaller than this value as this can lead
to a value of 0 resistance. When the battery is charged at a high
enough current, there's enough of a voltage drop such that the delta
exceeds the ADC LSB.
This commit simply raises the threshold at which resistance is
calculated in system to 1666mA such that the voltage delta exceeds the
LSB of the charger IC's LSB.
BUG=b:175063397
BRANCH=dedede
TEST=Build and flash madoo. Charge from sub board, verify that once
charging current exceeds 1666mA, resistance is calculated. Verify
that the calculated system resistance is non-zero.
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Idfe5a4858f9915b54ad7b095c2972597909f97a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2686256
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Auto-Submit: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>
Commit-Queue: Diana Z <dzigterman@chromium.org>
Diffstat (limited to 'include/ec_commands.h')
0 files changed, 0 insertions, 0 deletions