diff options
| author | Nick Vaccaro <nvaccaro@google.com> | 2019-06-25 17:38:37 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-08-20 16:31:49 +0000 |
| commit | 8aaeb9fd05ab185a7807f3650e491d2c3042637a (patch) | |
| tree | 1ea559dd616d2f4e389ede9d33890540393ccb49 /driver/als_tcs3400.h | |
| parent | 8b07b326496025530911f63b220fa987f1950f06 (diff) | |
| download | chrome-ec-8aaeb9fd05ab185a7807f3650e491d2c3042637a.tar.gz | |
driver/tcs3400: improve efficiency of auto-adjust
Adds an array which holds the number of atime increments needed
at various lux levels and again settings to change delta from
saturation by 1%. Using this table, the anti-saturation
algorithm can get to the 90% band in most cases in a single
adjustment vs the 10 to 15 adjustments previously needed when
not using this table.
Enabling CONFIG_TCS_USE_LUX_TABLES takes up 280 bytes in the
ec.obj.
BUG=b:124512628
BRANCH=master
TEST=Flash and boot flapjack, verify that ALS and RGB sensors
are still generating data. I used alslog patch and enabled
ALS logging in EC console via "alslog 2047". Verify that under
a constant light source, the adjustment mechanism correctly drives
the ALS values such that they land in the sweet spot between 90
to <100% of saturation.
Change-Id: I7cd0b8242e72233f50ff2751834f7bba367c6706
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1677764
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Diffstat (limited to 'driver/als_tcs3400.h')
| -rw-r--r-- | driver/als_tcs3400.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/driver/als_tcs3400.h b/driver/als_tcs3400.h index eace416c94..9681a39a56 100644 --- a/driver/als_tcs3400.h +++ b/driver/als_tcs3400.h @@ -97,6 +97,11 @@ enum tcs3400_mode { #define TCS_CALIBRATION_ATIME TCS_MIN_ATIME #define TCS_GAIN_UPSHIFT_ATIME TCS_MAX_ATIME +/* Number of different ranges supported for atime adjustment support */ +#define TCS_MAX_ATIME_RANGES 13 +#define TCS_GAIN_TABLE_MAX_LUX 12999 +#define TCS_ATIME_GAIN_FACTOR 100 /* table values are 100x actual value */ + #define TCS_MIN_AGAIN 0x00 /* 1x gain */ #define TCS_MAX_AGAIN 0x03 /* 64x gain */ #define TCS_CALIBRATION_AGAIN 0x02 /* 16x gain */ |