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| author | Gwendal Grignou <gwendal@chromium.org> | 2015-07-12 22:26:33 -0700 |
|---|---|---|
| committer | ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> | 2015-07-22 23:50:31 +0000 |
| commit | 709676bfe1dacc42395d7ba658fcc23455e6d7a0 (patch) | |
| tree | b3436d6c3d9dc620eac18d4935ef0778fb5ccf0c /driver/mag_bmm150.h | |
| parent | d286fbd7f8a0b94a5d3a022a4cfc679f9f76a357 (diff) | |
| download | chrome-ec-709676bfe1dacc42395d7ba658fcc23455e6d7a0.tar.gz | |
driver: bmm150 measurement compensation
Using Bosh reference document, compensate X,Y,Z axis
based on internal registers and R HALL values.
Change compass unites to 1/16 uT per LSB.
Reference:
https://github.com/suribi/Thunder-Kernel/blob/master/mediatek/custom/common/kernel/magnetometer/bmm150/bmm150.c
BRANCH=smaug
TEST=Check compass value in user space.
BUG=chrome-os-partner:39900
Change-Id: I0c480521771ef6004ac6e5182cc1d27e82c5bc7c
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/285020
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Diffstat (limited to 'driver/mag_bmm150.h')
| -rw-r--r-- | driver/mag_bmm150.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/driver/mag_bmm150.h b/driver/mag_bmm150.h index 27ca5aebb6..6ae8e679b9 100644 --- a/driver/mag_bmm150.h +++ b/driver/mag_bmm150.h @@ -34,4 +34,58 @@ #define BMM150_INT_CTRL 0x4d +/* Hidden registers for RHALL calculation */ + +#define BMM150_REGA_DIG_X1 0x5d +#define BMM150_REGA_DIG_Y1 0x5e +#define BMM150_REGA_DIG_Z4_LSB 0x62 +#define BMM150_REGA_DIG_Z4_MSB 0x63 +#define BMM150_REGA_DIG_X2 0x64 +#define BMM150_REGA_DIG_Y2 0x65 +#define BMM150_REGA_DIG_Z2_LSB 0x68 +#define BMM150_REGA_DIG_Z2_MSB 0x69 +#define BMM150_REGA_DIG_Z1_LSB 0x6a +#define BMM150_REGA_DIG_Z1_MSB 0x6b +#define BMM150_REGA_DIG_XYZ1_LSB 0x6c +#define BMM150_REGA_DIG_XYZ1_MSB 0x6d +#define BMM150_REGA_DIG_Z3_LSB 0x6e +#define BMM150_REGA_DIG_Z3_MSB 0x6f +#define BMM150_REGA_DIG_XY2 0x70 +#define BMM150_REGA_DIG_XY1 0x71 + +/* Overflow */ + +#define BMM150_FLIP_OVERFLOW_ADCVAL (-4096) +#define BMM150_HALL_OVERFLOW_ADCVAL (-16384) +#define BMM150_OVERFLOW_OUTPUT (0x8000) + + +struct bmm150_comp_registers { + /* Local copy of the compensation registers. */ + int8_t dig1[2]; + int8_t dig2[2]; + + uint16_t dig_z1; + int16_t dig_z2; + int16_t dig_z3; + int16_t dig_z4; + + uint8_t dig_xy1; + int8_t dig_xy2; + + uint16_t dig_xyz1; +}; + +#define BMM150_COMP_REG(_s) \ + (&BMI160_GET_DATA(_s)->comp_regs) + +/* Specific initialization of BMM150 when behing BMI160 */ +int bmm150_init(const struct motion_sensor_t *s); + +/* Command to normalize and apply temperature compensation */ +void bmm150_normalize(const struct motion_sensor_t *s, + vector_3_t v, + uint8_t *data); + + #endif /* __CROS_EC_MAG_BMM150_H */ |