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| author | Rob Barnes <robbarnes@google.com> | 2021-08-06 13:18:02 -0600 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-08-21 18:48:30 +0000 |
| commit | dd46fdb485a9cdb82ae733e4cec2320931e78dbc (patch) | |
| tree | 9b6e38ce3058b0575dc8d9eb80ad1b416d8c2cda /include | |
| parent | 1418bf3629b9fb767fca0a72455659bf46f06498 (diff) | |
| download | chrome-ec-dd46fdb485a9cdb82ae733e4cec2320931e78dbc.tar.gz | |
common: Add Milli Kelvin conversion macros
Add macros to convert to and from milli kelvin and various temperature
units. Utilize round_divide for more accurate conversions.
BUG=b:176994331
TEST=Unit test
BRANCH=None
Change-Id: Ie6750b9d2d2b8093fdf9c14f904382e91d8d95bb
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3078051
Reviewed-by: Keith Short <keithshort@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/common.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/include/common.h b/include/common.h index 03e1b19d55..373663ea88 100644 --- a/include/common.h +++ b/include/common.h @@ -218,8 +218,22 @@ /* There isn't really a better place for this */ #define C_TO_K(temp_c) ((temp_c) + 273) #define K_TO_C(temp_c) ((temp_c) - 273) -#define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731) -#define DECI_KELVIN_TO_CELSIUS(temp_dk) ((temp_dk - 2731) / 10) +/* + * round_divide is part of math_utils, so you may need to import math_utils.h + * and link math_utils.o if you use the following macros. + */ +#define CELSIUS_TO_DECI_KELVIN(temp_c) \ + (round_divide(CELSIUS_TO_MILLI_KELVIN(temp_c), 100)) +#define DECI_KELVIN_TO_CELSIUS(temp_dk) \ + (MILLI_KELVIN_TO_CELSIUS((temp_dk) * 100)) +#define MILLI_KELVIN_TO_MILLI_CELSIUS(temp_mk) ((temp_mk) - 273150) +#define MILLI_CELSIUS_TO_MILLI_KELVIN(temp_mc) ((temp_mc) + 273150) +#define MILLI_KELVIN_TO_KELVIN(temp_mk) (round_divide((temp_mk), 1000)) +#define KELVIN_TO_MILLI_KELVIN(temp_k) ((temp_k) * 1000) +#define CELSIUS_TO_MILLI_KELVIN(temp_c) \ + (MILLI_CELSIUS_TO_MILLI_KELVIN((temp_c) * 1000)) +#define MILLI_KELVIN_TO_CELSIUS(temp_mk) \ + (round_divide(MILLI_KELVIN_TO_MILLI_CELSIUS(temp_mk), 1000)) /* Calculate a value with error margin considered. For example, * TARGET_WITH_MARGIN(X, 5) returns X' where X' * 100.5% is almost equal to |