57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2021 Joey Castillo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <math.h>
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#include "watch_utility.h"
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const char * watch_utility_get_weekday(watch_date_time date_time) {
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static const char weekdays[7][3] = {"SA", "SU", "MO", "TU", "WE", "TH", "FR"};
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date_time.unit.year += 20;
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if (date_time.unit.month <= 2) {
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date_time.unit.month += 12;
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date_time.unit.year--;
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}
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return weekdays[(date_time.unit.day + 13 * (date_time.unit.month + 1) / 5 + date_time.unit.year + date_time.unit.year / 4 + 525) % 7];
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}
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float watch_utility_thermistor_temperature(uint16_t value, bool highside, float b_coefficient, float nominal_temperature, float nominal_resistance, float series_resistance) {
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float reading = (float)value;
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if (highside) {
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reading = (1023.0 * series_resistance) / (reading / 64.0);
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reading -= series_resistance;
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} else {
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reading = series_resistance / (65535.0 / value - 1.0);
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}
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reading = reading / nominal_resistance;
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reading = log(reading);
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reading /= b_coefficient;
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reading += 1.0 / (nominal_temperature + 273.15);
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reading = 1.0 / reading;
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reading -= 273.15;
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return reading;
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}
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