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/*
* MIT License
*
* Copyright (c) 2021 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _WATCH_UTILITY_H_INCLUDED
#define _WATCH_UTILITY_H_INCLUDED
////< @file watch_utility.h
#include "watch.h"
/** @addtogroup utility Utility Functions
* @brief This section covers various useful functions that don't fit anywhere else.
**/
/// @{
typedef struct {
uint8_t seconds; // 0-59
uint8_t minutes; // 0-59
uint8_t hours; // 0-23
uint32_t days; // 0-4294967295
} watch_duration_t;
/** @brief Returns a two-letter weekday for the given timestamp, suitable for display
* in positions 0-1 of the watch face
* @param date_time The watch_date_time whose weekday you want.
*/
const char * watch_utility_get_weekday(watch_date_time date_time);
/** @brief Returns the UNIX time (seconds since 1970) for a given date/time in UTC.
* @param date_time The watch_date_time that you wish to convert.
* @param year The year of the date you wish to convert.
* @param month The month of the date you wish to convert.
* @param day The day of the date you wish to convert.
* @param hour The hour of the date you wish to convert.
* @param minute The minute of the date you wish to convert.
* @param second The second of the date you wish to convert.
* @param utc_offset The number of seconds that date_time is offset from UTC, or 0 if the time is UTC.
* @return A UNIX timestamp for the given date/time and UTC offset.
* @note Implemented by Wesley Ellis (tahnok) and based on BSD-licensed code by Josh Haberman:
* https://blog.reverberate.org/2020/05/12/optimizing-date-algorithms.html
*/
uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second, uint32_t utc_offset);
/** @brief Returns the UNIX time (seconds since 1970) for a given watch_date_time struct.
* @param date_time The watch_date_time that you wish to convert.
* @param utc_offset The number of seconds that date_time is offset from UTC, or 0 if the time is UTC.
* @return A UNIX timestamp for the given watch_date_time and UTC offset.
*/
uint32_t watch_utility_date_time_to_unix_time(watch_date_time date_time, uint32_t utc_offset);
/** @brief Converts a duration in seconds to a watch_duration_t struct.
* @param seconds A positive number of seconds that you wish to convert to a formatted duration.
* @return A populated struct with the number of days, hours, minutes and seconds elapsed.
*/
watch_duration_t watch_utility_seconds_to_duration(uint32_t seconds);
/** @brief Returns a watch_date_time struct for a given UNIX time and UTC offset.
* @param timestamp The UNIX timestamp that you wish to convert.
* @param utc_offset The number of seconds that you wish date_time to be offset from UTC.
* @return A watch_date_time for the given UNIX timestamp and UTC offset, or if outside the range that
* watch_date_time can represent, a watch_date_time with all fields set to 0.
* @note Adapted from MIT-licensed code from musl, Copyright © 2005-2014 Rich Felker, et al.:
* https://github.com/esmil/musl/blob/1cc81f5cb0df2b66a795ff0c26d7bbc4d16e13c6/src/time/__secs_to_tm.c
*/
watch_date_time watch_utility_date_time_from_unix_time(uint32_t timestamp, uint32_t utc_offset);
/** @brief Converts a watch_date_time for 12-hour display.
* @param date_time A pointer to the watch_date_time that you wish to convert for display. Note that this
* function will OVERWRITE the original date/time, rendering it invalid for date/time
* calculations. Midnight (hour 0) will become 12, and hours in the afternoon will wrap
* back around to values from 1-11.
* @return True if the value is in the afternoon. You can use this value to determine whether to set the
* PM indicator on the LCD.
* @note This function sort of abuses the watch_date_time struct; the date/time that results from calling
* this function is clamped to the hours of 1:00:00 AM through 12:59:59 PM. It no longer reflects a
* valid watch_date_time for writing to an RTC register.
*/
bool watch_utility_convert_to_12_hour(watch_date_time *date_time);
/** @brief Converts a time from a given time zone to another time zone.
* @param date_time The watch_date_time that you wish to convert
* @param origin_utc_offset The number of seconds from UTC in the origin time zone
* @param destination_utc_offset The number of seconds from UTC in the destination time zone
* @return A watch_date_time for the given UNIX timestamp and UTC offset, or if outside the range that
* watch_date_time can represent, a watch_date_time with all fields set to 0.
* @note Adapted from MIT-licensed code from musl, Copyright © 2005-2014 Rich Felker, et al.:
* https://github.com/esmil/musl/blob/1cc81f5cb0df2b66a795ff0c26d7bbc4d16e13c6/src/time/__secs_to_tm.c
*/
watch_date_time watch_utility_date_time_convert_zone(watch_date_time date_time, uint32_t origin_utc_offset, uint32_t destination_utc_offset);
/** @brief Returns a temperature in degrees Celsius for a given thermistor voltage divider circuit.
* @param value The raw analog reading from the thermistor pin (0-65535)
* @param highside True if the thermistor is connected to VCC and the series resistor is connected
* to GND; false if the thermistor is connected to GND and the series resistor is
* connected to VCC.
* @param b_coefficient From your thermistor's data sheet, the B25/85 coefficient. A typical value
* will be between 2000 and 5000.
* @param nominal_temperature From your thermistor's data sheet, the temperature (in Celsius) at
* which the thermistor's resistance is at its nominal value.
* @param nominal_resistance The thermistor's resistance at the nominal temperature.
* @param series_resistance The value of the other resistor in the voltage divider.
* @note Ported from Adafruit's MIT-licensed CircuitPython thermistor code, (c) 2017 Scott Shawcroft:
* https://github.com/adafruit/Adafruit_CircuitPython_Thermistor/blob/main/adafruit_thermistor.py
*/
float watch_utility_thermistor_temperature(uint16_t value, bool highside, float b_coefficient, float nominal_temperature, float nominal_resistance, float series_resistance);
/** @brief Offset a timestamp by a given amount
* @param now Timestamp to offset from
* @param hours Number of hours to offset
* @param minutes Nmber of minutes to offset
* @param seconds Number of secodns to offset
*/
uint32_t watch_utility_offset_timestamp(uint32_t now, int8_t hours, int8_t minutes, int8_t seconds);
#endif
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