mirror of https://github.com/ARMmbed/mbed-os.git
132 lines
4.9 KiB
C
132 lines
4.9 KiB
C
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/** \addtogroup platform */
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/** @{*/
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/* mbed Microcontroller Library
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* Copyright (c) 2017-2017 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_MKTIME_H
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#define MBED_MKTIME_H
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#include <time.h>
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \defgroup platform_mktime mktime functions
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* @{
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*/
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/* Time range across the whole 32-bit range should be supported which means that years in range 1970 - 2106 can be
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* encoded. We have two types of RTC devices:
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* a) RTCs which handles all leap years in the mentioned year range correctly. Leap year is determined by checking if
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* the year counter value is divisible by 400, 100, and 4. No problem here.
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* b) RTCs which handles leap years correctly up to 2100. The RTC does a simple bit comparison to see if the two
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* lowest order bits of the year counter are zero. In this case 2100 year will be considered
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* incorrectly as a leap year, so the last valid point in time will be 28.02.2100 23:59:59 and next day will be
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* 29.02.2100 (invalid). So after 28.02.2100 the day counter will be off by a day.
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*/
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typedef enum {
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RTC_FULL_LEAP_YEAR_SUPPORT,
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RTC_4_YEAR_LEAP_YEAR_SUPPORT
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} rtc_leap_year_support_t;
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/** Compute if a year is a leap year or not.
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*
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* @param year The year to test it shall be in the range [70:206]. Year 0 is
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* translated into year 1900 CE.
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* @param leap_year_support use RTC_FULL_LEAP_YEAR_SUPPORT if RTC device is able
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* to correctly detect all leap years in range [70:206] otherwise use RTC_4_YEAR_LEAP_YEAR_SUPPORT.
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*
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* @return true if the year in input is a leap year and false otherwise.
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*
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* @note For use by the HAL only
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* @note Year 2100 is treated differently for devices with full leap year support and devices with
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* partial leap year support. Devices with partial leap year support treats 2100 as a leap year.
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*/
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bool _rtc_is_leap_year(int year, rtc_leap_year_support_t leap_year_support);
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/* Convert a calendar time into time since UNIX epoch as a time_t.
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*
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* This function is a thread safe (partial) replacement for mktime. It is
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* tailored around RTC peripherals needs and is not by any mean a complete
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* replacement of mktime.
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*
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* @param time The calendar time to convert into a time_t since epoch.
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* The fields from tm used for the computation are:
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* - tm_sec
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* - tm_min
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* - tm_hour
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* - tm_mday
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* - tm_mon
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* - tm_year
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* Other fields are ignored and won't be renormalized by a call to this function.
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* A valid calendar time is comprised between:
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* the 1st of January 1970 at 00:00:00 to the 7th of February 2106 at 06:28:15.
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* @param leap_year_support use RTC_FULL_LEAP_YEAR_SUPPORT if RTC device is able
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* to correctly detect all leap years in range [70:206] otherwise use RTC_4_YEAR_LEAP_YEAR_SUPPORT.
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* @param seconds holder for the result - calendar time as seconds since UNIX epoch.
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*
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* @return true on success, false if conversion error occurred.
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*
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* @note Leap seconds are not supported.
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* @note Values in output range from 0 to UINT_MAX.
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* @note Full and partial leap years support.
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* @note For use by the HAL only
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*/
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bool _rtc_maketime(const struct tm* time, time_t * seconds, rtc_leap_year_support_t leap_year_support);
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/* Convert a given time in seconds since epoch into calendar time.
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*
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* This function is a thread safe (partial) replacement for localtime. It is
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* tailored around RTC peripherals specification and is not by any means a
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* complete of localtime.
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*
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* @param timestamp The time (in seconds) to convert into calendar time. Valid
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* input are in the range [0 : UINT32_MAX].
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* @param calendar_time Pointer to the object which will contain the result of
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* the conversion. The tm fields filled by this function are:
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* - tm_sec
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* - tm_min
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* - tm_hour
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* - tm_mday
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* - tm_mon
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* - tm_year
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* - tm_wday
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* - tm_yday
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* The object remains untouched if the time in input is invalid.
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* @param leap_year_support use RTC_FULL_LEAP_YEAR_SUPPORT if RTC device is able
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* to correctly detect all leap years in range [70:206] otherwise use RTC_4_YEAR_LEAP_YEAR_SUPPORT.
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* @return true if the conversion was successful, false otherwise.
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*
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* @note For use by the HAL only.
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* @note Full and partial leap years support.
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*/
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bool _rtc_localtime(time_t timestamp, struct tm* time_info, rtc_leap_year_support_t leap_year_support);
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/** @}*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBED_MKTIME_H */
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/** @}*/
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