takashi kadono / Mbed OS Nucleo_446

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/platform/mbed_mktime.c@3:f3764f852aa8, 2018-10-11 (annotated)

Committer:
kadonotakashi
Date:
Thu Oct 11 02:27:46 2018 +0000
Revision:
3:f3764f852aa8
Parent:
0:8fdf9a60065b 
Nucreo 446 + SSD1331 test version;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /* mbed Microcontroller Library
kadonotakashi 0:8fdf9a60065b 2 * Copyright (c) 2017-2017 ARM Limited
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Licensed under the Apache License, Version 2.0 (the "License");
kadonotakashi 0:8fdf9a60065b 5 * you may not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 6 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 7 *
kadonotakashi 0:8fdf9a60065b 8 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 9 *
kadonotakashi 0:8fdf9a60065b 10 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 11 * distributed under the License is distributed on an "AS IS" BASIS,
kadonotakashi 0:8fdf9a60065b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 13 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 14 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 15 */
kadonotakashi 0:8fdf9a60065b 16
kadonotakashi 0:8fdf9a60065b 17 #include "mbed_mktime.h"
kadonotakashi 0:8fdf9a60065b 18
kadonotakashi 0:8fdf9a60065b 19 /* Time constants. */
kadonotakashi 0:8fdf9a60065b 20 #define SECONDS_BY_MINUTES 60
kadonotakashi 0:8fdf9a60065b 21 #define MINUTES_BY_HOUR 60
kadonotakashi 0:8fdf9a60065b 22 #define SECONDS_BY_HOUR (SECONDS_BY_MINUTES * MINUTES_BY_HOUR)
kadonotakashi 0:8fdf9a60065b 23 #define HOURS_BY_DAY 24
kadonotakashi 0:8fdf9a60065b 24 #define SECONDS_BY_DAY (SECONDS_BY_HOUR * HOURS_BY_DAY)
kadonotakashi 0:8fdf9a60065b 25 #define LAST_VALID_YEAR 206
kadonotakashi 0:8fdf9a60065b 26
kadonotakashi 0:8fdf9a60065b 27 /* Macros which will be used to determine if we are within valid range. */
kadonotakashi 0:8fdf9a60065b 28 #define EDGE_TIMESTAMP_FULL_LEAP_YEAR_SUPPORT 3220095 // 7th of February 1970 at 06:28:15
kadonotakashi 0:8fdf9a60065b 29 #define EDGE_TIMESTAMP_4_YEAR_LEAP_YEAR_SUPPORT 3133695 // 6th of February 1970 at 06:28:15
kadonotakashi 0:8fdf9a60065b 30
kadonotakashi 0:8fdf9a60065b 31 /*
kadonotakashi 0:8fdf9a60065b 32 * 2 dimensional array containing the number of seconds elapsed before a given
kadonotakashi 0:8fdf9a60065b 33 * month.
kadonotakashi 0:8fdf9a60065b 34 * The second index map to the month while the first map to the type of year:
kadonotakashi 0:8fdf9a60065b 35 * - 0: non leap year
kadonotakashi 0:8fdf9a60065b 36 * - 1: leap year
kadonotakashi 0:8fdf9a60065b 37 */
kadonotakashi 0:8fdf9a60065b 38 static const uint32_t seconds_before_month[2][12] = {
kadonotakashi 0:8fdf9a60065b 39 {
kadonotakashi 0:8fdf9a60065b 40 0,
kadonotakashi 0:8fdf9a60065b 41 31 * SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 42 (31 + 28) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 43 (31 + 28 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 44 (31 + 28 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 45 (31 + 28 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 46 (31 + 28 + 31 + 30 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 47 (31 + 28 + 31 + 30 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 48 (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 49 (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 50 (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 51 (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 52 },
kadonotakashi 0:8fdf9a60065b 53 {
kadonotakashi 0:8fdf9a60065b 54 0,
kadonotakashi 0:8fdf9a60065b 55 31 * SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 56 (31 + 29) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 57 (31 + 29 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 58 (31 + 29 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 59 (31 + 29 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 60 (31 + 29 + 31 + 30 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 61 (31 + 29 + 31 + 30 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 62 (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 63 (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 64 (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 65 (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30) *SECONDS_BY_DAY,
kadonotakashi 0:8fdf9a60065b 66 }
kadonotakashi 0:8fdf9a60065b 67 };
kadonotakashi 0:8fdf9a60065b 68
kadonotakashi 0:8fdf9a60065b 69 bool _rtc_is_leap_year(int year, rtc_leap_year_support_t leap_year_support)
kadonotakashi 0:8fdf9a60065b 70 {
kadonotakashi 0:8fdf9a60065b 71 /*
kadonotakashi 0:8fdf9a60065b 72 * since in practice, the value manipulated by this algorithm lie in the
kadonotakashi 0:8fdf9a60065b 73 * range: [70 : 206] the algorithm can be reduced to: year % 4 with exception for 200 (year 2100 is not leap year).
kadonotakashi 0:8fdf9a60065b 74 * The algorithm valid over the full range of value is:
kadonotakashi 0:8fdf9a60065b 75
kadonotakashi 0:8fdf9a60065b 76 year = 1900 + year;
kadonotakashi 0:8fdf9a60065b 77 if (year % 4) {
kadonotakashi 0:8fdf9a60065b 78 return false;
kadonotakashi 0:8fdf9a60065b 79 } else if (year % 100) {
kadonotakashi 0:8fdf9a60065b 80 return true;
kadonotakashi 0:8fdf9a60065b 81 } else if (year % 400) {
kadonotakashi 0:8fdf9a60065b 82 return false;
kadonotakashi 0:8fdf9a60065b 83 }
kadonotakashi 0:8fdf9a60065b 84 return true;
kadonotakashi 0:8fdf9a60065b 85
kadonotakashi 0:8fdf9a60065b 86 */
kadonotakashi 0:8fdf9a60065b 87 if (leap_year_support == RTC_FULL_LEAP_YEAR_SUPPORT && year == 200) {
kadonotakashi 0:8fdf9a60065b 88 return false; // 2100 is not a leap year
kadonotakashi 0:8fdf9a60065b 89 }
kadonotakashi 0:8fdf9a60065b 90
kadonotakashi 0:8fdf9a60065b 91 return (year) % 4 ? false : true;
kadonotakashi 0:8fdf9a60065b 92 }
kadonotakashi 0:8fdf9a60065b 93
kadonotakashi 0:8fdf9a60065b 94 bool _rtc_maketime(const struct tm *time, time_t *seconds, rtc_leap_year_support_t leap_year_support)
kadonotakashi 0:8fdf9a60065b 95 {
kadonotakashi 0:8fdf9a60065b 96 if (seconds == NULL || time == NULL) {
kadonotakashi 0:8fdf9a60065b 97 return false;
kadonotakashi 0:8fdf9a60065b 98 }
kadonotakashi 0:8fdf9a60065b 99
kadonotakashi 0:8fdf9a60065b 100 /* Partial check for the upper bound of the range - check years only. Full check will be performed after the
kadonotakashi 0:8fdf9a60065b 101 * elapsed time since the beginning of the year is calculated.
kadonotakashi 0:8fdf9a60065b 102 */
kadonotakashi 0:8fdf9a60065b 103 if ((time->tm_year < 70) || (time->tm_year > LAST_VALID_YEAR)) {
kadonotakashi 0:8fdf9a60065b 104 return false;
kadonotakashi 0:8fdf9a60065b 105 }
kadonotakashi 0:8fdf9a60065b 106
kadonotakashi 0:8fdf9a60065b 107 uint32_t result = time->tm_sec;
kadonotakashi 0:8fdf9a60065b 108 result += time->tm_min * SECONDS_BY_MINUTES;
kadonotakashi 0:8fdf9a60065b 109 result += time->tm_hour * SECONDS_BY_HOUR;
kadonotakashi 0:8fdf9a60065b 110 result += (time->tm_mday - 1) * SECONDS_BY_DAY;
kadonotakashi 0:8fdf9a60065b 111 result += seconds_before_month[_rtc_is_leap_year(time->tm_year, leap_year_support)][time->tm_mon];
kadonotakashi 0:8fdf9a60065b 112
kadonotakashi 0:8fdf9a60065b 113 /* Check if we are within valid range. */
kadonotakashi 0:8fdf9a60065b 114 if (time->tm_year == LAST_VALID_YEAR) {
kadonotakashi 0:8fdf9a60065b 115 if ((leap_year_support == RTC_FULL_LEAP_YEAR_SUPPORT && result > EDGE_TIMESTAMP_FULL_LEAP_YEAR_SUPPORT) ||
kadonotakashi 0:8fdf9a60065b 116 (leap_year_support == RTC_4_YEAR_LEAP_YEAR_SUPPORT && result > EDGE_TIMESTAMP_4_YEAR_LEAP_YEAR_SUPPORT)) {
kadonotakashi 0:8fdf9a60065b 117 return false;
kadonotakashi 0:8fdf9a60065b 118 }
kadonotakashi 0:8fdf9a60065b 119 }
kadonotakashi 0:8fdf9a60065b 120
kadonotakashi 0:8fdf9a60065b 121 if (time->tm_year > 70) {
kadonotakashi 0:8fdf9a60065b 122 /* Valid in the range [70:206]. */
kadonotakashi 0:8fdf9a60065b 123 uint32_t count_of_leap_days = ((time->tm_year - 1) / 4) - (70 / 4);
kadonotakashi 0:8fdf9a60065b 124 if (leap_year_support == RTC_FULL_LEAP_YEAR_SUPPORT) {
kadonotakashi 0:8fdf9a60065b 125 if (time->tm_year > 200) {
kadonotakashi 0:8fdf9a60065b 126 count_of_leap_days--; // 2100 is not a leap year
kadonotakashi 0:8fdf9a60065b 127 }
kadonotakashi 0:8fdf9a60065b 128 }
kadonotakashi 0:8fdf9a60065b 129
kadonotakashi 0:8fdf9a60065b 130 result += (((time->tm_year - 70) * 365) + count_of_leap_days) * SECONDS_BY_DAY;
kadonotakashi 0:8fdf9a60065b 131 }
kadonotakashi 0:8fdf9a60065b 132
kadonotakashi 0:8fdf9a60065b 133 *seconds = result;
kadonotakashi 0:8fdf9a60065b 134
kadonotakashi 0:8fdf9a60065b 135 return true;
kadonotakashi 0:8fdf9a60065b 136 }
kadonotakashi 0:8fdf9a60065b 137
kadonotakashi 0:8fdf9a60065b 138 bool _rtc_localtime(time_t timestamp, struct tm *time_info, rtc_leap_year_support_t leap_year_support)
kadonotakashi 0:8fdf9a60065b 139 {
kadonotakashi 0:8fdf9a60065b 140 if (time_info == NULL) {
kadonotakashi 0:8fdf9a60065b 141 return false;
kadonotakashi 0:8fdf9a60065b 142 }
kadonotakashi 0:8fdf9a60065b 143
kadonotakashi 0:8fdf9a60065b 144 uint32_t seconds = (uint32_t)timestamp;
kadonotakashi 0:8fdf9a60065b 145
kadonotakashi 0:8fdf9a60065b 146 time_info->tm_sec = seconds % 60;
kadonotakashi 0:8fdf9a60065b 147 seconds = seconds / 60; // timestamp in minutes
kadonotakashi 0:8fdf9a60065b 148 time_info->tm_min = seconds % 60;
kadonotakashi 0:8fdf9a60065b 149 seconds = seconds / 60; // timestamp in hours
kadonotakashi 0:8fdf9a60065b 150 time_info->tm_hour = seconds % 24;
kadonotakashi 0:8fdf9a60065b 151 seconds = seconds / 24; // timestamp in days;
kadonotakashi 0:8fdf9a60065b 152
kadonotakashi 0:8fdf9a60065b 153 /* Compute the weekday.
kadonotakashi 0:8fdf9a60065b 154 * The 1st of January 1970 was a Thursday which is equal to 4 in the weekday representation ranging from [0:6].
kadonotakashi 0:8fdf9a60065b 155 */
kadonotakashi 0:8fdf9a60065b 156 time_info->tm_wday = (seconds + 4) % 7;
kadonotakashi 0:8fdf9a60065b 157
kadonotakashi 0:8fdf9a60065b 158 /* Years start at 70. */
kadonotakashi 0:8fdf9a60065b 159 time_info->tm_year = 70;
kadonotakashi 0:8fdf9a60065b 160 while (true) {
kadonotakashi 0:8fdf9a60065b 161 if (_rtc_is_leap_year(time_info->tm_year, leap_year_support) && seconds >= 366) {
kadonotakashi 0:8fdf9a60065b 162 ++time_info->tm_year;
kadonotakashi 0:8fdf9a60065b 163 seconds -= 366;
kadonotakashi 0:8fdf9a60065b 164 } else if (!_rtc_is_leap_year(time_info->tm_year, leap_year_support) && seconds >= 365) {
kadonotakashi 0:8fdf9a60065b 165 ++time_info->tm_year;
kadonotakashi 0:8fdf9a60065b 166 seconds -= 365;
kadonotakashi 0:8fdf9a60065b 167 } else {
kadonotakashi 0:8fdf9a60065b 168 /* The remaining days are less than a years. */
kadonotakashi 0:8fdf9a60065b 169 break;
kadonotakashi 0:8fdf9a60065b 170 }
kadonotakashi 0:8fdf9a60065b 171 }
kadonotakashi 0:8fdf9a60065b 172
kadonotakashi 0:8fdf9a60065b 173 time_info->tm_yday = seconds;
kadonotakashi 0:8fdf9a60065b 174
kadonotakashi 0:8fdf9a60065b 175 /* Convert days into seconds and find the current month. */
kadonotakashi 0:8fdf9a60065b 176 seconds *= SECONDS_BY_DAY;
kadonotakashi 0:8fdf9a60065b 177 time_info->tm_mon = 11;
kadonotakashi 0:8fdf9a60065b 178 bool leap = _rtc_is_leap_year(time_info->tm_year, leap_year_support);
kadonotakashi 0:8fdf9a60065b 179 for (uint32_t i = 0; i < 12; ++i) {
kadonotakashi 0:8fdf9a60065b 180 if ((uint32_t) seconds < seconds_before_month[leap][i]) {
kadonotakashi 0:8fdf9a60065b 181 time_info->tm_mon = i - 1;
kadonotakashi 0:8fdf9a60065b 182 break;
kadonotakashi 0:8fdf9a60065b 183 }
kadonotakashi 0:8fdf9a60065b 184 }
kadonotakashi 0:8fdf9a60065b 185
kadonotakashi 0:8fdf9a60065b 186 /* Remove month from timestamp and compute the number of days.
kadonotakashi 0:8fdf9a60065b 187 * Note: unlike other fields, days are not 0 indexed.
kadonotakashi 0:8fdf9a60065b 188 */
kadonotakashi 0:8fdf9a60065b 189 seconds -= seconds_before_month[leap][time_info->tm_mon];
kadonotakashi 0:8fdf9a60065b 190 time_info->tm_mday = (seconds / SECONDS_BY_DAY) + 1;
kadonotakashi 0:8fdf9a60065b 191
kadonotakashi 0:8fdf9a60065b 192 return true;
kadonotakashi 0:8fdf9a60065b 193 }