Enrico Fraccaroli (Galfurian)
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/// @file time.c
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/// @brief Clock functions.
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/// @copyright (c) 2014-2023 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include "io/debug.h"
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#include "drivers/rtc.h"
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#include "hardware/timer.h"
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#include "io/port_io.h"
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#include "stddef.h"
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#include "stdio.h"
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#include "time.h"
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static const char *str_weekdays[] = { "Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday" };
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static const char *str_months[] = { "January", "February", "March", "April",
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"May", "June", "July", "August",
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"September", "October", "November", "December" };
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time_t sys_time(time_t *time)
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{
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tm_t curr_time;
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gettime(&curr_time);
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// January and February are counted as months 13 and 14 of the previous year.
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if (curr_time.tm_mon <= 2) {
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curr_time.tm_mon += 12;
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curr_time.tm_year -= 1;
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}
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time_t t;
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// Convert years to days
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t = (365 * curr_time.tm_year) + (curr_time.tm_year / 4) - (curr_time.tm_year / 100) +
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(curr_time.tm_year / 400);
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// Convert months to days
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t += (30 * curr_time.tm_mon) + (3 * (curr_time.tm_mon + 1) / 5) + curr_time.tm_mday;
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// Unix time starts on January 1st, 1970
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t -= 719561;
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// Convert days to seconds
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t *= 86400;
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// Add hours, minutes and seconds
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t += (3600 * curr_time.tm_hour) + (60 * curr_time.tm_min) + curr_time.tm_sec;
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if (time) {
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(*time) = t;
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}
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return t;
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}
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time_t difftime(time_t time1, time_t time2)
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{
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return time1 - time2;
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}
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/// @brief Computes day of week
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/// @param y Year
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/// @param m Month of year (in range 1 to 12)
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/// @param d Day of month (in range 1 to 31)
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/// @return Day of week (in range 1 to 7)
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static inline int day_of_week(unsigned int y, unsigned int m, unsigned int d)
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{
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int h, j, k;
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// January and February are counted as months 13 and 14 of the previous year
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if (m <= 2) {
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m += 12;
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y -= 1;
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}
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// J is the century
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j = (int)(y / 100);
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// K the year of the century
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k = (int)(y % 100);
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// Compute H using Zeller's congruence
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h = (int)(d + (26 * (m + 1) / 10) + k + (k / 4) + (5 * j) + (j / 4));
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// Return the day of the week
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return ((h + 5) % 7) + 1;
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}
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tm_t *localtime(const time_t *time)
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{
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static tm_t date;
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unsigned int a, b, c, d, e, f;
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time_t t = *time;
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// Negative Unix time values are not supported
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if (t < 1) {
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t = 0;
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}
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//Retrieve hours, minutes and seconds
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date.tm_sec = (int)(t % 60);
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t /= 60;
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date.tm_min = (int)(t % 60);
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t /= 60;
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date.tm_hour = (int)(t % 24);
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t /= 24;
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// Convert Unix time to date
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a = (unsigned int)((4 * t + 102032) / 146097 + 15);
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b = (t + 2442113 + a - (a / 4));
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c = (20 * b - 2442) / 7305;
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d = b - 365 * c - (c / 4);
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e = d * 1000 / 30601;
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f = d - e * 30 - e * 601 / 1000;
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// January and February are counted as months 13 and 14 of the previous year
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if (e <= 13) {
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c -= 4716;
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e -= 1;
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} else {
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c -= 4715;
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e -= 13;
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}
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//Retrieve year, month and day
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date.tm_year = (int)c;
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date.tm_mon = (int)e;
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date.tm_mday = (int)f;
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// Calculate day of week.
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date.tm_wday = day_of_week(date.tm_year, date.tm_mon, date.tm_mday);
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return &date;
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}
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