160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <sys/time.h>
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#include <rtthread.h>
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/* days per month -- nonleap! */
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const short __spm[13] =
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{
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0,
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(31),
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(31 + 28),
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(31 + 28 + 31),
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(31 + 28 + 31 + 30),
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(31 + 28 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
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};
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/* seconds per day */
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#define SPD 24*60*60
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#ifdef RT_USING_DEVICE
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int gettimeofday(struct timeval *tp, void *ignore)
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{
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time_t time;
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rt_device_t device;
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device = rt_device_find("rtc");
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if (device != RT_NULL)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
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if (tp != RT_NULL)
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{
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tp->tv_sec = time;
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tp->tv_usec = 0;
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}
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return time;
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}
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return 0;
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}
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#endif
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/**
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* Returns the current time.
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*
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* @param time_t * t the timestamp pointer, if not used, keep NULL.
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*
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* @return time_t return timestamp current.
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*
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*/
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/* for IAR 6.2 later Compiler */
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#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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#pragma module_name = "?time"
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time_t (__time32)(time_t *t) /* Only supports 32-bit timestamp */
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#else
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time_t time(time_t *t)
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#endif
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{
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time_t time_now = 0;
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#ifdef RT_USING_RTC
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static rt_device_t device = RT_NULL;
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/* optimization: find rtc device only first. */
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if (device == RT_NULL)
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{
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device = rt_device_find("rtc");
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}
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/* read timestamp from RTC device. */
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if (device != RT_NULL)
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{
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if (rt_device_open(device, 0) == RT_EOK)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time_now);
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rt_device_close(device);
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}
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}
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#endif /* RT_USING_RTC */
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/* if t is not NULL, write timestamp to *t */
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if (t != RT_NULL)
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{
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*t = time_now;
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}
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return time_now;
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}
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static int __isleap(int year)
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{
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/* every fourth year is a leap year except for century years that are
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* not divisible by 400. */
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/* return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
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return (!(year % 4) && ((year % 100) || !(year % 400)));
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}
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/**
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* This function will convert Time (Restartable)
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*
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* @param timep the timestamp
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* @param the structure to stores information
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*
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* @return the structure to stores information
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*
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*/
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struct tm *gmtime_r(const time_t *timep, struct tm *r)
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{
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time_t i;
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register time_t work = *timep % (SPD);
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r->tm_sec = work % 60;
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work /= 60;
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r->tm_min = work % 60;
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r->tm_hour = work / 60;
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work = *timep / (SPD);
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r->tm_wday = (4 + work) % 7;
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for (i = 1970;; ++i)
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{
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register time_t k = __isleap(i) ? 366 : 365;
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if (work >= k)
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work -= k;
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else
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break;
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}
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r->tm_year = i - 1900;
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r->tm_yday = work;
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r->tm_mday = 1;
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if (__isleap(i) && (work > 58))
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{
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if (work == 59)
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r->tm_mday = 2; /* 29.2. */
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work -= 1;
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}
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for (i = 11; i && (__spm[i] > work); --i)
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;
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r->tm_mon = i;
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r->tm_mday += work - __spm[i];
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return r;
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}
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RT_WEAK clock_t clock(void)
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{
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return rt_tick_get();
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}
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