156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*
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* File : clock_time.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2012-12-08 Bernard fix the issue of _timevalue.tv_usec initialization,
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* which found by Rob <rdent@iinet.net.au>
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*/
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#include <rtthread.h>
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#include <pthread.h>
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struct timeval _timevalue;
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void clock_time_system_init()
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{
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time_t time;
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rt_tick_t tick;
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rt_device_t device;
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time = 0;
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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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/* get realtime seconds */
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
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}
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/* get tick */
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tick = rt_tick_get();
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_timevalue.tv_usec = (tick%RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
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_timevalue.tv_sec = time - tick/RT_TICK_PER_SECOND - 1;
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}
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int clock_time_to_tick(const struct timespec *time)
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{
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int tick;
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int nsecond, second;
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struct timespec tp;
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RT_ASSERT(time != RT_NULL);
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tick = RT_WAITING_FOREVER;
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if (time != NULL)
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{
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/* get current tp */
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clock_gettime(CLOCK_REALTIME, &tp);
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if ((time->tv_nsec - tp.tv_nsec) < 0)
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{
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nsecond = NANOSECOND_PER_SECOND - (tp.tv_nsec - time->tv_nsec);
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second = time->tv_sec - tp.tv_sec - 1;
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}
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else
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{
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nsecond = time->tv_nsec - tp.tv_nsec;
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second = time->tv_sec - tp.tv_sec;
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}
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tick = second * RT_TICK_PER_SECOND + nsecond * RT_TICK_PER_SECOND / NANOSECOND_PER_SECOND;
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if (tick < 0) tick = 0;
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}
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return tick;
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}
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RTM_EXPORT(clock_time_to_tick);
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int clock_getres(clockid_t clockid, struct timespec *res)
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{
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if ((clockid != CLOCK_REALTIME) || (res == RT_NULL))
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{
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rt_set_errno(EINVAL);
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return -1;
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}
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res->tv_sec = 0;
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res->tv_nsec = NANOSECOND_PER_SECOND/RT_TICK_PER_SECOND;
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return 0;
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}
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RTM_EXPORT(clock_getres);
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int clock_gettime(clockid_t clockid, struct timespec *tp)
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{
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rt_tick_t tick;
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if ((clockid != CLOCK_REALTIME) || (tp == RT_NULL))
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{
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rt_set_errno(EINVAL);
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return -1;
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}
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/* get tick */
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tick = rt_tick_get();
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tp->tv_sec = _timevalue.tv_sec + tick / RT_TICK_PER_SECOND;
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tp->tv_nsec = (_timevalue.tv_usec + (tick % RT_TICK_PER_SECOND) * NANOSECOND_PER_TICK) * 1000;
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return 0;
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}
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RTM_EXPORT(clock_gettime);
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int clock_settime(clockid_t clockid, const struct timespec *tp)
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{
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int second;
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rt_tick_t tick;
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rt_device_t device;
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if ((clockid != CLOCK_REALTIME) || (tp == RT_NULL))
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{
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rt_set_errno(EINVAL);
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return -1;
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}
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/* get second */
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second = tp->tv_sec;
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/* get tick */
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tick = rt_tick_get();
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/* update timevalue */
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_timevalue.tv_usec = MICROSECOND_PER_SECOND - (tick % RT_TICK_PER_SECOND) * MICROSECOND_PER_TICK;
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_timevalue.tv_sec = second - tick/RT_TICK_PER_SECOND - 1;
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/* update for RTC 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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/* set realtime seconds */
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rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &second);
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}
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else
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return -1;
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return 0;
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}
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RTM_EXPORT(clock_settime);
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