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/*
* File : rtc.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2012-01-29 aozima first version.
* 2012-04-12 aozima optimization: find rtc device only first.
* 2012-04-16 aozima add scheduler lock for set_date and set_time.
*/
#include <time.h>
#include <string.h>
#include <rtthread.h>
/** \brief returns the current time.
*
* \param time_t * t the timestamp pointer, if not used, keep NULL.
* \return time_t return timestamp current.
*
*/
/* for IAR 6.2 later Compiler */
#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
#pragma module_name = "?time"
time_t (__time32)(time_t *t) /* Only supports 32-bit timestamp */
#else
time_t time(time_t *t)
#endif
{
static rt_device_t device = RT_NULL;
time_t time_now = 0;
/* optimization: find rtc device only first. */
if (device == RT_NULL)
{
device = rt_device_find("rtc");
}
/* read timestamp from RTC device. */
if (device != RT_NULL)
{
if (rt_device_open(device, 0) == RT_EOK)
{
rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time_now);
rt_device_close(device);
}
}
/* if t is not NULL, write timestamp to *t */
if (t != RT_NULL)
{
*t = time_now;
}
return time_now;
}
/** \brief set system date(time not modify).
*
* \param rt_uint32_t year e.g: 2012.
* \param rt_uint32_t month e.g: 12 (1~12).
* \param rt_uint32_t day e.g: e.g: 31.
* \return rt_err_t if set success, return RT_EOK.
*
*/
rt_err_t set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
{
time_t now;
struct tm *p_tm;
struct tm tm_new;
rt_device_t device;
rt_err_t ret = -RT_ERROR;
/* get current time */
now = time(RT_NULL);
/* lock scheduler. */
rt_enter_critical();
/* converts calendar time time into local time. */
p_tm = localtime(&now);
/* copy the statically located variable */
memcpy(&tm_new, p_tm, sizeof(struct tm));
/* unlock scheduler. */
rt_exit_critical();
/* update date. */
tm_new.tm_year = year - 1900;
tm_new.tm_mon = month - 1; /* tm_mon: 0~11 */
tm_new.tm_mday = day;
/* converts the local time in time to calendar time. */
now = mktime(&tm_new);
device = rt_device_find("rtc");
if (device == RT_NULL)
{
return -RT_ERROR;
}
/* update to RTC device. */
ret = rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
return ret;
}
/** \brief set system time(date not modify).
*
* \param rt_uint32_t hour e.g: 0~23.
* \param rt_uint32_t minute e.g: 0~59.
* \param rt_uint32_t second e.g: 0~59.
* \return rt_err_t if set success, return RT_EOK.
*
*/
rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
{
time_t now;
struct tm *p_tm;
struct tm tm_new;
rt_device_t device;
rt_err_t ret = -RT_ERROR;
/* get current time */
now = time(RT_NULL);
/* lock scheduler. */
rt_enter_critical();
/* converts calendar time time into local time. */
p_tm = localtime(&now);
/* copy the statically located variable */
memcpy(&tm_new, p_tm, sizeof(struct tm));
/* unlock scheduler. */
rt_exit_critical();
/* update time. */
tm_new.tm_hour = hour;
tm_new.tm_min = minute;
tm_new.tm_sec = second;
/* converts the local time in time to calendar time. */
now = mktime(&tm_new);
device = rt_device_find("rtc");
if (device == RT_NULL)
{
return -RT_ERROR;
}
/* update to RTC device. */
ret = rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
return ret;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
#include <rtdevice.h>
void list_date(void)
{
time_t now;
now = time(RT_NULL);
rt_kprintf("%s\n", ctime(&now));
}
FINSH_FUNCTION_EXPORT(list_date, show date and time.)
FINSH_FUNCTION_EXPORT(set_date, set date. e.g: set_date(2010,2,28))
FINSH_FUNCTION_EXPORT(set_time, set time. e.g: set_time(23,59,59))
#endif
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