diff --git a/components/drivers/rtc/SConscript b/components/drivers/rtc/SConscript
index b2d50de7588bea6163c3b528839c866bc3ed2b95..65552a7765317ddfa72703741c9620e04ba6fa19 100644
--- a/components/drivers/rtc/SConscript
+++ b/components/drivers/rtc/SConscript
@@ -1,8 +1,20 @@
 from building import *
 
-cwd     = GetCurrentDir()
-src	= Glob('*.c')
+cwd = GetCurrentDir()
+src = [] 
+
+rtc = ['rtc.c']
+
+rtc_alarm = ['alarm.c']
+
 CPPPATH = [cwd + '/../include']
+group = []
+
+if GetDepend(['RT_USING_RTC']):
+    src = src + rtc
+    if GetDepend(['RT_USING_ALARM']): 
+        src = src + rtc_alarm
+
 group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_RTC'], CPPPATH = CPPPATH)
 
-Return('group')
+Return('group')
\ No newline at end of file
diff --git a/components/drivers/rtc/alarm.c b/components/drivers/rtc/alarm.c
new file mode 100644
index 0000000000000000000000000000000000000000..17047baeb9725357d58c572cc9caeb41e10c480d
--- /dev/null
+++ b/components/drivers/rtc/alarm.c
@@ -0,0 +1,606 @@
+/*
+ * File      : alarm.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2012-10-27     heyuanjie87       first version.
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#define RT_RTC_YEARS_MAX         137
+#define RT_ALARM_DELAY             2
+#define RT_ALARM_STATE_INITED   0x02
+#define RT_ALARM_STATE_START    0x01
+#define RT_ALARM_STATE_STOP     0x00
+
+#if(defined(RT_USING_RTC) && defined(RT_USING_ALARM))
+static struct rt_alarm_container _container;
+
+rt_inline rt_uint32_t alarm_mkdaysec(struct tm *time)
+{
+    rt_uint32_t sec;
+
+    sec = time->tm_sec;
+    sec += time->tm_min * 60;
+    sec += time->tm_hour * 3600;
+
+    return (sec);
+}
+
+static rt_err_t alarm_set(struct rt_alarm *alarm)
+{
+    rt_device_t device;
+    struct rt_rtc_wkalarm wkalarm;
+    rt_err_t ret;
+
+    device = rt_device_find("rtc");
+    if (device == RT_NULL)
+    {
+        return (RT_ERROR);
+    }
+    if (alarm->flag & RT_ALARM_STATE_START)
+        wkalarm.enable = RT_TRUE;
+    else
+        wkalarm.enable = RT_FALSE;
+
+    wkalarm.tm_sec = alarm->wktime.tm_sec;
+    wkalarm.tm_min = alarm->wktime.tm_min;
+    wkalarm.tm_hour = alarm->wktime.tm_hour;
+
+    ret = rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_ALARM, &wkalarm);
+    if ((ret == RT_EOK) && wkalarm.enable)
+    {
+        ret = rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_ALARM, &wkalarm);
+        if (ret == RT_EOK)
+        {
+            /* 
+              some RTC device like RX8025,it's alarms precision is 1 minute.
+              in this case,low level RTC driver should set wkalarm->tm_sec to 0.
+            */
+            alarm->wktime.tm_sec = wkalarm.tm_sec;
+            alarm->wktime.tm_min = wkalarm.tm_min;
+            alarm->wktime.tm_hour = wkalarm.tm_hour;
+        }
+    }
+
+    return (ret);
+}
+
+static alarm_wakeup(struct rt_alarm *alarm, struct tm *now)
+{
+    rt_uint32_t sec_alarm, sec_now;
+    rt_bool_t wakeup = RT_FALSE;
+    time_t timestamp;
+    
+    sec_alarm = alarm_mkdaysec(&alarm->wktime);
+    sec_now = alarm_mkdaysec(now);
+
+    if (alarm->flag & RT_ALARM_STATE_START)
+    {
+        switch (alarm->flag & 0xFF00)
+        {
+        case RT_ALARM_ONESHOT:
+        {
+            sec_alarm = mktime(&alarm->wktime);
+            sec_now = mktime(now);
+            if (((sec_now - sec_alarm) <= RT_ALARM_DELAY) && (sec_now >= sec_alarm))
+            {
+                /* stop alarm */
+                alarm->flag &= ~RT_ALARM_STATE_START;
+                alarm_set(alarm);
+                wakeup = RT_TRUE;
+            }  
+        }
+        break;
+        case RT_ALARM_DAILY:
+        {
+            if (((sec_now - sec_alarm) <= RT_ALARM_DELAY) && (sec_now >= sec_alarm))
+                wakeup = RT_TRUE;
+        }
+        break;
+        case RT_ALARM_WEEKLY:
+        {
+            /* alarm at wday */
+            sec_alarm += alarm->wktime.tm_wday * 24 * 3600;
+            sec_now += now->tm_wday * 24 * 3600;
+
+            if (((sec_now - sec_alarm) <= RT_ALARM_DELAY) && (sec_now >= sec_alarm))
+                wakeup = RT_TRUE;
+        }
+        break;
+        case RT_ALARM_MONTHLY:
+        {
+            /* monthly someday generate alarm signals */
+            if (alarm->wktime.tm_mday == now->tm_mday)
+            {
+                if ((sec_now - sec_alarm) <= RT_ALARM_DELAY)
+                    wakeup = RT_TRUE;
+            }
+        }
+        break;
+        case RT_ALARM_YAERLY:
+        {
+            if ((alarm->wktime.tm_mday == now->tm_mday) && \
+                (alarm->wktime.tm_mon == now->tm_mon))
+            {
+                  if ((sec_now - sec_alarm) <= RT_ALARM_DELAY)
+                    wakeup = RT_TRUE;           
+            }
+        }
+        break;
+        }
+
+        if ((wakeup == RT_TRUE) && (alarm->callback != RT_NULL))
+        {
+            timestamp = time(RT_NULL);
+            alarm->callback(alarm, timestamp);
+        }   
+    }
+}
+
+static void alarm_update(rt_uint32_t event)
+{
+    struct rt_alarm *alm_prev = RT_NULL, *alm_next = RT_NULL;
+    struct rt_alarm *alarm;
+    rt_int32_t sec_now, sec_alarm, sec_tmp;
+    rt_int32_t sec_next = 24 * 3600, sec_prev = 0;
+    time_t timestamp;
+    struct tm now;
+    rt_list_t *next;
+
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);
+    if (!rt_list_isempty(&_container.head))
+    {
+        /* get time of now */
+        timestamp = time(RT_NULL);
+        localtime_r(&timestamp, &now);
+
+        for (next = _container.head.next; next != &_container.head; next = next->next)
+        {
+            alarm = rt_list_entry(next, struct rt_alarm, list);
+            /* check the overtime alarm */
+            alarm_wakeup(alarm, &now);
+        }
+
+        timestamp = time(RT_NULL);
+        localtime_r(&timestamp, &now);
+        sec_now = alarm_mkdaysec(&now);
+
+        for (next = _container.head.next; next != &_container.head; next = next->next)
+        {
+            alarm = rt_list_entry(next, struct rt_alarm, list);
+            /* calculate seconds from 00:00:00 */
+            sec_alarm = alarm_mkdaysec(&alarm->wktime);
+
+            if ((alarm->flag & RT_ALARM_STATE_START) && (alarm != _container.current))
+            {
+                sec_tmp = sec_alarm - sec_now;
+                if (sec_tmp > 0)
+                {
+                    /* find alarm after now(now to 23:59:59) and the most recent */
+                    if (sec_tmp < sec_next)
+                    {
+                        sec_next = sec_tmp;
+                        alm_next = alarm;
+                    }
+                }
+                else
+                {
+                    /* find alarm before now(00:00:00 to now) and furthest from now */
+                    if (sec_tmp < sec_prev)
+                    {
+                        sec_prev = sec_tmp;
+                        alm_prev = alarm;
+                    }
+                }
+            }
+        }
+        /* enable the alarm after now first */
+        if (sec_next < 24 * 3600)
+        {
+            if (alarm_set(alm_next) == RT_EOK)
+                _container.current = alm_next;
+        }
+        else if (sec_prev < 0)
+        {
+            /* enable the alarm before now */
+            if (alarm_set(alm_prev) == RT_EOK)
+                _container.current = alm_prev;
+        }
+    }
+    rt_mutex_release(&_container.mutex);
+}
+
+static rt_uint32_t days_of_year_month(int tm_year, int tm_mon)
+{
+    rt_uint32_t ret, year;
+
+    year = tm_year + 1900;
+    if (tm_mon == 1)
+    {
+        ret = 28 + ((!(year % 4) && (year % 100)) || !(year % 400));
+    }
+    else if (((tm_mon <= 6) && (tm_mon % 2 == 0)) || ((tm_mon > 6) && (tm_mon % 2 == 1)))
+    {
+        ret = 31;
+    }
+    else
+    {
+        ret = 30;
+    }
+
+    return (ret);
+}
+
+static rt_bool_t is_valid_date(struct tm *date)
+{
+    if ((date->tm_year < 0) || (date->tm_year > RT_RTC_YEARS_MAX))
+    {
+        return (RT_FALSE);
+    }
+
+    if ((date->tm_mon < 0) || (date->tm_mon > 11))
+    {
+        return (RT_FALSE);
+    }
+
+    if ((date->tm_mday < 1) || \
+        (date->tm_mday > days_of_year_month(date->tm_year, date->tm_mon)))
+    {
+        return (RT_FALSE);
+    }
+
+    return (RT_TRUE);
+}
+
+static rt_err_t alarm_setup(rt_alarm_t alarm, struct tm *wktime)
+{
+    rt_err_t ret = RT_ERROR;
+    time_t timestamp;
+    struct tm *setup, now;
+
+    setup = &alarm->wktime;
+    *setup = *wktime;
+    timestamp = time(RT_NULL);
+    localtime_r(&timestamp, &now);
+
+    /* if these are a "don't care" value,we set them to now*/
+    if ((setup->tm_sec > 59) || (setup->tm_sec < 0))
+        setup->tm_sec = now.tm_sec;
+    if ((setup->tm_min > 59) || (setup->tm_min < 0))
+        setup->tm_min = now.tm_min;
+    if ((setup->tm_hour > 23) || (setup->tm_hour < 0))
+        setup->tm_hour = now.tm_hour;
+
+    switch (alarm->flag & 0xFF00)
+    {
+    case RT_ALARM_DAILY:
+    {
+        /* do nothing but needed */
+    }
+    break;
+    case RT_ALARM_ONESHOT:
+    {
+        /* if these are "don't care" value we set them to now */
+        if (setup->tm_year == RT_ALARM_TM_NOW)
+            setup->tm_year = now.tm_year;
+        if (setup->tm_mon == RT_ALARM_TM_NOW)
+            setup->tm_mon = now.tm_mon;
+        if (setup->tm_mday == RT_ALARM_TM_NOW)
+            setup->tm_mday = now.tm_mday;
+        /* make sure the setup is valid */
+        if (!is_valid_date(setup))
+            goto _exit;
+    }
+    break;
+    case RT_ALARM_WEEKLY:
+    {
+        /* if tm_wday is a "don't care" value we set it to now */
+        if ((setup->tm_wday < 0) || (setup->tm_wday > 6))
+            setup->tm_wday = now.tm_wday;
+    }
+    break;
+    case RT_ALARM_MONTHLY:
+    {
+        /* if tm_mday is a "don't care" value we set it to now */
+        if ((setup->tm_mday < 1) || (setup->tm_mday > 31))
+            setup->tm_mday = now.tm_mday;
+    }
+    break;
+    case RT_ALARM_YAERLY:
+    {
+        /* if tm_mon is a "don't care" value we set it to now */
+        if ((setup->tm_mon < 0) || (setup->tm_mon > 11))
+            setup->tm_mon = now.tm_mon;
+
+        if (setup->tm_mon == 1)
+        {
+            /* tm_mon is February */
+
+            /* tm_mday should be 1~29.otherwise,it's a "don't care" value */
+            if ((setup->tm_mday < 1) || (setup->tm_mday > 29))
+                setup->tm_mday = now.tm_mday;
+        }
+        else if (((setup->tm_mon <= 6) && (setup->tm_mon % 2 == 0)) || \
+                 ((setup->tm_mon > 6) && (setup->tm_mon % 2 == 1)))
+        {
+            /* Jan,Mar,May,Jul,Aug,Oct,Dec */
+
+            /* tm_mday should be 1~31.otherwise,it's a "don't care" value */
+            if ((setup->tm_mday < 1) || (setup->tm_mday > 31))
+                setup->tm_mday = now.tm_mday;
+        }
+        else
+        {
+            /* tm_mday should be 1~30.otherwise,it's a "don't care" value */
+            if ((setup->tm_mday < 1) || (setup->tm_mday > 30))
+                setup->tm_mday = now.tm_mday;
+        }
+    }
+    break;
+    default:
+    {
+        goto _exit;
+    }
+    }
+    
+    if ((setup->tm_hour == 23) && (setup->tm_min == 59) && (setup->tm_sec == 59))
+    {
+        /*
+           for insurance purposes, we will generate an alarm
+           signal two seconds ahead of.
+        */
+        setup->tm_sec = 60 - RT_ALARM_DELAY;
+    }
+    /* set initialized state */
+    alarm->flag |= RT_ALARM_STATE_INITED;
+    ret = RT_EOK;
+   
+_exit:
+
+    return (ret);
+}
+
+/** \brief send a rtc alarm event
+ *
+ * \param dev pointer to RTC device(currently unused,you can ignore it)
+ * \param event RTC event(currently unused) 
+ * \return none
+ */
+void rt_alarm_update(rt_device_t dev, rt_uint32_t event)
+{
+    rt_event_send(&_container.event, 1);
+}
+
+/** \breif modify the alarm setup
+ *
+ * \param alarm pointer to alarm
+ * \param cmd control command
+ * \param arg argument
+ */
+rt_err_t rt_alarm_control(rt_alarm_t alarm, rt_uint8_t cmd, void *arg)
+{
+    rt_err_t ret = RT_ERROR;
+
+    RT_ASSERT(alarm != RT_NULL);
+    
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);
+    switch (cmd)
+    {
+    case RT_ALARM_MODIFY:
+    {
+        struct rt_alarm_setup *setup;
+        
+        RT_ASSERT(arg != RT_NULL); 
+        setup = arg;
+        rt_alarm_stop(alarm);
+        alarm->flag = setup->flag & 0xFF00;
+        alarm->wktime = setup->wktime;
+        ret = alarm_setup(alarm, &alarm->wktime);  
+    }
+    break;  
+    }
+
+    rt_mutex_release(&_container.mutex); 
+
+    return (ret);
+}
+
+/** \brief start a alarm
+ *
+ * \param alarm pointer to alarm
+ * \return RT_EOK
+ */
+rt_err_t rt_alarm_start(rt_alarm_t alarm)
+{
+    rt_int32_t sec_now, sec_old, sec_new;
+    rt_err_t ret = RT_ERROR;
+    time_t timestamp;
+    struct tm now;
+    
+    if (alarm == RT_NULL)
+        return (ret);
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);
+    if (!(alarm->flag & RT_ALARM_STATE_INITED))
+    {
+        if (alarm_setup(alarm, &alarm->wktime) != RT_EOK)
+            goto _exit;
+    }   
+    if ((alarm->flag & 0x01) == RT_ALARM_STATE_STOP)
+    {
+        timestamp = time(RT_NULL);
+        localtime_r(&timestamp, &now);
+            
+        alarm->flag |= RT_ALARM_STATE_START;
+        /* set alarm */
+        if (_container.current == RT_NULL)
+        {
+            ret = alarm_set(alarm);
+        }
+        else
+        {
+            sec_now = alarm_mkdaysec(&now);
+            sec_old = alarm_mkdaysec(&_container.current->wktime);
+            sec_new = alarm_mkdaysec(&alarm->wktime);
+
+            if ((sec_new < sec_old) && (sec_new > sec_now))
+            {
+                ret = alarm_set(alarm);
+            }
+            else if ((sec_new > sec_now) && (sec_old < sec_now))
+            {
+                ret = alarm_set(alarm);
+            }
+            else if ((sec_new < sec_old) && (sec_old < sec_now))
+            {
+                ret = alarm_set(alarm);
+            }
+        }
+
+        if (ret == RT_EOK)
+        {
+            _container.current = alarm;
+        }
+    }
+
+_exit:
+    rt_mutex_release(&_container.mutex);
+
+    return (ret);
+}
+
+/** \brief stop a alarm
+ *
+ * \param alarm pointer to alarm
+ * \return RT_EOK
+ */
+rt_err_t rt_alarm_stop(rt_alarm_t alarm)
+{
+    rt_err_t ret = RT_ERROR;
+    
+    if (alarm == RT_NULL)
+        return (ret);
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);
+    if (!(alarm->flag & RT_ALARM_STATE_START))
+        goto _exit;
+    /* stop alarm */
+    alarm->flag &= ~RT_ALARM_STATE_START;
+    
+    if (_container.current == alarm)
+    {
+        ret = alarm_set(alarm);
+        _container.current = RT_NULL;
+    }    
+
+    if (ret == RT_EOK)
+        alarm_update(0);
+
+_exit:
+    rt_mutex_release(&_container.mutex);
+
+    return (ret);
+}
+
+/** \brief delete a alarm
+ *
+ * \param alarm pointer to alarm
+ * \return RT_EOK
+ */
+rt_err_t rt_alarm_delete(rt_alarm_t alarm)
+{
+    rt_err_t ret = RT_ERROR;
+    
+    if (alarm == RT_NULL)
+        return (ret);    
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);    
+    /* stop the alarm */
+    alarm->flag &= ~RT_ALARM_STATE_START;
+    if (_container.current == alarm)
+    {
+        ret = alarm_set(alarm);
+        _container.current = RT_NULL;
+        /* set new alarm if necessary */
+        alarm_update(0);        
+    }
+    rt_list_remove(&alarm->list);
+    rt_free(alarm);
+
+    rt_mutex_release(&_container.mutex);
+    
+    return (ret);
+}
+
+/** \brief create a alarm
+ *
+ * \param flag set alarm mode e.g: RT_ALARM_DAILY
+ * \param setup pointer to setup infomation
+ */
+rt_alarm_t rt_alarm_create(rt_alarm_callback_t callback, struct rt_alarm_setup *setup)
+{
+    struct rt_alarm *alarm;
+    
+    if (setup == RT_NULL)
+        return (RT_NULL);
+    alarm = rt_malloc(sizeof(struct rt_alarm));
+    if (alarm == RT_NULL)
+        return (RT_NULL);
+    rt_list_init(&alarm->list);
+    
+    alarm->wktime = setup->wktime;
+    alarm->flag = setup->flag & 0xFF00;
+    alarm->callback = callback;
+    rt_mutex_take(&_container.mutex, RT_WAITING_FOREVER);    
+    rt_list_insert_after(&_container.head, &alarm->list);
+    rt_mutex_release(&_container.mutex);
+
+    return (alarm);
+}
+
+/** \brief rtc alarm service thread entry
+ *
+ */
+static void rt_alarmsvc_thread_init(void *param)
+{
+    rt_uint32_t recv;
+
+    rt_list_init(&_container.head);
+    rt_event_init(&_container.event, "alarmsvc", RT_IPC_FLAG_FIFO);
+    rt_mutex_init(&_container.mutex, "alarmsvc", RT_IPC_FLAG_FIFO);
+    _container.current = RT_NULL;
+
+    while (1)
+    {
+        if (rt_event_recv(&_container.event, 0xFFFF,
+                          RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
+                          RT_WAITING_FOREVER, &recv) == RT_EOK)
+        {
+            alarm_update(recv);           
+        }
+    }
+}
+
+
+/** \brief initialize alarm service system
+ *
+ * \param none
+ * \return none
+ */
+void rt_alarm_system_init(void)
+{
+    rt_thread_t tid;
+
+    tid = rt_thread_create("alarmsvc",
+                           rt_alarmsvc_thread_init, RT_NULL,
+                           512, 8, 1);
+    if (tid != RT_NULL)
+        rt_thread_startup(tid);
+}
+#endif