[DeviceDriver] Add NTP auto sync time for RTC device.

components/drivers/rtc/rtc.c

@@ -22,16 +22,31 @@
  * 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.
+ * 2018-02-16     armink       add auto sync time by NTP
  */
 
 #include <time.h>
 #include <string.h>
 #include <rtthread.h>
 
-/** \brief returns the current time.
+/* Using NTP auto sync RTC time */
+#ifdef RTC_SYNC_USING_NTP
+/* NTP first sync delay time for network connect, unit: second */
+#ifndef RTC_NTP_FIRST_SYNC_DELAY
+#define RTC_NTP_FIRST_SYNC_DELAY                 (30)
+#endif
+/* NTP sync period, unit: second */
+#ifndef RTC_NTP_SYNC_PERIOD
+#define RTC_NTP_SYNC_PERIOD                      (1L*60L*60L)
+#endif
+#endif /* RTC_SYNC_USING_NTP */
+
+/**
+ * Returns the current time.
+ *
+ * @param time_t * t the timestamp pointer, if not used, keep NULL.
  *
- * \param time_t * t the timestamp pointer, if not used, keep NULL.
- * \return time_t return timestamp current.
+ * @return time_t return timestamp current.
  *
  */
 /* for IAR 6.2 later Compiler */
@@ -70,12 +85,14 @@ time_t time(time_t *t)
     return time_now;
 }
 
-/** \brief set system date(time not modify).
+/**
+ * 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.
+ * @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: 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)
@@ -118,12 +135,14 @@ rt_err_t set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
     return ret;
 }
 
-/** \brief set system time(date not modify).
+/**
+ * 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.
  *
- * \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.
+ * @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)
@@ -166,6 +185,45 @@ rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
     return ret;
 }
 
+#ifdef RTC_SYNC_USING_NTP
+static void ntp_sync_thread_enrty(void *param)
+{
+    extern time_t ntp_sync_to_rtc(void);
+    /* first sync delay for network connect */
+    rt_thread_delay(RTC_NTP_FIRST_SYNC_DELAY * RT_TICK_PER_SECOND);
+
+    while (1)
+    {
+        ntp_sync_to_rtc();
+        rt_thread_delay(RTC_NTP_SYNC_PERIOD * RT_TICK_PER_SECOND);
+    }
+}
+
+int rt_rtc_ntp_sync_init(void)
+{
+    static rt_bool_t init_ok = RT_FALSE;
+    rt_thread_t thread;
+
+    if (init_ok)
+    {
+        return 0;
+    }
+
+    thread = rt_thread_create("ntp_sync", ntp_sync_thread_enrty, RT_NULL, 1536, 26, 2);
+    if (thread)
+    {
+        rt_thread_startup(thread);
+    }
+    else
+    {
+        return -RT_ENOMEM;
+    }
+
+    init_ok = RT_TRUE;
+}
+INIT_COMPONENT_EXPORT(rt_rtc_ntp_sync_init);
+#endif /* RTC_SYNC_USING_NTP */
+
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 #include <rtdevice.h>
@@ -181,4 +239,5 @@ 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
+
+#endif /* RT_USING_FINSH */