[drivers][rtc]Add get/set timestamp function

components/drivers/include/drivers/rtc.h

@@ -51,6 +51,8 @@ rt_err_t rt_hw_rtc_register(rt_rtc_dev_t  *rtc,
 
 rt_err_t set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day);
 rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second);
+rt_err_t set_timestamp(time_t timestamp);
+rt_err_t get_timestamp(time_t *timestamp);
 
 #ifdef __cplusplus
 }

components/drivers/rtc/rtc.c

@@ -228,6 +228,49 @@ rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
     return ret;
 }
 
+/**
+ * Set timestamp(utc).
+ *
+ * @param time_t timestamp
+ *
+ * @return rt_err_t if set success, return RT_EOK.
+ */
+rt_err_t set_timestamp(time_t timestamp)
+{
+    if (_rtc_device == RT_NULL)
+    {
+        _rtc_device = rt_device_find("rtc");
+        if (_rtc_device == RT_NULL)
+        {
+            return -RT_ERROR;
+        }
+    }
+
+    /* update to RTC device. */
+    return rt_device_control(_rtc_device, RT_DEVICE_CTRL_RTC_SET_TIME, &timestamp);
+}
+
+/**
+ * Get timestamp(utc).
+ *
+ * @param time_t* timestamp
+ *
+ * @return rt_err_t if set success, return RT_EOK.
+ */
+rt_err_t get_timestamp(time_t *timestamp)
+{
+    if (_rtc_device == RT_NULL)
+    {
+        _rtc_device = rt_device_find("rtc");
+        if (_rtc_device == RT_NULL)
+        {
+            return -RT_ERROR;
+        }
+    }
+
+    /* Get timestamp from RTC device. */
+    return rt_device_control(_rtc_device, RT_DEVICE_CTRL_RTC_GET_TIME, timestamp);
+}
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>