[ulog] Using gettimeofday for timestamp get.

components/utilities/ulog/ulog.c

@@ -260,19 +260,36 @@ RT_WEAK rt_size_t ulog_formater(char *log_buf, rt_uint32_t level, const char *ta
     /* add time info */
     {
 #ifdef ULOG_TIME_USING_TIMESTAMP
-        static time_t now;
+        static struct timeval now;
         static struct tm *tm, tm_tmp;
+        static rt_bool_t check_usec_support = RT_FALSE, usec_is_support = RT_FALSE;
 
-        now = time(NULL);
-        tm = gmtime_r(&now, &tm_tmp);
-
-#ifdef RT_USING_SOFT_RTC
-        rt_snprintf(log_buf + log_len, ULOG_LINE_BUF_SIZE - log_len, "%02d-%02d %02d:%02d:%02d.%03d", tm->tm_mon + 1,
-                tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, rt_tick_get() % 1000);
-#else
-        rt_snprintf(log_buf + log_len, ULOG_LINE_BUF_SIZE - log_len, "%02d-%02d %02d:%02d:%02d", tm->tm_mon + 1,
-                tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
-#endif /* RT_USING_SOFT_RTC */
+        if (gettimeofday(&now, NULL) >= 0)
+        {
+            time_t t = now.tv_sec;
+            tm = localtime_r(&t, &tm_tmp);
+            /* show the time format MM-DD HH:MM:SS */
+            rt_snprintf(log_buf + log_len, ULOG_LINE_BUF_SIZE - log_len, "%02d-%02d %02d:%02d:%02d", tm->tm_mon + 1,
+                    tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
+            /* check the microseconds support when kernel is startup */
+            if (!check_usec_support && rt_thread_self() != RT_NULL)
+            {
+                long old_usec = now.tv_usec;
+                /* delay some time for wait microseconds changed */
+                rt_thread_delay(2);
+                gettimeofday(&now, NULL);
+                check_usec_support = RT_TRUE;
+                /* the microseconds is not equal between two gettimeofday calls */
+                if (now.tv_usec != old_usec)
+                    usec_is_support = RT_TRUE;
+            }
+            if (usec_is_support)
+            {
+                /* show the millisecond */
+                log_len += rt_strlen(log_buf + log_len);
+                rt_snprintf(log_buf + log_len, ULOG_LINE_BUF_SIZE - log_len, ".%03d", now.tv_usec / 1000);
+            }
+        }
 
 #else
         static rt_size_t tick_len = 0;
@@ -321,7 +338,9 @@ RT_WEAK rt_size_t ulog_formater(char *log_buf, rt_uint32_t level, const char *ta
             rt_size_t name_len = 0;
             const char *thread_name = "N/A";
             if (rt_thread_self()->name)
+            {
                 thread_name = rt_thread_self()->name;
+            }
             name_len = rt_strnlen(thread_name, RT_NAME_MAX);
             rt_strncpy(log_buf + log_len, thread_name, name_len);
             log_len += name_len;