yamt commented on a change in pull request #274: Improve sim timer
URL: https://github.com/apache/incubator-nuttx/pull/274#discussion_r379333291
 
 

 ##########
 File path: arch/sim/src/sim/up_rtc.c
 ##########
 @@ -0,0 +1,127 @@
+/****************************************************************************
+ * arch/sim/src/sim/up_rtc.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/timers/rtc.h>
+#include <nuttx/timers/arch_rtc.h>
+
+#include "up_internal.h"
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int sim_rtc_rdtime(FAR struct rtc_lowerhalf_s *lower,
+                          FAR struct rtc_time *rtctime);
+static int sim_rtc_settime(FAR struct rtc_lowerhalf_s *lower,
+                           FAR const struct rtc_time *rtctime);
+static bool sim_rtc_havesettime(FAR struct rtc_lowerhalf_s *lower);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct rtc_ops_s g_sim_rtc_ops =
+{
+  .rdtime      = sim_rtc_rdtime,
+  .settime     = sim_rtc_settime,
+  .havesettime = sim_rtc_havesettime,
+};
+
+static struct rtc_lowerhalf_s g_sim_rtc =
+{
+  .ops         = &g_sim_rtc_ops,
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int sim_rtc_rdtime(FAR struct rtc_lowerhalf_s *lower,
+                          FAR struct rtc_time *rtctime)
+{
+  uint64_t nsec;
+  time_t sec;
+
+
+  nsec = host_gettime(true);
+  sec  = nsec / NSEC_PER_SEC;
+  nsec -= sec * NSEC_PER_SEC;
+
+  gmtime_r(&sec, (FAR struct tm *)rtctime);
+  rtctime->tm_nsec = nsec;
+
+  return OK;
+}
+
+static int sim_rtc_settime(FAR struct rtc_lowerhalf_s *lower,
+                           FAR const struct rtc_time *rtctime)
+{
+  uint64_t nsec;
+
+  nsec = mktime((FAR struct tm *)rtctime);
+  nsec *= NSEC_PER_SEC;
+  nsec += rtctime->tm_nsec;
+  host_settime(true, nsec);
 
 Review comment:
   i think it's better to keep a diff from host os clock, rather than changing 
the host clock. how do you think?

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