[DeviceDriver][RTC] Add software simulation RTC device.

components/drivers/rtc/SConscript

@@ -7,6 +7,8 @@ rtc = ['rtc.c']
 
 rtc_alarm = ['alarm.c']
 
+soft_rtc = ['soft_rtc.c']
+
 CPPPATH = [cwd + '/../include']
 group = []
 
@@ -14,6 +16,8 @@ if GetDepend(['RT_USING_RTC']):
     src = src + rtc
     if GetDepend(['RT_USING_ALARM']): 
         src = src + rtc_alarm
+    if GetDepend(['RT_USING_SOFT_RTC']): 
+        src = src + soft_rtc
 
 group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_RTC'], CPPPATH = CPPPATH)
 

components/drivers/rtc/soft_rtc.c

@@ -0,0 +1,107 @@
+/*
+ * File      : soft_rtc.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-01-30     armink       the first version
+ */
+
+#include <time.h>
+#include <string.h>
+#include <rtthread.h>
+
+#include <drivers/rtc.h>
+
+#ifdef RT_USING_SOFT_RTC
+
+/* 2018-01-30 14:44:50 = RTC_TIME_INIT(2018, 1, 30, 14, 44, 50)  */
+#define RTC_TIME_INIT(year, month, day, hour, minute, second)        \
+    {.tm_year = year - 1900, .tm_mon = month - 1, .tm_mday = day, .tm_hour = hour, .tm_min = minute, .tm_sec = second}
+
+#ifndef SOFT_RTC_TIME_DEFAULT
+#define SOFT_RTC_TIME_DEFAULT                    RTC_TIME_INIT(2018, 1, 1, 0, 0 ,0)
+#endif
+
+static struct rt_device soft_rtc_dev;
+static rt_tick_t init_tick;
+static time_t init_time;
+
+static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
+{
+    time_t *time;
+    struct tm time_temp;
+
+    RT_ASSERT(dev != RT_NULL);
+    memset(&time_temp, 0, sizeof(struct tm));
+
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_RTC_GET_TIME:
+        time = (time_t *) args;
+        *time = init_time + (rt_tick_get() - init_tick) / RT_TICK_PER_SECOND;
+        break;
+
+    case RT_DEVICE_CTRL_RTC_SET_TIME:
+    {
+        time = (time_t *) args;
+        init_time = *time - (rt_tick_get() - init_tick) / RT_TICK_PER_SECOND;
+        break;
+    }
+    }
+
+    return RT_EOK;
+}
+
+int rt_soft_rtc_init(void)
+{
+    static rt_bool_t init_ok = RT_FALSE;
+    struct tm time_new = SOFT_RTC_TIME_DEFAULT;
+
+    if (init_ok)
+    {
+        return 0;
+    }
+    /* make sure only one 'rtc' device */
+    RT_ASSERT(!rt_device_find("rtc"));
+
+    init_tick = rt_tick_get();
+    init_time = mktime(&time_new);
+
+    soft_rtc_dev.type    = RT_Device_Class_RTC;
+
+    /* register rtc device */
+    soft_rtc_dev.init    = RT_NULL;
+    soft_rtc_dev.open    = RT_NULL;
+    soft_rtc_dev.close   = RT_NULL;
+    soft_rtc_dev.read    = RT_NULL;
+    soft_rtc_dev.write   = RT_NULL;
+    soft_rtc_dev.control = soft_rtc_control;
+
+    /* no private */
+    soft_rtc_dev.user_data = RT_NULL;
+
+    rt_device_register(&soft_rtc_dev, "rtc", RT_DEVICE_FLAG_RDWR);
+
+    init_ok = RT_TRUE;
+
+    return 0;
+}
+INIT_DEVICE_EXPORT(rt_soft_rtc_init);
+
+#endif /* RT_USING_SOFT_RTC */