NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
2026-06-06 08:36:24 +08:00 · 2007-02-17 23:21:28 +00:00
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+/************************************************************
+ * clock_initialize.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <sys/types.h>
+#include <time.h>
+#include <errno.h>
+#include <debug.h>
+#include "clock_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Type Declarations
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+/**********************************************************
+ * Public Constant Data
+ **********************************************************/
+
+/************************************************************
+ * Public Variables
+ ************************************************************/
+
+volatile uint32 g_system_timer = 0;
+struct timespec g_basetime = {0,0};
+uint32 g_tickbias = 0;
+
+/**********************************************************
+ * Private Variables
+ **********************************************************/
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Function: clock_initialize
+ *
+ * Description:
+ *   Perform one-time initialization of the timing facilities.
+ *
+ ************************************************************/
+
+void clock_initialize(void)
+{
+  time_t jdn;
+
+  /* Initialize the real time close */
+
+  g_system_timer = 0;
+
+  /* Get the EPOCH-relative julian date from the calendar year,
+   * month, and date
+   */
+
+  jdn = clock_calendar2utc(CONFIG_START_YEAR, CONFIG_START_MONTH,
+                           CONFIG_START_DAY);
+
+  /* Set the base time as seconds into this julian day. */
+
+  g_basetime.tv_sec  = jdn * (24*60*60);
+  g_basetime.tv_nsec = 0;
+
+  /* These is no time bias from this time. */
+
+  g_tickbias = 0;
+}
+
+/************************************************************
+ * Function: clock_timer
+ *
+ * Description:
+ *   This function must be called once every time the real
+ *   time clock interrupt occurs.  The interval of this
+ *   clock interrupt must be MSEC_PER_TICK
+ *
+ ************************************************************/
+
+void clock_timer(void)
+{
+   g_system_timer++;
+}