12ae4d2bd7
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2336 42af7a65-404d-4744-a932-0658087f49c3
137 lines
4.9 KiB
C
137 lines
4.9 KiB
C
/****************************************************************************
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* sched/clock_initialize.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/time.h>
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#include "clock_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define SEC_PER_MIN ((time_t)60)
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#define SEC_PER_HOUR ((time_t)60 * SEC_PER_MIN)
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#define SEC_PER_DAY ((time_t)24 * SEC_PER_HOUR)
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/**************************************************************************
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* Public Constant Data
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**************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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volatile uint32_t g_system_timer = 0;
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struct timespec g_basetime = {0,0};
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uint32_t g_tickbias = 0;
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/**************************************************************************
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* Private Variables
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**************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: clock_initialize
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*
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* Description:
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* Perform one-time initialization of the timing facilities.
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*
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****************************************************************************/
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void clock_initialize(void)
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{
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time_t jdn;
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/* Initialize the real time close */
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g_system_timer = 0;
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/* Get the EPOCH-relative julian date from the calendar year,
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* month, and date
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*/
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jdn = clock_calendar2utc(CONFIG_START_YEAR, CONFIG_START_MONTH,
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CONFIG_START_DAY);
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/* Set the base time as seconds into this julian day. */
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g_basetime.tv_sec = jdn * SEC_PER_DAY;
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g_basetime.tv_nsec = 0;
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/* These is no time bias from this time. */
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g_tickbias = 0;
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}
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/****************************************************************************
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* Function: clock_timer
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*
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* Description:
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* This function must be called once every time the real
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* time clock interrupt occurs. The interval of this
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* clock interrupt must be MSEC_PER_TICK
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*
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****************************************************************************/
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void clock_timer(void)
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{
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g_system_timer++;
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}
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