224 lines
6.8 KiB
C
224 lines
6.8 KiB
C
/****************************************************************************
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* sched/clock_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011 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/clock.h>
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#include <nuttx/time.h>
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#include <nuttx/rtc.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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/* Standard time definitions (in units of seconds) */
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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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/* Macro to increment the system timer -- or not */
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#ifndef CONFIG_SYSTEM_UTC
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# define incr_systimer() g_system_timer++
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#else
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# define incr_systimer()
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#endif
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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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#if CONFIG_SYSTEM_UTC
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volatile time_t g_system_utc = 0;
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#else
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volatile clock_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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#endif
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/**************************************************************************
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* Private Variables
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**************************************************************************/
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/* This variable is used to count ticks and to increment the one-second
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* UTC variable.
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*/
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#if CONFIG_SYSTEM_UTC
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#if TICK_PER_SEC > 32767
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volatile uint32_t g_tickcount = 0;
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#elif TICK_PER_SEC > 255
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volatile uint16_t g_tickcount = 0;
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#else
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volatile uint8_t g_tickcount = 0;
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#endif
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#endif /* CONFIG_SYSTEM_UTC */
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/**************************************************************************
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* Private Functions
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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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#if CONFIG_SYSTEM_UTC
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static inline void incr_utc(void)
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{
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g_tickcount++;
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if (g_tickcount >= TICK_PER_SEC)
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{
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g_system_utc++;
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g_tickcount -= TICK_PER_SEC;
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}
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}
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#else
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# define incr_utc()
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#endif
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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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#ifndef CONFIG_SYSTEM_UTC
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time_t jdn = 0;
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#endif
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/* Initialize the real time close (this should be un-nesssary except on a
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* restart).
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*/
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#ifdef CONFIG_SYSTEM_UTC
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g_system_utc = 0;
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#else
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g_system_timer = 0;
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#endif
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/* Do we have hardware RTC support? */
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#ifdef CONFIG_RTC
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#ifndef CONFIG_SYSTEM_UTC
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# error In order to support hardware RTC system must have set the CONFIG_SYSTEM_UTC=y
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#endif
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up_rtcinitialize();
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#endif
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#ifndef CONFIG_SYSTEM_UTC
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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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#endif
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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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/* Increment the per-tick system counter */
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incr_systimer();
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/* Increment the per-second UTC counter */
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incr_utc();
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}
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