126e46a1e7
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5612 42af7a65-404d-4744-a932-0658087f49c3
271 lines
8.2 KiB
C
271 lines
8.2 KiB
C
/****************************************************************************
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* sched/clock_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <nuttx/compiler.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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#ifdef CONFIG_RTC
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# include <arch/irq.h>
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#endif
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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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/****************************************************************************
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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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#ifdef CONFIG_SYSTEM_TIME64
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volatile uint64_t g_system_timer;
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uint64_t g_tickbias;
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#else
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volatile uint32_t g_system_timer;
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uint32_t g_tickbias;
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#endif
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struct timespec g_basetime;
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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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* Name: clock_basetime
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*
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* Description:
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* Get the initial time value from the best source available.
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*
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****************************************************************************/
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#ifdef CONFIG_RTC
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#if defined(CONFIG_RTC_DATETIME)
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/* Initialize the system time using a broken out date/time structure */
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static inline void clock_basetime(FAR struct timespec *tp)
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{
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struct tm rtctime;
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/* Get the broken-out time from the date/time RTC. */
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(void)up_rtc_getdatetime(&rtctime);
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/* And use the broken-out time to initialize the system time */
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tp->tv_sec = mktime(&rtctime);
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tp->tv_nsec = 0;
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}
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#elif defined(CONFIG_RTC_HIRES)
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/* Initialize the system time using a high-resolution structure */
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static inline void clock_basetime(FAR struct timespec *tp)
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{
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/* Get the complete time from the hi-res RTC. */
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(void)up_rtc_gettime(tp);
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}
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#else
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/* Initialize the system time using seconds only */
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static inline void clock_basetime(FAR struct timespec *tp)
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{
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/* Get the seconds (only) from the lo-resolution RTC */
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tp->tv_sec = up_rtc_time();
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tp->tv_nsec = 0;
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}
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#endif /* CONFIG_RTC_HIRES */
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#else /* CONFIG_RTC */
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static inline void clock_basetime(FAR struct timespec *tp)
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{
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time_t jdn = 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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tp->tv_sec = jdn * SEC_PER_DAY;
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tp->tv_nsec = 0;
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}
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#endif /* CONFIG_RTC */
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/****************************************************************************
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* Name: clock_inittime
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*
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* Description:
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* Get the initial time value from the best source available.
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*
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****************************************************************************/
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static void clock_inittime(void)
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{
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/* (Re-)initialize the time value to match the RTC */
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clock_basetime(&g_basetime);
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g_system_timer = 0;
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g_tickbias = 0;
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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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* Name: 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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/* Initialize the RTC hardware */
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#ifdef CONFIG_RTC
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up_rtcinitialize();
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#endif
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/* Initialize the time value to match the RTC */
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clock_inittime();
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}
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/****************************************************************************
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* Name: clock_synchronize
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*
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* Description:
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* Synchronize the system timer to a hardware RTC. This operation is
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* normally performed automatically by the system during clock
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* initialization. However, the user may also need to explicitly re-
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* synchronize the system timer to the RTC under certain conditions where
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* the system timer is known to be in error. For example, in certain low-
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* power states, the system timer may be stopped but the RTC will continue
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* keep correct time. After recovering from such low-power state, this
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* function should be called to restore the correct system time.
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*
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* Calling this function could result in system time going "backward" in
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* time, especially with certain lower resolution RTC implementations.
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* Time going backward could have bad consequences if there are ongoing
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* timers and delays. So use this interface with care.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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#ifdef CONFIG_RTC
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void clock_synchronize(void)
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{
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irqstate_t flags;
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/* Re-initialize the time value to match the RTC */
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flags = irqsave();
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clock_inittime();
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irqrestore(flags);
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}
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#endif
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/****************************************************************************
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* Name: 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 time clock
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* interrupt occurs. The interval of this clock interrupt must be
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* 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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g_system_timer++;
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}
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