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270 lines
8.2 KiB
270 lines
8.2 KiB
/**************************************************************************** |
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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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