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/**
* @file rtems/score/tod.h
*
* This include file contains all the constants and structures associated
* with the Time of Day Handler.
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#ifndef _RTEMS_SCORE_TOD_H
#define _RTEMS_SCORE_TOD_H
#ifdef __cplusplus
extern "C" {
#endif
#include <rtems/score/object.h>
#include <time.h>
/** @defgroup ScoreTODConstants TOD Constants
* The following constants are related to the time of day and are
* independent of RTEMS.
*/
/**@{*/
/**
* This constant represents the number of seconds in a minute.
*/
#define TOD_SECONDS_PER_MINUTE (uint32_t)60
/**
* This constant represents the number of minutes per hour.
*/
#define TOD_MINUTES_PER_HOUR (uint32_t)60
/**
* This constant represents the number of months in a year.
*/
#define TOD_MONTHS_PER_YEAR (uint32_t)12
/**
* This constant represents the number of days in a non-leap year.
*/
#define TOD_DAYS_PER_YEAR (uint32_t)365
/**
* This constant represents the number of hours per day.
*/
#define TOD_HOURS_PER_DAY (uint32_t)24
/**
* This constant represents the number of seconds in a day which does
* not include a leap second.
*/
#define TOD_SECONDS_PER_DAY (uint32_t) (TOD_SECONDS_PER_MINUTE * \
TOD_MINUTES_PER_HOUR * \
TOD_HOURS_PER_DAY)
/**
* This constant represents the number of seconds in a non-leap year.
*/
#define TOD_SECONDS_PER_NON_LEAP_YEAR (365 * TOD_SECONDS_PER_DAY)
/**
* This constant represents the number of millisecond in a second.
*/
#define TOD_MILLISECONDS_PER_SECOND (uint32_t)1000
/**
* This constant represents the number of microseconds in a second.
*/
#define TOD_MICROSECONDS_PER_SECOND (uint32_t)1000000
/**
* This constant represents the number of nanoseconds in a second.
*/
#define TOD_NANOSECONDS_PER_SECOND (uint32_t)1000000000
/**
* This constant represents the number of nanoseconds in a mircosecond.
*/
#define TOD_NANOSECONDS_PER_MICROSECOND (uint32_t)1000
/**@}*/
/**
* Seconds from January 1, 1970 to January 1, 1988. Used to account for
* differences between POSIX API and RTEMS core. The timespec format time
* is kept in POSIX compliant form.
*/
#define TOD_SECONDS_1970_THROUGH_1988 \
(((1987 - 1970 + 1) * TOD_SECONDS_PER_NON_LEAP_YEAR) + \
(4 * TOD_SECONDS_PER_DAY))
/** @brief Ticks per Second
*
* This macro calculates the number of ticks per second.
*/
#define TOD_TICKS_PER_SECOND \
(TOD_MICROSECONDS_PER_SECOND / _TOD_Microseconds_per_tick)
/** @brief RTEMS Epoch Year
*
* The following constant define the earliest year to which an
* time of day can be initialized. This is considered the
* epoch.
*/
#define TOD_BASE_YEAR 1988
/**
* @defgroup ScoreTOD Time Of Day (TOD) Handler
*
* This handler encapsulates functionality used to manage time of day.
*/
/**@{*/
/** @brief Is the Time Of Day Set
*
* This is TRUE if the application has set the current
* time of day, and FALSE otherwise.
*/
SCORE_EXTERN boolean _TOD_Is_set;
/** @brief Current Time of Day (Timespec)
* The following contains the current time of day.
*/
SCORE_EXTERN struct timespec _TOD_Now;
/** @brief Current Time of Day (Timespec)
* The following contains the running uptime.
*/
SCORE_EXTERN struct timespec _TOD_Uptime;
/** @brief Seconds Since RTEMS Epoch
* The following contains the number of seconds from 00:00:00
* January 1, TOD_BASE_YEAR until the current time of day.
*/
#define _TOD_Seconds_since_epoch (_TOD_Now.tv_sec)
/** @brief Microseconds per Clock Tick
*
* The following contains the number of microseconds per tick.
*/
SCORE_EXTERN uint32_t _TOD_Microseconds_per_tick;
/** @brief _TOD_Handler_initialization
*
* This routine performs the initialization necessary for this handler.
*/
void _TOD_Handler_initialization(
uint32_t microseconds_per_tick
);
/** @brief _TOD_Set
*
* This routine sets the current time of day to @a time and
* the equivalent SECONDS_SINCE_EPOCH.
*/
void _TOD_Set(
const struct timespec *time
);
/** @brief _TOD_Get
*
* This routine returns the current time of day with potential accuracy
* to the nanosecond.
*
* @param[in] time is a pointer to the time to be returned
*/
void _TOD_Get(
struct timespec *time
);
/** @brief _TOD_Get_uptime
*
* This routine returns the system uptime with potential accuracy
* to the nanosecond.
*
* @param[in] time is a pointer to the uptime to be returned
*/
void _TOD_Get_uptime(
struct timespec *time
);
/**
* This routine increments the ticks field of the current time of
* day at each clock tick.
*/
void _TOD_Tickle_ticks( void );
/** @brief TOD_MILLISECONDS_TO_MICROSECONDS
*
* This routine converts an interval expressed in milliseconds to microseconds.
*
* @note This must be a macro so it can be used in "static" tables.
*/
#define TOD_MILLISECONDS_TO_MICROSECONDS(_ms) ((uint32_t)(_ms) * 1000L)
/** @brief TOD_MICROSECONDS_TO_TICKS
*
* This routine converts an interval expressed in microseconds to ticks.
*
* @note This must be a macro so it can be used in "static" tables.
*/
#define TOD_MICROSECONDS_TO_TICKS(_us) \
((_us) / _TOD_Microseconds_per_tick)
/** @brief TOD_MILLISECONDS_TO_TICKS
*
* This routine converts an interval expressed in milliseconds to ticks.
*
* @note This must be a macro so it can be used in "static" tables.
*/
#define TOD_MILLISECONDS_TO_TICKS(_ms) \
(TOD_MILLISECONDS_TO_MICROSECONDS(_ms) / _TOD_Microseconds_per_tick)
/** @brief How many ticks in a second?
*
* This macro returns the number of ticks in a second.
*
* @note If the clock tick value does not multiply evenly into a second
* then this number of ticks will be slightly shorter than a second.
*/
#define TOD_TICKS_PER_SECOND \
(TOD_MICROSECONDS_PER_SECOND / _TOD_Microseconds_per_tick)
#ifndef __RTEMS_APPLICATION__
#include <rtems/score/tod.inl>
#endif
#ifdef __cplusplus
}
#endif
/**@}*/
#endif
/* end of include file */
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