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/****************************************************************************
* sched/clock_initialize.c
*
* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/clock.h>
#include <nuttx/time.h>
#include <nuttx/rtc.h>
#include "clock_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Standard time definitions (in units of seconds) */
#define SEC_PER_MIN ((time_t)60)
#define SEC_PER_HOUR ((time_t)60 * SEC_PER_MIN)
#define SEC_PER_DAY ((time_t)24 * SEC_PER_HOUR)
/* Macro to increment the system timer -- or not */
#ifndef CONFIG_SYSTEM_UTC
# define incr_systimer() g_system_timer++
#else
# define incr_systimer()
#endif
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/**************************************************************************
* Public Constant Data
**************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
#if CONFIG_SYSTEM_UTC
volatile time_t g_system_utc = 0;
#else
volatile clock_t g_system_timer = 0;
struct timespec g_basetime = {0,0};
uint32_t g_tickbias = 0;
#endif
/**************************************************************************
* Private Variables
**************************************************************************/
/* This variable is used to count ticks and to increment the one-second
* UTC variable.
*/
#if CONFIG_SYSTEM_UTC
#if TICK_PER_SEC > 32767
volatile uint32_t g_tickcount = 0;
#elif TICK_PER_SEC > 255
volatile uint16_t g_tickcount = 0;
#else
volatile uint8_t g_tickcount = 0;
#endif
#endif /* CONFIG_SYSTEM_UTC */
/**************************************************************************
* Private Functions
**************************************************************************/
/****************************************************************************
* Function: clock_timer
*
* Description:
* This function must be called once every time the real
* time clock interrupt occurs. The interval of this
* clock interrupt must be MSEC_PER_TICK
*
****************************************************************************/
#if CONFIG_SYSTEM_UTC
static inline void incr_utc(void)
{
g_tickcount++;
if (g_tickcount >= TICK_PER_SEC)
{
g_system_utc++;
g_tickcount -= TICK_PER_SEC;
}
}
#else
# define incr_utc()
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: clock_initialize
*
* Description:
* Perform one-time initialization of the timing facilities.
*
****************************************************************************/
void clock_initialize(void)
{
#ifndef CONFIG_SYSTEM_UTC
time_t jdn = 0;
#endif
/* Initialize the real time close (this should be un-nesssary except on a
* restart).
*/
#ifdef CONFIG_SYSTEM_UTC
g_system_utc = 0;
#else
g_system_timer = 0;
#endif
/* Do we have hardware RTC support? */
#ifdef CONFIG_RTC
#ifndef CONFIG_SYSTEM_UTC
# error In order to support hardware RTC system must have set the CONFIG_SYSTEM_UTC=y
#endif
up_rtcinitialize();
#endif
#ifndef CONFIG_SYSTEM_UTC
/* Get the EPOCH-relative julian date from the calendar year,
* month, and date
*/
jdn = clock_calendar2utc(CONFIG_START_YEAR, CONFIG_START_MONTH,
CONFIG_START_DAY);
/* Set the base time as seconds into this julian day. */
g_basetime.tv_sec = jdn * SEC_PER_DAY;
g_basetime.tv_nsec = 0;
/* These is no time bias from this time. */
g_tickbias = 0;
#endif
}
/****************************************************************************
* Function: clock_timer
*
* Description:
* This function must be called once every time the real
* time clock interrupt occurs. The interval of this
* clock interrupt must be MSEC_PER_TICK
*
****************************************************************************/
void clock_timer(void)
{
/* Increment the per-tick system counter */
incr_systimer();
/* Increment the per-second UTC counter */
incr_utc();
}
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