clk.c

《嵌入式系统构件》源代码

* Description : Set the date and time of the time-of-day clock
* Arguments   : month     is the desired month   (1..12)
*               day       is the desired day     (1..31)
*               year      is the desired year    (2xxx)
*               hr        is the desired hour    (0..23)
*               min       is the desired minutes (0..59)
*               sec       is the desired seconds (0..59)
* Returns     : None.
* Notes       : It is assumed that you are specifying a correct date and time (i.e. there is no range
*               checking done by this function).
*********************************************************************************************************
*/

#if  CLK_DATE_EN
void  ClkSetDateTime (INT8U month, INT8U day, INT16U year, INT8U hr, INT8U min, INT8U sec)
{
    INT8U err;


    OSSemPend(ClkSem, 0, &err);                  /* Gain exclusive access to time-of-day clock         */
    ClkMonth = month;
    ClkDay   = day;
    ClkYear  = year;
    ClkHr    = hr;
    ClkMin   = min;
    ClkSec   = sec;
    ClkUpdateDOW();                              /* Compute the day of the week (i.e. Sunday ...)      */
    OSSemPost(ClkSem);                           /* Release access to time-of-day clock                */
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                          SET TIME ONLY
*
* Description : Set the time-of-day clock
* Arguments   : hr        is the desired hour    (0..23)
*               min       is the desired minutes (0..59)
*               sec       is the desired seconds (0..59)
* Returns     : None.
* Notes       : It is assumed that you are specifying a correct time (i.e. there is no range checking
*               done by this function).
*********************************************************************************************************
*/

void  ClkSetTime (INT8U hr, INT8U min, INT8U sec)
{
    OS_ENTER_CRITICAL();                         /* Gain exclusive access to time-of-day clock         */
    ClkHr  = hr;
    ClkMin = min;
    ClkSec = sec;
    OS_EXIT_CRITICAL();                          /* Release access to time-of-day clock                */
}

/*$PAGE*/
/*
*********************************************************************************************************
*                          SIGNAL CLOCK MODULE THAT A 'CLOCK TICK' HAS OCCURRED
*
* Description : This function is called by the 'clock tick' ISR on every tick.  This function is thus
*               responsible for counting the number of clock ticks per second.  When a second elapses,
*               this function will signal the time-of-day clock task.
* Arguments   : None.
* Returns     : None.
* Note(s)     : CLK_DLY_TICKS must be set to the number of ticks to produce 1 second.  
*               This would typically correspond to OS_TICKS_PER_SEC if you use uC/OS-II.
*********************************************************************************************************
*/

void  ClkSignalClk (void)
{
    ClkTickCtr++;                           /* count the number of 'clock ticks' for one second        */
    if (ClkTickCtr >= CLK_DLY_TICKS) {
        ClkTickCtr = 0;
        OSSemPost(ClkSemSec);               /* Signal that one second elapsed                          */
    }
}

/*
*********************************************************************************************************
*                                        TIME-OF-DAY CLOCK TASK
*
* Description : This task is created by ClkInit() and is responsible for updating the time and date.
*               ClkTask() executes every second.
* Arguments   : None.
* Returns     : None.
* Notes       : CLK_DLY_TICKS must be set to produce 1 second delays.
*********************************************************************************************************
*/

void  ClkTask (void *data)
{
    INT8U err;


    data = data;                            /* Avoid compiler warning (uC/OS requirement)              */
    for (;;) {

#if CLK_USE_DLY
        OSTimeDlyHMSM(0, 0, 1, 0);          /* Delay for one second                                    */
#else
        OSSemPend(ClkSemSec, 0, &err);      /* Wait for one second to elapse                           */
#endif

        OSSemPend(ClkSem, 0, &err);         /* Gain exclusive access to time-of-day clock              */
        if (ClkUpdateTime() == TRUE) {      /* Update the TIME (i.e. HH:MM:SS)                         */
#if CLK_DATE_EN
            ClkUpdateDate();                /* And date if a new day (i.e. MM-DD-YY)                   */
#endif
        }
#if CLK_TS_EN && CLK_DATE_EN
        ClkTS = ClkMakeTS(ClkMonth, ClkDay, ClkYear, ClkHr, ClkMin, ClkSec);
#endif
        OSSemPost(ClkSem);                  /* Release access to time-of-day clock                     */
    }
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                            UPDATE THE DATE
*
* Description : This function is called to update the date (i.e. month, day and year)
* Arguments   : None.
* Returns     : None.
* Notes       : This function updates ClkDay, ClkMonth, ClkYear and ClkDOW.
*********************************************************************************************************
*/

#if CLK_DATE_EN
static  void  ClkUpdateDate (void)
{
    BOOLEAN newmonth;


    newmonth = TRUE;
    if (ClkDay >= ClkMonthTbl[ClkMonth].MonthDays) {  /* Last day of the month?                        */
        if (ClkMonth == 2) {                          /* Is this February?                             */
            if (ClkIsLeapYear(ClkYear) == TRUE) {     /* Yes, Is this a leap year?                     */
                if (ClkDay >= 29) {                   /* Yes, Last day in february?                    */
                    ClkDay = 1;                       /* Yes, Set to 1st day in March                  */
                } else {
                    ClkDay++;
                    newmonth = FALSE;
                }
            } else {
                ClkDay = 1;
            }
        } else {
            ClkDay = 1;
        }
    } else {
        ClkDay++;
        newmonth = FALSE;
    }
    if (newmonth == TRUE) {                      /* See if we have completed a month                   */
        if (ClkMonth >= 12) {                    /* Yes, Is this december ?                            */
            ClkMonth = 1;                        /* Yes, set month to january...                       */
            ClkYear++;                           /*      ...we have a new year!                        */
        } else {
            ClkMonth++;                          /* No,  increment the month                           */
        }
    }
    ClkUpdateDOW();                              /* Compute the day of the week (i.e. Sunday ...)      */
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                         COMPUTE DAY-OF-WEEK
*
* Description : This function computes the day of the week (0 == Sunday) based on the current month,
*               day and year.
* Arguments   : None.
* Returns     : None.
* Notes       : - This function updates ClkDOW.
*               - This function is called by ClkUpdateDate().
*********************************************************************************************************
*/
#if CLK_DATE_EN
static  void  ClkUpdateDOW (void)
{
    INT16U dow;


    dow = ClkDay + ClkMonthTbl[ClkMonth].MonthVal;
    if (ClkMonth < 3) {
        if (ClkIsLeapYear(ClkYear)) {
            dow--;
        }
    }
    dow    += ClkYear + (ClkYear / 4);
    dow    += (ClkYear / 400) - (ClkYear / 100);
    dow    %= 7;
    ClkDOW  = dow;
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                            UPDATE THE TIME
*
* Description : This function is called to update the time (i.e. hours, minutes and seconds)
* Arguments   : None.
* Returns     : TRUE     if we have completed one day.
*               FALSE    otherwise
* Notes       : This function updates ClkSec, ClkMin and ClkHr.
*********************************************************************************************************
*/

static  BOOLEAN  ClkUpdateTime (void)
{
    BOOLEAN newday;


    newday = FALSE;                         /* Assume that we haven't completed one whole day yet      */
    if (ClkSec >= 59) {                     /* See if we have completed one minute yet                 */
        ClkSec = 0;                         /* Yes, clear seconds                                      */
        if (ClkMin >= 59) {                 /*    See if we have completed one hour yet                */
            ClkMin = 0;                     /*    Yes, clear minutes                                   */
            if (ClkHr >= 23) {              /*        See if we have completed one day yet             */
                ClkHr = 0;                  /*        Yes, clear hours ...                             */
                newday    = TRUE;           /*        ... change flag to indicate we have a new day    */
            } else {
                ClkHr++;                    /*        No,  increment hours                             */
            }
        } else {
            ClkMin++;                       /*    No,  increment minutes                               */
        }
    } else {
        ClkSec++;                           /* No,  increment seconds                                  */
    }
    return (newday);
}