datetime.c

rtCell 实时微内核－具有下列功能： 1. 完全抢占的实时微内核结构

/*
 *******************************************************************************
 *                      The real-time kernel "rtCell"                          *
 *              Copyright 2005 taowentao, allrights reserved.                  *
 * File : DateTime.c                                                           *
 * By   : taowentao     2005-01-24 2005-08-27                                  *
 *******************************************************************************
 */
 
#if !defined(MCCLIB_H)
#include "giCell\Engine\mcCLib.h"
#endif

/*
 *******************************************************************************
 *                                                                             *
 *******************************************************************************
 */

static int epoch = 1900;

/*
 *******************************************************************************
 *                                                                             *
 *******************************************************************************
 */

#define RTC_SECONDS             (0)
#define RTC_MINUTES             (2)
#define RTC_HOURS               (4)

#define RTC_DAY_OF_WEEK         (6)
#define RTC_DAY_OF_MONTH        (7)
#define RTC_MONTH               (8)
#define RTC_YEAR                (9)

#define RTC_CONTROL     (11)

#define RTC_DM_BINARY   (0x04)

#define BCD2BIN(n) ((n >> 4) * 10 + (n & 0x0F))

/*
 *******************************************************************************
 *                                                                             *
 *******************************************************************************
 */

typedef struct Fd32Date
{
  WORD Year;
  BYTE Day;
  BYTE Mon;
  BYTE weekday;
}
rt_date_t;


typedef struct Fd32Time
{
  BYTE Min;
  BYTE Hour;
  BYTE Hund;
  BYTE Sec;
}
rt_time_t;

/*
 *******************************************************************************
 *                                                                             *
 *******************************************************************************
 */
 
BYTE cmos_read(BYTE addr)
{
    out_byte(0x70, addr);
    return in_byte(0x71);
}

int time_read(rt_time_t *t)
{
    BYTE ctrl;

    if (t == 0) {
        return -1;
    }

    t->Hund = 0; /* For the moment... */
    t->Sec = cmos_read(RTC_SECONDS);
    t->Min = cmos_read(RTC_MINUTES);
    t->Hour = cmos_read(RTC_HOURS);
    ctrl = cmos_read(RTC_CONTROL);
  

    if (!(ctrl & RTC_DM_BINARY)) {
        /* Convert from bcd to binary... */
        t->Sec = BCD2BIN(t->Sec);
        t->Min = BCD2BIN(t->Min);
        t->Hour = BCD2BIN(t->Hour);
    }

    return 1;
}

int date_read(rt_date_t *d)
{
    BYTE ctrl;

    if (d == 0) {
        return -1;
    }
    
    d->weekday = cmos_read(RTC_DAY_OF_WEEK);
    d->Day = cmos_read(RTC_DAY_OF_MONTH);
    d->Mon = cmos_read(RTC_MONTH);
    d->Year = cmos_read(RTC_YEAR);
    ctrl = cmos_read(RTC_CONTROL);

    if (!(ctrl & RTC_DM_BINARY)) {
        /* Convert from bcd to binary... */
        d->Day = BCD2BIN(d->Day);
        d->Mon = BCD2BIN(d->Mon);
        d->Year = BCD2BIN(d->Year);
    }
    
    d->Year += epoch - 1900;
    
    if (d->Year <= 69) {
        d->Year += 100;
    }
    d->Year += 1900;
  
    return 1;
}