arch/m68k-amiga/battclock/readbattclock.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3
   4     Desc: ReadBattClock() function.
   5     Lang: english
   6 */
   7 #define DEBUG 0
   8
   9 #include <aros/debug.h>
  10 #include <aros/libcall.h>
  11 #include <aros/symbolsets.h>
  12
  13 #include <utility/date.h>
  14 #include <proto/utility.h>
  15
  16 #include "battclock_intern.h"
  17
  18 /*****************************************************************************
  19
  20     NAME */
  21 #include <proto/battclock.h>
  22
  23         AROS_LH0(ULONG, ReadBattClock,
  24
  25 /*  SYNOPSIS */
  26         /* void */
  27
  28 /*  LOCATION */
  29         struct BattClockBase*, BattClockBase, 2, Battclock)
  30
  31 /*  FUNCTION
  32         Return the value stored in the battery back up clock. This value
  33         is the number of seconds that have elapsed since midnight on the
  34         1st of January 1978 (00:00:00 1.1.1978).
  35
  36         If the value of the battery clock is invalid, then the clock will
  37         be reset.
  38
  39     INPUTS
  40
  41     RESULT
  42         The number of seconds since 1.1.1978 00:00:00
  43
  44     NOTES
  45
  46     EXAMPLE
  47
  48     BUGS
  49
  50     SEE ALSO
  51         WriteBattClock(), ResetBattClock()
  52
  53     INTERNALS
  54
  55     HISTORY
  56
  57 *****************************************************************************/
  58 {
  59     AROS_LIBFUNC_INIT
  60
  61     volatile UBYTE *p = BattClockBase->clockptr;
  62     struct UtilityBase *UtilityBase = BattClockBase->UtilityBase;
  63     struct ClockData cd;
  64     UBYTE reg;
  65     ULONG t;
  66
  67     D(bug("ReadBattClock\n"));
  68     if (!p)
  69         return 0;
  70     reg = 0;
  71     cd.sec = getbcd(p, reg);
  72     cd.min = getbcd(p, reg + 2);
  73     cd.hour = getbcd(p, reg + 4);
  74     if (BattClockBase->clocktype == MSM6242B)
  75         reg = 6;
  76     else
  77         reg = 7;
  78     cd.mday = getbcd(p, reg);
  79     cd.month = getbcd(p, reg + 2);
  80     cd.year = getbcd(p, reg + 4) + 1900;
  81     if (cd.year < 1978)
  82         cd.year += 100;
  83     cd.wday = 0;
  84     t = Date2Amiga(&cd);
  85     D(bug("%02d:%02d %02d.%02d.%d = %d\n", cd.hour, cd.min, cd.mday, cd.month, cd.year, t));
  86     return t;
  87
  88     AROS_LIBFUNC_EXIT
  89
  90 } /* ReadBattClock */