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Software-based calendar (RTC)

 
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PICoHolic



Joined: 04 Jan 2005
Posts: 213

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Software-based calendar (RTC)
PostPosted: Thu Mar 26, 2009 7:30 am     Reply with quote

Here's a software-based calendar. Timer 1 is fed from an external 32.768 KHz crystal.
The calendar will still run in sleep mode.

Any comments/modifications/enhancements are welcome!

Code:

#ifndef  CALENDAR_H
#define  CALENDAR_H
///////////////////////////////////////////////////////////////////////////////
#define  EnableCalendar()     enable_interrupts(INT_TIMER1)
#define  DisableCalendar()    disable_interrupts(INT_TIMER1)
///////////////////////////////////////////////////////////////////////////////
const char DaysStr[7][5] =    {"SUN\0", "MON\0", "TUE\0", "WED\0", "THU\0", "FRI\0", "SAT\0"};
const char MonthsStr[12][4]=  {"JAN", "FEB", "MAR", "ARP", "MAY", "JUN", "JUL",
                               "AUG", "SEP", "OCT", "NOV", "DEC"};
///////////////////////////////////////////////////////////////////////////////
#define IS_LEAP(year) (year%4 == 0)
///////////////////////////////////////////////////////////////////////////////
#define  AM    0
#define  PM    1
#define  H_12  0
#define  H_24  1
///////////////////////////////////////////////////////////////////////////////
typedef struct _calendar {
                  int8 Seconds;
                  int8 Minutes;
                  int8 Hours;
                  int8 DayOfWeek;
                  int8 Day;
                  int8 Month;
                  int8 Year;
                  int1 H_12_24;
                  int1 AM_PM;
                  }Calendar;
Calendar MyCalendar;
///////////////////////////////////////////////////////////////////////////////
void IncrementDate(void)
{
   MyCalendar.DayOfWeek = (MyCalendar.DayOfWeek % 7) + 1;   //increment day of week
   MyCalendar.Day++;    //increment day
   if (  (MyCalendar.Day == 29 && MyCalendar.Month==2 && !IS_LEAP(MyCalendar.Year))
           || (MyCalendar.Day == 30 && MyCalendar.Month==2)
           || (MyCalendar.Day == 31 && (MyCalendar.Month==4 || MyCalendar.Month==6
                                 || MyCalendar.Month==9 || MyCalendar.Month==11 ))
           || (MyCalendar.Day == 32) )
   {
      MyCalendar.Day=1;
      if(++MyCalendar.Month == 13)
      {
         MyCalendar.Month=1;
         MyCalendar.Year++;
      }
   }
}
///////////////////////////////////////////////////////////////////////////////
void IncrementTime(void)
{
   if (++MyCalendar.Seconds == 60)  //increment seconds
   {
      MyCalendar.Seconds = 0; //clear seconds
      if (++MyCalendar.Minutes == 60)  //increment minutes
      {
         MyCalendar.Minutes = 0; //clear minutes
         if (MyCalendar.H_12_24 == H_12) //12 hours
         {
            if (++MyCalendar.Hours == 13)
            {
               MyCalendar.Hours = 1;
               if (MyCalendar.AM_PM == AM)
               {
                  IncrementDate();
               }
            }
            else if (MyCalendar.Hours == 12)
            {
               MyCalendar.AM_PM ^= 1;
            }
         }
         else  //24 hours
         {
            if (++MyCalendar.Hours == 24)
            {
               MyCalendar.Hours = 0;
               IncrementDate();
            }
         }
      }
   }
}
///////////////////////////////////////////////////////////////////////////////
int1 Sflg;
///////////////////////////////////////////////////////////////////////////////
#int_TIMER1       //Real Time Clock
void TIMER1_isr()

   Bit_Set(TMR1H,7);     
   Sflg=true;
   IncrementTime();
   
   //one sec toggle
   //#ASM  btg PORTD, 4 #ENDASM
}
///////////////////////////////////////////////////////////////////////////////
void delay_s(int8 s)
{
   while(s--)
   {
      Sflg = false;
      while(!Sflg);
   }
}
///////////////////////////////////////////////////////////////////////////////
void init_Calendar()
{
   MyCalendar.Seconds = 00;
   MyCalendar.Minutes = 00;
   MyCalendar.Hours = 12;
   MyCalendar.DayOfWeek = 5;  //Thursday
   MyCalendar.Day = 1;        //1st
   MyCalendar.Month = 1;      //Jan
   MyCalendar.Year = 9;       //2009
   MyCalendar.H_12_24 = H_12; //12 hours
   MyCalendar.AM_PM = AM;     //AM
   
   bit_clear(T1CON,7);
   EnableCalendar();
}
///////////////////////////////////////////////////////////////////////////////
#endif
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Jan 11, 2012 4:47 pm     Reply with quote

Code:
const char DaysStr[7][5] =    {"SUN\0", "MON\0", "TUE\0", "WED\0", "THU\0", "FRI\0", "SAT\0"};
Quoted strings will be zero terminated by the compiler so this line can be simplified to:
Code:
const char DaysStr[7][4] =    {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
Or, remove the whole line as it isn't used.
MonthsStr[] isn't used either and can be removed too. Strange but here you have not added the extra terminating zero, so why did you do it to the other line?


Code:
   //one sec toggle
   //#ASM  btg PORTD, 4 #ENDASM
Easier to read and higher portability:
Code:
   //one sec toggle
   //output_toggle(PIN_D4);



Code:
void delay_s(int8 s)
{
   while(s--)
   {
      Sflg = false;
      while(!Sflg);
   }
}
Why bother to create your own blocking delay function? The CCS delay_ms() is not perfect, but your delay_s function is not synchronized to the interrupt and can be as far off as 0.99999 seconds. Then I rather use the delay_ms function which is accurate up to a few microseconds.
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