CCS :: View topic - Software-based calendar (RTC)

FAQ

Forum Help

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support

Software-based calendar (RTC)

CCS Forum Index -> Code Library

View previous topic :: View next topic

Author

Message

PICoHolic

Joined: 04 Jan 2005
Posts: 224

Software-based calendar (RTC)

Posted: Thu Mar 26, 2009 7:30 am

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

Posted: Wed Jan 11, 2012 4:47 pm

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.

Display posts from previous:

	CCS Forum Index -> Code Library	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum