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Zero Drift RTC by: Neutone

 
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rrb011270



Joined: 07 Sep 2003
Posts: 51

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Zero Drift RTC by: Neutone
PostPosted: Sun Dec 21, 2003 9:04 pm     Reply with quote
Mabuhay!

Anybody in the forum who can provide me with the code snippet of the zero drift RTC by: neutone..

I do search the forum unfortuntely, the links is an error... I guess it was posted on the old forum...

Thank u
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Mon Dec 22, 2003 4:58 am     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=11449&highlight=zero+drift+rtc
Neutone



Joined: 08 Sep 2003
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Re: Zero Drift RTC by: Neutone
PostPosted: Mon Dec 22, 2003 8:58 am     Reply with quote
rrb011270 wrote:
Mabuhay!

Anybody in the forum who can provide me with the code snippet of the zero drift RTC by: neutone..

I do search the forum unfortuntely, the links is an error... I guess it was posted on the old forum...

Thank u


Code:

/*********************************************
*    Initialize RTC                          *
*********************************************/
void Initialize_RTC(void)
{  Ticker = XTAL_FREQUENCY;
   setup_timer_2 ( T2_DIV_BY_4, 0xff, 4 );   // initialize 8 bit counter/timer 2 to interupt every 16384 clock cycles
   enable_interrupts( INT_TIMER2 );          // Start RTC
}

// Global Real Time Clock Information
#int_TIMER2                                  // Clock interrupt adjusted to occurs ~ 1ms
void TIMER2_isr()                            //  -=Process Zero Drift Real Time Clock Information=-
{  tickmSec = 1;                             // set each MS very approximately
   Ticker -= 16384;                          // Decrement ticker by clocks per interupt
   if ( Ticker < 16384 )                     // If second has expired
   {  Ticker += XTAL_FREQUENCY;              // Increment ticker by clocks per second
      second++;                              // Increment number of seconds
      tickSec = 1;                           // set each Second very accuratly
   }
}
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