rtc.c

矿工定位系统单端

//rtc.c - code recommendation for C header file
/***********************************************************************
MODULE:    Real Time Clock
VERSION:   1.00
CONTAINS:  Routines for controlling the Real Time Clock/System Timer
           on the Philips P89LPC932
COPYRIGHT: Embedded Systems Academy, Inc. - www.esacademy.com
LICENSE:   May be freely used in commercial and non-commercial code
           without royalties provided this copyright notice remains
           in this file and unaltered
WARNING:   IF THIS FILE IS REGENERATED BY CODE ARCHITECT ANY CHANGES
           MADE WILL BE LOST. WHERE POSSIBLE USE ONLY CODE ARCHITECT
           TO CHANGE THE CONTENTS OF THIS FILE
GENERATED: On "Feb 24 2004" at "16:21:01" by Code Architect 2.03
***********************************************************************/

// SFR description needs to be included
#include<REG922.h>
#include "rtc.h"
#include "watchdogrtc.h"

/***********************************************************************
DESC:    Initializes the Real Time Clock and starts it running
         Generates an interrupt every 1.997ms
         Clock source: CPU Clock at 7.3728 MHz
RETURNS: Nothing
CAUTION: Set EA to 1 to enable interrupts
************************************************************************/
void rtc_init(void)
{
  // set reload value
  // count frequency = clock source / 128 / RTCH,RTCL
  RTCH = 0xfF;
  RTCL = 0xFF;

  // select CPU Clock, enable interrupt source
  RTCCON = 0x62;

  // initialize watchdog/real time clock interrupt
  watchdogrtc_isrinit();

  // start real time clock
  RTCCON |= 0x01;
}

/***********************************************************************
DESC:    Starts the Real Time Clock
RETURNS: Nothing
CAUTION: rtc_init must be called first
************************************************************************/
void rtc_start(void)
{
  // start the real time clock
  RTCCON |= 0x01;
}

/***********************************************************************
DESC:    Stops the Real Time Clock
RETURNS: Nothing
CAUTION: rtc_init must be called first
************************************************************************/
void rtc_stop(void)
{
  // stop the real time clock
  RTCCON &= ~0x01;
}