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132 lines
3.5 KiB
C
Executable File
132 lines
3.5 KiB
C
Executable File
/*! \file rtc.c \brief Real-time clock function library. */
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//*****************************************************************************
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//
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// File Name : 'rtc.c'
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// Title : Real-time clock function library
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// Author : Pascal Stang - Copyright (C) 2002
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// Created : 5/10/2002
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// Revised : 9/30/2002
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// Version : 0.6
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// Target MCU : Atmel AVR Series
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// Editor Tabs : 4
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//
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// NOTE: This code is currently below version 1.0, and therefore is considered
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// to be lacking in some functionality or documentation, or may not be fully
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// tested. Nonetheless, you can expect most functions to work.
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#ifndef WIN32
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#include <avr/io.h>
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#include <avr/signal.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#endif
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#include "global.h"
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// include timer support
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#ifdef __AVR_ATmega128__
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#include "timer128.h"
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#else
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#include "timer.h"
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#endif
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// include rtc header
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#include "rtc.h"
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// Program ROM constants
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static char __attribute__ ((progmem)) MonthDayTable[] = {31,28,31,30,31,30,31,31,30,31,30,31};
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// Global variables
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// time registers
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RtcTimeType RtcTime;
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void rtcInit(void)
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{
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// set up timer for RTC operation
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// initialize real-time registers
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RtcTime.totaltics = 0;
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RtcTime.tics = 0;
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RtcTime.seconds = 0;
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RtcTime.minutes = 0;
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RtcTime.hours = 0;
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RtcTime.day = 1;
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RtcTime.month = 1;
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RtcTime.year = 2000;
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// select the correct RTC timer based on bit defines
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#ifdef AS2
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// use timer2 for most AVRs
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// initialize timer 2
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timer2Init();
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// count with 32.768KHz/8
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timer2SetPrescaler(TIMER_CLK_DIV8);
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// switch to asynchronous input (32KHz crystal)
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sbi(ASSR, AS2);
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// attach service to real-time clock interrupt
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// rtcService() will be called at ((32768/8)/256) = 16Hz
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timerAttach(TIMER2OVERFLOW_INT, rtcService);
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#else
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#ifdef AS0
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// use timer0 for ATmega103, ATmega128
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// initialize timer 0
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timer0Init();
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// count with 32.768KHz/8
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timer0SetPrescaler(TIMER_CLK_DIV8);
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// switch to asynchronous input (32KHz crystal)
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sbi(ASSR, AS0);
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// attach service to real-time clock interrupt
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// rtcService() will be called at ((32768/8)/256) = 16Hz
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timerAttach(TIMER0OVERFLOW_INT, rtcService);
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#endif
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#endif
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}
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void rtcService(void)
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{
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// update real-time clock registers
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RtcTime.totaltics++;
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RtcTime.tics++;
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// check for overflows
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if(RtcTime.tics == 16) // tics
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{
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RtcTime.tics = 0;
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RtcTime.seconds++; // increment seconds
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if(RtcTime.seconds > 59) // check seconds overflow
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{
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RtcTime.seconds -= 60;
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RtcTime.minutes++; // increment minutes
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if(RtcTime.minutes > 59) // check minutes overflow
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{
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RtcTime.minutes -= 60;
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RtcTime.hours++; // increment hours
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if(RtcTime.hours > 23) // check hours overflow
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{
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RtcTime.hours -= 24;
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RtcTime.day++; // increment days
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// check days overflow
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if(RtcTime.day == pgm_read_byte(&MonthDayTable[RtcTime.month-1]))
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{
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RtcTime.day = 1;
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RtcTime.month++; // increment months
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if(RtcTime.month == 13) // check months overflow
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{
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RtcTime.month = 1;
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RtcTime.year++; // increment years
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}
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}
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}
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}
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}
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}
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}
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RtcTimeType* rtcGetTime(void)
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{
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// return the real-time clock data
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return &RtcTime;
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}
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