rtc.h File Reference

#include <core/io.h>
#include <system.h>

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Macros
#define	RTC_INDEX_REG   0x70
#define	RTC_DATA_REG   0x71
#define	SECONDS_INDEX   0x00
#define	MINUTES_INDEX   0x02
#define	HOURS_INDEX   0x04
#define	DAY_OF_MONTH_INDEX   0x07
#define	MONTHS_INDEX   0x08
#define	YEAR_INDEX   0x09

Functions
void	get_time (int *hours, int *minutes, int *seconds)
	get_time this function will retrieve the system time and place it in three pointers. Military time More...
void	set_time (int hours, int minutes, int seconds)
	set_time sets the RTC time. Military time More...
void	get_date (int *day, int *month, int *year)
	get_date this function will retrieve the system date and place in three pointers More...
void	set_date (int day, int month, int year)
	set_date sets the RTC Date More...

Macro Definition Documentation

#define DAY_OF_MONTH_INDEX   0x07

Definition at line 13 of file rtc.h.

Referenced by get_date(), and set_date().

#define HOURS_INDEX   0x04

Definition at line 12 of file rtc.h.

Referenced by get_time(), and set_time().

#define MINUTES_INDEX   0x02

Definition at line 11 of file rtc.h.

Referenced by get_time(), and set_time().

#define MONTHS_INDEX   0x08

Definition at line 14 of file rtc.h.

Referenced by get_date(), and set_date().

#define RTC_DATA_REG   0x71

Definition at line 8 of file rtc.h.

Referenced by set_date(), and set_time().

#define RTC_INDEX_REG   0x70

Definition at line 7 of file rtc.h.

Referenced by get_date(), get_time(), set_date(), and set_time().

#define SECONDS_INDEX   0x00

Definition at line 10 of file rtc.h.

Referenced by get_time(), and set_time().

#define YEAR_INDEX   0x09

Definition at line 15 of file rtc.h.

Referenced by get_date(), and set_date().

Function Documentation

void get_date	(	int *	day,
		int *	month,
		int *	year
	)

get_date this function will retrieve the system date and place in three pointers

Parameters

day	pointer to int where the current day will be stored, UTC Time zone
months	pointer to int where the current month will be stored, UTC Time zone
year	pointer to int where the current year will be stored, UTC Time zone

Definition at line 56 of file rtc.c.

References DAY_OF_MONTH_INDEX, inb, MONTHS_INDEX, outb, RTC_INDEX_REG, and YEAR_INDEX.

Referenced by getDate().

{
    char temp = 0;
    outb(RTC_INDEX_REG, DAY_OF_MONTH_INDEX);
    temp = inb(0x71);
    *day = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, MONTHS_INDEX);
    temp = inb(0x71);
    *month = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, YEAR_INDEX);
    temp = inb(0x71);
    *year = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);
}

void get_time	(	int *	hours,
		int *	minutes,
		int *	seconds
	)

get_time this function will retrieve the system time and place it in three pointers. Military time

Parameters

hours	pointer to int where the current hours will be stored, in UTC timezone
minutes	pointer to int where the current minutes will be stored, in UTC timezone
seconds	pointer to int where the current seconds will be stored, in UTC timezone

get_time this function will retrieve the system time and place it in three pointers. Military time

Parameters

hours	pointer to int where the current hours will be stored, in UTC timezone
minutes	pointer to int where the current minutes will be stored, in UTC timezone
seconds	pointer to int where the current seconds will be stored, in UTC timezone

Definition at line 10 of file rtc.c.

References HOURS_INDEX, inb, MINUTES_INDEX, outb, RTC_INDEX_REG, and SECONDS_INDEX.

Referenced by getTime().

{
    char temp = 0;
    outb(RTC_INDEX_REG, SECONDS_INDEX);
    temp = inb(0x71);
    *seconds = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, MINUTES_INDEX);
    temp = inb(0x71);
    *minutes = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);

    outb(RTC_INDEX_REG, HOURS_INDEX);
    temp = inb(0x71);
    *hours = ((temp & 0xf0) >>4 ) *10 + (temp & 0x0f);
}

void set_date	(	int	day,
		int	month,
		int	year
	)

set_date sets the RTC Date

Parameters

day	the day to set the clock to, must be valid for the month. UTC Time zone
month	the month to set the clock to, must be between 1 and 12. UTC Time zone
year	the year to set the clock to, must be less than 100. UTC Time zone

Definition at line 79 of file rtc.c.

References cli, DAY_OF_MONTH_INDEX, MONTHS_INDEX, outb, RTC_DATA_REG, RTC_INDEX_REG, sti, and YEAR_INDEX.

Referenced by setDate().

{
    sti();

    outb(RTC_INDEX_REG, DAY_OF_MONTH_INDEX);
    outb(RTC_DATA_REG, ((day/10)<<4)|(day%10));

    outb(RTC_INDEX_REG, MONTHS_INDEX);
    outb(RTC_DATA_REG, ((month/10)<<4)|(month%10));

    outb(RTC_INDEX_REG, YEAR_INDEX);
    outb(RTC_DATA_REG, (((year-(year/100)*100)/10)<<4)|(year%10) );

    cli();
}

void set_time	(	int	hours,
		int	minutes,
		int	seconds
	)

set_time sets the RTC time. Military time

Parameters

hours	the hours to set the clock to, must be less than 24. In UTC Time zone
minutes	the minutes to set the clock to, must be less than 60. In UTC Time zone
seconds	the seconds to set the clock to, must be less than 60. In UTC Time zone

set_time sets the RTC time. Military time

Parameters

hours	the hours to set the clock to, must be less than 24. In UTC Time zone
minutes	the minutes to set the clock to, must be less than 60. In UTC Time zone
seconds	the seconds to set the clock to, must be less than 60. In UTC Time zone

Definition at line 33 of file rtc.c.

References cli, HOURS_INDEX, MINUTES_INDEX, outb, RTC_DATA_REG, RTC_INDEX_REG, SECONDS_INDEX, and sti.

Referenced by setTime().

{
    sti();

    outb(RTC_INDEX_REG, HOURS_INDEX);
    outb(RTC_DATA_REG, ((hours/10)<<4)|(hours%10) );

    outb(RTC_INDEX_REG, MINUTES_INDEX);
    outb(RTC_DATA_REG, ((minutes/10)<<4)|(minutes%10) );

    outb(RTC_INDEX_REG, SECONDS_INDEX);
    outb(RTC_DATA_REG, ((seconds/10)<<4)|(seconds%10) );

    cli();
}