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time.h File Reference

Real time clock driver header. More...

Go to the source code of this file.

Defines
#define	RTC_EPOCH_YEAR   1970
	The base epoch year.
#define	EPOCH_DAY   0
	The base epoch day (Jan 1).
#define	RTC_SECONDS   0
	RTC port for seconds.
#define	RTC_MINUTES   2
	RTC port for minutes.
#define	RTC_HOURS   4
	RTC port for hours.
#define	RTC_DAY_OF_WEEK   6
	RTC port for the day of the week.
#define	RTC_DAY_OF_MONTH   7
	RTC port for the month.
#define	RTC_MONTH   8
	RTC port for month.
#define	RTC_YEAR   9
	RTC port for year.
#define	RTC_REG_A   10
	RTC control register A.
#define	RTC_REG_B   11
	RTC control register B.
#define	RTC_REG_C   12
	RTC control register C.
#define	RTC_REG_D   13
	RTC control register D.
#define	BCD2BIN(n)   ( ((n) >> 4) * 10 + ((n) & 0x0F) )
	Macro to convert from BCD to binary format.
#define	BIN2BCD(n)   ( (((n) / 10) << 4) + ((n) % 10) )
	Macro to convert from binary to BCD format.
#define	CMOS_CTRL   0x70
	CMOS control register.
#define	CMOS_DATA   0x71
	CMOS data register.
#define	CMOS_READ(port)
	Read a value from the CMOS. Parameters: port  The port to read from. Returns: The value read from the CMOS port.
#define	CMOS_WRITE(port, val)
	Write a value to the CMOS. Parameters: port  The port to write to. val  The value to write.
#define	RTC_FREQ_SELECT   RTC_REG_A
	RTC update frequency register.
#define	RTC_UIP   0x80
	Update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, totalling to a max high interval of 2.228 ms.
#define	RTC_DIV_RESET1   0x60
#define	RTC_DIV_RESET2   0x70
#define	RTC_CONTROL   RTC_REG_B
	RTC status register.
#define	RTC_SET   0x80
	Disable updates for clock setting.
#define	RTC_DM_BINARY   0x04
	RTC binary date; all time/date values are BCD if clear.
#define	RTC_24H   0x02
Typedefs
typedef unsigned long	time_t
	Time variable type.
Functions
__inline__ unsigned long	mktime (unsigned int year, unsigned int mon, unsigned int day, unsigned int hour, unsigned int min, unsigned int sec)
	Converts Gregorian date to seconds since 1970-01-01 00:00:00. Parameters: year  The year value. mon  The month value. day  The day of the month value. hour  The hours value. min  The minutes value. sec  The seconds value. Returns: Seconds since 1970-01-01 00:00:00 (UNIX timestamp).
void	time_init ()
	Initialize the Real-Time Clock.
time_t	time_read ()
	Get the seconds passed since midnight 1970-01-01 (Unix timestamp). Returns: The UNIX timestamp.

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Detailed Description

Real time clock driver header.

Author:

Andrea Righi <drizzt@inwind.it>

Date:

Last update: 2003-08-27

Note:

Copyright (©) 2003 Andrea Righi

Definition in file time.h.

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Define Documentation

#define BCD2BIN (  n    )     ( ((n) >> 4) * 10 + ((n) & 0x0F) )

Macro to convert from BCD to binary format. Definition at line 45 of file time.h.

#define BIN2BCD (  n    )     ( (((n) / 10) << 4) + ((n) % 10) )

Macro to convert from binary to BCD format. Definition at line 47 of file time.h.

#define CMOS_CTRL   0x70

CMOS control register. Definition at line 50 of file time.h.

#define CMOS_DATA   0x71

CMOS data register. Definition at line 52 of file time.h.

#define CMOS_READ (  port    )

Value: ( \ { \ out( CMOS_CTRL, (port) ); \ in( CMOS_DATA ); \ }) Read a value from the CMOS. Parameters: port  The port to read from. Returns: The value read from the CMOS port. Definition at line 57 of file time.h.

#define CMOS_WRITE (  port, val    )

Value: ( \ { \ out( CMOS_CTRL, (port) ); \ out( CMOS_DATA, (val) ); \ }) Write a value to the CMOS. Parameters: port  The port to write to. val  The value to write. Definition at line 66 of file time.h.

#define EPOCH_DAY   0

The base epoch day (Jan 1). Definition at line 17 of file time.h.

#define RTC_24H   0x02

Definition at line 94 of file time.h.

#define RTC_CONTROL   RTC_REG_B

RTC status register. Definition at line 87 of file time.h.

#define RTC_DAY_OF_MONTH   7

RTC port for the month. Definition at line 29 of file time.h.

#define RTC_DAY_OF_WEEK   6

RTC port for the day of the week. Definition at line 27 of file time.h.

#define RTC_DIV_RESET1   0x60

Definition at line 82 of file time.h.

#define RTC_DIV_RESET2   0x70

Definition at line 83 of file time.h.

#define RTC_DM_BINARY   0x04

RTC binary date; all time/date values are BCD if clear. Definition at line 92 of file time.h.

#define RTC_EPOCH_YEAR   1970

The base epoch year. Definition at line 15 of file time.h.

#define RTC_FREQ_SELECT   RTC_REG_A

RTC update frequency register. Definition at line 75 of file time.h.

#define RTC_HOURS   4

RTC port for hours. Definition at line 24 of file time.h.

#define RTC_MINUTES   2

RTC port for minutes. Definition at line 22 of file time.h.

#define RTC_MONTH   8

RTC port for month. Definition at line 31 of file time.h.

#define RTC_REG_A   10

RTC control register A. Definition at line 36 of file time.h.

#define RTC_REG_B   11

RTC control register B. Definition at line 38 of file time.h.

#define RTC_REG_C   12

RTC control register C. Definition at line 40 of file time.h.

#define RTC_REG_D   13

RTC control register D. Definition at line 42 of file time.h.

#define RTC_SECONDS   0

RTC port for seconds. Definition at line 20 of file time.h.

#define RTC_SET   0x80

Disable updates for clock setting. Definition at line 90 of file time.h.

#define RTC_UIP   0x80

Update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, totalling to a max high interval of 2.228 ms. Definition at line 80 of file time.h.

#define RTC_YEAR   9

RTC port for year. Definition at line 33 of file time.h.

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Typedef Documentation

typedef unsigned long time_t

Time variable type. Definition at line 12 of file time.h.

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