ds1307_internal.h File Reference

Register definitions for DS1307 RTC. More...

Detailed Description

Register definitions for DS1307 RTC.

Author

Martine Lenders m.len.nosp@m.ders.nosp@m.@fu-b.nosp@m.erli.nosp@m.n.de

Definition in file ds1307_internal.h.

Go to the source code of this file.

Registers
#define	DS1307_REG_SEC   (0x00)
	seconds
#define	DS1307_REG_MIN   (0x01)
	minutes
#define	DS1307_REG_HOUR   (0x02)
	hours
#define	DS1307_REG_DOW   (0x03)
	day of week (1-7, 1 == sunday)
#define	DS1307_REG_DOM   (0x04)
	day of month
#define	DS1307_REG_MON   (0x05)
	month
#define	DS1307_REG_YEAR   (0x06)
	year
#define	DS1307_REG_SQW_CTL   (0x07)
	SQW control.
#define	DS1307_REG_RAM_FIRST   (0x08)
	NVRAM start.
#define	DS1307_REG_RAM_LAST   (0x3F)
	NVRAM end.

Register bits
#define	DS1307_REG_SEC_CH   (0x80)
	clock halt bit
#define	DS1307_REG_SEC_MASK   (0x7f)
	seconds mask
#define	DS1307_REG_MIN_MASK   (0x7f)
	minutes mask
#define	DS1307_REG_HOUR_12H   (0x40)
	12-hour (0) / 24-hour (1) mode
#define	DS1307_REG_HOUR_PM   (0x20)
	AM (0) / PM (1) in 12-hour mode.
#define	DS1307_REG_HOUR_12H_MASK   (0x2f)
	hour (12-hour mode)
#define	DS1307_REG_HOUR_24H_MASK   (0x3f)
	hour (24-hour mode)
#define	DS1307_REG_DOW_MASK   (0x07)
	day of week mask
#define	DS1307_REG_DOM_MASK   (0x3f)
	day of month mask
#define	DS1307_REG_MON_MASK   (0x1f)
	month mask

Custom offsets (to DS1307 registers to struct tm)
#define	DS1307_DOW_OFFSET   (1)
	offset in days from sunday
#define	DS1307_MON_OFFSET   (1)
	offset in month from January
#define	DS1307_YEAR_OFFSET   (-100)
	offset in years from 1900