ds3231.h

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/* Support for DS3231 Real Time Clock

        DS3231 is an I2C device
        Requires I2C support, calls i2c.c
        This in turn requires a call of i2c_timerproc every 10mS to
        avoid failed I2C calls from blocking
        
        Make sure that TWI is initialised correctly before use. See note in i2c.c

*/

/* 15/12/2011  svn 479  */



/* Note that if using the alarm, you need to write values to the alarm
registers, then write the interrupt enable bits to the control register.
Once the interrupt occurs, you need to write to the status register to clear the interrupt.
Unsetting the bit in the control register is not enough 
*/

#ifndef DS3231_H
#define DS3231_H


#include <avr/io.h>
#include "config.h"
#include <util/delay.h>
#include <util/delay_basic.h>
#include "i2c.h"




void reset_rtc_i2c(void);



uint8_t read_from_rtc(uint8_t *store_data);



uint8_t write_to_rtc(uint8_t *store_data);



uint8_t write_alarm(uint8_t *alarm_data);



uint8_t read_temp_from_rtc(uint8_t *store_data);



uint8_t set_rtc_register_pointer(uint8_t val);



uint32_t get_fattime(void);



void dirname_from_date(uint8_t *dirname,uint8_t *time_store);



void filename_from_date(uint8_t *filename,uint8_t *time_store);



void iso_time(uint8_t *iso_time_store,uint8_t *time_store);



void americandate(uint8_t *result,uint8_t *time_store);



void hms_time(uint8_t *result,uint8_t *time_store);



uint8_t hex2ascii_h(uint8_t hexval);



uint8_t hex2ascii_l(uint8_t hexval);



uint8_t bcd_to_hex(uint8_t bcd);



uint8_t set_datetime(uint8_t *iso_time_store);



void addtime(uint8_t *result, uint8_t *start, uint16_t seconds);


#endif