/**************************************************************************//**
* \brief DS1307 RTC library
* \author Copyright (C) 2009 Julien Le Sech - www.idreammicro.com
* \version 1.0
* \date 20090501
*
* This file is part of the iDreamMicro library.
*
* This library is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see http://www.gnu.org/licenses/
******************************************************************************/
/**************************************************************************//**
* \file ds1307.c
******************************************************************************/
/******************************************************************************
* Header file inclusions.
******************************************************************************/
#include <ds1307/ds1307.h>
#include <twi/twi.h>
#include <useful/datetime.h>
#include <assert.h>
#include <stdlib.h>
/******************************************************************************
* Private macros.
******************************************************************************/
#define DS1307__ADDRESS 0xD0
#define DS1307__REGISTER_ADDRESS__SECONDS 0x00
#define DS1307__REGISTER_ADDRESS__MINUTES 0x01
#define DS1307__REGISTER_ADDRESS__HOURS 0x02
#define DS1307__REGISTER_ADDRESS__DAY 0x03
#define DS1307__REGISTER_ADDRESS__DATE 0x04
#define DS1307__REGISTER_ADDRESS__MONTH 0x05
#define DS1307__REGISTER_ADDRESS__YEAR 0x06
#define DS1307__REGISTER_ADDRESS__CONTROL 0x07
/******************************************************************************
* Public function definitions.
******************************************************************************/
/**************************************************************************//**
* \fn void ds1307__initialize(void)
*
* \brief Initialize RTC.
******************************************************************************/
void
ds1307__initialize
(
void
){
// We don't initialize TWI here: we may have several devices on the bus.
// Initialize TWI.
//twi__initialize(DS1307__CLOCK_RATE);
}
/**************************************************************************//**
* \fn void ds1307__get_time(
* date_time__time_t* p_time,
* ds1307__hour_mode_t* p_hour_mode)
*
* \brief Get RTC time.
*
* \param p_time a pointer to fill with RTC time
* \param p_hour_mode a pointer to fill with RTC hour mode
******************************************************************************/
void
ds1307__get_time
(
datetime__time_t
* p_time
,
ds1307__hour_mode_t
* p_hour_mode
){
// Check the preconditions.
assert(NULL
!= p_time
);
assert(NULL
!= p_hour_mode
);
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REGISTER_ADDRESS__SECONDS
);
twi__stop
();
twi__start
();
twi__send_slar
(DS1307__ADDRESS
);
uint8_t seconds
= 0;
twi__receive_data_ack
(&seconds
);
uint8_t minutes
= 0;
twi__receive_data_ack
(&minutes
);
uint8_t hours
= 0;
twi__receive_data_nack
(&hours
);
p_time
->seconds
= (((seconds
& 0x70) >> 4) * 10) + (seconds
& 0x0F);
p_time
->minutes
= (((minutes
& 0x70) >> 4) * 10) + (minutes
& 0x0F);
*p_hour_mode
= (ds1307__hour_mode_t
)((hours
& 0x40) >> 6);
if (DS1307__HOUR_MODE__12_HOUR
== *p_hour_mode
)
{
p_time
->meridiem
= (datetime__meridiem_t
)((hours
& 0x20) >> 5);
p_time
->hours
= (((hours
& 0x10) >> 4) * 10) + (hours
& 0x0F);
}
else
{
p_time
->hours
= (((hours
& 0x30) >> 4) * 10) + (hours
& 0x0F);
}
twi__stop
();
}
/**************************************************************************//**
* \fn void ds1307__set_time(
* date_time__time_t* p_time,
* ds1307__hour_mode_t hour_mode)
*
* \brief Set RTC time.
*
* \param p_time time to set. p_time->meridiem isn't used in 12-hour mode.
* \param hour_mode hour mode
******************************************************************************/
void
ds1307__set_time
(
datetime__time_t
* p_time
,
ds1307__hour_mode_t hour_mode
){
// Check the preconditions.
assert(NULL
!= p_time
);
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REGISTER_ADDRESS__SECONDS
);
uint8_t seconds
= ((p_time
->seconds
/ 10) << 4) + (p_time
->seconds
% 10);
uint8_t minutes
= ((p_time
->minutes
/ 10) << 4) + (p_time
->minutes
% 10);
uint8_t hours
= 0;
if (DS1307__HOUR_MODE__12_HOUR
== hour_mode
)
{
hours
= (hour_mode
<< 6) + (p_time
->meridiem
<< 5)
+ ((p_time
->hours
/ 10) << 4) + (p_time
->hours
% 10);
}
else
{
hours
= (hour_mode
<< 6) + ((p_time
->hours
/ 10) << 4)
+ (p_time
->hours
% 10);
}
twi__send_data
(seconds
);
twi__send_data
(minutes
);
twi__send_data
(hours
);
twi__stop
();
}
/**************************************************************************//**
* \fn void ds1307__get_date(date_time__date_t* p_date)
*
* \brief Get RTC date.
*
* \param p_date a pointer to fill with RTC date
******************************************************************************/
void
ds1307__get_date
(
datetime__date_t
* p_date
){
// Check the preconditions.
assert(NULL
!= p_date
);
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REGISTER_ADDRESS__DAY
);
twi__stop
();
twi__start
();
twi__send_slar
(DS1307__ADDRESS
);
uint8_t day
= 0;
twi__receive_data_ack
(&day
);
uint8_t date
= 0;
twi__receive_data_ack
(&date
);
uint8_t month
= 0;
twi__receive_data_ack
(&month
);
uint8_t year
= 0;
twi__receive_data_nack
(&year
);
p_date
->day
= day
;
p_date
->date
= (((date
& 0x30) >> 4) * 10) + (date
& 0x0F);
p_date
->month
= (((month
& 0x10) >> 4) * 10) + (month
& 0x0F);
p_date
->year
= (((year
& 0xF0) >> 4) * 10) + (year
& 0x0F);
twi__stop
();
}
/**************************************************************************//**
* \fn void ds1307__set_date(date_time__date_t* p_date)
*
* \brief Set RTC date.
*
* \param p_date date to set
******************************************************************************/
void
ds1307__set_date
(
datetime__date_t
* p_date
){
// Check the preconditions.
assert(NULL
!= p_date
);
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REGISTER_ADDRESS__DAY
);
uint8_t date
= ((p_date
->date
/ 10) << 4) + (p_date
->date
% 10);
uint8_t month
= ((p_date
->month
/ 10) << 4) + (p_date
->month
% 10);
uint8_t year
= ((p_date
->year
/ 10) << 4) + (p_date
->year
% 10);
twi__send_data
(p_date
->day
);
twi__send_data
(date
);
twi__send_data
(month
);
twi__send_data
(year
);
twi__stop
();
}