/**************************************************************************//**
* \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/bits.h>
#include <useful/datetime.h>
#include <avr/io.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
/******************************************************************************
* Private macros.
******************************************************************************/
#define DS1307__ADDRESS 0xD0
#define DS1307__REG_SECONDS 0x00
#define DS1307__REG_MINUTES 0x01
#define DS1307__REG_HOURS 0x02
#define DS1307__REG_DAY 0x03
#define DS1307__REG_DATE 0x04
#define DS1307__REG_MONTH 0x05
#define DS1307__REG_YEAR 0x06
#define DS1307__REG_CONTROL 0x07
#define DS1307__RS0 0x00
#define DS1307__RS1 0x01
#define DS1307__SQWE 0x04
#define DS1307__OUT 0x07
/**************************************************************************//**
* \def DS1307__REG_RAM
* \brief Start address of RAM registers (locations 0x08 to 0x3F).
******************************************************************************/
#define DS1307__REG_RAM 0x08
/******************************************************************************
* 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__REG_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__REG_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__REG_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__REG_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
();
}
/**************************************************************************//**
* \fn void ds1307__set_square_wave_output_level(ds1307__sqw_out_level_t level)
*
* \brief Set square wave output pin level.
*
* \param level Level to set.
******************************************************************************/
void
ds1307__set_square_wave_output_level
(
ds1307__sqw_out_level_t level
){
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REG_CONTROL
);
uint8_t register_value
= (level
== DS1307__SQW_LEVEL__LOW
) ? 0x00 : 0x80;
twi__send_data
(register_value
);
twi__stop
();
}
/**************************************************************************//**
* \fn void ds1307__set_square_wave_output_signal(
* ds1307__sqw_out__frequency_t frequency,
* bool enable)
*
* \brief Set Square-Wave output signal.
*
* \param frequency Frequency.
* \param enable Status.
******************************************************************************/
void
ds1307__set_square_wave_output_signal
(
ds1307__sqw_out__frequency_t frequency
,
bool enable
){
uint8_t register_value
= 0;
// Rate select.
switch (frequency
)
{
case DS1307__SQW_FREQUENCY__4096_HZ
:
register_value
= _BV
(DS1307__RS0
);
break;
case DS1307__SQW_FREQUENCY__8192_HZ
:
register_value
= _BV
(DS1307__RS1
);
break;
case DS1307__SQW_FREQUENCY__32768_HZ
:
register_value
= _BV
(DS1307__RS1
) | _BV
(DS1307__RS0
);
break;
case DS1307__SQW_FREQUENCY__1_HZ
:
default:
register_value
= 0;
break;
}
// Square-Wave enable.
if (enable
)
{
BIT__SET
(register_value
, DS1307__SQWE
);
}
twi__start
();
twi__send_slaw
(DS1307__ADDRESS
);
twi__send_data
(DS1307__REG_CONTROL
);
twi__send_data
(register_value
);
twi__stop
();
}