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Ds1302 is a C/C++ library to use DS1302 RTC chip.
Copyright (C) 2017 Rafa Couto <caligari@treboda.net>
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# Ds1302
A C/C++ library to use DS1302 RTC chip.
Tested with (but easily portable to your favourite MCU):
- [X] Arduino
- [X] ESP32
- [X] ESP8266
Features:
- Simple to use and manage.
- Platformio compatible.
- Control of start/stop of the oscillator.
- Secure against edge time race conditions (see [#4][ISU02]).
## Examples
- [GetDateTime][EXA01]
- [SetDateTime][EXA02]
## License
This library is AGPL-3.0 licensed. See the [LICENSE][LIC01] file.
## Support
Bugs, feature requests, contributions are welcome: [Ds1302 issue tracker][ISU01].
[EXA01]: https://github.com/Treboada/Ds1302/tree/master/examples/01
[EXA02]: https://github.com/Treboada/Ds1302/tree/master/examples/02
[ISU01]: https://github.com/Treboada/Ds1302/issues
[ISU02]: https://github.com/Treboada/Ds1302/issues/4
[LIC01]: LICENSE
## Changelog
### 1.1.0
- Start and halt oscillator without setting current timestamp (thanks
[@photomultiplier](https://github.com/Treboada/Ds1302/pull/9))
### 1.0.5
- Bugfix: wrong mask when reading the year register (thanks
[@photomultiplier](https://github.com/Treboada/Ds1302/pull/8))
### 1.0.4
- Library added to the Arduino Library Manager (thanks
[@jackjansen](https://github.com/Treboada/Ds1302/issues/2))
### 1.0.3
- Bugfix: error on consecutive reads (thanks Reinhard Kopka).
### 1.0.2
- Bugfix: unable to set date 31, dow 7 and month 12.
- Platformio environment for ESP8266.
### 1.0.1
- First version.

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/** GetDateTime.cpp
*
* Example of getting the date and time from the RTC.
*
* @version 1.0.1
* @author Rafa Couto <caligari@treboada.net>
* @license GNU Affero General Public License v3.0
* @see https://github.com/Treboada/Ds1302
*
*/
#include <Arduino.h>
#include <Ds1302.h>
// DS1302 RTC instance
Ds1302 rtc(PIN_ENA, PIN_CLK, PIN_DAT);
const static char* WeekDays[] =
{
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
"Sunday"
};
void setup()
{
Serial.begin(9600);
// initialize the RTC
rtc.init();
// test if clock is halted and set a date-time (see example 2) to start it
if (rtc.isHalted())
{
Serial.println("RTC is halted. Setting time...");
Ds1302::DateTime dt = {
.year = 17,
.month = Ds1302::MONTH_OCT,
.day = 3,
.hour = 4,
.minute = 51,
.second = 30,
.dow = Ds1302::DOW_TUE
};
rtc.setDateTime(&dt);
}
}
void loop()
{
// get the current time
Ds1302::DateTime now;
rtc.getDateTime(&now);
static uint8_t last_second = 0;
if (last_second != now.second)
{
last_second = now.second;
Serial.print("20");
Serial.print(now.year); // 00-99
Serial.print('-');
if (now.month < 10) Serial.print('0');
Serial.print(now.month); // 01-12
Serial.print('-');
if (now.day < 10) Serial.print('0');
Serial.print(now.day); // 01-31
Serial.print(' ');
Serial.print(WeekDays[now.dow - 1]); // 1-7
Serial.print(' ');
if (now.hour < 10) Serial.print('0');
Serial.print(now.hour); // 00-23
Serial.print(':');
if (now.minute < 10) Serial.print('0');
Serial.print(now.minute); // 00-59
Serial.print(':');
if (now.second < 10) Serial.print('0');
Serial.print(now.second); // 00-59
Serial.println();
}
delay(100);
}

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; PlatformIO Project Configuration File
[platformio]
src_dir = .
lib_dir = ../..
[env:arduino]
platform = atmelavr
board = nanoatmega328
framework = arduino
build_flags =
-D PIN_ENA=2
-D PIN_DAT=3
-D PIN_CLK=4
[env:esp8266]
platform = espressif8266
board = d1_mini
framework = arduino
build_flags =
-D PIN_ENA=15
-D PIN_DAT=13
-D PIN_CLK=12
[env:esp32]
platform = espressif32
board = lolin32
framework = arduino
build_flags =
-D PIN_ENA=25
-D PIN_DAT=26
-D PIN_CLK=27

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/** SetDateTime.cpp
*
* Example of setting the date and time to the RTC.
*
* @version 1.0.1
* @author Rafa Couto <caligari@treboada.net>
* @license GNU Affero General Public License v3.0
* @see https://github.com/Treboada/Ds1302
*
*/
#include <Arduino.h>
#include <Ds1302.h>
// DS1302 RTC instance
Ds1302 rtc(PIN_ENA, PIN_CLK, PIN_DAT);
uint8_t parseDigits(char* str, uint8_t count)
{
uint8_t val = 0;
while(count-- > 0) val = (val * 10) + (*str++ - '0');
return val;
}
void setup()
{
// initialize the RTC
rtc.init();
Serial.begin(9600);
Serial.println("Input the date and time (YYMMDDWhhmmss): ");
}
void loop()
{
static char buffer[13];
static uint8_t char_idx = 0;
if (char_idx == 13)
{
// structure to manage date-time
Ds1302::DateTime dt;
dt.year = parseDigits(buffer, 2);
dt.month = parseDigits(buffer + 2, 2);
dt.day = parseDigits(buffer + 4, 2);
dt.dow = parseDigits(buffer + 6, 1);
dt.hour = parseDigits(buffer + 7, 2);
dt.minute = parseDigits(buffer + 9, 2);
dt.second = parseDigits(buffer + 11, 2);
// set the date and time
rtc.setDateTime(&dt);
char_idx = 0;
}
if (Serial.available())
{
buffer[char_idx++] = Serial.read();
}
}

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; PlatformIO Project Configuration File
[platformio]
src_dir = .
lib_dir = ../..
[env:arduino]
platform = atmelavr
board = nanoatmega328
framework = arduino
build_flags =
-D PIN_ENA=2
-D PIN_DAT=3
-D PIN_CLK=4
[env:esp8266]
platform = espressif8266
board = d1_mini
framework = arduino
build_flags =
-D PIN_ENA=15
-D PIN_DAT=13
-D PIN_CLK=12
[env:esp32]
platform = espressif32
board = lolin32
framework = arduino
build_flags =
-D PIN_ENA=25
-D PIN_DAT=26
-D PIN_CLK=27

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{
"name": "Ds1302",
"version": "1.1.0",
"keywords": "library, C, C++, RTC, DS1302, clock, date, time, datetime",
"description": "A C/C++ library to use DS1302 RTC chip.",
"license": "AGPL-3.0",
"homepage": "https://github.com/Treboada/Ds1302",
"frameworks": "arduino",
"platforms": [
"atmelavr",
"espressif8266",
"espressif32"
],
"examples": [
{
"name": "GetDateTime",
"base": "examples/01",
"files": [
"GetDateTime.cpp"
]
},
{
"name": "SetDateTime",
"base": "examples/02",
"files": [
"SetDateTime.cpp"
]
}
],
"repository": {
"type": "git",
"url": "https://github.com/Treboada/Ds1302.git"
},
"authors": {
"name": "Rafa Couto",
"email": "caligari@treboada.net",
"url": "http://www.linkedin.com/in/rafacouto"
}
}

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libraries/Ds1302/library.properties Normal file
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name=Ds1302
version=1.1.0
author=Rafa Couto <caligari@treboada.net>
maintainer=Rafa Couto <caligari@treboada.net>
sentence=A C/C++ library to use DS1302 RTC chip.
paragraph=A C/C++ library to use DS1302 RTC chip.
category=Device Control
url=https://github.com/Treboada/Ds1302
architectures=avr,esp8266,esp32

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/** Ds1302.cpp
*
* Ds1302 class.
*
* @version 1.0.3
* @author Rafa Couto <caligari@treboada.net>
* @license GNU Affero General Public License v3.0
* @see https://github.com/Treboada/Ds1302
*
*/
#include "Ds1302.h"
#include <Arduino.h>
#define REG_SECONDS 0x80
#define REG_MINUTES 0x82
#define REG_HOUR 0x84
#define REG_DATE 0x86
#define REG_MONTH 0x88
#define REG_DAY 0x8A
#define REG_YEAR 0x8C
#define REG_WP 0x8E
#define REG_BURST 0xBE
Ds1302::Ds1302(uint8_t pin_ena, uint8_t pin_clk, uint8_t pin_dat)
{
_pin_ena = pin_ena;
_pin_clk = pin_clk;
_pin_dat = pin_dat;
_dat_direction = INPUT;
}
void Ds1302::init()
{
pinMode(_pin_ena, OUTPUT);
pinMode(_pin_clk, OUTPUT);
pinMode(_pin_dat, _dat_direction);
digitalWrite(_pin_ena, LOW);
digitalWrite(_pin_clk, LOW);
}
bool Ds1302::isHalted()
{
_prepareRead(REG_SECONDS);
uint8_t seconds = _readByte();
_end();
return (seconds & 0b10000000);
}
void Ds1302::getDateTime(DateTime* dt)
{
_prepareRead(REG_BURST);
dt->second = _bcd2dec(_readByte() & 0b01111111);
dt->minute = _bcd2dec(_readByte() & 0b01111111);
dt->hour = _bcd2dec(_readByte() & 0b00111111);
dt->day = _bcd2dec(_readByte() & 0b00111111);
dt->month = _bcd2dec(_readByte() & 0b00011111);
dt->dow = _bcd2dec(_readByte() & 0b00000111);
dt->year = _bcd2dec(_readByte() & 0b11111111);
_end();
}
void Ds1302::setDateTime(DateTime* dt)
{
_prepareWrite(REG_WP);
_writeByte(0b00000000);
_end();
_prepareWrite(REG_BURST);
_writeByte(_dec2bcd(dt->second % 60 ));
_writeByte(_dec2bcd(dt->minute % 60 ));
_writeByte(_dec2bcd(dt->hour % 24 ));
_writeByte(_dec2bcd(dt->day % 32 ));
_writeByte(_dec2bcd(dt->month % 13 ));
_writeByte(_dec2bcd(dt->dow % 8 ));
_writeByte(_dec2bcd(dt->year % 100));
_writeByte(0b10000000);
_end();
}
void Ds1302::halt()
{
_setHaltFlag(true);
}
void Ds1302::start()
{
_setHaltFlag(false);
}
void Ds1302::_setHaltFlag(bool stopped)
{
uint8_t regs[8];
_prepareRead(REG_BURST);
for (int b = 0; b < 8; b++) regs[b] = _readByte();
_end();
if (stopped) regs[0] |= 0b10000000; else regs[0] &= ~0b10000000;
regs[7] = 0b10000000;
_prepareWrite(REG_WP);
_writeByte(0b00000000);
_end();
_prepareWrite(REG_BURST);
for (int b = 0; b < 8; b++) _writeByte(regs[b]);
_end();
}
void Ds1302::_prepareRead(uint8_t address)
{
_setDirection(OUTPUT);
digitalWrite(_pin_ena, HIGH);
uint8_t command = 0b10000001 | address;
_writeByte(command);
_setDirection(INPUT);
}
void Ds1302::_prepareWrite(uint8_t address)
{
_setDirection(OUTPUT);
digitalWrite(_pin_ena, HIGH);
uint8_t command = 0b10000000 | address;
_writeByte(command);
}
void Ds1302::_end()
{
digitalWrite(_pin_ena, LOW);
}
uint8_t Ds1302::_readByte()
{
uint8_t byte = 0;
for(uint8_t b = 0; b < 8; b++)
{
if (digitalRead(_pin_dat) == HIGH) byte |= 0x01 << b;
_nextBit();
}
return byte;
}
void Ds1302::_writeByte(uint8_t value)
{
for(uint8_t b = 0; b < 8; b++)
{
digitalWrite(_pin_dat, (value & 0x01) ? HIGH : LOW);
_nextBit();
value >>= 1;
}
}
void Ds1302::_nextBit()
{
digitalWrite(_pin_clk, HIGH);
delayMicroseconds(1);
digitalWrite(_pin_clk, LOW);
delayMicroseconds(1);
}
void Ds1302::_setDirection(int direction)
{
if (_dat_direction != direction)
{
_dat_direction = direction;
pinMode(_pin_dat, direction);
}
}
uint8_t Ds1302::_dec2bcd(uint8_t dec)
{
return ((dec / 10 * 16) + (dec % 10));
}
uint8_t Ds1302::_bcd2dec(uint8_t bcd)
{
return ((bcd / 16 * 10) + (bcd % 16));
}

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/** Ds1302.h
*
* Ds1302 class.
*
* @version 1.0.3
* @author Rafa Couto <caligari@treboada.net>
* @license GNU Affero General Public License v3.0
* @see https://github.com/Treboada/Ds1302
*
*/
#ifndef _DS_1302_H
#define _DS_1302_H
#include <stdint.h>
class Ds1302
{
public:
typedef struct {
uint8_t year;
uint8_t month;
uint8_t day;
uint8_t hour;
uint8_t minute;
uint8_t second;
uint8_t dow;
} DateTime;
/**
* Months of year
*/
enum MONTH : uint8_t {
MONTH_JAN = 1,
MONTH_FEB = 2,
MONTH_MAR = 3,
MONTH_APR = 4,
MONTH_MAY = 5,
MONTH_JUN = 6,
MONTH_JUL = 7,
MONTH_AUG = 8,
MONTH_SEP = 9,
MONTH_OCT = 10,
MONTH_NOV = 11,
MONTH_DEC = 12
};
/**
* Days of week
*/
enum DOW : uint8_t {
DOW_MON = 1,
DOW_TUE = 2,
DOW_WED = 3,
DOW_THU = 4,
DOW_FRI = 5,
DOW_SAT = 6,
DOW_SUN = 7
};
/**
* Constructor (pin configuration).
*/
Ds1302(uint8_t pin_ena, uint8_t pin_clk, uint8_t pin_dat);
/**
* Initializes the DW1302 chip.
*/
void init();
/**
* Returns when the oscillator is disabled.
*/
bool isHalted();
/**
* Stops the oscillator.
*/
void halt();
/**
* Starts the oscillator.
*/
void start();
/**
* Returns the current date and time.
*/
void getDateTime(DateTime* dt);;
/**
* Sets the current date and time.
*/
void setDateTime(DateTime* dt);
private:
uint8_t _pin_ena;
uint8_t _pin_clk;
uint8_t _pin_dat;
void _prepareRead(uint8_t address);
void _prepareWrite(uint8_t address);
void _end();
int _dat_direction;
void _setDirection(int direction);
uint8_t _readByte();
void _writeByte(uint8_t value);
void _nextBit();
uint8_t _dec2bcd(uint8_t dec);
uint8_t _bcd2dec(uint8_t bcd);
void _setHaltFlag(bool stopped);
};
#endif // _DS_1302_H