ds1307.hpp

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2014 Intel Corporation.
 *
 * Adapted from Seeed Studio library:
 * https://github.com/Seeed-Studio/RTC_DS1307
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#pragma once

#include <string>
#include <mraa/i2c.hpp>

#define DS1307_I2C_BUS     0
#define DS1307_I2C_ADDR    0x68

// Days of the week
#define DS1307_DAY_MON 1
#define DS1307_DAY_TUE 2
#define DS1307_DAY_WED 3
#define DS1307_DAY_THU 4
#define DS1307_DAY_FRI 5
#define DS1307_DAY_SAT 6
#define DS1307_DAY_SUN 7

namespace upm {
  class DS1307 {
  public:
    DS1307(int bus);

    bool loadTime();

    bool setTime();

    mraa::Result enableClock();

    mraa::Result disableClock();

    mraa::Result writeBytes(uint8_t reg, uint8_t *buffer, int len);

    int readBytes(uint8_t reg, uint8_t *buffer, int len);

    unsigned int bcdToDec(uint8_t val);

    uint8_t decToBcd(unsigned int val);

    // These variables store the time data loaded with loadTime(), and
    // are the source of data when setTime() is called.  It is a
    // good idea to call loadTime() to set up the current values before
    // calling setTime() to ensure RTC data is consistent

    unsigned int seconds;
    unsigned int minutes;
    unsigned int hours;
    unsigned int dayOfWeek;
    unsigned int dayOfMonth;
    unsigned int month;
    unsigned int year;
    bool amPmMode;
    bool pm;

  private:
    mraa::I2c m_i2c;
  };
}