/*
    DS1307.h
    library for Seeed RTC module

    Copyright (c) 2013 seeed technology inc.
    Author        :   FrankieChu
    Create Time   :   Jan 2013
    Change Log    :

    The MIT License (MIT)

    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.
*/

#include <Wire.h>
#include "DS1307.h"

uint8_t DS1307::decToBcd(uint8_t val) {
    return ((val / 10 * 16) + (val % 10));
}

//Convert binary coded decimal to normal decimal numbers
uint8_t DS1307::bcdToDec(uint8_t val) {
    return ((val / 16 * 10) + (val % 16));
}

void DS1307::begin() {
    Wire.begin();
}
/*Function: The clock timing will start */
void DS1307::startClock(void) {      // set the ClockHalt bit low to start the rtc
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);                      // Register 0x00 holds the oscillator start/stop bit
    Wire.endTransmission();
    Wire.requestFrom(DS1307_I2C_ADDRESS, 1);
    second = Wire.read() & 0x7f;       // save actual seconds and AND sec with bit 7 (sart/stop bit) = clock started
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);
    Wire.write((uint8_t)second);                    // write seconds back and start the clock
    Wire.endTransmission();
}
/*Function: The clock timing will stop */
void DS1307::stopClock(void) {       // set the ClockHalt bit high to stop the rtc
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);                      // Register 0x00 holds the oscillator start/stop bit
    Wire.endTransmission();
    Wire.requestFrom(DS1307_I2C_ADDRESS, 1);
    second = Wire.read() | 0x80;       // save actual seconds and OR sec with bit 7 (sart/stop bit) = clock stopped
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);
    Wire.write((uint8_t)second);                    // write seconds back and stop the clock
    Wire.endTransmission();
}
/****************************************************************/
/*Function: Read time and date from RTC */
void DS1307::getTime() {
    // Reset the register pointer
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);
    Wire.endTransmission();
    Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
    // A few of these need masks because certain bits are control bits
    second     = bcdToDec(Wire.read() & 0x7f);
    minute     = bcdToDec(Wire.read());
    hour       = bcdToDec(Wire.read() & 0x3f);// Need to change this if 12 hour am/pm
    dayOfWeek  = bcdToDec(Wire.read());
    dayOfMonth = bcdToDec(Wire.read());
    month      = bcdToDec(Wire.read());
    year       = bcdToDec(Wire.read());
}
/*******************************************************************/
/*Frunction: Write the time that includes the date to the RTC chip */
void DS1307::setTime() {
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write((uint8_t)0x00);
    Wire.write(decToBcd(second));// 0 to bit 7 starts the clock
    Wire.write(decToBcd(minute));
    Wire.write(decToBcd(hour));  // If you want 12 hour am/pm you need to set bit 6
    Wire.write(decToBcd(dayOfWeek));
    Wire.write(decToBcd(dayOfMonth));
    Wire.write(decToBcd(month));
    Wire.write(decToBcd(year));
    Wire.endTransmission();
}
void DS1307::fillByHMS(uint8_t _hour, uint8_t _minute, uint8_t _second) {
    // assign variables
    hour = _hour;
    minute = _minute;
    second = _second;
}
void DS1307::fillByYMD(uint16_t _year, uint8_t _month, uint8_t _day) {
    year = _year - 2000;
    month = _month;
    dayOfMonth = _day;
}
void DS1307::fillDayOfWeek(uint8_t _dow) {
    dayOfWeek = _dow;
}