Zeit setzen DS1307 RTC

Zeit setzen DS1307 RTC Titelbild
//////////////////////////////////////////
// RTC data and time setter              //
//                                       //
// This sample program allows the user   //
// to set the date and time of an RTC    //
// using I2C.                            //
//                                       //
// Codes by:                             //
// eGizmo Mechatronix Central            //
// Taft, Manila, Philippines             //
// http://www.egizmo.com                 //
// April 15, 2013                        //
///////////////////////////////////////////

#include <Wire.h>
const int DS1307 = 0x68; // Address of DS1307 see data sheets
const char* days[] =
{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
const char* months[] =
{"January", "February", "March", "April", "May", "June", "July", "August","September", "October", "November", "December"};

// Initializes all values:
byte second = 0;
byte minute = 0;
byte hour = 0;
byte weekday = 0;
byte monthday = 0;
byte month = 0;
byte year = 0;

void setup() {
  Wire.begin();
  Serial.begin(9600);
  delay(2000); // This delay allows the MCU to read the current date and time.

  Serial.print("The current date and time is: ");
  printTime();
  Serial.println("Please change to newline ending the settings on the lower right of the Serial Monitor");
  Serial.println("Would you like to set the date and time now? Y/N");

  while (!Serial.available()) delay(10);
  if (Serial.read() == 'y' || Serial.read() == 'Y')

  // This set of functions allows the user to change the date and time
  {
    Serial.read();
    setTime();
    Serial.print("The current date and time is now: ");
    printTime();
  }

  Serial.println("Thank you.");
}

// Continuous function for converting bytes to decimals and vice versa
void loop() {
}
byte decToBcd(byte val) {
  return ((val/10*16) + (val%10));
}
byte bcdToDec(byte val) {
  return ((val/16*10) + (val%16));
}

// This set of codes is allows input of data
void setTime() {
  Serial.print("Please enter the current year, 00-99. - ");
  year = 13;
  Serial.println(year);
  Serial.print("Please enter the current month, 1-12. - ");
  month = 9;
  Serial.println(months[month-1]);
  Serial.print("Please enter the current day of the month, 1-31. - ");
  monthday = 20;
  Serial.println(monthday);
  Serial.println("Please enter the current day of the week, 1-7.");
  Serial.print("1 Sun | 2 Mon | 3 Tues | 4 Weds | 5 Thu | 6 Fri | 7 Sat - ");
  weekday = 6;
  Serial.println(days[weekday-1]);
  Serial.print("Please enter the current hour in 24hr format, 0-23. - ");
  hour = 13;
  Serial.println(hour);
  Serial.print("Please enter the current minute, 0-59. - ");
  minute = 51;
  Serial.println(minute);
  second = 15;
  Serial.println("The data has been entered.");

  // The following codes transmits the data to the RTC
  Wire.beginTransmission(DS1307);
  Wire.write(byte(0));
  Wire.write(decToBcd(second));
  Wire.write(decToBcd(minute));
  Wire.write(decToBcd(hour));
  Wire.write(decToBcd(weekday));
  Wire.write(decToBcd(monthday));
  Wire.write(decToBcd(month));
  Wire.write(decToBcd(year));
  Wire.write(byte(0));
  Wire.endTransmission();
  // Ends transmission of data
}

byte readByte() {
  while (!Serial.available()) delay(10);
  byte reading = 0;
  byte incomingByte = Serial.read();
  while (incomingByte != '\n') {
    if (incomingByte >= '0' && incomingByte <= '9')
      reading = reading * 10 + (incomingByte - '0');
    else;
    incomingByte = Serial.read();
  }
  Serial.flush();
  return reading;
}

void printTime() {
  char buffer[3];
  const char* AMPM = 0;
  readTime();
  Serial.print(days[weekday-1]);
  Serial.print(" ");
  Serial.print(months[month-1]);
  Serial.print(" ");
  Serial.print(monthday);
  Serial.print(", 20");
  Serial.print(year);
  Serial.print(" ");
  if (hour > 12) {
    hour -= 12;
    AMPM = " PM";
  }
  else AMPM = " AM";
  Serial.print(hour);
  Serial.print(":");
  sprintf(buffer, "%02d", minute);
  Serial.print(buffer);
  Serial.println(AMPM);
}

void readTime() {
  Wire.beginTransmission(DS1307);
  Wire.write(byte(0));
  Wire.endTransmission();
  Wire.requestFrom(DS1307, 7);
  second = bcdToDec(Wire.read());
  minute = bcdToDec(Wire.read());
  hour = bcdToDec(Wire.read());
  weekday = bcdToDec(Wire.read());
  monthday = bcdToDec(Wire.read());
  month = bcdToDec(Wire.read());
  year = bcdToDec(Wire.read());
}

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