ENC28J60 NTP Client (and DHCP) Demo

// Arduino demo sketch for testing the DHCP client code

//

// Original author: Andrew Lindsay

// Major rewrite and API overhaul by jcw, 2011-06-07

//

// Copyright: GPL V2

// See http://www.gnu.org/licenses/gpl.html



#include <EtherCard.h>

#include <Wire.h>

#include "RTClib.h"  // Credit: Adafruit





RTC_DS1307 RTC;





static byte ntpServer[] = {194,109,6,2}; //ntp.xs4all.nl but you can cange in any public ntp server.

uint8_t ntpMyPort = 123;

long timeZoneOffset = 3600L; //Winter (original) time Europe

boolean networkConnection = true;





static byte mymac[] = { 0x01,0x02,0x03,0x04,0x05,0x06 }; //Change this in a unique mac adres for your network



byte Ethernet::buffer[700];





void setup () {

  Serial.begin(9600);



  // Instantiate the RTC

  Wire.begin();

  RTC.begin();





  // Check if the RTC is running.

  if (! RTC.isrunning()) {

    Serial.println("RTC is NOT running");

  } else {

    Serial.println("RTC present");

  }





  Serial.println(F("\n[testDHCP]"));



  Serial.print("MAC: ");

  for (byte i = 0; i < 6; ++i) {

    Serial.print(mymac[i], HEX);

    if (i < 5)

      Serial.print(':');

  }

  Serial.println();



  int i = 1;

  int DHCP = 0;

   //Try to get dhcp settings 3 times before giving up

  Serial.println("Resolve dhcp ...");

  lcd.setCursor(0,0);

  lcd.print("Resolve dhcp ...");

  



  while( DHCP == 0 && i < 3){

    Serial.print("Trying to resolve DHCP attempt nr. ");

    Serial.println(i);

    lcd.setCursor(i,1);

    lcd.print("*");

    delay(1000);

    DHCP = ether.begin(sizeof Ethernet::buffer, mymac);

    i++;

    }



  //Serial.println(F("Setting up DHCP"));

  if (!ether.dhcpSetup()) {

    Serial.println(F("DHCP failed"));

    lcd.setCursor(0,1);

    lcd.print("DHCP failed");

    networkConnection = false;

    }

  

  ether.printIp("My IP: ", ether.myip);

  ether.printIp("Netmask: ", ether.netmask);

  ether.printIp("GW IP: ", ether.gwip);

  ether.printIp("DNS IP: ", ether.dnsip);



  //you can output this to lcd, oled or 7-segment

  uint8_t  *ipPtr = ether.myip;

  String ip0 = String(ipPtr[0], DEC);

  String ip1 = String(ipPtr[1], DEC);

  String ip2 = String(ipPtr[2], DEC);

  String ip3 = String(ipPtr[3], DEC);





  //Get time from DS3231

  DateTime now = RTC.now();

  unsigned long epoch  = now.unixtime();





  //If network connection is true, sync with ntp server

  if (networkConnection) {epoch  = getNtpTime();}

  if (epoch == 0) {DateTime now = RTC.now(); epoch  = now.unixtime();} //sync failed, use DS3231 time instead



  //Check summer / winter time

  if (adjustDstEurope()) {epoch = epoch + 3600; timeZoneOffset = 7200L;}

  RTC.adjust(epoch);

  now = RTC.now();



  Serial.println(epoch);

} //End of setup





unsigned long getNtpTime() {

  unsigned long timeFromNTP;

  const unsigned long seventy_years = 2208988800UL;

  int i = 60; //Number of attempts

  Serial.println("NTP request sent");

  while(i > 0) {

  ether.ntpRequest(ntpServer, ntpMyPort);

      Serial.print("."); //Each dot is a NTP request

      word length = ether.packetReceive();

      ether.packetLoop(length);

      if(length > 0 && ether.ntpProcessAnswer(&timeFromNTP,ntpMyPort)) {

        Serial.println();

        Serial.println("NTP reply received");

        return timeFromNTP - seventy_years + timeZoneOffset;      

      }

      delay(500);

      i--;

    }

  Serial.println();

  Serial.println("NTP reply failed");

  return 0;

}





boolean adjustDstEurope()

{

  // Get the current time

  DateTime now = RTC.now();   

  // last sunday of march

  int beginDSTDate= (31 - (5* now.year() /4 + 4) % 7);

  int beginDSTMonth=3;

  //last sunday of october

  int endDSTDate= (31 - (5 * now.year() /4 + 1) % 7);

  int endDSTMonth=10;

  // DST is valid as:

  if (((now.month() > beginDSTMonth) && (now.month() < endDSTMonth))

    || ((now.month() == beginDSTMonth) && (now.day() >= beginDSTDate))

    || ((now.month() == endDSTMonth) && (now.day() < endDSTDate)))

    return true; // DST europe = GMT +2

  else return false; // nonDST europe = GMT +1

}





void loop () {

  // Get the current time

  DateTime now = RTC.now();   



  unsigned long newHour = now.hour();

  unsigned long newMinute = now.minute();

  unsigned long newSecond = now.second();

  unsigned long newYear = now.year();

  unsigned long newMonth = now.month();

  unsigned long newDay = now.day();



  

  int hour1    = (newHour%10);

  int hour10   = (newHour/10);

  int minute1  = (newMinute%10);

  int minute10 = (newMinute/10);

  int second1  = (newSecond%10);

  int second10 = (newSecond/10);

  int year1    = (newYear%10);

  int year10   = ((newYear/10)%10);

  int year100  = ((newYear/100)%10);

  int year1000 = (newYear/1000);

  int month1   = (newMonth%10);

  int month10  = (newMonth/10);

  int day1     = (newDay%10);

  int day10    = (newDay/10);





  //Output to serial console, but you can use lcd, oled or 7-segment

  Serial.print(hour10);

  Serial.print(hour1);

  Serial.print(":");

  Serial.print(minute10);

  Serial.print(minute1);

  Serial.print(":");

  Serial.print(second10);

  Serial.print(second1);

  Serial.print(" ");

  Serial.print(day10);

  Serial.print(day1);

  Serial.print("-");

  Serial.print(month10);

  Serial.print(month1);

  Serial.print("-");

  Serial.print(year1000);

  Serial.print(year100);

  Serial.print(year10);

  Serial.println(year1);



  delay(1000);

  }