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-/*
-
- Udp NTP Client
-
- Get the time from a Network Time Protocol (NTP) time server
- Demonstrates use of UDP sendPacket and ReceivePacket
- For more on NTP time servers and the messages needed to communicate with them,
- see http://en.wikipedia.org/wiki/Network_Time_Protocol
-
- created 4 Sep 2010
- by Michael Margolis
- modified 9 Apr 2012
- by Tom Igoe
-
- This code is in the public domain.
-
- */
-
-#include <SPI.h>
-#include <Ethernet.h>
-#include <EthernetUdp.h>
-
-// Enter a MAC address for your controller below.
-// Newer Ethernet shields have a MAC address printed on a sticker on the shield
-byte mac[] = {
- 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
-
-unsigned int localPort = 8888; // local port to listen for UDP packets
-
-IPAddress timeServer(192, 43, 244, 18); // time.nist.gov NTP server
-
-const int NTP_PACKET_SIZE= 48; // NTP time stamp is in the first 48 bytes of the message
-
-byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets
-
-// A UDP instance to let us send and receive packets over UDP
-EthernetUDP Udp;
-
-void setup()
-{
- // Open serial communications and wait for port to open:
- Serial.begin(9600);
- while (!Serial) {
- ; // wait for serial port to connect. Needed for Leonardo only
- }
-
-
- // start Ethernet and UDP
- if (Ethernet.begin(mac) == 0) {
- Serial.println("Failed to configure Ethernet using DHCP");
- // no point in carrying on, so do nothing forevermore:
- for(;;)
- ;
- }
- Udp.begin(localPort);
-}
-
-void loop()
-{
- sendNTPpacket(timeServer); // send an NTP packet to a time server
-
- // wait to see if a reply is available
- delay(1000);
- if ( Udp.parsePacket() ) {
- // We've received a packet, read the data from it
- Udp.read(packetBuffer,NTP_PACKET_SIZE); // read the packet into the buffer
-
- //the timestamp starts at byte 40 of the received packet and is four bytes,
- // or two words, long. First, esxtract the two words:
-
- unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
- unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
- // combine the four bytes (two words) into a long integer
- // this is NTP time (seconds since Jan 1 1900):
- unsigned long secsSince1900 = highWord << 16 | lowWord;
- Serial.print("Seconds since Jan 1 1900 = " );
- Serial.println(secsSince1900);
-
- // now convert NTP time into everyday time:
- Serial.print("Unix time = ");
- // Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
- const unsigned long seventyYears = 2208988800UL;
- // subtract seventy years:
- unsigned long epoch = secsSince1900 - seventyYears;
- // print Unix time:
- Serial.println(epoch);
-
-
- // print the hour, minute and second:
- Serial.print("The UTC time is "); // UTC is the time at Greenwich Meridian (GMT)
- Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
- Serial.print(':');
- if ( ((epoch % 3600) / 60) < 10 ) {
- // In the first 10 minutes of each hour, we'll want a leading '0'
- Serial.print('0');
- }
- Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
- Serial.print(':');
- if ( (epoch % 60) < 10 ) {
- // In the first 10 seconds of each minute, we'll want a leading '0'
- Serial.print('0');
- }
- Serial.println(epoch %60); // print the second
- }
- // wait ten seconds before asking for the time again
- delay(10000);
-}
-
-// send an NTP request to the time server at the given address
-unsigned long sendNTPpacket(IPAddress& address)
-{
- // set all bytes in the buffer to 0
- memset(packetBuffer, 0, NTP_PACKET_SIZE);
- // Initialize values needed to form NTP request
- // (see URL above for details on the packets)
- packetBuffer[0] = 0b11100011; // LI, Version, Mode
- packetBuffer[1] = 0; // Stratum, or type of clock
- packetBuffer[2] = 6; // Polling Interval
- packetBuffer[3] = 0xEC; // Peer Clock Precision
- // 8 bytes of zero for Root Delay & Root Dispersion
- packetBuffer[12] = 49;
- packetBuffer[13] = 0x4E;
- packetBuffer[14] = 49;
- packetBuffer[15] = 52;
-
- // all NTP fields have been given values, now
- // you can send a packet requesting a timestamp:
- Udp.beginPacket(address, 123); //NTP requests are to port 123
- Udp.write(packetBuffer,NTP_PACKET_SIZE);
- Udp.endPacket();
-}
-
-
-
-
-
-
-
-
-
-