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121 lines
3.4 KiB
Plaintext
Executable File
121 lines
3.4 KiB
Plaintext
Executable File
/*
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* Time_NTP.pde
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* Example showing time sync to NTP time source
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*
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* This sketch uses the Ethenet library with the user contributed UdpBytewise extension
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*/
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#include <Time.h>
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#include <Ethernet.h>
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#include <UdpBytewise.h> // UDP library from: bjoern@cs.stanford.edu 12/30/2008
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#if UDP_TX_PACKET_MAX_SIZE <64 || UDP_RX_PACKET_MAX_SIZE < 64
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#error : UDP packet size to small - modify UdpBytewise.h to set buffers to 64 bytes
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#endif
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/*
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*
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* You may need to modify the UdpBytewise.h library to allow enough space in the buffers for the NTP packets.
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* Open up UdpBytewse.h and set the following buffers to 64 bytes:
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* #define UDP_TX_PACKET_MAX_SIZE 64
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* #define UDP_RX_PACKET_MAX_SIZE 64
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*/
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byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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byte ip[] = { 192, 168, 1, 44 }; // set the IP address to an unused address on your network
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byte SNTP_server_IP[] = { 192, 43, 244, 18}; // time.nist.gov
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//byte SNTP_server_IP[] = { 130,149,17,21}; // ntps1-0.cs.tu-berlin.de
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//byte SNTP_server_IP[] = { 192,53,103,108}; // ptbtime1.ptb.de
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time_t prevDisplay = 0; // when the digital clock was displayed
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const long timeZoneOffset = 0L; // set this to the offset in seconds to your local time;
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void setup()
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{
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Serial.begin(9600);
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Ethernet.begin(mac,ip);
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Serial.println("waiting for sync");
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setSyncProvider(getNtpTime);
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while(timeStatus()== timeNotSet)
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; // wait until the time is set by the sync provider
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}
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void loop()
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{
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if( now() != prevDisplay) //update the display only if the time has changed
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{
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prevDisplay = now();
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digitalClockDisplay();
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}
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}
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void digitalClockDisplay(){
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// digital clock display of the time
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Serial.print(hour());
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printDigits(minute());
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printDigits(second());
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Serial.print(" ");
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Serial.print(day());
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Serial.print(" ");
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Serial.print(month());
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Serial.print(" ");
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Serial.print(year());
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Serial.println();
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}
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void printDigits(int digits){
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// utility function for digital clock display: prints preceding colon and leading 0
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Serial.print(":");
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if(digits < 10)
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Serial.print('0');
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Serial.print(digits);
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}
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/*-------- NTP code ----------*/
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unsigned long getNtpTime()
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{
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sendNTPpacket(SNTP_server_IP);
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delay(1000);
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if ( UdpBytewise.available() ) {
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for(int i=0; i < 40; i++)
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UdpBytewise.read(); // ignore every field except the time
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const unsigned long seventy_years = 2208988800UL + timeZoneOffset;
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return getUlong() - seventy_years;
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}
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return 0; // return 0 if unable to get the time
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}
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unsigned long sendNTPpacket(byte *address)
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{
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UdpBytewise.begin(123);
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UdpBytewise.beginPacket(address, 123);
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UdpBytewise.write(B11100011); // LI, Version, Mode
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UdpBytewise.write(0); // Stratum
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UdpBytewise.write(6); // Polling Interval
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UdpBytewise.write(0xEC); // Peer Clock Precision
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write_n(0, 8); // Root Delay & Root Dispersion
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UdpBytewise.write(49);
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UdpBytewise.write(0x4E);
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UdpBytewise.write(49);
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UdpBytewise.write(52);
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write_n(0, 32); //Reference and time stamps
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UdpBytewise.endPacket();
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}
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unsigned long getUlong()
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{
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unsigned long ulong = (unsigned long)UdpBytewise.read() << 24;
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ulong |= (unsigned long)UdpBytewise.read() << 16;
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ulong |= (unsigned long)UdpBytewise.read() << 8;
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ulong |= (unsigned long)UdpBytewise.read();
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return ulong;
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}
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void write_n(int what, int how_many)
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{
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for( int i = 0; i < how_many; i++ )
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UdpBytewise.write(what);
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}
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