Добавлена библиотека Time

libraries/Time/examples/TimeNTP/TimeNTP.ino

@@ -0,0 +1,135 @@
+/*
+ * Time_NTP.pde
+ * Example showing time sync to NTP time source
+ *
+ * This sketch uses the Ethernet library
+ */
+ 
+#include <TimeLib.h>
+#include <Ethernet.h>
+#include <EthernetUdp.h>
+#include <SPI.h>
+
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; 
+// NTP Servers:
+IPAddress timeServer(132, 163, 4, 101); // time-a.timefreq.bldrdoc.gov
+// IPAddress timeServer(132, 163, 4, 102); // time-b.timefreq.bldrdoc.gov
+// IPAddress timeServer(132, 163, 4, 103); // time-c.timefreq.bldrdoc.gov
+
+
+const int timeZone = 1;     // Central European Time
+//const int timeZone = -5;  // Eastern Standard Time (USA)
+//const int timeZone = -4;  // Eastern Daylight Time (USA)
+//const int timeZone = -8;  // Pacific Standard Time (USA)
+//const int timeZone = -7;  // Pacific Daylight Time (USA)
+
+
+EthernetUDP Udp;
+unsigned int localPort = 8888;  // local port to listen for UDP packets
+
+void setup() 
+{
+  Serial.begin(9600);
+  while (!Serial) ; // Needed for Leonardo only
+  delay(250);
+  Serial.println("TimeNTP Example");
+  if (Ethernet.begin(mac) == 0) {
+    // no point in carrying on, so do nothing forevermore:
+    while (1) {
+      Serial.println("Failed to configure Ethernet using DHCP");
+      delay(10000);
+    }
+  }
+  Serial.print("IP number assigned by DHCP is ");
+  Serial.println(Ethernet.localIP());
+  Udp.begin(localPort);
+  Serial.println("waiting for sync");
+  setSyncProvider(getNtpTime);
+}
+
+time_t prevDisplay = 0; // when the digital clock was displayed
+
+void loop()
+{  
+  if (timeStatus() != timeNotSet) {
+    if (now() != prevDisplay) { //update the display only if time has changed
+      prevDisplay = now();
+      digitalClockDisplay();  
+    }
+  }
+}
+
+void digitalClockDisplay(){
+  // digital clock display of the time
+  Serial.print(hour());
+  printDigits(minute());
+  printDigits(second());
+  Serial.print(" ");
+  Serial.print(day());
+  Serial.print(" ");
+  Serial.print(month());
+  Serial.print(" ");
+  Serial.print(year()); 
+  Serial.println(); 
+}
+
+void printDigits(int digits){
+  // utility for digital clock display: prints preceding colon and leading 0
+  Serial.print(":");
+  if(digits < 10)
+    Serial.print('0');
+  Serial.print(digits);
+}
+
+/*-------- NTP code ----------*/
+
+const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
+byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
+
+time_t getNtpTime()
+{
+  while (Udp.parsePacket() > 0) ; // discard any previously received packets
+  Serial.println("Transmit NTP Request");
+  sendNTPpacket(timeServer);
+  uint32_t beginWait = millis();
+  while (millis() - beginWait < 1500) {
+    int size = Udp.parsePacket();
+    if (size >= NTP_PACKET_SIZE) {
+      Serial.println("Receive NTP Response");
+      Udp.read(packetBuffer, NTP_PACKET_SIZE);  // read packet into the buffer
+      unsigned long secsSince1900;
+      // convert four bytes starting at location 40 to a long integer
+      secsSince1900 =  (unsigned long)packetBuffer[40] << 24;
+      secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
+      secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
+      secsSince1900 |= (unsigned long)packetBuffer[43];
+      return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
+    }
+  }
+  Serial.println("No NTP Response :-(");
+  return 0; // return 0 if unable to get the time
+}
+
+// send an NTP request to the time server at the given address
+void 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();
+}
+