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[未解决] 无法获得ntp的信息

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  • TA的每日心情
    奋斗
    2015-12-10 14:44
  • 签到天数: 1 天

    [LV.1]初来乍到

    发表于 2016-4-13 15:58 | 显示全部楼层 |阅读模式
    IP gateway subnet自己设定的
    ntp.png
  • TA的每日心情

    2018-1-12 16:40
  • 签到天数: 87 天

    [LV.6]常住居民II

    发表于 2016-4-14 23:23 | 显示全部楼层
    换个ntp服务器,还是不行检查网络设置和连接

    该用户从未签到

    发表于 2016-4-15 18:19 | 显示全部楼层
    你好,可以发一下你的程序吗?
  • TA的每日心情
    奋斗
    2015-12-10 14:44
  • 签到天数: 1 天

    [LV.1]初来乍到

     楼主| 发表于 2016-4-18 09:43 | 显示全部楼层
    zweichen 发表于 2016-4-15 18:19
    你好,可以发一下你的程序吗?

    #include <Time.h>
    #include <Ethernet.h>
    #include <EthernetUdp.h>
    #include <SPI.h>

    byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xE2 };
    // NTP Servers:
    IPAddress ip(10,0,49,243);
    IPAddress gateway(10,0,49,254);
    IPAddress subnet(255,255,255,128);
    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 = +8;     // 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);
    //    }
    //  }
      Ethernet.begin(mac,ip,gateway,subnet);
      Serial.print("IP number assigned  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();
    }
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