zugegeben nur zusammengepfuscht aber so klappts jetzt mit der TimeLib.h
Ich lass das mal für Google da.
NTP Abfrageintervall muss man halt vernünfigt setzen:
/*
Udp NTP Client - new
- without delay in loop
- uses TimeLib.h
- sets time for TimeLib.h
*/
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <TimeLib.h> // library manager Version 1.6.1
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(172, 18, 67, 96);
byte dns[] = { 8, 8, 8, 8 };
byte gateway[] = { 172, 18, 67, 230 };
byte subnet[] = {255, 255, 255, 0 };
unsigned int localPort = 8888; // local port to listen for UDP packets
const char timeServer[] = "time.nist.gov"; // 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() {
Serial.begin(115200);
Serial.println(F("UdpNtpClient NEW"));
// start Ethernet and UDP
//Ethernet.begin(mac); // DNS
//Ethernet.begin(mac, ip, subnet, gateway); // lange benutzt - geht warum auch immer
//Ethernet.begin(mac, ip, dns, gateway); //
Ethernet.begin(mac, ip, dns, gateway, subnet);
//delay(1000); // angst delay ... geben wir dem W5100 etwas zeit.
Udp.begin(localPort);
Serial.println(F("End Setup"));
}
void loop() {
timerClock(); // print the current time
timerNtp(); // check if it is time to sync with NTP
checkIncommingUdp(); // check if we received some UDP packet
//Ethernet.maintain(); // only if IP optained by DHCP: renew lease time
}
void checkIncommingUdp()
{
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, extract 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
// machma was draus für die timelib
setTime(epoch); // use the epoch, not the secSince1900
}
}
void timerClock()
{
static uint32_t previousMillis = -1000;
if (millis() - previousMillis > 1000)
{
previousMillis = millis();
Serial.print(hour());
Serial.print(":");
Serial.print(minute());
Serial.print(":");
Serial.print(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
if (timeStatus() == timeNotSet) Serial.print(" not set"); else Serial.print(" set");
Serial.println();
}
}
void timerNtp()
{
static uint32_t previousMillis = -30000;
if (millis() - previousMillis > 30000)
{
previousMillis = millis();
while (Udp.parsePacket() > 0) ; // discard any previously received packets - aus dem time.h beispiel
sendNTPpacket(timeServer); // send an NTP packet to a time server
}
}
// send an NTP request to the time server at the given address
void sendNTPpacket(const char * address) {
Serial.println(F("send NTP packet"));
// 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();
}