How to connect the Ethernet Port using w5100 library

How to connect the Ethernet Port using w5100 library

In this example, you will use the Ethernet port on the Ethernet family products.

Harware Required:

Comments:

All Ethernet family products use an Arduino Mega 2560 connected to the w5100 Ethernet chip.

The standard Ethernet shield for arduino use the SPI port where are connected the pins 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS), but for the M-duino Ethernet PLC the standard w5100 library from Arduino IDE the SS function is done by the digital PIN 10 because of was developed for the Arduino UNO board.

Then it is necessary to replace the original w5100.h library  to use the right library on that product.

note:

You can replace that library on:

using WINDOWS:

C:\Program Files (x86))
<Directori standard d’instal·lació>\Arduino\libraries\Ethernet\src\utility\w5100.h

using LINUX:

/Arduino/libraries/Ethernet/src/utility/w5100.h

 

UPLOADING EXAMPLE CODE:

In this example you can get the time from an NTP server

/*

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>


 #define SPI_ETHERNET 53

// 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

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()
 {
 pinMode(SPI_ETHERNET, OUTPUT);
 digitalWrite(SPI_ETHERNET,LOW);

// 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(2000);
 }

// send an NTP request to the time server at the given address
 unsigned long sendNTPpacket(char* 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();
 }

Download the code: ntp_test

 

 

 

 
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