PaoloP:
Ciao,
potresti fare questa prova?Dovresti riabilitare il DHCP del router, compilare lo sketch qui sotto con l'IDE 1.0. Lanciandolo con l'Arduino collegato direttamente al router e aprendo il serial monitor dovresti vedere una serie di dati tra cui l'indirizzo ip, il gateway. (nella versione 1.0 dell'IDE è stato implementato il supporto del DHCP)
Lo sketch è quello riguardante il server NTP da me modificato per inviare altri dati sulla seriale. Una specie di piccolo debug.#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {
0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA };
unsigned int localPort = 8888; // local port to listen for UDP packets
IPAddress timeServer(192, 43, 244, 18); // 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(9600);
Serial.println("Arduino start!");
// start Ethernet
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
for(;
;
}
else
{
Serial.println("Ethernet configured using DHCP");
Serial.print("Local IP: ");
Serial.println(Ethernet.localIP());
Serial.print("SubnetMask: ");
Serial.println(Ethernet.subnetMask());
Serial.print("Gateway: ");
Serial.println(Ethernet.gatewayIP());
Serial.print("DNS Server: ");
Serial.println(Ethernet.dnsServerIP());
}
if (Udp.begin(localPort) == 0) {
Serial.println("No UDP sockets available");
// no point in carrying on, so do nothing forevermore:
for(;
;
}
else
{
Serial.println("UDP sockets ON");
}
}
void loop()
{
Serial.println("Send Packet");
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(10000);
}
// send an NTP request to the time server at the given address
unsigned long 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();
}
Se funziona, prova poi a scollegare Arduino, ad inserire l'altro switch in cascata e riprovare... e poi anche con i PowerLan. Ho anche io una Ethernet Shield e ogni tanto fa i capricci. Paolo. p.s. ho la UNO R3 e la Ethernet Shield R3 uso l'IDE 1.0
Salve Paolo e grazie per il tuo intervento...
Ho collegato direttamente lo shield al modem router e una volta caricato il tuo sketch in Arduino, ho potuto constatare che tramite serial monitor, si visualizza l'ip assegnato e una serie di send a ciclo infinito; ogni pacchetto trasmesso, viene evidenziato dal lampeggio dello shield e dalle spie di stato LAN del modem.Poi ho anche riprovato con lo switch in cascata collegandoci lo shield, ma sembra non funzionare.
A questo punto, il cerchio si stringe un po', o almeno credo, ma non riesco personalmente, a circoscrivere il problema.
Ciao e grazie ancora