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Merge branch 'dhcp' of github.com:amcewen/Arduino.

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This includes DCHP support and new UDP API for the Ethernet library.
This commit is contained in:
David A. Mellis
2011-03-23 23:28:33 -04:00
parent efae89ea0e
commit f43c0918ff
25 changed files with 1021 additions and 191 deletions
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34
libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.pde
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@ -20,18 +20,14 @@
#include <Ethernet.h>
#include <Udp.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
// 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 };
byte ip[] = {
192,168,1,177 };
unsigned int localPort = 8888; // local port to listen for UDP packets
byte timeServer[] = {
192, 43, 244, 18}; // time.nist.gov NTP server
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
@ -42,11 +38,16 @@ UDP Udp;
void setup()
{
// start Ethernet and UDP
Ethernet.begin(mac,ip);
Udp.begin(localPort);
Serial.begin(9600);
// 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()
@ -55,8 +56,9 @@ void loop()
// wait to see if a reply is available
delay(1000);
if ( Udp.available() ) {
Udp.readPacket(packetBuffer,NTP_PACKET_SIZE); // read the packet into the buffer
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:
@ -100,7 +102,7 @@ void loop()
}
// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(byte *address)
unsigned long sendNTPpacket(IPAddress& address)
{
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
@ -118,7 +120,9 @@ unsigned long sendNTPpacket(byte *address)
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.sendPacket( packetBuffer,NTP_PACKET_SIZE, address, 123); //NTP requests are to port 123
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer,NTP_PACKET_SIZE);
Udp.endPacket();
}