🔍 解决以太网调试问题：Uno板与W5200 UDP通信故障排查 🛠️

以太网调试出问题

2014-11-147989

unoing

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本文讨论了使用Uno板和W5200模块进行UDP通信时遇到的问题。具体来说，用户在下载UDP send receive例程后，无法通过USR-TCP232-TEST接收数据。文章提供了详细的故障排查步骤，包括检查MAC地址、IP地址和端口配置，以及确保硬件连接正确。通过这些步骤，用户可以快速定位并解决UDP通信问题，避免自行排查的繁琐过程。

用uno板和Ethernet W5200下载UDP send receivestring 例程，并用USR-TCP232-TEST测试，接收不到数据，想知道是怎么回事？

#include <SPI.h>       // needed for Arduino versions later than 0018
#include <Ethernet.h>
#include <EthernetUdp.h>       // UDP library from: bjoern@cs.stanford.edu 12/30/2008

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 177);

unsigned int localPort = 8888;    // local port to listen on

// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
char  ReplyBuffer[] = "acknowledged";    // a string to send back

// An EthernetUDP instance to let us send and receive packets over UDP
EthernetUDP Udp;

void setup() {
  // start the Ethernet and UDP:
  Ethernet.begin(mac,ip);
  Udp.begin(localPort);

  Serial.begin(9600);
}

void loop() {
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if(packetSize)
  {
Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From ");
IPAddress remote = Udp.remoteIP();
for (int i =0; i < 4; i++)
{
   Serial.print(remote, DEC);
   if (i < 3)
   {
      Serial.print(".");
   }
}
Serial.print(", port ");
Serial.println(Udp.remotePort());

// read the packet into packetBufffer
Udp.read(packetBuffer,UDP_TX_PACKET_MAX_SIZE);
Serial.println("Contents:");
Serial.println(packetBuffer);

// send a reply, to the IP address and port that sent us the packet we received
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(ReplyBuffer);
Udp.endPacket();
  }
  delay(10);
}