arduino 使用w5500模块（USR-ES1）进行有线连接网口RJ45

一，硬件：

USR-ES1模块这个淘宝上卖的比较火，所以我们用的这个。
板子用mega2560，理论上可以用在任何arduino上，包括stm32，esp系列

二，软件：

VSCODE+PlatformIO+arduino框架
使用的Ethernet3.0，地址：https://github.com/sstaub/Ethernet3

三，接口：

1，RST是硬件复位引脚，一定要接线

2，我一共连了7根线，RST(5)，CS(4)，SCK(52)，MISO(50)，MOSI(51)，3.3V，GND。

Arduino / Genuino Board	MOSI	MISO	SCK	CS (slave)	CS (master)	Level
Uno or Duemilanove	11 or ICSP-4	12 or ICSP-1	13 or ICSP-3	10	–	5V
Mega1280 or Mega2560	51 or ICSP-4	50 or ICSP-1	52 or ICSP-3	53	–	5V
Leonardo	ICSP-4	ICSP-1	ICSP-3	–	–	5V
Due	SPI-4	SPI-1	SPI-3	–	4, 10, 52	3,3V
Zero	ICSP-4	ICSP-1	ICSP-3	–	–	3,3V
101	11 or ICSP-4	12 or ICSP-1	13 or ICSP-3	10	10	3,3V
MKR1000	8	10	9	–	–	3,3V

（上表是arduino的SPI引脚的官网引脚表，CS我们可以自己设置）

可以使用下面2句函数设置CS引脚和RST引脚

//这里Ethernet不改变，且放在实例如client.begin()前面
Ethernet.setCsPin(4);
Ethernet.setRstPin(5);

四，程序

#include <SPI.h>
#include <Ethernet3.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[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "www.baidu.com";    // name address for Google (using DNS)

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 0, 177);

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  Ethernet.setCsPin(4);
  Ethernet.setRstPin(5);
  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip);
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET /search?q=arduino HTTP/1.1");
    client.println("Host: www.baidu.com");
    client.println("Connection: close");
    client.println();
  }
  else {
    // kf you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}
void loop()
{
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }
  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    while (true);
  }
}

五，串口收到的数据如下

connected
HTTP/1.1 301 Moved Permanently
Cache-Control: max-age=86400
Content-Length: 246
Content-Type: text/html; charset=iso-8859-1
Date: Thu, 16 Dec 2021 01:26:03 GMT
Expires: Fri, 17 Dec 2021 01:26:03 GMT
Location: http://www.baidu.com/search/?q=arduino
Server: Apache
Connection: close

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="http://www.baidu.com/search/?q=arduino">here</a>.</p>
</body></html>

disconnecting.

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