目的：ESP32-WROVER-DEV相机模块连接W5500模块，实现有线网络的连接。
开发环境：Arduino 2.1.1
可以实现的功能：可以使用web的ping访问，ESP32的LED IO2闪烁。
硬件连接如下图：
模块硬件的导线连接
| W5500 | ESP32-WROVER | 导线颜色 | |
| W5500-5V | 连接5V-USB | 红 | |
| W5500-GND | 连接GND-USB | 黑 | |
| W5500-MISO | 12灰 | 灰 | |
| W5500-MOSI | 13白 | 白 | |
| W5500-SCS | 15褐 | 褐 | |
| W5500-SCLK | 14紫 | 紫 | |
| 2 橙 | 橙 |
Arduino的设置
第一步：修改server代码，
修改文件：
C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.9\cores\esp32\server.h.
class Server: public Print
{
public:
//virtual void begin(uint16_t port=0) =0;//20240123 yzp
virtual void begin() = 0;
};
以上修改只能使用于使用ESP32和W5500实现有线以太网通讯。
第二步：针对硬件连接，匹配ESP32的IO，修改内容如下：
#define SCK 14
#define MISO 12
#define MOSI 13
#define SS 15
将上面的4行定义直接添加在SPI.H文件开始部分，文件位置查看编译过程中出现的：“使用缓存库文件依赖项：
C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.9\libraries\SPI\src\SPI.h”
第三步：主程序代码如下：
#include <Ethernet.h>
#define LED_BUILTIN 2
//#define SCK 14
//#define MISO 12
//#define MOSI 13
//#define SS 15
IPAddress ip(192,168,2,211);
EthernetServer server(80);
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
boolean alreadyConnected = false; // whether or not the client was connected previously
uint16_t xi = 0;
void setup()
{
delay(4000);
//Ethernet.init(SS);
Serial.begin(115200);
while (!Serial)
{
; // wait for serial port to connect. Needed for Leonardo only
}
delay(2000);
Serial.println("COM0 setup OK!");
pinMode(LED_BUILTIN, OUTPUT);
Serial.println("LED_BUILTIN = " + String(LED_BUILTIN));
Serial.println("SCK = " + String(SCK));
Serial.println("MISO = " + String(MISO));
Serial.println("MOSI = " + String(MOSI));
Serial.println("SS = " + String(SS));//Serial.println("SS = " + String(SPI.pinSS()));//
Ethernet.init(SS);
delay(2000);
Ethernet.begin(mac, ip);
// start the server
auto hwStatus = Ethernet.hardwareStatus();
switch (hwStatus)
{
case EthernetNoHardware:
Serial.println("No Ethernet hardware");
break;
case EthernetW5100:
Serial.println("Ethernet W5100 installed");
break;
case EthernetW5200:
Serial.println("Ethernet W5200 installed");
break;
case EthernetW5500:
Serial.println("Ethernet W5500 installed");
break;
}
auto link = Ethernet.linkStatus();
Serial.print("Link status: ");
switch (link)
{
case Unknown:
Serial.println("Unknown");
break;
case LinkON:
Serial.println("ON");
break;
case LinkOFF:
Serial.println("OFF");
break;
}
server.begin();
Serial.print("server start at IP address: ");
Serial.println(Ethernet.localIP());
}
void loop()
{
// wait for a new client:
EthernetClient client = server.available();
xi++;
if (xi > 40000)
{
xi = 0;
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}
// when the client sends the first byte, say hello:
if (client)
{
if (!alreadyConnected)
{
// clear out the input buffer:
client.flush();
Serial.println("We have a new client");
client.println("Hello, client!");
alreadyConnected = true;
}
if (client.available() > 0)
{
// read the bytes incoming from the client:
char thisChar = client.read();
// echo the bytes back to the client:
server.write(thisChar);
// echo the bytes to the server as well:
Serial.write(thisChar);
}
}
}
第四步：编译上传成功后，串口可以看到网络启动，网络ping有响应。观察结果如下：
