ESP32 LAN8720 Repeating restart on ETH.begin()

[MedvedBrtnik]

Hi,
I have a problem with the Ethernet library. I am using the LAN8720 Ethernet module. In the previous version 1.x.x, everything works correctly. In version 2.0.x, ESP32 restarts repeatedly on the line with ETH.begin ().
I enclose the source code:
`
#include <ETH.h> // quote to use ETH
#include <WiFi.h>
#include <Wire.h>
#include <WebServer.h> // Introduce corresponding libraries

#define ETH_ADDR 1
#define ETH_POWER_PIN 17 // Do not use it, it can cause conflict during the software reset.
#define ETH_POWER_PIN_ALTERNATIVE 0
#define ETH_MDC_PIN 23
#define ETH_MDIO_PIN 18
#define ETH_TYPE ETH_PHY_LAN8720
#define ETH_CLK_MODE ETH_CLOCK_GPIO0_IN
//#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT

//Static IP configuration
IPAddress local_ip(192, 168, 0, 13);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns1(8, 8, 8, 8);
IPAddress dns2 = (uint32_t)0x00000000;

// Web page
String myhtmlPage =
String("") + "\r\n" +
"" + "\r\n" +
"" + "\r\n" +
" <title>ESP32 WebServer Test</title>" + "\r\n" +
" <script>" + "\r\n" +
" function getData() {" + "\r\n" +
" var xmlhttp;" + "\r\n" +
" if (window.XMLHttpRequest) {" + "\r\n" +
" xmlhttp = new XMLHttpRequest();" + "\r\n" +
" }" + "\r\n" +
" else {" + "\r\n" +
" xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");" + "\r\n" +
" }" + "\r\n" +
" xmlhttp.onreadystatechange = function() {" + "\r\n" +
" if (this.readyState == 4 && this.status == 200) {" + "\r\n" +
" document.getElementById("txtRandomData").innerHTML = this.responseText;" + "\r\n" +
" }" + "\r\n" +
" };" + "\r\n" +
" xmlhttp.open("GET", "getRandomData", true); " + "\r\n" +
" xmlhttp.send();" + "\r\n" +
" }" + "\r\n" +
" </script>" + "\r\n" +
"" + "\r\n" +
"" + "\r\n" +
" <div id="txtRandomData">Random data:" + "\r\n" +
" <input type="button" value="random" onclick="getData()">" + "\r\n" +
"" + "\r\n" +
"";

bool eth_connected = false;

WebServer server(80); // Declare the WebServer object

void handleRoot() // Callback
{
server.send(200, "text/html", myhtmlPage); //!!! Note that returning to the web page requires "text / html" !!!
}

void handleAjax() // Callback
{
String message = "Random data: ";
message += String(random(10000)); // Get random number
server.send(200, "text/plain", message); // Send message back to page
}

void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case SYSTEM_EVENT_ETH_START:
Serial.println("ETH Started");
//set eth hostname here
ETH.setHostname("VArio-eth");
break;
case SYSTEM_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case SYSTEM_EVENT_ETH_GOT_IP:
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
}
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case SYSTEM_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
connectWiFi();
break;
case SYSTEM_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
}
}

void connectWiFi() {
WiFi.begin("kiwi", "2XkolemKola");
Serial.print("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to the WiFi network with IP address:");
Serial.println(WiFi.localIP());
}

void setup() {
pinMode(ETH_POWER_PIN_ALTERNATIVE, OUTPUT);
digitalWrite(ETH_POWER_PIN_ALTERNATIVE, LOW);
delay(250);
digitalWrite(ETH_POWER_PIN_ALTERNATIVE, HIGH);

Serial.begin(115200);
Serial.println("Start...");

Serial.println("Setting for event Eth.");
WiFi.onEvent(WiFiEvent);

Serial.println("Configure Eth.");
//The problem is manifested a line below.
ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); // Enable ETH

//Serial.println("Configure IPv4 address.");
//ETH.config(local_ip, gateway, subnet, dns1, dns2); // Static IP, leave without this line to get IP via DHCP

int counter = 0;
while (!((uint32_t)ETH.localIP())) {
delay(500);
Serial.print(".");
counter++;
if (counter > 20) {
break;
}
} // Waiting for IP (leave this line group to get IP via DHCP)

if (!eth_connected) connectWiFi();

server.on("/", handleRoot); // Register link and callback function
server.on("/getRandomData", HTTP_GET, handleAjax); // Request and callback function of the get method sent by ajax in the registration web page

server.begin(); // Start server
Serial.println("Web server started");

}

void loop() {
server.handleClient(); // Handling requests from clients
}
`

[khoih-prog]

You can try my wrapper library WebServer_WT32_ETH01, which takes care of the breaking changes in core v2.0.0+.

Check Important Notes

Try this example AdvancedWebServer

[VojtechBartoska]

@MedvedBrtnik Can we close this as mentioned PR was merged already? Did you test it with those changes?

[VojtechBartoska]

Closing as solved. If needed please reopen the issue.