ESP32 Forum

Posted: **Tue Jul 12, 2022 3:13 am**

Hi:
There is a issuse: After esp32 run，blocking at。

  while (!((uint32_t)ETH.localIP())) 
  {

  }

At the router web ， i can find this device,but no ipaddress

: 20220712105836.png (6.71 KiB) Viewed 4248 times

Serial1 print :

Code: Select all

11:11:22.438 -> rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
11:11:22.438 -> configsip: 0, SPIWP:0xee
11:11:22.438 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
11:11:22.438 -> mode:DIO, clock div:2
11:11:22.438 -> load:0x3fff0030,len:1184
11:11:22.438 -> load:0x40078000,len:12784
11:11:22.438 -> load:0x40080400,len:3032
11:11:22.438 -> entry 0x400805e4
11:11:22.741 -> 
11:11:22.741 -> Start
11:11:22.741 ->

GPIO :ETH_CLOCK_GPIO0_IN can get 50MHz from lan8702a.
Lan8720 can ouput 1.2V.

Hardware：esp32_wroom_32u + lan8720a

platform io
- framework-arduinoespressif32 @ 3.20003.220626 (2.0.3)
Dependency Graph
|-- Ethernet @ 2.0.0
| |-- WiFi @ 2.0.0
|-- WiFi @ 2.0.0

Code: Select all

#ifdef ETH_CLK_MODE
#undef ETH_CLK_MODE
#endif

#define ETH_NRST 17

#define ETH_CLK_MODE    ETH_CLOCK_GPIO0_IN//ETH_CLOCK_GPIO17_OUT

// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_POWER_PIN   -1

// Type of the Ethernet PHY (LAN8720 or TLK110)
#define ETH_TYPE        ETH_PHY_LAN8720

// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_ADDR        1

// Pin# of the I²C clock signal for the Ethernet PHY
#define ETH_MDC_PIN     23//15

// Pin# of the I²C IO signal for the Ethernet PHY
#define ETH_MDIO_PIN    18//2

#include <Arduino.h>
#include <ETH.h> 
#include <WiFiUdp.h>



WiFiUDP Udp;                      
unsigned int localUdpPort = 2333;



void printETHInfo(void) 
{
  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");
}

void WiFiEvent(WiFiEvent_t event)
{
  switch (event)
  {
  case SYSTEM_EVENT_ETH_START: 
    Serial.println("ETH Started");
    break;
  case SYSTEM_EVENT_ETH_CONNECTED: 
    Serial.println("ETH Connected");
    break;
  case SYSTEM_EVENT_ETH_GOT_IP: 
    Serial.println("ETH GOT IP");
    printETHInfo();
    break;
  case SYSTEM_EVENT_ETH_DISCONNECTED: 
    Serial.println("ETH Disconnected");
    break;
  case SYSTEM_EVENT_ETH_STOP: 
    Serial.println("ETH Stopped");
    break;
  default:
    break;
  }
}


void setup()
{
  Serial.begin(115200);
  Serial.println();

  WiFi.onEvent(WiFiEvent); 


  Serial.println("Start\n");

  pinMode(ETH_MDC_PIN, OUTPUT);
  pinMode(ETH_NRST, OUTPUT);
  digitalWrite(ETH_NRST, 0);
  delay(10);
  digitalWrite(ETH_NRST, 1);
  delay(50);
  digitalWrite(ETH_NRST, 0);
  delay(50);
  digitalWrite(ETH_NRST, 1);
  delay(20);

  
  ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); 
  while (!((uint32_t)ETH.localIP())) 
  {

  }
  Serial.println("Connected");
  Serial.print("IP Address:");
  Serial.println(ETH.localIP());

  Udp.begin(localUdpPort); 
}

void loop()
{
  int packetSize = Udp.parsePacket(); 
  if (packetSize)                    
  {
    char buf[packetSize];
    Udp.read(buf, packetSize); 

    Serial.println();
    Serial.print("Received: ");
    Serial.println(buf);
    Serial.print("From IP: ");
    Serial.println(Udp.remoteIP());
    Serial.print("From Port: ");
    Serial.println(Udp.remotePort());

    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); 
    Udp.print("Received: ");    
    Udp.write((const uint8_t*)buf, packetSize);
    Udp.endPacket();            
  }
}

ESP32 Forum

esp32+lan8720 ethernet cannot get ip address

esp32+lan8720 ethernet cannot get ip address