Basic Ethernet Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

Overview

This example demonstrates basic usage of internal EMAC and Ethernet driver together with esp_netif. The workflow of the example is as follows:

1. Install Ethernet driver
2. Attach the driver to esp_netif
3. Send DHCP requests and wait for a DHCP lease
4. If get IP address successfully, then you will be able to ping the device

If you have a new simple Ethernet application to go (for example, connect to IoT cloud via Ethernet), try this as a basic template, then add your own code.

[!TIP] For initialization of a wider range of Ethernet PHY chips, including SPI Ethernet modules and for advanced Ethernet configuration options, please use Component for Ethernet Initialization.

How to use example

Hardware Required

To run this example, it's recommended that you have an official Espressif Ethernet capable development board - either ESP32-Ethernet-Kit or ESP32-P4-Function-EV-Board. This example should also work for 3rd party ESP32 board as long as it's integrated with a IEEE 802.3 compliant Ethernet PHY chip and with the default RMII dataplane GPIO configuration.

[!NOTE] Generic 802.3 PHY basic functionality should always work for PHY compliant with IEEE 802.3. However, some specific features might be limited. A typical example is loopback functionality, where certain PHYs may require setting a specific speed mode to operate correctly. If this is a case, use driver tailored to that specific chip.

Pin Assignment

This example uses the default RMII GPIO configuration as defined by ETH_ESP32_EMAC_DEFAULT_CONFIG for the specific ESP32 chip (ESP32, ESP32P4, etc.).

Configure the project

idf.py menuconfig

See common configurations for Ethernet examples from upper level.

Build, Flash, and Run

Build the project and flash it to the board, then run monitor tool to view serial output:

idf.py -p PORT build flash monitor

(Replace PORT with the name of the serial port to use.)

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

I (394) eth_example: Ethernet Started
I (3934) eth_example: Ethernet Link Up
I (3934) eth_example: Ethernet HW Addr 30:ae:a4:c6:87:5b
I (5864) esp_netif_handlers: eth ip: 192.168.2.151, mask: 255.255.255.0, gw: 192.168.2.2
I (5864) eth_example: Ethernet Got IP Address
I (5864) eth_example: ~~~~~~~~~~~
I (5864) eth_example: ETHIP:192.168.2.151
I (5874) eth_example: ETHMASK:255.255.255.0
I (5874) eth_example: ETHGW:192.168.2.2
I (5884) eth_example: ~~~~~~~~~~~

Now you can ping your ESP32 in the terminal by entering ping 192.168.2.151 (it depends on the actual IP address you get).

Troubleshooting

See common troubleshooting for Ethernet examples from upper level.

(For any technical queries, please open an issue on GitHub. We will get back to you as soon as possible.)