WIZnet Ethernet HAT[RP2040] + Loopback

Overview

WIZnet Ethernet HAT (Hardware Attached on Top) is a Raspberry Pi Pico pin-compatible board that utilizes W5100S and supports both 3.3V & 5V.

Please refer to this link to find more information about W5100S.

• Raspberry Pi Pico Pin-Compatible
• Ethernet (W5100S Hardwired TCP/IP CHIP)
• Product page : https://docs.wiznet.io/Product/iEthernet/W5100S/overview
• Support 4 Independent Hardware SOCKETs simultaneously
• Support SOCKET-less new Command: ARP-Request, PING-Request
• Support Auto-MDIX only when Auto-Negotiation mode

WIZnet Ethernet HAT

RP2040 Datasheet – https://www.raspberrypi.org/documentation/microcontrollers/raspberry-pi-pico.html

RP2040

Prepare

Prepare Hardware

1. Combine WIZnet Ethernet HAT with Raspberry Pi Pico.

2. Connect ethernet cable to Ethernet HAT ethernet port.

3. Connect Raspberry Pi Pico to desktop or laptop using 5 pin micro USB cable.

– If you use W5100S-EVB-Pico, you can skip ‘1. Combine…’

Prepare Software

1.Installing CircuitPython

Install CircuitPython on Raspberry Pi Pico by referring to the link above.

https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython/circuitpython

• Download the below uf2 file link on your computer

CircuitPython 7.0.0 – https://downloads.circuitpython.org/bin/raspberry_pi_pico/en_US/adafruit-circuitpython-raspberry_pi_pico-en_US-7.0.0.uf2

2.Setup WIZnet Ethernet Library

Copy the WIZnet library Into the lib folder inside the Raspberry Pi Pico. https://learn.adafruit.com/ethernet-for-circuitpython/circuitpython-setup

Before continuing, make sure your board’s lib folder has at least the following files and folders copied over: https://github.com/Wiznet/RP2040-HAT-CircuitPython

adafruit_bus_device

adafruit_wiznet5k

CIRCUITPY/lib

Run PICO

1.Install Programs

The following serial terminal program is required for Loopback test, download and install from below links.

✔Tera Term

✔Hercules

Before this, you should find the Raspberry Pi Pico COM port number from “Device Manager” on your PC.

2. How to LoopbackExample

Setup LoopbackExample – download https://github.com/Wiznet/RP2040-HAT-CircuitPython/tree/master/examples/Loopback

– The server was created by opening the socket with IP address 192.168.1.100 and PORT 5000.

Open the Hercules program to set [IP Address] and [PORT number] and Connect to the Server.

You can check through the terminal that the client has accessed the server.

If you send the phrase Loopback Test, you can see that you are sending and receiving data.