TCP/UDP Interface for SP2302 + W5500
A practical example of connecting the WIZnet W5500 Ethernet module to the SP2302 SBC using SPI to implement a full TCP server/client and UDP socket interface.
WIZnet - WIZ850io
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Description
This project demonstrates how to add a stable Ethernet interface to the SP2302 SBC using the WIZnet W5500 Ethernet chip via the WIZ850io module over SPI. The implementation enables full TCP server/client and UDP socket communication on a Linux-based system. By configuring the W5500 as a secondary Ethernet interface (eth1) through Netplan and Python socket programming, the system becomes capable of wired communication alongside built-in Wi-Fi (eth0). This makes the project ideal for industrial gateways, embedded device controllers, and IoT edge nodes that require multi-protocol networking. The entire setup is reproducible and lightweight, and shows how WIZnet hardware can bring Ethernet capability to platforms without a native MAC/PHY.
Main Components
- SP2302 SBC (Arm Cortex-A53 SoC)
- WIZnet WIZ850io (W5500-based Ethernet module)
- Ubuntu 22.04
- Python (for TCP/UDP socket communication)
- Netplan for network configuration
- SPI interface via /dev/spidev
Key Features
- Adds full-duplex SPI-based Ethernet (
eth1) to SBC - Supports TCP server, TCP client, and UDP socket
- Lightweight, reliable networking without native Ethernet
- Python-based example code for rapid prototyping
- Dual-interface setup (Wi-Fi + Ethernet)
Target Use Cases
- Industrial IoT gateways
- Embedded Ethernet controllers
- Device-to-device socket communication
- Network resilience via wired fallback
Difficulty
Intermediate – Familiarity with Linux networking, Python sockets, and SPI device setup is recommended.