Porting W5500 on STM32 with TCP/UDP/Web Server Support
Ported W5500 on STM32 via SPI. Supports DHCP, TCP/UDP, and a basic web server. Ideal for IoT networking and protocol testing.
STM - STM32F407
x 1
WIZnet - W5500
x 1
ARM - KEIL5
x 1
📎 Introduction
This project demonstrates how to port the WIZnet W5500 Ethernet controller to an STM32 MCU using SPI, and implements a full set of features including:
DHCP and static IP configuration
TCP Server / Client communication
UDP data transmission
Embedded HTTP Web Server (controlling a GPIO-LED via browser)
The project uses the WIZnet official ioLibrary and is suitable for embedded developers looking to learn real-world network stack implementation with W5500.
🔧 Hardware & Software Used
MCU: STM32F407 series
Ethernet Chip: WIZnet W5500
IDE: STM32CubeMX + Keil MDK5 / STM32 HAL
Protocols: SPI, DHCP, TCP, UDP, HTTP
Libraries: WIZnet ioLibrary (socket.c/h, wizchip_conf.c/h, w5500.c/h)
Interface: SPI (up to 80MHz)
Additional: UART, Timer, GPIO, LED
📁 Software Structure
Libraries Imported:
wizchip_conf.c/h
socket.c/h
w5500.c/h
DHCP.c/h
httpServer.c/h
Key Files:
main.c – System init, DHCP config, TCP/UDP/WebServer loop
W5500_Init() – SPI + GPIO init, Registering callback functions
PrintInfo() – Real-time IP/MAC info display
W5500_TCP_Server()/Client() – TCP communication handlers
W5500_UDP() – Lightweight data echo
W5500_WebServer_Init()/Start() – Custom HTML control via GET parameters
🌐 Network Initialization Logic
DHCP support using DHCP_run() with retry logic
Manual static IP fallback when DHCP fails
Registers used: setSHAR, setSIPR, setSUBR, setGAR, ctlnetwork()
DHCP callback optional: reg_dhcp_cbfunc()
📡 TCP / UDP Communication
| Mode | Description |
|---|---|
| TCP Server | Listens on port 8080, echoes client data |
| TCP Client | Connects to a remote server, sends + receives |
| UDP | Receives data from any IP/port and echoes it back |
Socket state machines are managed using getSn_SR()
SOCK_CLOSED, SOCK_INIT, SOCK_ESTABLISHED, etc.
🌍 Embedded Web Server (HTTP)
Supports GET requests via browser
Parses ?action=1 and ?action=2 to turn on/off LED
HTML file is embedded as a C string and served dynamically
Based on httpServer_run() from WIZnet's library
🧠 What You Will Learn
How to port and configure WIZnet W5500 in STM32 environment
Practical implementation of DHCP and IP networking
TCP/UDP communication from scratch using low-level socket API
How to build a minimal web server for embedded control
Integration of SPI communication with network stack
📦 Resources
🧩 Target Audience
Embedded system engineers
IoT developers working with Ethernet
Students learning STM32 and network basics
Makers building smart home or data logger devices
📌 Tips
Ensure MAC and IP are unique in LAN environment
Use socket timeout/retry logic for robust behavior
Run the WebServer and TCP echo simultaneously by assigning multiple socket indices (0, 1, 2...)