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Published February 27, 2026 ©

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How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?

This project demonstrates real-time UDP communication using STM32 and the WIZnet W5500 Ethernet controller.

COMPONENTS
PROJECT DESCRIPTION

How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?

(STM32와 W5500으로 이더넷 기반 실시간 UDP 통신 구현하기)


Project Summary (55 words)

This project demonstrates real-time UDP communication using STM32 and the WIZnet W5500 Ethernet controller. By leveraging hardware UDP/IP offloading over wired Ethernet, the system achieves low-latency data transmission suitable for educational networking experiments, LAN-based telemetry, and lightweight industrial communication applications.


System Architecture Overview

Core Components

STM32

Data acquisition

Packet formatting

Application logic

W5500

Hardware TCP/IP stack

Native UDP socket support

SPI interface

Ethernet connectivity


Network Architecture & Protocol Flow

Layered Model

 
Application (STM32)
        ↓
UDP (W5500)
        ↓
IP (W5500)
        ↓
Ethernet PHY
 

Data Flow

STM32 → SPI → W5500 → Ethernet → Client Device


Why Choose UDP?

FeatureUDP
Handshake requiredNo
LatencyLow
Reliability guaranteeNo
OverheadMinimal

UDP is ideal for:

Real-time sensor streaming

Broadcast communication

Discovery protocols

Educational demonstrations


Ethernet vs Wi-Fi for UDP

AspectW5500 EthernetWi-Fi
Latency variationLowHigher
Packet stabilityHighVariable
RF interferenceNonePossible
DeterminismStrongModerate

For educational labs, Ethernet ensures consistent experimental results.


Educational Perspective

This project helps students understand:

Difference between TCP and UDP

Network layering principles

Hardware TCP/IP offloading benefits

Real-time communication trade-offs

It provides a clear and practical introduction to embedded Ethernet networking.


FAQ (WIZnet-Focused)

Q1: Why use W5500 for UDP communication?
A: W5500 provides hardware UDP/IP processing, reducing MCU overhead and improving determinism.

Q2: How does STM32 communicate with W5500?
A: Through an SPI interface.

Q3: Is UDP suitable for industrial use?
A: Yes, especially for real-time telemetry where occasional packet loss is acceptable.

Q4: Can this be extended to TCP?
A: Yes. W5500 supports both TCP and UDP sockets.

Q5: Is this suitable for education?
A: Yes. It clearly demonstrates connectionless communication and network layering.


Tags

#W5500 #STM32 #UDP #Ethernet #EmbeddedNetworking #Education #IndustrialIoT



🇰🇷 KOREAN VERSION

STM32와 W5500으로 이더넷 기반 실시간 UDP 통신을 구현하는 방법은?

(How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?)


프로젝트 개요 (55단어)

이 프로젝트는 STM32와 WIZnet W5500 이더넷 컨트롤러를 사용하여 UDP 기반 실시간 통신을 구현합니다. 하드웨어 UDP/IP 오프로딩을 통해 낮은 지연시간과 안정적인 유선 통신을 제공하며, 교육용 네트워크 실습 및 경량 산업 통신에 적합합니다.


시스템 구성

STM32: 데이터 수집 및 패킷 생성

W5500: 하드웨어 UDP/IP 처리

Ethernet: 안정적인 유선 통신


네트워크 아키텍처

STM32 → SPI → W5500 → Ethernet → 수신 장치

UDP는 핸드셰이크 없이 빠른 전송이 가능합니다.


Ethernet vs Wi-Fi

이더넷은:

낮은 지연 변동

RF 간섭 없음

예측 가능한 동작

교육 환경에 적합합니다.


FAQ

Q1: 왜 W5500을 사용하나요?
A: 하드웨어 UDP 처리를 통해 MCU 부하를 줄이기 위해서입니다.

Q2: STM32와 연결 방식은?
A: SPI 인터페이스입니다.

Q3: 산업용에도 적합합니까?
A: 실시간 텔레메트리 용도로 적합합니다.

Q4: TCP로 확장 가능합니까?
A: 네, W5500은 TCP도 지원합니다.

Q5: 교육용으로 좋은가요?
A: 네, TCP와 UDP의 차이를 학습하기에 적합합니다.

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