How to Synchronize RTC Time with WIZnet W5500 on STM32?

This education and maker project uses WIZnet W5500 on an STM32 platform to build wired Ethernet communication with NTP-based RTC time synchronization.

gavinchang

Published July 12, 2026

109 UCC

25 WCC

55 VAR

4 Followers

Original author: bond007Original source (new tab)

Project description

How to Synchronize RTC Time with WIZnet W5500 on STM32? Summary This education and maker project uses WIZnet W5500 on an STM32 platform to build wired Ethernet communication with NTP-based RTC time synchronization. The GitCode project describes STM32 integration with W5500, Ethernet driver porting, NTP time synchronization for accurate RTC calibration, and USART DMA reception for efficient variable-length serial data handling. W5500 provides the Ethernet MAC/PHY, hardwired TCP/IP stack, socket engine, and internal Tx/Rx buffering, while STM32 firmware handles RTC logic, NTP workflow, USART…

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