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How to share a programming port between multiple STM32U5 and STM32L4 MCUs

y_yamamoto
Associate II

‎2025-08-13 7:01 PM

I am currently using multiple STM32U5 series and STM32L4 series MCUs in a single system.
I would like to share a single physical programming port (e.g., SWD or UART) among these MCUs and switch between them to program each one individually.

  • I have already confirmed that ST-LINK cannot program multiple MCUs simultaneously.

  • Based on this premise, is it possible to share a programming port between multiple MCUs and still program them individually?

  • If it is possible, could you please advise on the method?

Thank you in advance for your support.

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1 REPLY 1
TDK
Super User

‎2025-08-13 7:24 PM

Can't be done with SWD. You could try JTAG.

Solved: SWD Multi Drop on STM32H5 and target instance - STMicroelectronics Community

Solved: SWD multidrop? Does any STM32 or ST-LINK support i... - STMicroelectronics Community

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