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dbessone
Explorer II
April 13, 2026
Solved

Debug modes

  • April 13, 2026
  • 2 replies
  • 202 views

I noticed that STM32CubeMX2 (DEBUG features page) offers only three debug modes: JTAG 4‑pin, JTAG 5‑pin, and Single Wire Trace Asynchronous.
In many practical cases, developers use only the SWCLK and SWDIO lines to save pins, so the absence of a simple Serial Wire option (without Trace) seems to be a limitation of the current STM32CubeMX2 release.
This option is still available in STM32CubeMX1 when working with similar MCUs, such as the STM32H5 series.
Is this understanding correct?

    Best answer by Saket_Om

    Hello ​@dbessone 

    The issue has been solved in the new STM32C5 Ecosystem release 2.1.0. 

    2 replies

    S
    STackPointer64
    ST Employee
    April 13, 2026

    Hello @dbessone, and Welcome to ST Community!

    This issue has already been reported internally under ticket number CDM0060745, so the trace line is not pin-locked when Serial Wire is selected.

    Best regards,

    To improve visibility of answered topics, please click 'Accept as Solution' on the reply that resolved your issue or answered your question.
      S
      Saket_OmBest answer
      ST Technical Moderator
      June 25, 2026

      Hello ​@dbessone 

      The issue has been solved in the new STM32C5 Ecosystem release 2.1.0. 

      In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Saket_Om
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