Unstable swdio swclk connection to STM32N6 using Programmer Hadware

Nixxen · ‎2026-03-24

When connecting to our stm32n6 using a stm32 Programmer we get an unstable connection. Connecting with a low clock rate (5khz instead of 8000khz) improved the Issue but there still isn't a reliable way to connect to the board. Some retries are needed to get a connection. Also after some time the connection doesnt work entierly and the MCU needs to be powercycled.

Amine_Jridi · ‎2026-04-01

Hello @Nixxen,

Could you provide the error message you get when the connection fails? As a first check also try with a different cable, to rule out any cable/connection issue.

Also, are you using CubeProgrammer CLI or GUI? On my side, I am not able to reproduce the issue after several attempts, testing all available frequencies.

Thanks,

Amine.

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