4 years, 5 months ago.

Nucleo F401RE board - External 3.3V - SWD ERROR

Hi, I've just cutted off STLINK PCB from my Nucleo F401RE board and reconnected to the STLINK via SWD pins (CN4).

If I power up the F401RE board with +5V on Vin pin (with JP6 ON and SB2 ON) then STLINK works well and program the MCU. If I power up the F401RE board with +3.3V the board works, the firmware runs, but STLINK won't see the board and says "SWD ERROR".

Is there something that I don't understand?

Please help

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1 Answer

4 years, 3 months ago.

"When NUCLEO is power supplied by +3V3, the ST-LINK is not powered thus the programming and debug features are unavailable."

http://www.st.com/web/en/resource/technical/document/user_manual/DM00105823.pdf

Section 5.3.3


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