Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
8 years, 11 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
1 Answer
8 years, 10 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