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September 5, 2026
Question

STM32F411RE NUCLEO STLINK I2C issue STLINK NOT FOUND

  • September 5, 2026
  • 0 replies
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I have encountered a specific issue using the STM32F411RE NUCLEO Board and I2C peripherals:

The problem:
When i plug in the board with I2C devices (DFROBOT BMM150, MPU6050, ADAFRUIT ICM20948) already connected to the board my PC (LINUX) cannot find the device.
when trying to flash CUBEIDE says something along the lines of ‘STLINK not found’ 
and PROBE-RS says:
ERROR nusb::error: interface not found (errno 2) WARN probe_rs::probe::list::linux: Make sure you have reloaded udev rules after setting everything up WARN probe_rs::probe::list::linux: Read more under https://probe.rs/docs/getting-started/probe-setup/ Error: Failed to open probe: Failed to open the debug probe. Caused by: 0: The debug probe could not be created. 1: A USB error occurred. 2: interface not found (errno 2)

The fix:
1) UNPLUG BOARD
2) DISCONNECT I2C peripherals
3) PLUG in BOARD
4) RECONNECT I2C peripherals
5) the STLINK is found again and I can flash code like normal

Will this be an issue if I design a PCB with permanently connect I2C devices, and using and external STLINKV3 programmer with a STDC14 connection to program and flash?