USBSerial on STM32F412ZG (NUCLEO-144)

I am using Mbed OS 6.6 with an STM32F412ZG. When I make a simple project with USBSerial, it builds without issue.

However, when I plug in a USB cable to the “User USB” connector on the opposite side of the board from the built-in ST-Link, the USB does not successfully enumerate.

Is there something special that I need to do to get the USB device to work correctly with the NUCLEO-144 boards? I’m having a similar issue with a NUCLEO-743ZI2-based NUCLEO-144 board and Mbed OS 5.15.

Any help or suggestions would be greatly appreciated.


-Dan Fay


I only know, the DTR signal is required from your serial application on your PC, if the USB was recognized by the PC.

With the H743 there were an issue

BR, Jan