Description

For stm32f4 and stm32f1 based cpu, having debug enabled and writing something in the init seems to prevent from interacting.

Steps to reproduce the issue

Enable debug and print in the i2c init of a stm32f4 or f1 board.

Expected results

See the output of the debug print

Actual results

Nothing gets printed and trying to write to the shell yields no result.

Mentioned in #10608