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During my work on Teensy 4.1 support in ChibiOS for the QMK keyboard firmware, I noticed that ChibiOS’s virtual serial device USB demo would sometimes print garbled output, and that I would never see the ChibiOS shell prompt. This article walks you through diagnosing and working around this issue, in the hope that it helps others who are working with micro controllers and USB virtual serial devices. Background Serial interfaces are often the easiest option when working with micro controllers to ...