Web Reference: Jan 22, 2026 · Below is a practical, step-by-step guide to using printf () on an STM32 via a serial (UART) wire, written for real projects (CubeIDE / HAL style). This is the most common and reliable debugging method on STM32. The Application In/Out window can interact with a running application using the Application Input/Output (App I/O) feature supported on some devices. Using this feature, data may be sent serially to and from the target application and, during runtime, over the same PGC/PGD lines used for debugging. Nov 16, 2021 · In this article, I show you how to redirect the printf output to the STM32 UART peripheral that connects to the UART pins on the embedded STLINK. It transmits to the host computer and displays via a Windows terminal program, Tera Term.
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