The STM32F103 microcontroller has several features that make it suitable for a wide range of embedded system applications.
Also download AN2606 (Application note for bootloader). This tells you exactly how to enter DFU mode using the BOOT0 and BOOT1 pins. If you brick your Blue Pill, this PDF saves you. the stm32f103 arm microcontroller and embedded systems pdf
From the reference manual (RM0008 – Chapter 8: General-purpose I/O), you learn to configure GPIO Pin PC13: The STM32F103 microcontroller has several features that make
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