This book adheres to the concept of “New Engineering” and comprehensively and systematically covers the principles and applications of embedded systems based on STM32F103, starting from research, teaching, and practical engineering applications. The book consists of 12 chapters, which mainly cover the introduction, embedded microprocessors, STM32 series microcontrollers, the setup of embedded development environments, STM32 interrupts, STM32 GPIO, STM32 timers, STM32 universal synchronous/asynchronous receivers and transmitters, STM32 SPI serial bus, STM32 I2C serial bus, STM32 A/D converters, and STM32 DMA controllers. The content of the book is rich, with advanced systems and reasonable structures, integrating theory with practice, and paying particular attention to engineering application techniques.