STM32是以Cortex-M3为核的处理器，该例程介绍STM32下如何对SPI进行操作。SPI适合于较长距离，高速通信。如SD，解码芯片等等。-Cortex-M3 based STM32-core processor for the routine introduction STM32 how to operate on the SPI. SPI is suitable for long distance, high-speed communications. Such as SD, deco