基于嵌入式微处理器STM32的SD卡的驱动和文件系统的实现，全部API函数开源，没有采取函数库，全部源代码，是联系驱动编程的好例程。-Based embedded microprocessor STM32 SD card drive and file system implementations, all API functions open source, do not take the library, full source code, contact-driven programming