基于STM32的，通过USB读SD卡程序。相当制作了一个SD读卡器。内有USB及SD卡读写程序等。完整工程。keil MDK3.22A以上打开-Based on the STM32, the SD card via USB reading program. Rather produced a SD card reader. There are USB and SD card reading and writing procedures. Complete works. keil MDK3.22A