在stm32f107上移植了Fatfs文件系统来访问SD卡，SD卡与CPU通过SPI接口连接，传输采用了DMA，可以快速读写文件-In stm32f107 on the transplant Fatfs file system to access the SD card, SD card connected to the CPU via the SPI interface, the transmission uses a DMA, you can quickly read and write f