FATFS详细描述了FAT文件系统的C语言接口，包括FAT12，FAT16，FAT32等。-FATFS FAT file system is described in detail the C language interface, including FAT12, FAT16, FAT32 and so on.

STM32F4xx has internal SDIO peripheral to work with SD cards. Also, SDIO communication is faster than SPI, but if you don’t need speed in your project, you can use SPI aswell. With default settings, SDIO 4-bit mode communication is used. It means, th