Code to access MMC/SD cards with FAT16/FAT32 file system on an Atmel AVR8. Code contains SDHC support (disabled)

单片机读写SD/MMC卡文件，实现大容量存储，支持FAT16/32，有高级函数接口，便于二次开发，提供所有C51源代码。 -SCM reader SD/MMC card file, mass storage support FAT16/32, high-function interface for secondary development, providing all the source code C51.