基于STC12系列单片机的2G以内SD卡驱动及FAT32 文件系统访问代码。通过STC12单片机的SPI功能实现了SD卡的扇区读取，实现对SD卡内短文件名文件的访问，实现通过串口传输SD卡文件。-Based STC12 Series MCU within 2G SD card driver and the FAT32 file system access code. By STC12 SPI function in the sector to achieve a SD card reader,