SD.C是用S3C44BOX的SIO口读SD卡,模拟SD.C是用IO口模拟SPI口读SD卡.使用的是S3C44BOX,如果是其他MCU可以对应修改低层的SPI读写函数即可.-SD.C the SIO is S3C44BOX I read SD card, analog IO I SD.C simulation using SPI I read SD card. Using S3C44BOX, if it is the corresponding amendments to other MCU c