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28377d初始化SD卡失败的问题



如题,使用的是开发板的SPI_SD例程,在sd卡创建一个文件,在初始化sd卡时失败(spi发送0xFF00,sd卡给出的响应总是0xFF00,陷入了死循环)。求教各位大佬,这个问题该怎么解决?谢谢!