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如上,这是两条cmd命令。第一条可以正常运行,第二条包括之后的任何命令都无法运行。 判断命令运行与否是轮询SMHC_RINTSTS寄存器 失败原因永远是i加到了100,依然没有出现#define SDXC_COMMAND_DONE (1 << 2)被置位的情况。
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