SD卡调试已成功，上传我的经验

调试关键点： 上电时要延时足够长的时间给SD卡一个准备过程，在我的程序里是5秒，根据不同的卡设置不同的延时时间。SD卡初始化第一步在发送CMD命令之前，在片选有效的情-SD card commissioning has been successfully uploaded my experience debugging the key point: the power to delay long enough time to the process of preparing a SD card in my program there is 5 seconds, depending on the card to set a different delay time. SD card initialization step before sending the CMD command, chip select valid in the situation