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在做示例usb_dev_bulk时,把USB接口换到Device ,板子有供电,但电脑没反应

我是照着 Lab7的步骤做下去的。到了把按钮从DEBUG 拨到DEVICE时 板子上的绿色LED是亮的,但是电脑没有反应,也没有提示装generic bulk device驱动什么的,设备管理器也没有出现未知设备....大佬们 ,这是怎么了. . .