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新手求助am3352 usb问题

Other Parts Discussed in Thread: AM3352

新手接触am3352版子,现在想在版子上通过USB连一个扫描器,但是连上后USB直接供电,这个扫描器也是常开的,我的想法是控制USB供电开关实现扫描器的开关,但是不知道怎么弄,望帮助。