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关于USB底层编程的一套文章，共九篇文章，这是其中的第二篇，其它部分慢慢上传。-USB programming on the bottom of a set of articles, a total of nine articles, this is one of the second, other parts of slowly upload.

关于USB底层编程的一套文章，共九篇文章，这是其中的第三篇，其它部分慢慢上传。-USB programming on the bottom of a set of articles, a total of nine articles, this is one of the third, slowly From other parts.