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运行 USB_dev_bulk 示例时， 电脑发现设备为USB1.0
查找了TivaWare™ USB Library USER’S GUIDE， 没发现明确的版本说明，请问该库支持USB 2.0 bulk么？谢谢！
没有人做过？
http://www.ti.com.cn/cn/lit/ug/spmu297a/spmu297a.pdf
