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TM4C129X现在的USB是1.1的，我想扩展为2.0的，外接了USB3320的PHY，我需要在程序中怎么控制呢。我已经开启了UILP模式，但是USB始终显示没有连接，无法正确枚举，终端事件为suspend，没有connect事件，求大神帮忙~~
USB 2.0 high-speed (480 Mbps) operation with the integrated ULPI interface communicating with an external PHY
TM4C129x 直接支持USB2.0的，直接用官方的例程就好了。
