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用TM4C129作为USB主机，枚举USB设备时，获取到设备的速度为什么是Full speed 而不是 High speed呢？TM4C129应该支持 High speed吧？
Gangyi
tm4c129是支持High Speed的，但是如果使用High Speed需要通过ULPI接口外扩外部USB PHY。 目前集成在芯片中的USB PHY仅支持FS/LS模式。
