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我想用TM4C129芯片来做usb通讯,TM4C129作为主机,与之连接的设备的类型为HUB,现在想让它们可以类似于串口一样进行通信,例如主机发送一个命令,HUB从机就回复一个特定报文。我看官方例程只有键盘、鼠标、U盘这类例程,没有hub的,如果用官方库函数的话需要怎么样的配置流程?