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求解！最近在am335x上运行vxWorks代码，打开USB模块，将USB0设置为HOST模式，外接HUB芯片 + U转串，发现功能异常。HOST与EP 0x81通信时，URB Request发送两次后，新的请求提交失败，而Host与EP 0 urb 请求可以正常提交。
