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请教MSP430F5529 USB提示Unknown device

Other Parts Discussed in Thread: MSP430F5529

芯片是MSP430F5529,软件是CCS5.2.1,电路板是自己设计的,USB部分的电路与开发板USB接口电路一致,程序使用的是开发板的例程LAB4,和计算机USB通信时提示:Unknown device。

获取的USB连接状态是:ST_NOENUM_SUSPENDED

请问解决的方法是什么呢?

谢谢

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