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MSP430F5529-USB-CDC 正常通讯一段时间后通讯中断

下位机用MSP430F5529-USB-CDC 模式传输数据给上位机,上位机软件采用labview编写,下位机usb部分采用的是参考设计,软件采用ccsv5。上位机给开始命令后,下位机上传数据,开始通讯正常,一段时间后,上位机接收不到数据,用bus hound监控,通讯停止后的截图如下,请教一下大家什么原因?谢谢大家