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TMS320F2809: debug出现disconnected: unknown提示

Part Number: TMS320F2809

请问在点击 之后,出现了下图的情况,不能点击开始,且提示disconnected: unknown,无法进行进一步的调试工作,已尝试重装CCS软件(无效果),请问有什么解决方法?出现该情况的原因是什么?

PS:昨天还能正常使用,今天突然就不能正常使用了。