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调试过程中断开连接

CCS6.1.3安装后,刚开始用是正常的,今天突然开始在调试程序过程中不断的断开连接,信息提示如下:

C66xx_24: JTAG Communication Error: (Error -2172 @ 0x0) Unable to communicate with the debug probe. Confirm debug probe configuration and connections, reset the debug probe, and retry the operation. (Emulation package 6.0.222.0)

不断电再次连接时,连接无法成功,报错如下:
IcePick_D: Error connecting to the target: (Error -2172 @ 0xD) Unable to communicate with the debug probe. Confirm debug probe configuration and connections, reset the debug probe, and retry the operation. (Emulation package 6.0.222.0)

请问,这种现象是什么原因?