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linux下无法打开串口?

系统: ubuntu 16.04

普通的ttyUSBx的串口可以正常打开,但无法打开/dev/ttyACM0,会报以下问题:

SerialException: [Errno 5] could not open port /dev/ttyACM0: [Errno 5] Input/output error: '/dev/ttyACM0'

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等待大神解答

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