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您好，我将cli的串口改成了UARTB，我知道microB的口现在是没有UARTB_RX的，但是我打开串口调试助手发现这个串口一直往外发送cliCfg.cliPrompt字符串，请问这是什么原因？是因为UARTB_RX的状态不确定吗？
请用示波器量一下UARTB_RX管脚上是否有波形输出，看是否是板子在发送数据。
