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想测试一下自发自收：
往串口写数据到PA1(TX),用示波器量了正常，然后用杜邦线短接到PA0(RX),便进入循环了.
是遇到问题了，才去尝试最基本的自发自收，连接别的模块时，TX低电平没有拉到0.5以后，看图：
