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由于2640上串口资源有限，尝试使用GPIO口模拟9600串口通信。经过示波器调试后发现经常会发送信号出现一定量的偏移，导致发送误码率基本在8%左右。不知道该如何去解决？
如图，1和0的间隔理论都是在112us，但是经常会出现信号的误差。
