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两路脉冲信号有固定的相位差,通过QCPRD连续捕获4个沿信号之间的时间,4个时间的和即为一个周期的时间,问题是偶尔出现1个或者2个时间值很小,明显比其他小很多,但是数值又没有溢出的情况,导致计算出的脉冲频率不准,示波器观察也没有发现出现干扰信号。不知道问题出在哪?