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想测量两个方波信号（几k~几十kHZ）之间的相位差，用DSP怎么实现。可以用两个CAP模块实现吗。
用过零检测电路来将正弦波转变成方波，然後应用单片机的输入捕获工能，第一个方波开启输入捕获，第二个方波停止输入捕获，计时器内的值便是和相位有关。
这样就可以利用捕获单元了
