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过零点检测问题



要对一个类似于正弦波的信号,我要找到它的过零点,用C2000系列的芯片不知道有没有最简洁的方法,我能想到的有:

1.ADC采样分析;

2.再就是用硬件将其整成方波,再用eCAP捕获;

不知道还有没有其他又简洁又方便的方法,求各位大神讲解??