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用Epwm产生波形有毛刺



我用Epwm模块产生方波,用示波器观察,发现有毛刺

用Agilent  DSO-x 2024A型示波器得到波形:


 然后用RIGOL  DS1104示波器观察得到波形:

会发现波形都有毛刺, 然后我不用Epwm模块,直接把引脚配置为GPIO,通过引脚置1清0产生方波,发现也有毛刺

如图:

硬件我是用的网上买的开发板。这该怎么解决啊,到底是什么问题啊,请大神提点!