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ADC采样问题,波头被反转

请问大家,我在28335做ADC采样,用graph看采样进来的波形,采样的是sine波形,但是得到却是如下波形,我用示波器看了采样电路输入到DSP的ADC口的波形时是正弦的,请问这个应该怎么解决哦,谢谢啦: