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F28335 ADC加上FFT计算的问题



 我设置的ADC的时钟频率为25Mhz,利用ADC对一个信号进行ADC采样,采样点数为512,然后对采样后的点(512)进行进行FFT运算,我怎样根据512个点的FFT数据计算出我的ADC采样信号的频率?