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利用DSPF_sp_fftSPXSP函数进行FFT之后的结果与MATLAB中的不一样

TI工程师您好,我的板子是C6678,利用DSPF_sp_fftSPXSP函数进行FFT之后的结果与MATLAB的仿真结果不一样,请问是什么可能原因导致的呢?