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调用DSP_fft32x32



请问DSP_fft32x32具体应该怎么调用。dsp为6678,我现在是按下图所示(M=2048)来调用的,但最后计算出的A_fft中的元素都是0,这是怎么回事?还有就是调用gen_twiddle_fft32x32(int *w, int n, double scale)时的第三个参数scale是什么(我现在赋的是8,网上有人说是2147483647.5),到底应该怎么赋值?求解答!