然后,准备调用DSPF_sp_fftSPxSP函数,先做两个准备:第一个定义:
unsigned char brev[64] = {
0x0, 0x20, 0x10, 0x30, 0x8, 0x28, 0x18, 0x38,
0x4, 0x24, 0x14, 0x34, 0xc, 0x2c, 0x1c, 0x3c,
0x2, 0x22, 0x12, 0x32, 0xa, 0x2a, 0x1a, 0x3a,
0x6, 0x26, 0x16, 0x36, 0xe, 0x2e, 0x1e, 0x3e,
0x1, 0x21, 0x11, 0x31, 0x9, 0x29, 0x19, 0x39,
0x5, 0x25, 0x15, 0x35, 0xd, 0x2d, 0x1d, 0x3d,
0x3, 0x23, 0x13, 0x33, 0xb, 0x2b, 0x1b, 0x3b,
0x7, 0x27, 0x17, 0x37, 0xf, 0x2f, 0x1f, 0x3f
};
第二个定义:
void tw_gen (float *w, int n)
{
int i, j, k;
// const double PI = 3.141592654;
for (j = 1, k = 0; j <= n >> 2; j = j << 2)
{
for (i = 0; i < n >> 2; i += j)
{
#ifdef _LITTLE_ENDIAN
w[k] = (float) sin (2 * 3.141592654 * i / n);
w[k + 1] = (float) cos (2 * 3.141592654 * i / n);
w[k + 2] = (float) sin (4 * 3.141592654 * i / n);
w[k + 3] = (float) cos (4 * 3.141592654 * i / n);
w[k + 4] = (float) sin (6 * 3.141592654 * i / n);
w[k + 5] = (float) cos (6 * 3.141592654 * i / n);
#else
w[k] = (float) cos (2 * 3.141592654 * i / n);
w[k + 1] = (float) -sin (2 * 3.141592654 * i / n);
w[k + 2] = (float) cos (4 * 3.141592654 * i / n);
w[k + 3] = (float) -sin (4 * 3.141592654 * i / n);
w[k + 4] = (float) cos (6 * 3.141592654 * i / n);
w[k + 5] = (float) -sin (6 * 3.141592654 * i / n);
#endif
k += 6;
}
}
}
最后,在主函数中包含头文件#include <ti/dsplib/src/DSPF_sp_fftSPxSP/DSPF_sp_fftSPxSP.h>,之后在主函数里直接调用
tw_gen(Wn,16384);//产生旋转因子
DSPF_sp_fftSPxSP(16384,x_sp,Wn,y_sp,brev,2,0,16384);//调用函数
问题:旋转因子可以正常产生,但是函数DSPF_sp_fftSPxSP执行不了,请问问题出现在哪?