Edge AI Add-on API 2.2.0
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◆ NRF_DSP_CFFT_TWIDDLE_COEF_256_F32

const flt32_t NRF_DSP_CFFT_TWIDDLE_COEF_256_F32[512]
Initial value:
= {
1.000000000f, 0.000000000f, 0.999698819f, 0.024541229f, 0.998795456f, 0.049067674f,
0.997290457f, 0.073564564f, 0.995184727f, 0.098017140f, 0.992479535f, 0.122410675f,
0.989176510f, 0.146730474f, 0.985277642f, 0.170961889f, 0.980785280f, 0.195090322f,
0.975702130f, 0.219101240f, 0.970031253f, 0.242980180f, 0.963776066f, 0.266712757f,
0.956940336f, 0.290284677f, 0.949528181f, 0.313681740f, 0.941544065f, 0.336889853f,
0.932992799f, 0.359895037f, 0.923879533f, 0.382683432f, 0.914209756f, 0.405241314f,
0.903989293f, 0.427555093f, 0.893224301f, 0.449611330f, 0.881921264f, 0.471396737f,
0.870086991f, 0.492898192f, 0.857728610f, 0.514102744f, 0.844853565f, 0.534997620f,
0.831469612f, 0.555570233f, 0.817584813f, 0.575808191f, 0.803207531f, 0.595699304f,
0.788346428f, 0.615231591f, 0.773010453f, 0.634393284f, 0.757208847f, 0.653172843f,
0.740951125f, 0.671558955f, 0.724247083f, 0.689540545f, 0.707106781f, 0.707106781f,
0.689540545f, 0.724247083f, 0.671558955f, 0.740951125f, 0.653172843f, 0.757208847f,
0.634393284f, 0.773010453f, 0.615231591f, 0.788346428f, 0.595699304f, 0.803207531f,
0.575808191f, 0.817584813f, 0.555570233f, 0.831469612f, 0.534997620f, 0.844853565f,
0.514102744f, 0.857728610f, 0.492898192f, 0.870086991f, 0.471396737f, 0.881921264f,
0.449611330f, 0.893224301f, 0.427555093f, 0.903989293f, 0.405241314f, 0.914209756f,
0.382683432f, 0.923879533f, 0.359895037f, 0.932992799f, 0.336889853f, 0.941544065f,
0.313681740f, 0.949528181f, 0.290284677f, 0.956940336f, 0.266712757f, 0.963776066f,
0.242980180f, 0.970031253f, 0.219101240f, 0.975702130f, 0.195090322f, 0.980785280f,
0.170961889f, 0.985277642f, 0.146730474f, 0.989176510f, 0.122410675f, 0.992479535f,
0.098017140f, 0.995184727f, 0.073564564f, 0.997290457f, 0.049067674f, 0.998795456f,
0.024541229f, 0.999698819f, 0.000000000f, 1.000000000f, -0.024541229f, 0.999698819f,
-0.049067674f, 0.998795456f, -0.073564564f, 0.997290457f, -0.098017140f, 0.995184727f,
-0.122410675f, 0.992479535f, -0.146730474f, 0.989176510f, -0.170961889f, 0.985277642f,
-0.195090322f, 0.980785280f, -0.219101240f, 0.975702130f, -0.242980180f, 0.970031253f,
-0.266712757f, 0.963776066f, -0.290284677f, 0.956940336f, -0.313681740f, 0.949528181f,
-0.336889853f, 0.941544065f, -0.359895037f, 0.932992799f, -0.382683432f, 0.923879533f,
-0.405241314f, 0.914209756f, -0.427555093f, 0.903989293f, -0.449611330f, 0.893224301f,
-0.471396737f, 0.881921264f, -0.492898192f, 0.870086991f, -0.514102744f, 0.857728610f,
-0.534997620f, 0.844853565f, -0.555570233f, 0.831469612f, -0.575808191f, 0.817584813f,
-0.595699304f, 0.803207531f, -0.615231591f, 0.788346428f, -0.634393284f, 0.773010453f,
-0.653172843f, 0.757208847f, -0.671558955f, 0.740951125f, -0.689540545f, 0.724247083f,
-0.707106781f, 0.707106781f, -0.724247083f, 0.689540545f, -0.740951125f, 0.671558955f,
-0.757208847f, 0.653172843f, -0.773010453f, 0.634393284f, -0.788346428f, 0.615231591f,
-0.803207531f, 0.595699304f, -0.817584813f, 0.575808191f, -0.831469612f, 0.555570233f,
-0.844853565f, 0.534997620f, -0.857728610f, 0.514102744f, -0.870086991f, 0.492898192f,
-0.881921264f, 0.471396737f, -0.893224301f, 0.449611330f, -0.903989293f, 0.427555093f,
-0.914209756f, 0.405241314f, -0.923879533f, 0.382683432f, -0.932992799f, 0.359895037f,
-0.941544065f, 0.336889853f, -0.949528181f, 0.313681740f, -0.956940336f, 0.290284677f,
-0.963776066f, 0.266712757f, -0.970031253f, 0.242980180f, -0.975702130f, 0.219101240f,
-0.980785280f, 0.195090322f, -0.985277642f, 0.170961889f, -0.989176510f, 0.146730474f,
-0.992479535f, 0.122410675f, -0.995184727f, 0.098017140f, -0.997290457f, 0.073564564f,
-0.998795456f, 0.049067674f, -0.999698819f, 0.024541229f, -1.000000000f, 0.000000000f,
-0.999698819f, -0.024541229f, -0.998795456f, -0.049067674f, -0.997290457f, -0.073564564f,
-0.995184727f, -0.098017140f, -0.992479535f, -0.122410675f, -0.989176510f, -0.146730474f,
-0.985277642f, -0.170961889f, -0.980785280f, -0.195090322f, -0.975702130f, -0.219101240f,
-0.970031253f, -0.242980180f, -0.963776066f, -0.266712757f, -0.956940336f, -0.290284677f,
-0.949528181f, -0.313681740f, -0.941544065f, -0.336889853f, -0.932992799f, -0.359895037f,
-0.923879533f, -0.382683432f, -0.914209756f, -0.405241314f, -0.903989293f, -0.427555093f,
-0.893224301f, -0.449611330f, -0.881921264f, -0.471396737f, -0.870086991f, -0.492898192f,
-0.857728610f, -0.514102744f, -0.844853565f, -0.534997620f, -0.831469612f, -0.555570233f,
-0.817584813f, -0.575808191f, -0.803207531f, -0.595699304f, -0.788346428f, -0.615231591f,
-0.773010453f, -0.634393284f, -0.757208847f, -0.653172843f, -0.740951125f, -0.671558955f,
-0.724247083f, -0.689540545f, -0.707106781f, -0.707106781f, -0.689540545f, -0.724247083f,
-0.671558955f, -0.740951125f, -0.653172843f, -0.757208847f, -0.634393284f, -0.773010453f,
-0.615231591f, -0.788346428f, -0.595699304f, -0.803207531f, -0.575808191f, -0.817584813f,
-0.555570233f, -0.831469612f, -0.534997620f, -0.844853565f, -0.514102744f, -0.857728610f,
-0.492898192f, -0.870086991f, -0.471396737f, -0.881921264f, -0.449611330f, -0.893224301f,
-0.427555093f, -0.903989293f, -0.405241314f, -0.914209756f, -0.382683432f, -0.923879533f,
-0.359895037f, -0.932992799f, -0.336889853f, -0.941544065f, -0.313681740f, -0.949528181f,
-0.290284677f, -0.956940336f, -0.266712757f, -0.963776066f, -0.242980180f, -0.970031253f,
-0.219101240f, -0.975702130f, -0.195090322f, -0.980785280f, -0.170961889f, -0.985277642f,
-0.146730474f, -0.989176510f, -0.122410675f, -0.992479535f, -0.098017140f, -0.995184727f,
-0.073564564f, -0.997290457f, -0.049067674f, -0.998795456f, -0.024541229f, -0.999698819f,
-0.000000000f, -1.000000000f, 0.024541229f, -0.999698819f, 0.049067674f, -0.998795456f,
0.073564564f, -0.997290457f, 0.098017140f, -0.995184727f, 0.122410675f, -0.992479535f,
0.146730474f, -0.989176510f, 0.170961889f, -0.985277642f, 0.195090322f, -0.980785280f,
0.219101240f, -0.975702130f, 0.242980180f, -0.970031253f, 0.266712757f, -0.963776066f,
0.290284677f, -0.956940336f, 0.313681740f, -0.949528181f, 0.336889853f, -0.941544065f,
0.359895037f, -0.932992799f, 0.382683432f, -0.923879533f, 0.405241314f, -0.914209756f,
0.427555093f, -0.903989293f, 0.449611330f, -0.893224301f, 0.471396737f, -0.881921264f,
0.492898192f, -0.870086991f, 0.514102744f, -0.857728610f, 0.534997620f, -0.844853565f,
0.555570233f, -0.831469612f, 0.575808191f, -0.817584813f, 0.595699304f, -0.803207531f,
0.615231591f, -0.788346428f, 0.634393284f, -0.773010453f, 0.653172843f, -0.757208847f,
0.671558955f, -0.740951125f, 0.689540545f, -0.724247083f, 0.707106781f, -0.707106781f,
0.724247083f, -0.689540545f, 0.740951125f, -0.671558955f, 0.757208847f, -0.653172843f,
0.773010453f, -0.634393284f, 0.788346428f, -0.615231591f, 0.803207531f, -0.595699304f,
0.817584813f, -0.575808191f, 0.831469612f, -0.555570233f, 0.844853565f, -0.534997620f,
0.857728610f, -0.514102744f, 0.870086991f, -0.492898192f, 0.881921264f, -0.471396737f,
0.893224301f, -0.449611330f, 0.903989293f, -0.427555093f, 0.914209756f, -0.405241314f,
0.923879533f, -0.382683432f, 0.932992799f, -0.359895037f, 0.941544065f, -0.336889853f,
0.949528181f, -0.313681740f, 0.956940336f, -0.290284677f, 0.963776066f, -0.266712757f,
0.970031253f, -0.242980180f, 0.975702130f, -0.219101240f, 0.980785280f, -0.195090322f,
0.985277642f, -0.170961889f, 0.989176510f, -0.146730474f, 0.992479535f, -0.122410675f,
0.995184727f, -0.098017140f, 0.997290457f, -0.073564564f, 0.998795456f, -0.049067674f,
0.999698819f, -0.024541229f
}
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
{
      NRF_DSP_CFFT_TWIDDLE_COEF[2*i]   = cos(i * 2*PI/(flt32_t)N);
      NRF_DSP_CFFT_TWIDDLE_COEF[2*i+1] = sin(i * 2*PI/(flt32_t)N);
}
where N = 256, PI = 3.14159265358979
Cos and Sin values are in interleaved fashion