nrf_dsp_rfft_twiddle_factors_i16()

uint16_t nrf_dsp_rfft_twiddle_factors_i16	(	int16_t *	p_twiddle_rfft,
		uint16_t	fft_len )

#include <include/nrf_edgeai/dsp/transform/fft/nrf_dsp_fft_i16.h>

Generate fixed-point 16 bit real twiddle factors buffer:

Parameters

[out]	p_twiddle_rfft	Output real twiddle factors buffer, the output buffer should be fft_len in length
[in]	fft_len	FFT length for which twiddle factors table will be generated, should be in power of 2

Returns

Number of twiddle factors in the output buffer, if fft_len is not power of 2, returns 0