nrf_dsp_fft_i16.h

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/*
 * Copyright (c) 2026 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
#ifndef _NRF_DSP_TRANSFORM_FFT_I16_H_
#define _NRF_DSP_TRANSFORM_FFT_I16_H_
 
#include <nrf_edgeai/dsp/nrf_dsp_types.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct nrf_dsp_cfft_i16_s
{
    uint16_t        len;              
    uint16_t        bitrev_table_len; 
    const uint16_t* p_bitrev_table;   
    const int16_t*  p_twiddle;        
} nrf_dsp_cfft_i16_t;
 
typedef struct nrf_dsp_rfft_i16_s
{
    nrf_dsp_cfft_i16_t cfft;           
    uint16_t           len;            
    const int16_t*     p_twiddle_rfft; 
} nrf_dsp_rfft_i16_t;
 
typedef void (*nrf_dsp_cfft_radix_func_i16_t)(const nrf_dsp_cfft_i16_t* p_cfft, int16_t* p_input);
 
void nrf_dsp_rfft_init_i16(nrf_dsp_rfft_i16_t* p_rfft,
                           uint16_t            len,
                           const int16_t*      p_twiddle_rfft,
                           const int16_t*      p_twiddle_cfft,
                           const uint16_t*     p_bitrev_table,
                           uint16_t            bitrev_table_len);
 
void nrf_dsp_rfft_i16(const nrf_dsp_rfft_i16_t* p_rfft, int16_t* p_input, int16_t* p_output);
 
void nrf_dsp_rfft_rdx_i16(const nrf_dsp_rfft_i16_t*     p_rfft,
                          int16_t*                      p_input,
                          int16_t*                      p_output,
                          nrf_dsp_cfft_radix_func_i16_t radix_func);
 
void nrf_dsp_cfft_init_i16(nrf_dsp_cfft_i16_t* p_cfft,
                           uint16_t            len,
                           const int16_t*      p_twiddle_cfft,
                           const uint16_t*     p_bitrev_table,
                           uint16_t            bitrev_table_len);
 
void nrf_dsp_cfft_i16(const nrf_dsp_cfft_i16_t* p_cfft, int16_t* p_input, uint8_t bitreverse_flag);
 
void nrf_dsp_cfft_rdx_i16(const nrf_dsp_cfft_i16_t*     p_cfft,
                          int16_t*                      p_input,
                          uint8_t                       bitreverse_flag,
                          nrf_dsp_cfft_radix_func_i16_t radix_func);
 
void nrf_dsp_cfft_radix4_i16(const nrf_dsp_cfft_i16_t* p_cfft, int16_t* p_input);
 
void nrf_dsp_cfft_radix4by2_i16(const nrf_dsp_cfft_i16_t* p_cfft, int16_t* p_input);
 
uint16_t nrf_dsp_rfft_twiddle_factors_i16(int16_t* p_twiddle_rfft, uint16_t fft_len);
 
uint16_t nrf_dsp_cfft_twiddle_factors_i16(int16_t* p_twiddle_cfft, uint16_t fft_len);
 
#ifdef __cplusplus
}
#endif
 
#endif /* _NRF_DSP_TRANSFORM_FFT_I16_H_ */