text: #include "edge-impulse-sdk/dsp/config.hpp"
  #if EIDSP_LOAD_CMSIS_DSP_SOURCES
  /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_rfft_fast_init_f32.c
   * Description:  Split Radix Decimation in Frequency CFFT Floating point processing function
   *
   * $Date:        18. March 2019
   * $Revision:    V1.6.0
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the License); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include "edge-impulse-sdk/CMSIS/DSP/Include/dsp/transform_functions.h"
  #include "edge-impulse-sdk/CMSIS/DSP/Include/arm_common_tables.h"
  
  /**
    @ingroup groupTransforms
   */
  
  /**
    @addtogroup RealFFT
    @{
   */
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_16) && defined(ARM_TABLE_BITREVIDX_FLT_16) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_32))
  
  /**
    @private
    @brief         Initialization function for the 32pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_32_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),16);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
  
    S->fftLenRFFT = 32U;
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_32;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_32) && defined(ARM_TABLE_BITREVIDX_FLT_32) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_64))
  
  /**
    @private
    @brief         Initialization function for the 64pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_64_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),32);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 64U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_64;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_64) && defined(ARM_TABLE_BITREVIDX_FLT_64) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_128))
  
  /**
    @private
    @brief         Initialization function for the 128pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_128_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),64);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 128;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_128;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_128) && defined(ARM_TABLE_BITREVIDX_FLT_128) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_256))
  
  /**
    @private
    @brief         Initialization function for the 256pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
  */
  
  static arm_status arm_rfft_256_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),128);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 256U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_256;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_256) && defined(ARM_TABLE_BITREVIDX_FLT_256) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_512))
  
  /**
    @private
    @brief         Initialization function for the 512pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_512_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),256);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 512U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_512;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_512) && defined(ARM_TABLE_BITREVIDX_FLT_512) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_1024))
  /**
    @private
    @brief         Initialization function for the 1024pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_1024_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),512);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 1024U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_1024;
  
    return ARM_MATH_SUCCESS;
  }
  #endif
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_1024) && defined(ARM_TABLE_BITREVIDX_FLT_1024) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_2048))
  /**
    @private
    @brief         Initialization function for the 2048pt floating-point real FFT.
    @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  static arm_status arm_rfft_2048_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),1024);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 2048U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_2048;
  
    return ARM_MATH_SUCCESS;
  }
  #endif
  
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_2048) && defined(ARM_TABLE_BITREVIDX_FLT_2048) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_4096))
  /**
    @private
  * @brief         Initialization function for the 4096pt floating-point real FFT.
  * @param[in,out] S  points to an arm_rfft_fast_instance_f32 structure
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : an error is detected
   */
  
  static arm_status arm_rfft_4096_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
  
    arm_status status;
  
    if( !S ) return ARM_MATH_ARGUMENT_ERROR;
  
    status=arm_cfft_init_f32(&(S->Sint),2048);
    if (status != ARM_MATH_SUCCESS)
    {
      return(status);
    }
    S->fftLenRFFT = 4096U;
  
    S->pTwiddleRFFT    = (float32_t *) twiddleCoef_rfft_4096;
  
    return ARM_MATH_SUCCESS;
  }
  #endif 
  
  /**
    @brief         Initialization function for the floating-point real FFT.
    @param[in,out] S       points to an arm_rfft_fast_instance_f32 structure
    @param[in]     fftLen  length of the Real Sequence
    @return        execution status
                     - \ref ARM_MATH_SUCCESS        : Operation successful
                     - \ref ARM_MATH_ARGUMENT_ERROR : <code>fftLen</code> is not a supported length
  
    @par           Description
                     The parameter <code>fftLen</code> specifies the length of RFFT/CIFFT process.
                     Supported FFT Lengths are 32, 64, 128, 256, 512, 1024, 2048, 4096.
    @par
                     This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.
   */
  
  arm_status arm_rfft_fast_init_f32(
    arm_rfft_fast_instance_f32 * S,
    uint16_t fftLen)
  {
    typedef arm_status(*fft_init_ptr)( arm_rfft_fast_instance_f32 *);
    fft_init_ptr fptr = 0x0;
  
    switch (fftLen)
    {
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_2048) && defined(ARM_TABLE_BITREVIDX_FLT_2048) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_4096))
    case 4096U:
      fptr = arm_rfft_4096_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_1024) && defined(ARM_TABLE_BITREVIDX_FLT_1024) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_2048))
    case 2048U:
      fptr = arm_rfft_2048_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_512) && defined(ARM_TABLE_BITREVIDX_FLT_512) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_1024))
    case 1024U:
      fptr = arm_rfft_1024_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_256) && defined(ARM_TABLE_BITREVIDX_FLT_256) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_512))
    case 512U:
      fptr = arm_rfft_512_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_128) && defined(ARM_TABLE_BITREVIDX_FLT_128) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_256))
    case 256U:
      fptr = arm_rfft_256_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_64) && defined(ARM_TABLE_BITREVIDX_FLT_64) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_128))
    case 128U:
      fptr = arm_rfft_128_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_32) && defined(ARM_TABLE_BITREVIDX_FLT_32) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_64))
    case 64U:
      fptr = arm_rfft_64_fast_init_f32;
      break;
  #endif
  #if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_F32_16) && defined(ARM_TABLE_BITREVIDX_FLT_16) && defined(ARM_TABLE_TWIDDLECOEF_RFFT_F32_32))
    case 32U:
      fptr = arm_rfft_32_fast_init_f32;
      break;
  #endif
    default:
      return ARM_MATH_ARGUMENT_ERROR;
    }
  
    if( ! fptr ) return ARM_MATH_ARGUMENT_ERROR;
    return fptr( S );
  
  }
  
  /**
    @} end of RealFFT group
   */
  
  #endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
  