k60-keil

来自「K60-Keil版本（下载安装MDK4.23）」· 代码 · 共 682 行 · 第 1/3 页

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};

/**   
* @brief  Initialization function for the Q31 RFFT/RIFFT.  
* @param[in, out] *S             points to an instance of the Q31 RFFT/RIFFT structure.  
* @param[in, out] *S_CFFT        points to an instance of the Q31 CFFT/CIFFT structure.  
* @param[in]      fftLenReal     length of the FFT.  
* @param[in]      ifftFlagR      flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.  
* @param[in]      bitReverseFlag flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.  
* @return		The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if <code>fftLenReal</code> is not a supported value.  
*   
* \par Description:  
* \par  
* The parameter <code>fftLenReal</code>	Specifies length of RFFT/RIFFT Process. Supported FFT Lengths are 128, 512, 2048.   
* \par   
* The parameter <code>ifftFlagR</code> controls whether a forward or inverse transform is computed.   
* Set(=1) ifftFlagR to calculate RIFFT, otherwise RFFT is calculated.   
* \par   
* The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order.   
* Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order.  
* \par   
* This function also initializes Twiddle factor table.   
*/

arm_status arm_rfft_init_q31(
  arm_rfft_instance_q31 * S,
  arm_cfft_radix4_instance_q31 * S_CFFT,
  uint32_t fftLenReal,
  uint32_t ifftFlagR,
  uint32_t bitReverseFlag)
{
  /*  Initialise the default arm status */
  arm_status status = ARM_MATH_SUCCESS;

  /*  Initialize the Real FFT length */
  S->fftLenReal = (uint16_t) fftLenReal;

  /*  Initialize the Complex FFT length */
  S->fftLenBy2 = (uint16_t) fftLenReal / 2u;

  /*  Initialize the Twiddle coefficientA pointer */
  S->pTwiddleAReal = (q31_t *) realCoefAQ31;

  /*  Initialize the Twiddle coefficientB pointer */
  S->pTwiddleBReal = (q31_t *) realCoefBQ31;

  /*  Initialize the Flag for selection of RFFT or RIFFT */
  S->ifftFlagR = (uint8_t) ifftFlagR;

  /*  Initialize the Flag for calculation Bit reversal or not */
  S->bitReverseFlagR = (uint8_t) bitReverseFlag;

  /*  Initialization of coef modifier depending on the FFT length */
  switch (S->fftLenReal)
  {
  case 512u:
    S->twidCoefRModifier = 2u;
    break;
  case 128u:
    S->twidCoefRModifier = 8u;
    break;
  default:
    /*  Reporting argument error if rfftSize is not valid value */
    status = ARM_MATH_ARGUMENT_ERROR;
    break;
  }

  /* Init Complex FFT Instance */
  S->pCfft = S_CFFT;

  if(S->ifftFlagR)
  {
    /* Initializes the CIFFT Module for fftLenreal/2 length */
    arm_cfft_radix4_init_q31(S->pCfft, (uint16_t) S->fftLenBy2, 1u, 1u);
  }
  else
  {
    /* Initializes the CFFT Module for fftLenreal/2 length */
    arm_cfft_radix4_init_q31(S->pCfft, (uint16_t) S->fftLenBy2, 0u, 1u);
  }

  /* return the status of RFFT Init function */
  return (status);

}

  /**   
   * @} end of RFFT_RIFFT group   
   */