k60-keil

K60-Keil版本（下载安装MDK4.23）

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/**   
* @brief  Initialization function for the floating-point CFFT/CIFFT.  
* @param[in,out] *S             points to an instance of the floating-point CFFT/CIFFT structure.  
* @param[in]     fftLen         length of the FFT.  
* @param[in]     ifftFlag       flag that selects forward (ifftFlag=0) or inverse (ifftFlag=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>fftLen</code> is not a supported value.  
*   
* \par Description:  
* \par   
* The parameter <code>ifftFlag</code> controls whether a forward or inverse transform is computed.   
* Set(=1) ifftFlag for calculation of CIFFT otherwise  CFFT 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   
* The parameter <code>fftLen</code>	Specifies length of CFFT/CIFFT process. Supported FFT Lengths are 16, 64, 256, 1024.   
* \par   
* This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.   
*/

arm_status arm_cfft_radix4_init_f32(
  arm_cfft_radix4_instance_f32 * S,
  uint16_t fftLen,
  uint8_t ifftFlag,
  uint8_t bitReverseFlag)
{
  /*  Initialise the default arm status */
  arm_status status = ARM_MATH_SUCCESS;

  /*  Initialise the FFT length */
  S->fftLen = fftLen;

  /*  Initialise the Twiddle coefficient pointer */
  S->pTwiddle = (float32_t *) twiddleCoef;

  /*  Initialise the Flag for selection of CFFT or CIFFT */
  S->ifftFlag = ifftFlag;

  /*  Initialise the Flag for calculation Bit reversal or not */
  S->bitReverseFlag = bitReverseFlag;

  /*  Initializations of structure parameters depending on the FFT length */
  switch (S->fftLen)
  {

  case 1024u:
    /*  Initializations of structure parameters for 1024 point FFT */

    /*  Initialise the twiddle coef modifier value */
    S->twidCoefModifier = 1u;
    /*  Initialise the bit reversal table modifier */
    S->bitRevFactor = 1u;
    /*  Initialise the bit reversal table pointer */
    S->pBitRevTable = armBitRevTable;
    /*  Initialise the 1/fftLen Value */
    S->onebyfftLen = 0.0009765625f;
    break;


  case 256u:
    /*  Initializations of structure parameters for 256 point FFT */
    S->twidCoefModifier = 4u;
    S->bitRevFactor = 4u;
    S->pBitRevTable = &armBitRevTable[3];
    S->onebyfftLen = 0.00390625f;
    break;

  case 64u:
    /*  Initializations of structure parameters for 64 point FFT */
    S->twidCoefModifier = 16u;
    S->bitRevFactor = 16u;
    S->pBitRevTable = &armBitRevTable[15];
    S->onebyfftLen = 0.015625f;
    break;

  case 16u:
    /*  Initializations of structure parameters for 16 point FFT */
    S->twidCoefModifier = 64u;
    S->bitRevFactor = 64u;
    S->pBitRevTable = &armBitRevTable[63];
    S->onebyfftLen = 0.0625f;
    break;


  default:
    /*  Reporting argument error if fftSize is not valid value */
    status = ARM_MATH_ARGUMENT_ERROR;
    break;
  }

  return (status);
}

/**   
 * @} end of CFFT_CIFFT group   
 */