# arm_rfft_f32.c File Reference

CMSIS-DSP: arm_rfft_f32.c File Reference

| CMSIS-DSP Version 1.5.2 CMSIS DSP Software Library

- Main Page
- Usage and Description
- Reference

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Functions
arm_rfft_f32.c File Reference

## Functions

void | arm_radix4_butterfly_f32 (float32_t *pSrc, uint16_t fftLen, float32_t *pCoef, uint16_t twidCoefModifier)
void | arm_radix4_butterfly_inverse_f32 (float32_t *pSrc, uint16_t fftLen, float32_t *pCoef, uint16_t twidCoefModifier, float32_t onebyfftLen)
void | arm_bitreversal_f32 (float32_t *pSrc, uint16_t fftSize, uint16_t bitRevFactor, uint16_t *pBitRevTab)
void | arm_split_rfft_f32 (float32_t *pSrc, uint32_t fftLen, float32_t *pATable, float32_t *pBTable, float32_t *pDst, uint32_t modifier)
| Core Real FFT process. More...
void | arm_split_rifft_f32 (float32_t *pSrc, uint32_t fftLen, float32_t *pATable, float32_t *pBTable, float32_t *pDst, uint32_t modifier)
| Core Real IFFT process. More...
void | arm_rfft_f32 (const arm_rfft_instance_f32 *S, float32_t *pSrc, float32_t *pDst)
| Processing function for the floating-point RFFT/RIFFT. More...

## Function Documentation

void arm_bitreversal_f32 | ( | float32_t * | pSrc,
|  | uint16_t | fftSize,
|  | uint16_t | bitRevFactor,
|  | uint16_t * | pBitRevTab
| ) |  |

Referenced by arm_rfft_f32().

void arm_radix4_butterfly_f32 | ( | float32_t * | pSrc,
|  | uint16_t | fftLen,
|  | float32_t * | pCoef,
|  | uint16_t | twidCoefModifier
| ) |  |

end of ComplexFFT group

Referenced by arm_cfft_radix4_f32(), and arm_rfft_f32().

void arm_radix4_butterfly_inverse_f32 | ( | float32_t * | pSrc,
|  | uint16_t | fftLen,
|  | float32_t * | pCoef,
|  | uint16_t | twidCoefModifier,
|  | float32_t | onebyfftLen
| ) |  |

Referenced by arm_cfft_radix4_f32(), and arm_rfft_f32().

void arm_split_rfft_f32 | ( | float32_t * | pSrc,
|  | uint32_t | fftLen,
|  | float32_t * | pATable,
|  | float32_t * | pBTable,
|  | float32_t * | pDst,
|  | uint32_t | modifier
| ) |  |

end of RealFFT group

Parameters

  [in] | *pSrc | points to the input buffer.
  [in] | fftLen | length of FFT.
  [in] | *pATable | points to the twiddle Coef A buffer.
  [in] | *pBTable | points to the twiddle Coef B buffer.
  [out] | *pDst | points to the output buffer.
  [in] | modifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

Referenced by arm_rfft_f32().

void arm_split_rifft_f32 | ( | float32_t * | pSrc,
|  | uint32_t | fftLen,
|  | float32_t * | pATable,
|  | float32_t * | pBTable,
|  | float32_t * | pDst,
|  | uint32_t | modifier
| ) |  |

Parameters

  [in] | *pSrc | points to the input buffer.
  [in] | fftLen | length of FFT.
  [in] | *pATable | points to the twiddle Coef A buffer.
  [in] | *pBTable | points to the twiddle Coef B buffer.
  [out] | *pDst | points to the output buffer.
  [in] | modifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

Referenced by arm_rfft_f32().