# arm_rfft_q15.c File Reference

CMSIS-DSP: arm_rfft_q15.c File Reference

| CMSIS-DSP Version 1.5.2 CMSIS DSP Software Library

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arm_rfft_q15.c File Reference

## Functions

void | arm_split_rfft_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pATable, q15_t *pBTable, q15_t *pDst, uint32_t modifier)
| Core Real FFT process. More...
void | arm_split_rifft_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pATable, q15_t *pBTable, q15_t *pDst, uint32_t modifier)
| Core Real IFFT process. More...
void | arm_rfft_q15 (const arm_rfft_instance_q15 *S, q15_t *pSrc, q15_t *pDst)
| Processing function for the Q15 RFFT/RIFFT. More...

## Function Documentation

void arm_split_rfft_q15 | ( | q15_t * | pSrc,
|  | uint32_t | fftLen,
|  | q15_t * | pATable,
|  | q15_t * | pBTable,
|  | q15_t * | pDst,
|  | uint32_t | modifier
| ) |  |

end of RealFFT group

Parameters

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

Returns
  none. The function implements a Real FFT

References __SIMD32, __SMLAD(), __SMLADX(), __SMUSD(), and __SMUSDX().

Referenced by arm_rfft_q15().

void arm_split_rifft_q15 | ( | q15_t * | pSrc,
|  | uint32_t | fftLen,
|  | q15_t * | pATable,
|  | q15_t * | pBTable,
|  | q15_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. The function implements a Real IFFT

References __PKHBT, __SIMD32, __SMLAD(), __SMLSDX(), __SMUADX(), and __SMUSD().

Referenced by arm_rfft_q15().