arm_cfft_q31.c File Reference

Functions
void	arm_radix4_butterfly_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CFFT butterfly process.
void	arm_radix4_butterfly_inverse_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CIFFT butterfly process.
void	arm_bitreversal_32 (uint32_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
void	arm_cfft_radix4by2_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef)
void	arm_cfft_radix4by2_inverse_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef)
void	arm_cfft_q31 (const arm_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
	Processing function for the fixed-point complex FFT in Q31 format.

Function Documentation

void arm_bitreversal_32	(	uint32_t *	pSrc,
		const uint16_t	bitRevLen,
		const uint16_t *	pBitRevTable
	)

void arm_cfft_radix4by2_inverse_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		const q31_t *	pCoef
	)

References arm_radix4_butterfly_inverse_q31(), mult_32x32_keep32_R, multAcc_32x32_keep32_R, and multSub_32x32_keep32_R.

Referenced by arm_cfft_q31().

void arm_cfft_radix4by2_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		const q31_t *	pCoef
	)

end of ComplexFFT group

References arm_radix4_butterfly_q31(), mult_32x32_keep32_R, multAcc_32x32_keep32_R, and multSub_32x32_keep32_R.

Referenced by arm_cfft_q31().

void arm_radix4_butterfly_inverse_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		q31_t *	pCoef,
		uint32_t	twidCoefModifier
	)

Parameters

[in,out]	*pSrc	points to the in-place buffer of Q31 data type.
[in]	fftLen	length of the FFT.
[in]	*pCoef	points to twiddle coefficient buffer.
[in]	twidCoefModifier	twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns

none.

References __SIMD64.

Referenced by arm_cfft_q31(), arm_cfft_radix4_q31(), and arm_cfft_radix4by2_inverse_q31().

void arm_radix4_butterfly_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		q31_t *	pCoef,
		uint32_t	twidCoefModifier
	)

end of ComplexFFT group

Parameters

[in,out]	*pSrc	points to the in-place buffer of Q31 data type.
[in]	fftLen	length of the FFT.
[in]	*pCoef	points to twiddle coefficient buffer.
[in]	twidCoefModifier	twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns

none.

References __SIMD64.

Referenced by arm_cfft_q31(), arm_cfft_radix4_q31(), and arm_cfft_radix4by2_q31().