arm_cfft_radix4_q31.c File Reference

Functions
void	arm_radix4_butterfly_inverse_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CIFFT butterfly process. More...
void	arm_radix4_butterfly_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CFFT butterfly process. More...
void	arm_bitreversal_q31 (q31_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, const uint16_t *pBitRevTab)
	In-place Q31 bit reversal function. More...
void	arm_cfft_radix4_q31 (const arm_cfft_radix4_instance_q31 *S, q31_t *pSrc)
	Processing function for the Q31 CFFT/CIFFT. More...

Function Documentation

void arm_bitreversal_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		uint16_t	bitRevFactor,
		const uint16_t *	pBitRevTab
	)

Parameters

[in,out]	pSrc	points to in-place Q31 data buffer.
[in]	fftLen	length of FFT.
[in]	bitRevFactor	bit reversal modifier that supports different size FFTs with the same bit reversal table
[in]	pBitRevTab	points to bit reversal table

Returns

none

void arm_radix4_butterfly_inverse_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		const 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

void arm_radix4_butterfly_q31	(	q31_t *	pSrc,
		uint32_t	fftLen,
		const 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