arm_cfft_q31.c File Reference

Functions
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_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_bitreversal_32 (uint32_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
	In-place 32 bit reversal function. More...
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 Q31 complex FFT. More...

Function Documentation

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

Parameters

[in,out]	pSrc	points to in-place buffer of unknown 32-bit data type
[in]	bitRevLen	bit reversal table length
[in]	pBitRevTab	points to bit reversal table

Returns

none

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

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

end of ComplexFFT group

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