Functions
void	csky_radix4_butterfly_inverse_q31 (q31_t pSrc, uint32_t fftLen, q31_t pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CIFFT butterfly process. More...

void	csky_radix4_butterfly_q31 (q31_t pSrc, uint32_t fftLen, q31_t pCoef, uint32_t twidCoefModifier)
	Core function for the Q31 CFFT butterfly process. More...

void	csky_bitreversal_q31 (q31_t pSrc, uint32_t fftLen, uint16_t bitRevFactor, uint16_t pBitRevTab)

void	csky_cfft_radix4_q31 (const csky_cfft_radix4_instance_q31 S, q31_t pSrc)
	Processing function for the Q31 CFFT/CIFFT. More...

Function Documentation

void csky_cfft_radix4_q31	(	const csky_cfft_radix4_instance_q31 *	S,
		q31_t *	pSrc
	)

Deprecated:: Do not use this function. It has been superseded by csky_cfft_q31 and will be removed

Parameters

[in]	*S	points to an instance of the Q31 CFFT/CIFFT structure.
[in,out]	*pSrc	points to the complex data buffer of size `2*fftLen`. Processing occurs in-place.

: Internally input is downscaled by 2 for every stage to avoid saturations inside CFFT/CIFFT process. Hence the output format is different for different FFT sizes. The input and output formats for different FFT sizes and number of bits to upscale are mentioned in the tables below for CFFT and CIFFT:

void csky_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.

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.

Functions