arm_cfft_q15.c File Reference

Functions
void	arm_radix4_butterfly_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q15 CFFT butterfly process.
void	arm_radix4_butterfly_inverse_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q15 CIFFT butterfly process.
void	arm_bitreversal_16 (uint16_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
void	arm_cfft_radix4by2_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef)
void	arm_cfft_radix4by2_inverse_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef)
void	arm_cfft_q15 (const arm_cfft_instance_q15 *S, q15_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
	Processing function for the floating-point complex FFT.

Function Documentation

void arm_bitreversal_16	(	uint16_t *	pSrc,
		const uint16_t	bitRevLen,
		const uint16_t *	pBitRevTable
	)

Referenced by arm_cfft_q15().

void arm_cfft_radix4by2_inverse_q15	(	q15_t *	pSrc,
		uint32_t	fftLen,
		const q15_t *	pCoef
	)

References _SIMD32_OFFSET, and arm_radix4_butterfly_inverse_q15().

Referenced by arm_cfft_q15().

void arm_cfft_radix4by2_q15	(	q15_t *	pSrc,
		uint32_t	fftLen,
		const q15_t *	pCoef
	)

end of ComplexFFT group

References _SIMD32_OFFSET, and arm_radix4_butterfly_q15().

Referenced by arm_cfft_q15().

void arm_radix4_butterfly_inverse_q15	(	q15_t *	pSrc16,
		uint32_t	fftLen,
		q15_t *	pCoef16,
		uint32_t	twidCoefModifier
	)

Parameters

[in,out]	*pSrc16	points to the in-place buffer of Q15 data type.
[in]	fftLen	length of the FFT.
[in]	*pCoef16	points to twiddle coefficient buffer.
[in]	twidCoefModifier	twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns

none.

References __SIMD32, and _SIMD32_OFFSET.

Referenced by arm_cfft_q15(), arm_cfft_radix4_q15(), and arm_cfft_radix4by2_inverse_q15().

void arm_radix4_butterfly_q15	(	q15_t *	pSrc16,
		uint32_t	fftLen,
		q15_t *	pCoef16,
		uint32_t	twidCoefModifier
	)

end of ComplexFFT group

Parameters

[in,out]	*pSrc16	points to the in-place buffer of Q15 data type.
[in]	fftLen	length of the FFT.
[in]	*pCoef16	points to twiddle coefficient buffer.
[in]	twidCoefModifier	twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns

none.

References __SIMD32, and _SIMD32_OFFSET.

Referenced by arm_cfft_q15(), arm_cfft_radix4_q15(), and arm_cfft_radix4by2_q15().