arm_cfft_radix4_q15.c File Reference

Functions
void	arm_cfft_radix4_q15 (const arm_cfft_radix4_instance_q15 *S, q15_t *pSrc)
	Processing function for the Q15 CFFT/CIFFT.
void	arm_radix4_butterfly_q15 (q15_t *pSrc16, uint32_t fftLen, q15_t *pCoef16, uint32_t twidCoefModifier)
	Core function for the Q15 CFFT butterfly process.
void	arm_radix4_butterfly_inverse_q15 (q15_t *pSrc16, uint32_t fftLen, q15_t *pCoef16, uint32_t twidCoefModifier)
	Core function for the Q15 CIFFT butterfly process.

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Function Documentation

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_radix4_q15(), and arm_rfft_q15().

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

end of Radix4_CFFT_CIFFT 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_radix4_q15(), and arm_rfft_q15().