arm_cfft_radix4_q15.c File Reference

Functions
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. More...
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. More...
void	arm_bitreversal_q15 (q15_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, uint16_t *pBitRevTab)
void	arm_cfft_radix4_q15 (const arm_cfft_radix4_instance_q15 *S, q15_t *pSrc)
	Processing function for the Q15 CFFT/CIFFT. More...

Function Documentation

void arm_bitreversal_q15	(	q15_t *	pSrc,
		uint32_t	fftLen,
		uint16_t	bitRevFactor,
		uint16_t *	pBitRevTab
	)

Referenced by arm_cfft_radix4_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 __QADD16(), __QASX(), __QSAX(), __QSUB16(), __SHADD16(), __SHASX(), __SHSAX(), __SHSUB16(), __SIMD32, __SMUADX(), __SMUSD(), 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 __QADD16(), __QASX(), __QSAX(), __QSUB16(), __SHADD16(), __SHASX(), __SHSAX(), __SHSUB16(), __SIMD32, __SMUAD(), __SMUSDX(), and _SIMD32_OFFSET.

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