arm_cfft_radix4_q15.c File Reference

Functions
void	arm_radix4_butterfly_q15 (q15_t *pSrc16, uint32_t fftLen, const 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, const 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, const uint16_t *pBitRevTab)
	In-place Q15 bit reversal function. More...
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 *	pSrc16,
		uint32_t	fftLen,
		uint16_t	bitRevFactor,
		const uint16_t *	pBitRevTab
	)

Parameters

[in,out]	pSrc16	points to in-place Q15 data buffer
[in]	fftLen	length of FFT
[in]	bitRevFactor	bit reversal modifier that supports different size FFTs with the same bit reversal table
[in]	pBitRevTab	points to bit reversal table

Returns

none

void arm_radix4_butterfly_inverse_q15	(	q15_t *	pSrc16,
		uint32_t	fftLen,
		const 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

void arm_radix4_butterfly_q15	(	q15_t *	pSrc16,
		uint32_t	fftLen,
		const 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