arm_cfft_q15.c File Reference

Functions
void	arm_radix4_butterfly_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q15 CFFT butterfly process. More...
void	arm_radix4_butterfly_inverse_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef, uint32_t twidCoefModifier)
	Core function for the Q15 CIFFT butterfly process. More...
void	arm_bitreversal_16 (uint16_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
	In-place 16 bit reversal function. More...
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 Q15 complex FFT. More...

Function Documentation

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

Parameters

[in,out]	pSrc	points to in-place buffer of unknown 16-bit data type
[in]	bitRevLen	bit reversal table length
[in]	pBitRevTab	points to bit reversal table

Returns

none

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

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

end of ComplexFFT group

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