arm_rfft_instance_q31 Struct Reference

Instance structure for the Q31 RFFT/RIFFT function. More...

Data Fields
uint32_t	fftLenReal
uint8_t	ifftFlagR
uint8_t	bitReverseFlagR
uint32_t	twidCoefRModifier
const q31_t *	pTwiddleAReal
const q31_t *	pTwiddleBReal
const arm_cfft_instance_q31 *	pCfft

Description

Instance structure for the Q31 RFFT/RIFFT function.

Field Documentation

bitReverseFlagR

uint8_t bitReverseFlagR

flag that enables (bitReverseFlagR=1) or disables (bitReverseFlagR=0) bit reversal of output.

fftLenReal

uint32_t fftLenReal

length of the real FFT.

ifftFlagR

uint8_t ifftFlagR

flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.

pCfft

const arm_cfft_instance_q31* pCfft

points to the complex FFT instance.

pTwiddleAReal

const q31_t* pTwiddleAReal

points to the real twiddle factor table.

pTwiddleBReal

const q31_t* pTwiddleBReal

points to the imag twiddle factor table.

twidCoefRModifier

uint32_t twidCoefRModifier

twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.