arm_rfft_instance_f32 Struct Reference

Instance structure for the floating-point RFFT/RIFFT function.

Data Fields
uint32_t	fftLenReal
uint16_t	fftLenBy2
uint8_t	ifftFlagR
uint8_t	bitReverseFlagR
uint32_t	twidCoefRModifier
const float32_t *	pTwiddleAReal
const float32_t *	pTwiddleBReal
arm_cfft_radix4_instance_f32 *	pCfft

Field Documentation

uint8_t bitReverseFlagR

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

uint16_t fftLenBy2

length of the complex FFT.

uint32_t fftLenReal

length of the real FFT.

uint8_t ifftFlagR

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

arm_cfft_radix4_instance_f32* pCfft

points to the complex FFT instance.

const float32_t* pTwiddleAReal

points to the real twiddle factor table.

const float32_t* pTwiddleBReal

points to the imag twiddle factor table.

uint32_t twidCoefRModifier

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