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arm_rfft_instance_q31 Struct Reference

Instance structure for the Q31 RFFT/RIFFT function.

Data Fields

uint32_t fftLenReal
uint8_t ifftFlagR
uint8_t bitReverseFlagR
uint32_t twidCoefRModifier
const q31_tpTwiddleAReal
const q31_tpTwiddleBReal
const arm_cfft_instance_q31pCfft

Field Documentation

uint8_t arm_rfft_instance_q31::bitReverseFlagR

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

uint32_t arm_rfft_instance_q31::fftLenReal

length of the real FFT.

uint8_t arm_rfft_instance_q31::ifftFlagR

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

const arm_cfft_instance_q31* arm_rfft_instance_q31::pCfft

points to the complex FFT instance.

const q31_t* arm_rfft_instance_q31::pTwiddleAReal

points to the real twiddle factor table.

const q31_t* arm_rfft_instance_q31::pTwiddleBReal

points to the imag twiddle factor table.

uint32_t arm_rfft_instance_q31::twidCoefRModifier

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