# arm_rfft_instance_q31 Struct Reference

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

`#include <arm_math.h>`

## Data Fields

uint32_t | fftLenReal
uint32_t | fftLenBy2
uint8_t | ifftFlagR
uint8_t | bitReverseFlagR
uint32_t | twidCoefRModifier
q31_t * | pTwiddleAReal
q31_t * | pTwiddleBReal
arm_cfft_radix4_instance_q31 * | pCfft

## Detailed Description

Instance structure for the Q31 RFFT/RIFFT function.

Definition at line 2172 of file arm_math.h.

## Field Documentation

uint32_t arm_rfft_instance_q31::fftLenReal

length of the real FFT.

Definition at line 2174 of file arm_math.h.

uint32_t arm_rfft_instance_q31::fftLenBy2

length of the complex FFT.

Definition at line 2175 of file arm_math.h.

uint8_t arm_rfft_instance_q31::ifftFlagR

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

Definition at line 2176 of file arm_math.h.

uint8_t arm_rfft_instance_q31::bitReverseFlagR

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

Definition at line 2177 of file arm_math.h.

uint32_t arm_rfft_instance_q31::twidCoefRModifier

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

Definition at line 2178 of file arm_math.h.

q31_t* arm_rfft_instance_q31::pTwiddleAReal

points to the real twiddle factor table.

Definition at line 2179 of file arm_math.h.

q31_t* arm_rfft_instance_q31::pTwiddleBReal

points to the imag twiddle factor table.

Definition at line 2180 of file arm_math.h.

arm_cfft_radix4_instance_q31* arm_rfft_instance_q31::pCfft

points to the complex FFT instance.

Definition at line 2181 of file arm_math.h.

The documentation for this struct was generated from the following file:

- arm_math.h

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