CMSIS-DSP  
CMSIS DSP Software Library
 
Loading...
Searching...
No Matches
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_tpTwiddleAReal
 
const q31_tpTwiddleBReal
 
const arm_cfft_instance_q31pCfft
 

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.