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arm_cfft_radix4_instance_q31 Struct Reference

Instance structure for the Q31 CFFT/CIFFT function. More...

Data Fields

uint16_t fftLen
 
uint8_t ifftFlag
 
uint8_t bitReverseFlag
 
const q31_tpTwiddle
 
const uint16_t * pBitRevTable
 
uint16_t twidCoefModifier
 
uint16_t bitRevFactor
 

Description

Instance structure for the Q31 CFFT/CIFFT function.

Field Documentation

◆ bitReverseFlag

uint8_t bitReverseFlag

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

◆ bitRevFactor

uint16_t bitRevFactor

bit reversal modifier that supports different size FFTs with the same bit reversal table.

◆ fftLen

uint16_t fftLen

length of the FFT.

◆ ifftFlag

uint8_t ifftFlag

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

◆ pBitRevTable

const uint16_t* pBitRevTable

points to the bit reversal table.

◆ pTwiddle

const q31_t* pTwiddle

points to the twiddle factor table.

◆ twidCoefModifier

uint16_t twidCoefModifier

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