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arm_cfft_radix2_instance_q31 Struct Reference

Instance structure for the Radix-2 Q31 CFFT/CIFFT function.

Data Fields

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

Field Documentation

uint8_t bitReverseFlag

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

uint16_t bitRevFactor

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

uint16_t fftLen

length of the FFT.

uint8_t ifftFlag

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

const uint16_t* pBitRevTable

points to the bit reversal table.

const q31_t* pTwiddle

points to the Twiddle factor table.

uint16_t twidCoefModifier

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