arm_cfft_radix4_instance_q31 Struct Reference

Instance structure for the Q31 CFFT/CIFFT function.

Data Fields
uint16_t	fftLen
uint8_t	ifftFlag
uint8_t	bitReverseFlag
const q31_t *	pTwiddle
const uint16_t *	pBitRevTable
uint16_t	twidCoefModifier
uint16_t	bitRevFactor

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.