CMSIS-DSP  
CMSIS DSP Software Library
arm_cfft_radix4_instance_f32 Struct Reference

Instance structure for the floating-point CFFT/CIFFT function. More...

Data Fields

uint16_t fftLen
 
uint8_t ifftFlag
 
uint8_t bitReverseFlag
 
const float32_tpTwiddle
 
const uint16_t * pBitRevTable
 
uint16_t twidCoefModifier
 
uint16_t bitRevFactor
 
float32_t onebyfftLen
 

Description

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.

◆ onebyfftLen

float32_t onebyfftLen

value of 1/fftLen.

◆ pBitRevTable

const uint16_t* pBitRevTable

points to the bit reversal table.

◆ pTwiddle

const float32_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.