# arm_cfft_radix4_instance_f32 Struct Reference

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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
float32_t * | pTwiddle
uint16_t * | pBitRevTable
uint16_t | twidCoefModifier
uint16_t | bitRevFactor
float32_t | onebyfftLen

## Description

Examples:

  arm_convolution_example_f32.c, and arm_fft_bin_example_f32.c.

## Field Documentation

uint8_t arm_cfft_radix4_instance_f32::bitReverseFlag

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

Referenced by arm_cfft_radix4_f32(), and arm_cfft_radix4_init_f32().

uint16_t arm_cfft_radix4_instance_f32::bitRevFactor

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

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().

uint16_t arm_cfft_radix4_instance_f32::fftLen

length of the FFT.

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().

uint8_t arm_cfft_radix4_instance_f32::ifftFlag

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

Referenced by arm_cfft_radix4_f32(), and arm_cfft_radix4_init_f32().

float32_t arm_cfft_radix4_instance_f32::onebyfftLen

value of 1/fftLen.

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().

uint16_t* arm_cfft_radix4_instance_f32::pBitRevTable

points to the bit reversal table.

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().

float32_t* arm_cfft_radix4_instance_f32::pTwiddle

points to the twiddle factor table.

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().

uint16_t arm_cfft_radix4_instance_f32::twidCoefModifier

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

Referenced by arm_cfft_radix4_f32(), arm_cfft_radix4_init_f32(), and arm_rfft_f32().