CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details

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arm_cfft_radix4_instance_q31 Struct Reference

arm_cfft_radix4_instance_q31 Struct Reference

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

#include <arm_math.h>

Data Fields

uint16_t fftLen
 length of the FFT.
uint8_t ifftFlag
 flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform.
uint8_t bitReverseFlag
 flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.
q31_t * pTwiddle
 points to the twiddle factor table.
uint16_t * pBitRevTable
 points to the bit reversal table.
uint16_t twidCoefModifier
 twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
uint16_t bitRevFactor
 bit reversal modifier that supports different size FFTs with the same bit reversal table.

Detailed Description

Instance structure for the Q31 CFFT/CIFFT function.

Definition at line 1838 of file arm_math.h.


Field Documentation

uint8_t bitReverseFlag

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

Definition at line 1842 of file arm_math.h.

uint16_t bitRevFactor

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

Definition at line 1846 of file arm_math.h.

uint16_t fftLen

length of the FFT.

Definition at line 1840 of file arm_math.h.

uint8_t ifftFlag

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

Definition at line 1841 of file arm_math.h.

uint16_t* pBitRevTable

points to the bit reversal table.

Definition at line 1844 of file arm_math.h.

q31_t* pTwiddle

points to the twiddle factor table.

Definition at line 1843 of file arm_math.h.

uint16_t twidCoefModifier

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

Definition at line 1845 of file arm_math.h.