V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

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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 2107 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 2111 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 2115 of file arm_math.h.

uint16_t fftLen

length of the FFT.

Definition at line 2109 of file arm_math.h.

uint8_t ifftFlag

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

Definition at line 2110 of file arm_math.h.

uint16_t* pBitRevTable

points to the bit reversal table.

Definition at line 2113 of file arm_math.h.

q31_t* pTwiddle

points to the twiddle factor table.

Definition at line 2112 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 2114 of file arm_math.h.