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
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.
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