Eli Hughes
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_rfft_instance_q31 Struct Reference
Instance structure for the Q31 RFFT/RIFFT function. More...
#include <arm_math.h>
Data Fields | |
| uint32_t | fftLenReal |
| length of the real FFT. | |
| uint32_t | fftLenBy2 |
| length of the complex FFT. | |
| uint8_t | ifftFlagR |
| flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform. | |
| uint8_t | bitReverseFlagR |
| flag that enables (bitReverseFlagR=1) or disables (bitReverseFlagR=0) bit reversal of output. | |
| uint32_t | twidCoefRModifier |
| twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. | |
| q31_t * | pTwiddleAReal |
| points to the real twiddle factor table. | |
| q31_t * | pTwiddleBReal |
| points to the imag twiddle factor table. | |
| arm_cfft_radix4_instance_q31 * | pCfft |
| points to the complex FFT instance. | |
Detailed Description
Instance structure for the Q31 RFFT/RIFFT function.
Definition at line 2234 of file arm_math.h.
Field Documentation
| uint8_t bitReverseFlagR |
flag that enables (bitReverseFlagR=1) or disables (bitReverseFlagR=0) bit reversal of output.
Definition at line 2239 of file arm_math.h.
| uint32_t fftLenBy2 |
length of the complex FFT.
Definition at line 2237 of file arm_math.h.
| uint32_t fftLenReal |
length of the real FFT.
Definition at line 2236 of file arm_math.h.
| uint8_t ifftFlagR |
flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.
Definition at line 2238 of file arm_math.h.
points to the complex FFT instance.
Definition at line 2243 of file arm_math.h.
| q31_t* pTwiddleAReal |
points to the real twiddle factor table.
Definition at line 2241 of file arm_math.h.
| q31_t* pTwiddleBReal |
points to the imag twiddle factor table.
Definition at line 2242 of file arm_math.h.
| uint32_t twidCoefRModifier |
twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Definition at line 2240 of file arm_math.h.
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