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CMSIS DSP library

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arm_rfft_instance_q15 Struct Reference
Data Fields

arm_rfft_instance_q15 Struct Reference

Instance structure for the Q15 RFFT/RIFFT function. More...

#include <arm_math.h>

Data Fields

uint32_t fftLenReal
 length of the real 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.
q15_t * pTwiddleAReal
 points to the real twiddle factor table.
q15_t * pTwiddleBReal
 points to the imag twiddle factor table.
const arm_cfft_instance_q15 * pCfft
 points to the complex FFT instance.

Detailed Description

Instance structure for the Q15 RFFT/RIFFT function.

Definition at line 2159 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 2163 of file arm_math.h.

uint32_t fftLenReal

length of the real FFT.

Definition at line 2161 of file arm_math.h.

uint8_t ifftFlagR

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

Definition at line 2162 of file arm_math.h.

const arm_cfft_instance_q15* pCfft

points to the complex FFT instance.

Definition at line 2167 of file arm_math.h.

q15_t* pTwiddleAReal

points to the real twiddle factor table.

Definition at line 2165 of file arm_math.h.

q15_t* pTwiddleBReal

points to the imag twiddle factor table.

Definition at line 2166 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 2164 of file arm_math.h.

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