CMSIS-DSP  Version 1.8.0
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arm_rfft_instance_q15 Struct Reference

Instance structure for the Q15 RFFT/RIFFT function.

Data Fields

uint32_t fftLenReal
 
uint8_t ifftFlagR
 
uint8_t bitReverseFlagR
 
uint32_t twidCoefRModifier
 
const q15_tpTwiddleAReal
 
const q15_tpTwiddleBReal
 
const arm_cfft_instance_q15pCfft
 

Field Documentation

uint8_t arm_rfft_instance_q15::bitReverseFlagR

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

uint32_t arm_rfft_instance_q15::fftLenReal

length of the real FFT.

uint8_t arm_rfft_instance_q15::ifftFlagR

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

const arm_cfft_instance_q15* arm_rfft_instance_q15::pCfft

points to the complex FFT instance.

const q15_t* arm_rfft_instance_q15::pTwiddleAReal

points to the real twiddle factor table.

const q15_t* arm_rfft_instance_q15::pTwiddleBReal

points to the imag twiddle factor table.

uint32_t arm_rfft_instance_q15::twidCoefRModifier

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