CMSIS-DSP  Version 1.8.0
CMSIS DSP Software Library
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
arm_cfft_q31.c File Reference

Functions

void arm_radix4_butterfly_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef, uint32_t twidCoefModifier)
 Core function for the Q31 CFFT butterfly process. More...
 
void arm_radix4_butterfly_inverse_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef, uint32_t twidCoefModifier)
 Core function for the Q31 CIFFT butterfly process. More...
 
void arm_bitreversal_32 (uint32_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
 In-place 32 bit reversal function. More...
 
void arm_cfft_radix4by2_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef)
 
void arm_cfft_radix4by2_inverse_q31 (q31_t *pSrc, uint32_t fftLen, const q31_t *pCoef)
 
void arm_cfft_q31 (const arm_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Processing function for the Q31 complex FFT. More...
 

Function Documentation

void arm_bitreversal_32 ( uint32_t *  pSrc,
const uint16_t  bitRevLen,
const uint16_t *  pBitRevTab 
)
Parameters
[in,out]pSrcpoints to in-place buffer of unknown 32-bit data type
[in]bitRevLenbit reversal table length
[in]pBitRevTabpoints to bit reversal table
Returns
none
void arm_cfft_radix4by2_inverse_q31 ( q31_t pSrc,
uint32_t  fftLen,
const q31_t pCoef 
)
void arm_cfft_radix4by2_q31 ( q31_t pSrc,
uint32_t  fftLen,
const q31_t pCoef 
)

end of ComplexFFT group

void arm_radix4_butterfly_inverse_q31 ( q31_t pSrc,
uint32_t  fftLen,
const q31_t pCoef,
uint32_t  twidCoefModifier 
)
Parameters
[in,out]pSrcpoints to the in-place buffer of Q31 data type.
[in]fftLenlength of the FFT.
[in]pCoefpoints to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none
void arm_radix4_butterfly_q31 ( q31_t pSrc,
uint32_t  fftLen,
const q31_t pCoef,
uint32_t  twidCoefModifier 
)

end of ComplexFFT group

Parameters
[in,out]pSrcpoints to the in-place buffer of Q31 data type.
[in]fftLenlength of the FFT.
[in]pCoefpoints to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none