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arm_cfft_q15.c File Reference

Functions

void arm_radix4_butterfly_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef, uint32_t twidCoefModifier)
 Core function for the Q15 CFFT butterfly process. More...
 
void arm_radix4_butterfly_inverse_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef, uint32_t twidCoefModifier)
 Core function for the Q15 CIFFT butterfly process. More...
 
void arm_bitreversal_16 (uint16_t *pSrc, const uint16_t bitRevLen, const uint16_t *pBitRevTable)
 In-place 16 bit reversal function. More...
 
void arm_cfft_radix4by2_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef)
 
void arm_cfft_radix4by2_inverse_q15 (q15_t *pSrc, uint32_t fftLen, const q15_t *pCoef)
 
void arm_cfft_q15 (const arm_cfft_instance_q15 *S, q15_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Processing function for Q15 complex FFT. More...
 

Function Documentation

void arm_bitreversal_16 ( uint16_t *  pSrc,
const uint16_t  bitRevLen,
const uint16_t *  pBitRevTab 
)
Parameters
[in,out]pSrcpoints to in-place buffer of unknown 16-bit data type
[in]bitRevLenbit reversal table length
[in]pBitRevTabpoints to bit reversal table
Returns
none
void arm_cfft_radix4by2_inverse_q15 ( q15_t pSrc,
uint32_t  fftLen,
const q15_t pCoef 
)
void arm_cfft_radix4by2_q15 ( q15_t pSrc,
uint32_t  fftLen,
const q15_t pCoef 
)

end of ComplexFFT group

void arm_radix4_butterfly_inverse_q15 ( q15_t pSrc16,
uint32_t  fftLen,
const q15_t pCoef16,
uint32_t  twidCoefModifier 
)
Parameters
[in,out]pSrc16points to the in-place buffer of Q15 data type
[in]fftLenlength of the FFT
[in]pCoef16points 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_q15 ( q15_t pSrc16,
uint32_t  fftLen,
const q15_t pCoef16,
uint32_t  twidCoefModifier 
)

end of ComplexFFT group

Parameters
[in,out]pSrc16points to the in-place buffer of Q15 data type
[in]fftLenlength of the FFT
[in]pCoef16points to twiddle coefficient buffer
[in]twidCoefModifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table
Returns
none