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arm_cfft_radix4_q15.c File Reference

Functions

void arm_radix4_butterfly_q15 (q15_t *pSrc16, uint32_t fftLen, const q15_t *pCoef16, uint32_t twidCoefModifier)
 Core function for the Q15 CFFT butterfly process. More...
 
void arm_radix4_butterfly_inverse_q15 (q15_t *pSrc16, uint32_t fftLen, const q15_t *pCoef16, uint32_t twidCoefModifier)
 Core function for the Q15 CIFFT butterfly process. More...
 
void arm_bitreversal_q15 (q15_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, const uint16_t *pBitRevTab)
 In-place Q15 bit reversal function. More...
 
void arm_cfft_radix4_q15 (const arm_cfft_radix4_instance_q15 *S, q15_t *pSrc)
 Processing function for the Q15 CFFT/CIFFT. More...
 

Function Documentation

void arm_bitreversal_q15 ( q15_t pSrc16,
uint32_t  fftLen,
uint16_t  bitRevFactor,
const uint16_t *  pBitRevTab 
)
Parameters
[in,out]pSrc16points to in-place Q15 data buffer
[in]fftLenlength of FFT
[in]bitRevFactorbit reversal modifier that supports different size FFTs with the same bit reversal table
[in]pBitRevTabpoints to bit reversal table
Returns
none
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