Modules
	Complex FFT Tables
Functions
void	arm_cfft_q15 (const arm_cfft_instance_q15 S, q15_t p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
	Processing function for the Q15 complex FFT.
void	arm_cfft_radix4_q15 (const arm_cfft_radix4_instance_q15 S, q15_t pSrc)
	Processing function for the Q15 CFFT/CIFFT.

Function Documentation

Processing function for the Q15 complex FFT.

Parameters:

[in]	*S	points to an instance of the Q15 CFFT structure.
[in,out]	*p1	points to the complex data buffer of size `2*fftLen`. Processing occurs in-place.
[in]	ifftFlag	flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform.
[in]	bitReverseFlag	flag that enables (bitReverseFlag=1) or disables (bitReverseFlag=0) bit reversal of output.

Definition at line 77 of file arm_cfft_q15.c.

void arm_cfft_radix4_q15	(	const arm_cfft_radix4_instance_q15 *	S,
		q15_t *	pSrc
	)

Processing function for the Q15 CFFT/CIFFT.

Parameters:

[in]	*S	points to an instance of the Q15 CFFT/CIFFT structure.
[in,out]	*pSrc	points to the complex data buffer. Processing occurs in-place.

: Internally input is downscaled by 2 for every stage to avoid saturations inside CFFT/CIFFT process. Hence the output format is different for different FFT sizes. The input and output formats for different FFT sizes and number of bits to upscale are mentioned in the tables below for CFFT and CIFFT:

: Input and Output Formats for Q15 CFFT

Input and Output Formats for Q15 CIFFT

Definition at line 79 of file arm_cfft_radix4_q15.c.

ComplexFFT
[Transform Functions]