Functions
csky_status	csky_cfft_radix2_init_q15 (csky_cfft_radix2_instance_q15 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
	Initialization function for the Q15 CFFT/CIFFT. More...

Function Documentation

csky_status csky_cfft_radix2_init_q15	(	csky_cfft_radix2_instance_q15 *	S,
		uint16_t	fftLen,
		uint8_t	ifftFlag,
		uint8_t	bitReverseFlag
	)

Deprecated:: Do not use this function. It has been superseded by csky_cfft_q15 and will be removed

Parameters

[in,out]	*S	points to an instance of the Q15 CFFT/CIFFT structure.
[in]	fftLen	length of the FFT.
[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.

Returns: The function returns CSKY_MATH_SUCCESS if initialization is successful or CSKY_MATH_ARGUMENT_ERROR if fftLen is not a supported value.

: The parameter ifftFlag controls whether a forward or inverse transform is computed. Set(=1) ifftFlag for calculation of CIFFT otherwise CFFT is calculated

: The parameter bitReverseFlag controls whether output is in normal order or bit reversed order. Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order.

: The parameter fftLen Specifies length of CFFT/CIFFT process. Supported FFT Lengths are 16, 64, 256, 1024.

: This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.

Functions