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CMSIS DSP Software Library
 
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Deprecated Complex FFT functions

Functions

void arm_cfft_radix2_f16 (const arm_cfft_radix2_instance_f16 *S, float16_t *pSrc)
 Radix-2 CFFT/CIFFT.
 
void arm_cfft_radix2_f32 (const arm_cfft_radix2_instance_f32 *S, float32_t *pSrc)
 Radix-2 CFFT/CIFFT.
 
arm_status arm_cfft_radix2_init_f16 (arm_cfft_radix2_instance_f16 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the floating-point CFFT/CIFFT.
 
arm_status arm_cfft_radix2_init_f32 (arm_cfft_radix2_instance_f32 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the floating-point CFFT/CIFFT.
 
arm_status arm_cfft_radix2_init_q15 (arm_cfft_radix2_instance_q15 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the Q15 CFFT/CIFFT.
 
arm_status arm_cfft_radix2_init_q31 (arm_cfft_radix2_instance_q31 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the Q31 CFFT/CIFFT.
 
void arm_cfft_radix2_q15 (const arm_cfft_radix2_instance_q15 *S, q15_t *pSrc)
 Processing function for the fixed-point CFFT/CIFFT.
 
void arm_cfft_radix2_q31 (const arm_cfft_radix2_instance_q31 *S, q31_t *pSrc)
 Processing function for the fixed-point CFFT/CIFFT.
 
void arm_cfft_radix4_f16 (const arm_cfft_radix4_instance_f16 *S, float16_t *pSrc)
 Processing function for the floating-point Radix-4 CFFT/CIFFT.
 
void arm_cfft_radix4_f32 (const arm_cfft_radix4_instance_f32 *S, float32_t *pSrc)
 Processing function for the floating-point Radix-4 CFFT/CIFFT.
 
arm_status arm_cfft_radix4_init_f16 (arm_cfft_radix4_instance_f16 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the floating-point CFFT/CIFFT.
 
arm_status arm_cfft_radix4_init_f32 (arm_cfft_radix4_instance_f32 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the floating-point CFFT/CIFFT.
 
arm_status arm_cfft_radix4_init_q15 (arm_cfft_radix4_instance_q15 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the Q15 CFFT/CIFFT.
 
arm_status arm_cfft_radix4_init_q31 (arm_cfft_radix4_instance_q31 *S, uint16_t fftLen, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Initialization function for the Q31 CFFT/CIFFT.
 
void arm_cfft_radix4_q15 (const arm_cfft_radix4_instance_q15 *S, q15_t *pSrc)
 Processing function for the Q15 CFFT/CIFFT.
 
void arm_cfft_radix4_q31 (const arm_cfft_radix4_instance_q31 *S, q31_t *pSrc)
 Processing function for the Q31 CFFT/CIFFT.
 

Description

Function Documentation

◆ arm_cfft_radix2_f16()

void arm_cfft_radix2_f16 ( const arm_cfft_radix2_instance_f16 S,
float16_t *  pSrc 
)

Radix-2 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f16 and will be removed in the future
Parameters
[in]Spoints to an instance of the floating-point Radix-2 CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix2_f32()

void arm_cfft_radix2_f32 ( const arm_cfft_radix2_instance_f32 S,
float32_t pSrc 
)

Radix-2 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f32 and will be removed in the future
Parameters
[in]Spoints to an instance of the floating-point Radix-2 CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix2_init_f16()

arm_status arm_cfft_radix2_init_f16 ( arm_cfft_radix2_instance_f16 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the floating-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f16 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the floating-point CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix2_init_f32()

arm_status arm_cfft_radix2_init_f32 ( arm_cfft_radix2_instance_f32 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the floating-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f32 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the floating-point CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix2_init_q15()

arm_status arm_cfft_radix2_init_q15 ( arm_cfft_radix2_instance_q15 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the Q15 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q15 and will be removed
Parameters
[in,out]Spoints to an instance of the Q15 CFFT/CIFFT structure.
[in]fftLenlength of the FFT.
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix2_init_q31()

arm_status arm_cfft_radix2_init_q31 ( arm_cfft_radix2_instance_q31 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the Q31 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q31 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the Q31 CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix2_q15()

void arm_cfft_radix2_q15 ( const arm_cfft_radix2_instance_q15 S,
q15_t pSrc 
)

Processing function for the fixed-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q15 and will be removed in the future.
Parameters
[in]Spoints to an instance of the fixed-point CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix2_q31()

void arm_cfft_radix2_q31 ( const arm_cfft_radix2_instance_q31 S,
q31_t pSrc 
)

Processing function for the fixed-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q31 and will be removed in the future.
Parameters
[in]Spoints to an instance of the fixed-point CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix4_f16()

void arm_cfft_radix4_f16 ( const arm_cfft_radix4_instance_f16 S,
float16_t *  pSrc 
)

Processing function for the floating-point Radix-4 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f16 and will be removed in the future.
Parameters
[in]Spoints to an instance of the floating-point Radix-4 CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix4_f32()

void arm_cfft_radix4_f32 ( const arm_cfft_radix4_instance_f32 S,
float32_t pSrc 
)

Processing function for the floating-point Radix-4 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_f32 and will be removed in the future.
Parameters
[in]Spoints to an instance of the floating-point Radix-4 CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place

◆ arm_cfft_radix4_init_f16()

arm_status arm_cfft_radix4_init_f16 ( arm_cfft_radix4_instance_f16 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the floating-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superceded by arm_cfft_f16 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the floating-point CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix4_init_f32()

arm_status arm_cfft_radix4_init_f32 ( arm_cfft_radix4_instance_f32 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the floating-point CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superceded by arm_cfft_f32 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the floating-point CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix4_init_q15()

arm_status arm_cfft_radix4_init_q15 ( arm_cfft_radix4_instance_q15 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the Q15 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q15 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the Q15 CFFT/CIFFT structure
[in]fftLenlength of the FFT
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix4_init_q31()

arm_status arm_cfft_radix4_init_q31 ( arm_cfft_radix4_instance_q31 S,
uint16_t  fftLen,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Initialization function for the Q31 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q31 and will be removed in the future.
Parameters
[in,out]Spoints to an instance of the Q31 CFFT/CIFFT structure.
[in]fftLenlength of the FFT.
[in]ifftFlagflag that selects transform direction
  • value = 0: forward transform
  • value = 1: inverse transform
[in]bitReverseFlagflag that enables / disables bit reversal of output
  • value = 0: disables bit reversal of output
  • value = 1: enables bit reversal of output
Returns
execution status
Details
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.

◆ arm_cfft_radix4_q15()

void arm_cfft_radix4_q15 ( const arm_cfft_radix4_instance_q15 S,
q15_t pSrc 
)

Processing function for the Q15 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q15 and will be removed in the future.
Parameters
[in]Spoints to an instance of the Q15 CFFT/CIFFT structure.
[in,out]pSrcpoints to the complex data buffer. Processing occurs in-place.
Input and output formats:
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:
CFFT Size Input format Output format Number of bits to upscale
16 1.15 5.11 4
64 1.15 7.9 6
256 1.15 9.7 8
1024 1.15 11.5 10
CIFFT Size Input format Output format Number of bits to upscale
16 1.15 5.11 0
64 1.15 7.9 0
256 1.15 9.7 0
1024 1.15 11.5 0

◆ arm_cfft_radix4_q31()

void arm_cfft_radix4_q31 ( const arm_cfft_radix4_instance_q31 S,
q31_t pSrc 
)

Processing function for the Q31 CFFT/CIFFT.

Deprecated:
Do not use this function. It has been superseded by arm_cfft_q31 and will be removed in the future.
Parameters
[in]Spoints to an instance of the Q31 CFFT/CIFFT structure
[in,out]pSrcpoints to the complex data buffer of size 2*fftLen. Processing occurs in-place
Input and output formats:
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:
CFFT Size Input format Output format Number of bits to upscale
16 1.31 5.27 4
64 1.31 7.25 6
256 1.31 9.23 8
1024 1.31 11.21 10
CIFFT Size Input format Output format Number of bits to upscale
16 1.31 5.27 0
64 1.31 7.25 0
256 1.31 9.23 0
1024 1.31 11.21 0