CMSIS-DSP  
CMSIS DSP Software Library
 
Loading...
Searching...
No Matches
Functions
Complex FFT Q31
Transform Functions » Complex FFT Functions

Functions

arm_status arm_cfft_init_4096_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 4096 samples.
 
arm_status arm_cfft_init_2048_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 2048 samples.
 
arm_status arm_cfft_init_1024_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 1024 samples.
 
arm_status arm_cfft_init_512_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 512 samples.
 
arm_status arm_cfft_init_256_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 256 samples.
 
arm_status arm_cfft_init_128_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 128 samples.
 
arm_status arm_cfft_init_64_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 64 samples.
 
arm_status arm_cfft_init_32_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 32 samples.
 
arm_status arm_cfft_init_16_q31 (arm_cfft_instance_q31 *S)
 Initialization function for the cfft q31 function for 16 samples.
 
arm_status arm_cfft_init_q31 (arm_cfft_instance_q31 *S, uint16_t fftLen)
 Generic initialization function for the cfft q31 function.
 
void arm_cfft_q31 (const arm_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Processing function for the Q31 complex FFT.
 

Description

Function Documentation

◆ arm_cfft_init_1024_q31()

arm_status arm_cfft_init_1024_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 1024 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_128_q31()

arm_status arm_cfft_init_128_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 128 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_16_q31()

arm_status arm_cfft_init_16_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 16 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_2048_q31()

arm_status arm_cfft_init_2048_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 2048 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_256_q31()

arm_status arm_cfft_init_256_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 256 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_32_q31()

arm_status arm_cfft_init_32_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 32 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_4096_q31()

arm_status arm_cfft_init_4096_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 4096 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_512_q31()

arm_status arm_cfft_init_512_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 512 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_64_q31()

arm_status arm_cfft_init_64_q31 ( arm_cfft_instance_q31 *  S)

Initialization function for the cfft q31 function for 64 samples.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h

◆ arm_cfft_init_q31()

arm_status arm_cfft_init_q31 ( arm_cfft_instance_q31 *  S,
uint16_t  fftLen 
)

Generic initialization function for the cfft q31 function.

Parameters
[in,out]Spoints to an instance of the floating-point CFFT structure
[in]fftLenfft length (number of complex samples)
Returns
execution status
Use of this function is mandatory only for the MVE version of the FFT.
Other versions can still initialize directly the data structure using variables declared in arm_const_structs.h
This function should be used only if you don't know the FFT sizes that you'll need at build time. The use of this function will prevent the linker from removing the FFT tables that are not needed and the library code size will be bigger than needed.
If you use CMSIS-DSP as a static library, and if you know the FFT sizes that you need at build time, then it is better to use the initialization functions defined for each FFT size.

◆ arm_cfft_q31()

void arm_cfft_q31 ( const arm_cfft_instance_q31 *  S,
q31_t *  p1,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Processing function for the Q31 complex FFT.

Parameters
[in]Spoints to an instance of the fixed-point CFFT structure
[in,out]p1points to the complex data buffer of size 2*fftLen. Processing occurs in-place
[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