CMSIS-DSP  
CMSIS DSP Software Library
 
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Functions

void arm_cfft_f64 (const arm_cfft_instance_f64 *S, float64_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
 Processing function for the Double Precision floating-point complex FFT.
 
arm_status arm_cfft_init_4096_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 4096 samples.
 
arm_status arm_cfft_init_2048_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 2048 samples.
 
arm_status arm_cfft_init_1024_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 1024 samples.
 
arm_status arm_cfft_init_512_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 512 samples.
 
arm_status arm_cfft_init_256_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 256 samples.
 
arm_status arm_cfft_init_128_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 128 samples.
 
arm_status arm_cfft_init_64_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 64 samples.
 
arm_status arm_cfft_init_32_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 32 samples.
 
arm_status arm_cfft_init_16_f64 (arm_cfft_instance_f64 *S)
 Initialization function for the cfft f64 function with 16 samples.
 
arm_status arm_cfft_init_f64 (arm_cfft_instance_f64 *S, uint16_t fftLen)
 Generic initialization function for the cfft f64 function.
 

Description

Function Documentation

◆ arm_cfft_f64()

void arm_cfft_f64 ( const arm_cfft_instance_f64 S,
float64_t p1,
uint8_t  ifftFlag,
uint8_t  bitReverseFlag 
)

Processing function for the Double Precision floating-point complex FFT.

Parameters
[in]Spoints to an instance of the Double Precision floating-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

◆ arm_cfft_init_1024_f64()

arm_status arm_cfft_init_1024_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_128_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_16_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_2048_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_256_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_32_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_4096_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_512_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_64_f64 ( arm_cfft_instance_f64 S)

Initialization function for the cfft f64 function with 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_f64()

arm_status arm_cfft_init_f64 ( arm_cfft_instance_f64 S,
uint16_t  fftLen 
)

Generic initialization function for the cfft f64 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.