Complex FFT Q31
- RISCV_DSP_ATTRIBUTE riscv_status riscv_cfft_init_q31 (riscv_cfft_instance_q31 *S, uint16_t fftLen)
- RISCV_DSP_ATTRIBUTE void riscv_cfft_q31 (const riscv_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
-
FFTINIT(EXT, SIZE)
-
CFFTINIT_Q31(LEN, LENTWIDDLE)
- group ComplexFFTQ31
Defines
-
FFTINIT(EXT, SIZE)
-
CFFTINIT_Q31(LEN, LENTWIDDLE)
Functions
- RISCV_DSP_ATTRIBUTE riscv_status riscv_cfft_init_q31 (riscv_cfft_instance_q31 *S, uint16_t fftLen)
Initialization function for the cfft q31 function for 4096 samples.
Initialization function for the cfft q31 function for 2048 samples
Initialization function for the cfft q31 function for 1024 samples
Initialization function for the cfft q31 function for 512 samples
Initialization function for the cfft q31 function for 256 samples
Initialization function for the cfft q31 function for 128 samples
Initialization function for the cfft q31 function for 64 samples
Initialization function for the cfft q31 function for 32 samples
Initialization function for the cfft q31 function for 16 samples
Generic initialization function for the cfft q31 function- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_const_structs.h
- 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 riscv_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 NMSIS-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.
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
S – [inout] points to an instance of the floating-point CFFT structure
fftLen – [in] fft length (number of complex samples)
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- RISCV_DSP_ATTRIBUTE void riscv_cfft_q31 (const riscv_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
Processing function for the Q31 complex FFT.
- Parameters
S – [in] points to an instance of the fixed-point CFFT structure
p1 – [inout] points to the complex data buffer of size
2*fftLen. Processing occurs in-placeifftFlag – [in] flag that selects transform direction
value = 0: forward transform
value = 1: inverse transform
bitReverseFlag – [in] flag that enables / disables bit reversal of output
value = 0: disables bit reversal of output
value = 1: enables bit reversal of output
-
FFTINIT(EXT, SIZE)