Complex FFT Q31
- CFFTINIT_Q31 (4096, 4096)
- CFFTINIT_Q31 (2048, 1024)
- CFFTINIT_Q31 (1024, 1024)
- CFFTINIT_Q31 (512, 256)
- CFFTINIT_Q31 (256, 256)
- CFFTINIT_Q31 (128, 64)
- CFFTINIT_Q31 (64, 64)
- CFFTINIT_Q31 (32, 16)
- CFFTINIT_Q31 (16, 16)
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riscv_status riscv_cfft_init_q31(riscv_cfft_instance_q31 *S, uint16_t fftLen)
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void riscv_cfft_q31(const riscv_cfft_instance_q31 *S, q31_t *p1, uint8_t ifftFlag, uint8_t bitReverseFlag)
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FFTINIT(EXT, SIZE)
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CFFTINIT_Q31(LEN, LENTWIDDLE)
- group ComplexFFTQ31
Defines
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FFTINIT(EXT, SIZE)
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CFFTINIT_Q31(LEN, LENTWIDDLE)
Functions
- CFFTINIT_Q31 (4096, 4096)
Initialization function for the cfft q31 function for 4096 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (2048, 1024)
Initialization function for the cfft q31 function for 2048 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (1024, 1024)
Initialization function for the cfft q31 function for 1024 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (512, 256)
Initialization function for the cfft q31 function for 512 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (256, 256)
Initialization function for the cfft q31 function for 256 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (128, 64)
Initialization function for the cfft q31 function for 128 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (64, 64)
Initialization function for the cfft q31 function for 64 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (32, 16)
Initialization function for the cfft q31 function for 32 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
- CFFTINIT_Q31 (16, 16)
Initialization function for the cfft q31 function for 16 samples.
- 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
- Parameters
S – [inout] points to an instance of the floating-point CFFT structure
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
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riscv_status riscv_cfft_init_q31(riscv_cfft_instance_q31 *S, uint16_t fftLen)
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
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
fftLen – [in] fft length (number of complex samples)
- Returns
execution status
RISCV_MATH_SUCCESS : Operation successful
RISCV_MATH_ARGUMENT_ERROR : an error is detected
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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
- Returns
none
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FFTINIT(EXT, SIZE)