Buffer Sizes for CFFT

Functions
int32_t	riscv_cfft_tmp_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the temporary buffer. More...
int32_t	riscv_cfft_output_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the output buffer. More...
int32_t	riscv_cifft_output_buffer_size (riscv_math_datatype dt, uint32_t nb_samples)
	Calculate required length for the output buffer. More...

Detailed Description

Function Documentation

riscv_cfft_output_buffer_size()

int32_t riscv_cfft_output_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the output buffer.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples in the input data

Returns

Length in datatype elements (real numbers) for the output buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported

riscv_cfft_tmp_buffer_size()

int32_t riscv_cfft_tmp_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the temporary buffer.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples

Returns

Length in datatype elements (real numbers) for the temporary buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported

nb_samples is the CFFT length, also means how many complex numbers are in the input buffer nb_samples * 2U is the real numbers, also the real data length nb_samples * 4U is needed for double buffer.

riscv_cifft_output_buffer_size()

int32_t riscv_cifft_output_buffer_size	(	riscv_math_datatype	dt,
		uint32_t	nb_samples
	)

Calculate required length for the output buffer.

Parameters

[in]	dt	Data type of the input data
[in]	nb_samples	Number of samples in the input data

Returns

Length in datatype elements (real numbers) for the output buffer

Note

0 means not applicable (temporary buffer not needed)

-1 means error : configuration not supported