FFT

Data Structures
struct	__FFT_HandleTypeDef
struct	FFT_ConfigTypeDef

Macros
#define	FFT1_LEN_MAX   (FFT_LEN_512)

Typedefs
typedef struct __FFT_HandleTypeDef	FFT_HandleTypeDef

Enumerations
enum	HAL_FFT_StateTypeDef {   HAL_FFT_STATE_RESET = 0x00U,   HAL_FFT_STATE_READY = 0x01U,   HAL_FFT_STATE_BUSY = 0x02U,   HAL_FFT_STATE_ERROR = 0x03U,   HAL_FFT_STATE_CDCT_REAL = 0x04U }
	HAL FFT State structures definition. More...
enum	FFT_BitwidthTypeDef {   FFT_BW_8BIT = 0,   FFT_BW_16BIT = 1,   FFT_BW_32BIT = 2,   FFT_BW_MAX }
enum	FFT_FFTLengthTypeDef {   FFT_LEN_16 = 0,   FFT_LEN_32 = 1,   FFT_LEN_64 = 2,   FFT_LEN_128 = 3,   FFT_LEN_256 = 4,   FFT_LEN_512 = 5,   FFT_LEN_1024 = 6,   FFT_LEN_2048 = 7,   FFT_LEN_4096 = 8,   FFT_LEN_TYPE_NUM }

Functions
HAL_StatusTypeDef	HAL_FFT_Init (FFT_HandleTypeDef *fft)
	Init FFT Accelerator. More...
HAL_StatusTypeDef	HAL_FFT_DeInit (FFT_HandleTypeDef *fft)
	DeInit FFT Accelerator. More...
HAL_StatusTypeDef	HAL_FFT_StartFFT (FFT_HandleTypeDef *fft, FFT_ConfigTypeDef *config)
	Start FFT in synchronous mode. More...
HAL_StatusTypeDef	HAL_FFT_StartFFT_IT (FFT_HandleTypeDef *fft, FFT_ConfigTypeDef *config)
	Start FFT in asynchronous mode. More...
HAL_StatusTypeDef	HAL_FFT_StartDCT (FFT_HandleTypeDef *fft, DCT_ConfigTypeDef *config)
	Start DCT in synchronous mode. More...
HAL_StatusTypeDef	HAL_FFT_StartDCT_IT (FFT_HandleTypeDef *fft, DCT_ConfigTypeDef *config)
	Start DCT in asynchronous mode. More...
HAL_StatusTypeDef	HAL_FFT_IRQHandler (FFT_HandleTypeDef *fft)

Detailed Description

Macro Definition Documentation

FFT1_LEN_MAX

#define FFT1_LEN_MAX   (FFT_LEN_512)

FFT1 max length

Typedef Documentation

FFT_HandleTypeDef

typedef struct __FFT_HandleTypeDef FFT_HandleTypeDef

FFT handle structure definition

Enumeration Type Documentation

FFT_BitwidthTypeDef

enum FFT_BitwidthTypeDef

FFT Bitwidth Type Definition

FFT_FFTLengthTypeDef

enum FFT_FFTLengthTypeDef

FFT Length Type Definition

HAL_FFT_StateTypeDef

enum HAL_FFT_StateTypeDef

HAL FFT State structures definition.

Enumerator
HAL_FFT_STATE_RESET	FFT not yet initialized or disabled
HAL_FFT_STATE_READY	Peripheral Initialized and ready for use
HAL_FFT_STATE_BUSY	An internal process is ongoing
HAL_FFT_STATE_ERROR	FFT state error
HAL_FFT_STATE_CDCT_REAL	CDCT real part calculation ongoing state

Function Documentation

HAL_FFT_DeInit()

HAL_StatusTypeDef HAL_FFT_DeInit

(

FFT_HandleTypeDef *

fft

)

DeInit FFT Accelerator.

Return values

status

HAL_FFT_Init()

HAL_StatusTypeDef HAL_FFT_Init

(

FFT_HandleTypeDef *

fft

)

Init FFT Accelerator.

Return values

status

HAL_FFT_StartDCT()

HAL_StatusTypeDef HAL_FFT_StartDCT	(	FFT_HandleTypeDef *	fft,
		DCT_ConfigTypeDef *	config
	)

Start DCT in synchronous mode.

8bit DCT: input format is Q1.7, output format as follows

DCT Length	Output Format
8	4.4
16	5.3
32	5.3
64	6.2
128	6.2
256	7.1

16bit DCT: input format is Q1.15, output format as follows

DCT Length	Output Format
8	4.12
16	5.11
32	5.11
64	6.10
128	6.10
256	7.9

32bit DCT: input format is Q1.31, output format as follows

DCT Length	Output Format
8	4.28
16	5.27
32	5.27
64	6.26
128	6.26
256	7.25

Parameters

[in]	fft	FFT handle
[in]	config	DCT config

Return values

status

HAL_FFT_StartDCT_IT()

HAL_StatusTypeDef HAL_FFT_StartDCT_IT	(	FFT_HandleTypeDef *	fft,
		DCT_ConfigTypeDef *	config
	)

Start DCT in asynchronous mode.

CpltCallback is called after complete

Input and output data format is same as HAL_FFT_StartDCT

Parameters

[in]	fft	FFT handle
[in]	config	DCT config

Return values

status

HAL_FFT_StartFFT()

HAL_StatusTypeDef HAL_FFT_StartFFT	(	FFT_HandleTypeDef *	fft,
		FFT_ConfigTypeDef *	config
	)

Start FFT in synchronous mode.

8bit FFT: input format is Q1.7, output format as follows, for FFT length greater than 128, output value needs to be upscaled accordingly further to match the FFT definition

FFT Length	Output Format	Upscale value
16	5.3	0
32	6.3	0
64	7.1	0
128	8.0	0
256	8.0	upscale by 2
512	8.0	upscale by 4
1024	8.0	upscale by 8
2048	8.0	upscale by 16
4096	8.0	upscale by 32

8bit IFFT: input format is Q1.7, output format is Q1.7

16bit FFT: input format is Q1.15, output format as follows

FFT Length	Output Format
16	5.11
32	6.10
64	7.9
128	8.8
256	9.7
512	10.6
1024	11.5
2048	12.4
4096	13.3

16bit IFFT: input format is Q1.15, output format is Q1.15

32bit FFT: input format is Q1.31, output format as follows

FFT Length	Output Format
16	5.27
32	6.26
64	7.25
128	8.24
256	9.23
512	10.22
1024	11.21
2048	12.20
4096	13.19

32bit IFFT: input format is Q1.31, output format is Q1.31

Parameters

[in]	fft	FFT handle
[in]	config	FFT config

Return values

status

HAL_FFT_StartFFT_IT()

HAL_StatusTypeDef HAL_FFT_StartFFT_IT	(	FFT_HandleTypeDef *	fft,
		FFT_ConfigTypeDef *	config
	)

Start FFT in asynchronous mode.

CpltCallback is called after complete

Input and output data format is same as HAL_FFT_StartFFT

Parameters

[in]	fft	FFT handle
[in]	config	FFT config

Return values

status