FFT.c File Reference

#include <math.h>
#include "FFT.h"
#include "arm_const_structs.h"
#include "stm32f769i_discovery_lcd.h"

Go to the source code of this file.

Macros
#define	ROUND(x)   ((x)>=0?(q31_t)((x)+0.5):(q31_t)((x)-0.5))
#define	ALPHA   0.9999

Functions
void	FFT_Display_BarGraph (int ch)
	Draw FFT as bar graph. More...
void	FFT_Display_Points (int ch)
	Draw FFT as points. More...
void	FFT_Display_Lines (int ch)
	Draw FFT as (connected) lines (default) More...
int32_t	FFT_Init (void)
int32_t	FFT_Ready (float32_t **result, int *numResults)
int32_t	FFT_Filter (int ch)
void	FFT_DisplayGraph (int ch)
	Display the FFT, depending on the barType - which type we want to display. More...

Variables
uint32_t	ifftFlag = 0
uint32_t	doBitReverse = 1
uint32_t	refIndex = 213
const uint8_t	lookupInd [] = {25, 27, 30, 34, 39, 45, 52, 60, 69, 79, 90, 102, 115, 127}

Macro Definition Documentation

#define ALPHA   0.9999

#define ROUND

(

x

)

((x)>=0?(q31_t)((x)+0.5):(q31_t)((x)-0.5))

Function Documentation

void FFT_Display_BarGraph

(

int

ch

)

Draw FFT as bar graph.

Parameters

ch	- the channel 0 or 1

Return values

None

Definition at line 499 of file FFT.c.

void FFT_Display_Lines

(

int

ch

)

Draw FFT as (connected) lines (default)

Parameters

ch	- the channel 0 or 1

Return values

None

Definition at line 685 of file FFT.c.

void FFT_Display_Points

(

int

ch

)

Draw FFT as points.

Parameters

ch	- the channel 0 or 1

Return values

None

Definition at line 611 of file FFT.c.

void FFT_DisplayGraph

(

int

ch

)

Display the FFT, depending on the barType - which type we want to display.

Parameters

None

Return values

None

Definition at line 436 of file FFT.c.

int32_t FFT_Filter

(

int

ch

)

Definition at line 336 of file FFT.c.

int32_t FFT_Init

(

void

)

Definition at line 288 of file FFT.c.

int32_t FFT_Ready	(	float32_t **	result,
		int *	numResults
	)

Definition at line 296 of file FFT.c.

Variable Documentation

uint32_t doBitReverse = 1

Definition at line 113 of file FFT.c.

uint32_t ifftFlag = 0

Definition at line 112 of file FFT.c.

const uint8_t lookupInd[] = {25, 27, 30, 34, 39, 45, 52, 60, 69, 79, 90, 102, 115, 127}

Attention

This is just for 256 point FFT (128 bins)

Definition at line 492 of file FFT.c.

uint32_t refIndex = 213

Definition at line 116 of file FFT.c.