ifft.c File Reference

#include "lib/ifft.h"

Macros
#define	ABS(x)   (x < 0 ? -x : x)
#define	RESOLUTION   7
#define	SIN_TAB_LEN   120

Functions
static uint16_t	bitrev (uint16_t j, uint16_t nu)
static int16_t	cosI (uint16_t angleMilli)
void	ifft (int16_t xre[], int16_t xim[], uint16_t n)
static uint16_t	ilog2 (uint16_t val)
static int16_t	sinI (uint16_t angleMilli)

Variables
static const int8_t	SIN_TAB []

#define ABS

(

x

)

(x < 0 ? -x : x)

Referenced by ifft().

#define RESOLUTION   7

Referenced by ifft().

#define SIN_TAB_LEN   120

Referenced by sinI().

static uint16_t bitrev ( uint16_t  j, uint16_t  nu  )

static

Referenced by ifft().

static int16_t cosI ( uint16_t  angleMilli )

static

References sinI().

Referenced by ifft().

void ifft	(	int16_t	xre[],
		int16_t	xim[],
		uint16_t	n
	)

References ABS, bitrev(), c, cosI(), i, ilog2(), n, RESOLUTION, s, and sinI().

static uint16_t ilog2 ( uint16_t  val )

static

Referenced by ifft().

static int16_t sinI ( uint16_t  angleMilli )

static

References SIN_TAB, and SIN_TAB_LEN.

Referenced by cosI(), and ifft().

const int8_t SIN_TAB[]

static

Initial value:

= {
 0,6,13,20,26,33,39,45,52,58,63,69,75,80,
 85,90,95,99,103,107,110,114,116,119,121,
 123,125,126,127,127,127,127,127,126,125,
 123,121,119,116,114,110,107,103,99,95,90,
 85,80,75,69,63,58,52,45,39,33,26,20,13,6,
 0,-6,-13,-20,-26,-33,-39,-45,-52,-58,-63,
 -69,-75,-80,-85,-90,-95,-99,-103,-107,-110,
 -114,-116,-119,-121,-123,-125,-126,-127,-127,
 -127,-127,-127,-126,-125,-123,-121,-119,-116,
 -114,-110,-107,-103,-99,-95,-90,-85,-80,-75,
 -69,-63,-58,-52,-45,-39,-33,-26,-20,-13,-6
}

Referenced by sinI().