csky_common_tables.h File Reference

Macros
#define	CSKYBITREVINDEXTABLE__16_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE__32_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE__64_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_128_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_256_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_512_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE1024_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE2048_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE4096_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED___16_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED___32_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED___64_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED__128_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED__256_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED__512_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH
#define	CSKYBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH
#define	SQRT_2
#define	DEL_U
#define	DEL_V
#define	LN2A
#define	LN2B
#define	E1
#define	E2
#define	E3
#define	E4
#define	U03
#define	HALF
#define	MHALF

Variables
const uint16_t	cskyBitRevTable [1024]
const q15_t	cskyRecipTableQ15 [64]
const q31_t	cskyRecipTableQ31 [64]
const float32_t	twiddleCoef_16 [32]
const float32_t	twiddleCoef_32 [64]
const float32_t	twiddleCoef_64 [128]
const float32_t	twiddleCoef_128 [256]
const float32_t	twiddleCoef_256 [512]
const float32_t	twiddleCoef_512 [1024]
const float32_t	twiddleCoef_1024 [2048]
const float32_t	twiddleCoef_2048 [4096]
const float32_t	twiddleCoef_4096 [8192]
const q31_t	twiddleCoef_16_q31 [24]
const q31_t	twiddleCoef_32_q31 [48]
const q31_t	twiddleCoef_64_q31 [96]
const q31_t	twiddleCoef_128_q31 [192]
const q31_t	twiddleCoef_256_q31 [384]
const q31_t	twiddleCoef_512_q31 [768]
const q31_t	twiddleCoef_1024_q31 [1536]
const q31_t	twiddleCoef_2048_q31 [3072]
const q31_t	twiddleCoef_4096_q31 [6144]
const q15_t	twiddleCoef_16_q15 [24]
const q15_t	twiddleCoef_32_q15 [48]
const q15_t	twiddleCoef_64_q15 [96]
const q15_t	twiddleCoef_128_q15 [192]
const q15_t	twiddleCoef_256_q15 [384]
const q15_t	twiddleCoef_512_q15 [768]
const q15_t	twiddleCoef_1024_q15 [1536]
const q15_t	twiddleCoef_2048_q15 [3072]
const q15_t	twiddleCoef_4096_q15 [6144]
const float32_t	twiddleCoef_rfft_32 [32]
const float32_t	twiddleCoef_rfft_64 [64]
const float32_t	twiddleCoef_rfft_128 [128]
const float32_t	twiddleCoef_rfft_256 [256]
const float32_t	twiddleCoef_rfft_512 [512]
const float32_t	twiddleCoef_rfft_1024 [1024]
const float32_t	twiddleCoef_rfft_2048 [2048]
const float32_t	twiddleCoef_rfft_4096 [4096]
const q15_t	realCoefAQ15 [512]
const q31_t	realCoefAQ31 [512]
const q15_t	realCoefBQ15 [512]
const q31_t	realCoefBQ31 [512]
const float32_t	realCoefA [512]
const float32_t	realCoefB [512]
const q15_t ALIGN4	realCoefAQ15_32 [32]
const q15_t ALIGN4	realCoefBQ15_32 [32]
const q15_t ALIGN4	realCoefAQ15_64 [64]
const q15_t ALIGN4	realCoefBQ15_64 [64]
const q15_t ALIGN4	realCoefAQ15_128 [128]
const q15_t ALIGN4	realCoefBQ15_128 [128]
const q15_t ALIGN4	realCoefAQ15_256 [256]
const q15_t ALIGN4	realCoefBQ15_256 [256]
const q15_t ALIGN4	realCoefAQ15_512 [512]
const q15_t ALIGN4	realCoefBQ15_512 [512]
const q15_t ALIGN4	realCoefAQ15_1024 [1024]
const q15_t ALIGN4	realCoefBQ15_1024 [1024]
const q15_t ALIGN4	realCoefAQ15_2048 [2048]
const q15_t ALIGN4	realCoefBQ15_2048 [2048]
const q15_t ALIGN4	realCoefAQ15_4096 [4096]
const q15_t ALIGN4	realCoefBQ15_4096 [4096]
const q31_t	realCoefAQ31_32 [32]
const q31_t	realCoefBQ31_32 [32]
const q31_t	realCoefAQ31_64 [64]
const q31_t	realCoefBQ31_64 [64]
const q31_t	realCoefAQ31_128 [128]
const q31_t	realCoefBQ31_128 [128]
const q31_t	realCoefAQ31_256 [256]
const q31_t	realCoefBQ31_256 [256]
const q31_t	realCoefAQ31_512 [512]
const q31_t	realCoefBQ31_512 [512]
const q31_t	realCoefAQ31_1024 [1024]
const q31_t	realCoefBQ31_1024 [1024]
const q31_t	realCoefAQ31_2048 [2048]
const q31_t	realCoefBQ31_2048 [2048]
const q31_t	realCoefAQ31_4096 [4096]
const q31_t	realCoefBQ31_4096 [4096]
const uint16_t	cskyBitRevIndexTable16 [CSKYBITREVINDEXTABLE__16_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable32 [CSKYBITREVINDEXTABLE__32_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable64 [CSKYBITREVINDEXTABLE__64_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable128 [CSKYBITREVINDEXTABLE_128_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable256 [CSKYBITREVINDEXTABLE_256_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable512 [CSKYBITREVINDEXTABLE_512_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable1024 [CSKYBITREVINDEXTABLE1024_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable2048 [CSKYBITREVINDEXTABLE2048_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable4096 [CSKYBITREVINDEXTABLE4096_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_16 [CSKYBITREVINDEXTABLE_FIXED___16_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_32 [CSKYBITREVINDEXTABLE_FIXED___32_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_64 [CSKYBITREVINDEXTABLE_FIXED___64_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_128 [CSKYBITREVINDEXTABLE_FIXED__128_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_256 [CSKYBITREVINDEXTABLE_FIXED__256_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_512 [CSKYBITREVINDEXTABLE_FIXED__512_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_1024 [CSKYBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_2048 [CSKYBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH]
const uint16_t	cskyBitRevIndexTable_fixed_4096 [CSKYBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH]
const float32_t	sinTable_f32 [FAST_MATH_TABLE_SIZE+1]
const q31_t	sinTable_q31 [FAST_MATH_TABLE_SIZE+1]
const q15_t	sinTable_q15 [FAST_MATH_TABLE_SIZE+1]
const log2_cof1	ui
const log2_cof2	vj
const exp_cof1	coar
const exp_cof2	fine
const float64_t	exp2_accuratetable [512]
const float32_t	exp2_deltatable [512]
const mynumber	Iu [182]
const mynumber	Iv [362]
const mynumber	Lu [182][2]
const mynumber	Lv [362][2]
static const mynumber	nZERO
static const mynumber	INF
static const mynumber	nINF
static const mynumber	sqrt_2
static const mynumber	ln2a
static const mynumber	ln2b
static const mynumber	bigu
static const mynumber	bigv
static const mynumber	t52
static const mynumber	two52e
static const mynumber	nan
static const mynumber	t256
static const mynumber	ln_two1
static const mynumber	ln_two2
static const mynumber	log2e
static const mynumber	ep2
static const mynumber	ep3
static const mynumber	three33
static const mynumber	three51
static const float64_t	p2
static const float64_t	p3
static const float64_t	p4
static const float64_t	q2
static const float64_t	q3
static const float64_t	q4
static const float64_t	q5
static const float64_t	q6
static const float64_t	r3
static const float64_t	r4
static const float64_t	r5
static const float64_t	r6
static const float64_t	r7
static const float64_t	r8
static const float64_t	s3
static const float64_t	ss3
static const float64_t	s4
static const float64_t	s5
static const float64_t	s6
static const float64_t	s7
static const float64_t	s8
static const float64_t	huge
static const float64_t	tiny
static const float64_t	err_0
static const float64_t	err_1
static const float64_t	zero
static const q31_t	bigint
static const q31_t	badint
static const q31_t	smallint
static const q31_t	hugeint
static const q31_t	infint
static const mynumber	a2
static const mynumber	a3
static const mynumber	b0
static const mynumber	b1
static const mynumber	b2
static const mynumber	b3
static const mynumber	b4
static const mynumber	b5
static const mynumber	b6
static const mynumber	b7
static const mynumber	b8
static const mynumber	c2
static const mynumber	c3
static const mynumber	c4
static const mynumber	c5
static const mynumber	d2
static const mynumber	dd2
static const mynumber	d3
static const mynumber	dd3
static const mynumber	d4
static const mynumber	dd4
static const mynumber	d5
static const mynumber	dd5
static const mynumber	d6
static const mynumber	dd6
static const mynumber	d7
static const mynumber	dd7
static const mynumber	d8
static const mynumber	dd8
static const mynumber	d9
static const mynumber	dd9
static const mynumber	d10
static const mynumber	dd10
static const mynumber	d11
static const mynumber	d12
static const mynumber	d13
static const mynumber	d14
static const mynumber	d15
static const mynumber	d16
static const mynumber	d17
static const mynumber	d18
static const mynumber	d19
static const mynumber	d20
static const mynumber	h1
static const mynumber	h2
static const mynumber	delu
static const mynumber	delv
static const mynumber	e1
static const mynumber	e2
static const mynumber	e3
static const mynumber	e4
static const mynumber	e [4]
static const mynumber	two54
static const mynumber	u03
static const float64_t	ln2
static const float64_t	two54_d
static const float64_t	Lg1
static const float64_t	Lg2
static const float64_t	Lg3
static const float64_t	Lg4
static const float64_t	Lg5
static const float64_t	Lg6
static const float64_t	Lg7
static const float64_t	ivln10
static const float64_t	log10_2hi
static const float64_t	log10_2lo
static const float64_t	TWO1023
static const float64_t	TWOM1000

Macro Definition Documentation

#define CSKYBITREVINDEXTABLE1024_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE2048_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE4096_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_128_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_256_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_512_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE__16_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE__32_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE__64_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED__128_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED__256_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED__512_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED___16_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED___32_TABLE_LENGTH

#define CSKYBITREVINDEXTABLE_FIXED___64_TABLE_LENGTH

#define DEL_U

#define DEL_V

#define E1

#define E2

#define E3

#define E4

#define HALF

#define LN2A

#define LN2B

#define MHALF

#define SQRT_2

#define U03

Variable Documentation

const mynumber a2

static

const mynumber a3

static

const mynumber b0

static

const mynumber b1

static

const mynumber b2

static

const mynumber b3

static

const mynumber b4

static

const mynumber b5

static

const mynumber b6

static

const mynumber b7

static

const mynumber b8

static

const q31_t badint

static

const q31_t bigint

static

const mynumber bigu

static

const mynumber bigv

static

const mynumber c2

static

const mynumber c3

static

const mynumber c4

static

const mynumber c5

static

const exp_cof1 coar

const uint16_t cskyBitRevIndexTable1024[CSKYBITREVINDEXTABLE1024_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable128[CSKYBITREVINDEXTABLE_128_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable16[CSKYBITREVINDEXTABLE__16_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable2048[CSKYBITREVINDEXTABLE2048_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable256[CSKYBITREVINDEXTABLE_256_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable32[CSKYBITREVINDEXTABLE__32_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable4096[CSKYBITREVINDEXTABLE4096_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable512[CSKYBITREVINDEXTABLE_512_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable64[CSKYBITREVINDEXTABLE__64_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_1024[CSKYBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_128[CSKYBITREVINDEXTABLE_FIXED__128_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_16[CSKYBITREVINDEXTABLE_FIXED___16_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_2048[CSKYBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_256[CSKYBITREVINDEXTABLE_FIXED__256_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_32[CSKYBITREVINDEXTABLE_FIXED___32_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_4096[CSKYBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_512[CSKYBITREVINDEXTABLE_FIXED__512_TABLE_LENGTH]

const uint16_t cskyBitRevIndexTable_fixed_64[CSKYBITREVINDEXTABLE_FIXED___64_TABLE_LENGTH]

const q15_t cskyRecipTableQ15[64]

end of CFFT_CIFFT group

const q31_t cskyRecipTableQ31[64]

const mynumber d10

static

const mynumber d11

static

const mynumber d12

static

const mynumber d13

static

const mynumber d14

static

const mynumber d15

static

const mynumber d16

static

const mynumber d17

static

const mynumber d18

static

const mynumber d19

static

const mynumber d2

static

const mynumber d20

static

const mynumber d3

static

const mynumber d4

static

const mynumber d5

static

const mynumber d6

static

const mynumber d7

static

const mynumber d8

static

const mynumber d9

static

const mynumber dd10

static

const mynumber dd2

static

const mynumber dd3

static

const mynumber dd4

static

const mynumber dd5

static

const mynumber dd6

static

const mynumber dd7

static

const mynumber dd8

static

const mynumber dd9

static

const mynumber delu

static

const mynumber delv

static

const mynumber e[4]

static

const mynumber e1

static

const mynumber e2

static

const mynumber e3

static

const mynumber e4

static

const mynumber ep2

static

const mynumber ep3

static

const float64_t err_0

static

const float64_t err_1

static

const float64_t exp2_accuratetable[512]

const float32_t exp2_deltatable[512]

const exp_cof2 fine

const mynumber h1

static

const mynumber h2

static

const float64_t huge

static

const q31_t hugeint

static

const mynumber INF

static

const q31_t infint

static

const mynumber Iu[182]

const mynumber Iv[362]

const float64_t ivln10

static

const float64_t Lg1

static

const float64_t Lg2

static

const float64_t Lg3

static

const float64_t Lg4

static

const float64_t Lg5

static

const float64_t Lg6

static

const float64_t Lg7

static

const float64_t ln2

static

const mynumber ln2a

static

const mynumber ln2b

static

const mynumber ln_two1

static

const mynumber ln_two2

static

const float64_t log10_2hi

static

const float64_t log10_2lo

static

const mynumber log2e

static

const mynumber Lu[182][2]

const mynumber Lv[362][2]

const mynumber nan

static

const mynumber nINF

static

const mynumber nZERO

static

const float64_t p2

static

const float64_t p3

static

const float64_t p4

static

const float64_t q2

static

const float64_t q3

static

const float64_t q4

static

const float64_t q5

static

const float64_t q6

static

const float64_t r3

static

const float64_t r4

static

const float64_t r5

static

const float64_t r6

static

const float64_t r7

static

const float64_t r8

static

const float32_t realCoefA[512]

Generation of realCoefA array:

n = 4096

for (i = 0; i < n; i++)
 {
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

const q15_t realCoefAQ15[512]

Generation fixed-point realCoefAQ15 array in Q15 format:

n = 4096

for (i = 0; i < n; i++)
 {
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

Convert to fixed point Q15 format round(pATable[i] * pow(2, 15))

const q15_t ALIGN4 realCoefAQ15_1024[1024]

const q15_t ALIGN4 realCoefAQ15_128[128]

const q15_t ALIGN4 realCoefAQ15_2048[2048]

const q15_t ALIGN4 realCoefAQ15_256[256]

const q15_t ALIGN4 realCoefAQ15_32[32]

const q15_t ALIGN4 realCoefAQ15_4096[4096]

const q15_t ALIGN4 realCoefAQ15_512[512]

const q15_t ALIGN4 realCoefAQ15_64[64]

const q31_t realCoefAQ31[512]

Generation fixed-point realCoefAQ31 array in Q31 format:

n = 4096

for (i = 0; i < n; i++)
{
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
}

Convert to fixed point Q31 format round(pATable[i] * pow(2, 31))

const q31_t realCoefAQ31_1024[1024]

const q31_t realCoefAQ31_128[128]

const q31_t realCoefAQ31_2048[2048]

const q31_t realCoefAQ31_256[256]

const q31_t realCoefAQ31_32[32]

const q31_t realCoefAQ31_4096[4096]

const q31_t realCoefAQ31_512[512]

const q31_t realCoefAQ31_64[64]

const float32_t realCoefB[512]

Generation of realCoefB array:

n = 4096

for (i = 0; i < n; i++)
{
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

const q15_t realCoefBQ15[512]

Generation of real_CoefB array:

n = 4096

for (i = 0; i < n; i++)
 {
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

Convert to fixed point Q15 format round(pBTable[i] * pow(2, 15))

const q15_t ALIGN4 realCoefBQ15_1024[1024]

const q15_t ALIGN4 realCoefBQ15_128[128]

const q15_t ALIGN4 realCoefBQ15_2048[2048]

const q15_t ALIGN4 realCoefBQ15_256[256]

const q15_t ALIGN4 realCoefBQ15_32[32]

const q15_t ALIGN4 realCoefBQ15_4096[4096]

const q15_t ALIGN4 realCoefBQ15_512[512]

const q15_t ALIGN4 realCoefBQ15_64[64]

const q31_t realCoefBQ31[512]

Generation of realCoefBQ31 array:

n = 4096

for (i = 0; i < n; i++)
{
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
} 

Convert to fixed point Q31 format round(pBTable[i] * pow(2, 31))

const q31_t realCoefBQ31_1024[1024]

const q31_t realCoefBQ31_128[128]

const q31_t realCoefBQ31_2048[2048]

const q31_t realCoefBQ31_256[256]

const q31_t realCoefBQ31_32[32]

const q31_t realCoefBQ31_4096[4096]

const q31_t realCoefBQ31_512[512]

const q31_t realCoefBQ31_64[64]

const float64_t s3

static

const float64_t s4

static

const float64_t s5

static

const float64_t s6

static

const float64_t s7

static

const float64_t s8

static

const float32_t sinTable_f32[FAST_MATH_TABLE_SIZE+1]

Example code for the generation of the floating-point sine table:

tableSize = 512;
for(n = 0; n < (tableSize + 1); n++)
{
     sinTable[n]=sin(2*pi*n/tableSize);
}

where pi value is 3.14159265358979

const q15_t sinTable_q15[FAST_MATH_TABLE_SIZE+1]

Table values are in Q15 (1.15 fixed-point format) and generation is done in three steps. First, generate sin values in floating point:

tableSize = 512;
for(n = 0; n < (tableSize + 1); n++)
{
     sinTable[n]= sin(2*pi*n/tableSize);
} 

where pi value is 3.14159265358979

Second, convert floating-point to Q15 (Fixed point): (sinTable[i] * pow(2, 15))

Finally, round to the nearest integer value: sinTable[i] += (sinTable[i] > 0 ? 0.5 :-0.5);

const q31_t sinTable_q31[FAST_MATH_TABLE_SIZE+1]

Table values are in Q31 (1.31 fixed-point format) and generation is done in three steps. First, generate sin values in floating point:

tableSize = 512;
for(n = 0; n < (tableSize + 1); n++)
{
     sinTable[n]= sin(2*pi*n/tableSize);
} 

where pi value is 3.14159265358979

Second, convert floating-point to Q31 (Fixed point): (sinTable[i] * pow(2, 31))

Finally, round to the nearest integer value: sinTable[i] += (sinTable[i] > 0 ? 0.5 :-0.5);

const q31_t smallint

static

const mynumber sqrt_2

static

const float64_t ss3

static

const mynumber t256

static

const mynumber t52

static

const mynumber three33

static

const mynumber three51

static

const float64_t tiny

static

const float32_t twiddleCoef_rfft_1024[1024]

const float32_t twiddleCoef_rfft_128[128]

const float32_t twiddleCoef_rfft_2048[2048]

const float32_t twiddleCoef_rfft_256[256]

const float32_t twiddleCoef_rfft_32[32]

Example code for Floating-point RFFT Twiddle factors Generation:

TW = exp(2*pi*i*[0:L/2-1]/L - pi/2*i).' 

Real and Imag values are in interleaved fashion

const float32_t twiddleCoef_rfft_4096[4096]

const float32_t twiddleCoef_rfft_512[512]

const float32_t twiddleCoef_rfft_64[64]

const float64_t TWO1023

static

const mynumber two52e

static

const mynumber two54

static

const float64_t two54_d

static

const float64_t TWOM1000

static

const mynumber u03

static

const log2_cof1 ui

const log2_cof2 vj

const float64_t zero

static