arm_common_tables.c File Reference

Functions
const q15_t	__ALIGNED (4)
	Weights Table. More...

Variables
const uint16_t	armBitRevTable [1024]
	Table for bit reversal process. More...
const float32_t	twiddleCoef_16 [32]
	Floating-point Twiddle factors Table Generation. More...
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]
	Q31 Twiddle factors Table. More...
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]
	q15 Twiddle factors Table More...
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 uint16_t	armBitRevIndexTable16 [ARMBITREVINDEXTABLE_16_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable32 [ARMBITREVINDEXTABLE_32_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable64 [ARMBITREVINDEXTABLE_64_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable128 [ARMBITREVINDEXTABLE_128_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable256 [ARMBITREVINDEXTABLE_256_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable512 [ARMBITREVINDEXTABLE_512_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable1024 [ARMBITREVINDEXTABLE_1024_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable2048 [ARMBITREVINDEXTABLE_2048_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable4096 [ARMBITREVINDEXTABLE_4096_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_16 [ARMBITREVINDEXTABLE_FIXED_16_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_32 [ARMBITREVINDEXTABLE_FIXED_32_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_64 [ARMBITREVINDEXTABLE_FIXED_64_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_128 [ARMBITREVINDEXTABLE_FIXED_128_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_256 [ARMBITREVINDEXTABLE_FIXED_256_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_512 [ARMBITREVINDEXTABLE_FIXED_512_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_1024 [ARMBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_2048 [ARMBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH]
const uint16_t	armBitRevIndexTable_fixed_4096 [ARMBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH]
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 float32_t	realCoefA [8192]
const float32_t	realCoefB [8192]
const q31_t	realCoefAQ31 [8192]
const q31_t	realCoefBQ31 [8192]
const float32_t	Weights_128 [256]
	Weights Table. More...
const float32_t	cos_factors_128 [128]
const float32_t	Weights_512 [1024]
const float32_t	cos_factors_512 [512]
const float32_t	Weights_2048 [4096]
const float32_t	cos_factors_2048 [2048]
const float32_t	Weights_8192 [16384]
const float32_t	cos_factors_8192 [8192]
const q31_t	WeightsQ31_128 [256]
const q31_t	cos_factorsQ31_128 [128]
const q31_t	WeightsQ31_512 [1024]
const q31_t	cos_factorsQ31_512 [512]
const q31_t	WeightsQ31_2048 [4096]
const q31_t	cos_factorsQ31_2048 [2048]
const q31_t	WeightsQ31_8192 [16384]
const q31_t	cos_factorsQ31_8192 [8192]
const q31_t	armRecipTableQ31 [64]
	Q31 table for reciprocal. More...
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]

Variable Documentation

const uint16_t armBitRevIndexTable1024[ARMBITREVINDEXTABLE_1024_TABLE_LENGTH]

const uint16_t armBitRevIndexTable128[ARMBITREVINDEXTABLE_128_TABLE_LENGTH]

const uint16_t armBitRevIndexTable16[ARMBITREVINDEXTABLE_16_TABLE_LENGTH]

end of CFFT_CIFFT group

const uint16_t armBitRevIndexTable2048[ARMBITREVINDEXTABLE_2048_TABLE_LENGTH]

const uint16_t armBitRevIndexTable256[ARMBITREVINDEXTABLE_256_TABLE_LENGTH]

const uint16_t armBitRevIndexTable32[ARMBITREVINDEXTABLE_32_TABLE_LENGTH]

const uint16_t armBitRevIndexTable4096[ARMBITREVINDEXTABLE_4096_TABLE_LENGTH]

const uint16_t armBitRevIndexTable512[ARMBITREVINDEXTABLE_512_TABLE_LENGTH]

const uint16_t armBitRevIndexTable64[ARMBITREVINDEXTABLE_64_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_1024[ARMBITREVINDEXTABLE_FIXED_1024_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_128[ARMBITREVINDEXTABLE_FIXED_128_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_16[ARMBITREVINDEXTABLE_FIXED_16_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_2048[ARMBITREVINDEXTABLE_FIXED_2048_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_256[ARMBITREVINDEXTABLE_FIXED_256_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_32[ARMBITREVINDEXTABLE_FIXED_32_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_4096[ARMBITREVINDEXTABLE_FIXED_4096_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_512[ARMBITREVINDEXTABLE_FIXED_512_TABLE_LENGTH]

const uint16_t armBitRevIndexTable_fixed_64[ARMBITREVINDEXTABLE_FIXED_64_TABLE_LENGTH]

const q31_t armRecipTableQ31[64]

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

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]