变量
const uint16_t	cskyBitRevTable [1024]

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 q15_t ALIGN4	cskyRecipTableQ15 [64]

const q31_t	cskyRecipTableQ31 [64]

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	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	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]

变量说明

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 ALIGN4 cskyRecipTableQ15[64]

end of CFFT_CIFFT group

const q31_t cskyRecipTableQ31[64]

const float32_t sinTable_f32[FAST_MATH_TABLE_SIZE+1]

浮点正弦表生成的示例代码:

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

: 其中 pi 值是 3.14159265358979

const q15_t sinTable_q15[FAST_MATH_TABLE_SIZE+1]

表中的值是Q15格式 (1.15 定点格式) ，并且以3步生成。第一步，生成浮点数的正弦值:

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

其中 pi 的值是 3.14159265358979

: 第二步，转换浮点到 Q15 (定点): (sinTable[i] * pow(2, 15))

: 第三步，舍入到最接近的整数值: sinTable[i] += (sinTable[i] > 0 ? 0.5 :-0.5);

const q31_t sinTable_q31[FAST_MATH_TABLE_SIZE+1]

表中的值是Q31格式 (1.31 定点格式) ，并且以3步生成。第一步，生成浮点数的正弦值:

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

其中 pi 的值是 3.14159265358979

: 第二步，转换浮点到Q31 (定点): (sinTable[i] * pow(2, 31))

: 第三步，舍入到最接近的整数值: 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]

: 浮点RFFT 旋转因子生成的示例代码:

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

: Real 和 Imag 值以交错方式如下

const float32_t twiddleCoef_rfft_4096[4096]

const float32_t twiddleCoef_rfft_512[512]

const float32_t twiddleCoef_rfft_64[64]