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| <h1>arm_rfft_q31.c</h1> </div> |
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| <div class="contents"> |
| <a href="arm__rfft__q31_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span> |
| <a name="l00003"></a>00003 <span class="comment">* </span> |
| <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span> |
| <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span> |
| <a name="l00006"></a>00006 <span class="comment">* </span> |
| <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span> |
| <a name="l00008"></a>00008 <span class="comment">* Title: arm_rfft_q31.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: RFFT & RIFFT Q31 process function </span> |
| <a name="l00011"></a>00011 <span class="comment">* </span> |
| <a name="l00012"></a>00012 <span class="comment">* </span> |
| <a name="l00013"></a>00013 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span> |
| <a name="l00014"></a>00014 <span class="comment">* </span> |
| <a name="l00015"></a>00015 <span class="comment">* Version 1.0.10 2011/7/15 </span> |
| <a name="l00016"></a>00016 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span> |
| <a name="l00017"></a>00017 <span class="comment">* </span> |
| <a name="l00018"></a>00018 <span class="comment">* Version 1.0.3 2010/11/29 </span> |
| <a name="l00019"></a>00019 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span> |
| <a name="l00020"></a>00020 <span class="comment">* </span> |
| <a name="l00021"></a>00021 <span class="comment">* Version 1.0.2 2010/11/11 </span> |
| <a name="l00022"></a>00022 <span class="comment">* Documentation updated. </span> |
| <a name="l00023"></a>00023 <span class="comment">* </span> |
| <a name="l00024"></a>00024 <span class="comment">* Version 1.0.1 2010/10/05 </span> |
| <a name="l00025"></a>00025 <span class="comment">* Production release and review comments incorporated. </span> |
| <a name="l00026"></a>00026 <span class="comment">* </span> |
| <a name="l00027"></a>00027 <span class="comment">* Version 1.0.0 2010/09/20 </span> |
| <a name="l00028"></a>00028 <span class="comment">* Production release and review comments incorporated. </span> |
| <a name="l00029"></a>00029 <span class="comment">* </span> |
| <a name="l00030"></a>00030 <span class="comment">* Version 0.0.7 2010/06/10 </span> |
| <a name="l00031"></a>00031 <span class="comment">* Misra-C changes done </span> |
| <a name="l00032"></a>00032 <span class="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00033"></a>00033 |
| <a name="l00034"></a>00034 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00035"></a>00035 |
| <a name="l00036"></a>00036 <span class="comment">/*-------------------------------------------------------------------- </span> |
| <a name="l00037"></a>00037 <span class="comment">* Internal functions prototypes </span> |
| <a name="l00038"></a>00038 <span class="comment">--------------------------------------------------------------------*/</span> |
| <a name="l00039"></a>00039 |
| <a name="l00040"></a>00040 <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q31_8c.html#a520e1c358d44fcd2724cb19d46eb5dfa" title="Core Real FFT process.">arm_split_rfft_q31</a>( |
| <a name="l00041"></a>00041 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc, |
| <a name="l00042"></a>00042 uint32_t fftLen, |
| <a name="l00043"></a>00043 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pATable, |
| <a name="l00044"></a>00044 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pBTable, |
| <a name="l00045"></a>00045 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst, |
| <a name="l00046"></a>00046 uint32_t modifier); |
| <a name="l00047"></a>00047 |
| <a name="l00048"></a>00048 <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q31_8c.html#acc62dd39a59091c4d6a80d4e55adeb13" title="Core Real IFFT process.">arm_split_rifft_q31</a>( |
| <a name="l00049"></a>00049 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc, |
| <a name="l00050"></a>00050 uint32_t fftLen, |
| <a name="l00051"></a>00051 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pATable, |
| <a name="l00052"></a>00052 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pBTable, |
| <a name="l00053"></a>00053 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst, |
| <a name="l00054"></a>00054 uint32_t modifier); |
| <a name="l00055"></a>00055 |
| <a name="l00080"></a><a class="code" href="group___r_f_f_t___r_i_f_f_t.html#gabaeab5646aeea9844e6d42ca8c73fe3a">00080</a> <span class="keywordtype">void</span> <a class="code" href="group___r_f_f_t___r_i_f_f_t.html#gabaeab5646aeea9844e6d42ca8c73fe3a" title="Processing function for the Q31 RFFT/RIFFT.">arm_rfft_q31</a>( |
| <a name="l00081"></a>00081 <span class="keyword">const</span> <a class="code" href="structarm__rfft__instance__q31.html" title="Instance structure for the Q31 RFFT/RIFFT function.">arm_rfft_instance_q31</a> * S, |
| <a name="l00082"></a>00082 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc, |
| <a name="l00083"></a>00083 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst) |
| <a name="l00084"></a>00084 { |
| <a name="l00085"></a>00085 <span class="keyword">const</span> <a class="code" href="structarm__cfft__radix4__instance__q31.html" title="Instance structure for the Q31 CFFT/CIFFT function.">arm_cfft_radix4_instance_q31</a> *S_CFFT = S-><a class="code" href="structarm__rfft__instance__q31.html#ac6bf12707e1985818d161616adf27977">pCfft</a>; |
| <a name="l00086"></a>00086 |
| <a name="l00087"></a>00087 <span class="comment">/* Calculation of RIFFT of input */</span> |
| <a name="l00088"></a>00088 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q31.html#af5c2615e6cde15524df38fa57ea32d94">ifftFlagR</a> == 1u) |
| <a name="l00089"></a>00089 { |
| <a name="l00090"></a>00090 <span class="comment">/* Real IFFT core process */</span> |
| <a name="l00091"></a>00091 <a class="code" href="arm__rfft__q31_8c.html#acc62dd39a59091c4d6a80d4e55adeb13" title="Core Real IFFT process.">arm_split_rifft_q31</a>(pSrc, S-><a class="code" href="structarm__rfft__instance__q31.html#a7d1a948bb8a23bf5419bb6f9ef43dd76">fftLenBy2</a>, S-><a class="code" href="structarm__rfft__instance__q31.html#a2a0c944e66bab92fcbe19d1c29153250">pTwiddleAReal</a>, |
| <a name="l00092"></a>00092 S-><a class="code" href="structarm__rfft__instance__q31.html#ae5070be4c2e0327e618f5e1f4c5b9d80">pTwiddleBReal</a>, pDst, S-><a class="code" href="structarm__rfft__instance__q31.html#a6fc90252b579f7c29e01bd279334fc43">twidCoefRModifier</a>); |
| <a name="l00093"></a>00093 |
| <a name="l00094"></a>00094 <span class="comment">/* Complex readix-4 IFFT process */</span> |
| <a name="l00095"></a>00095 <a class="code" href="arm__cfft__radix4__q31_8c.html#ac9c7c553114c1201a3a987a11b8a6d01" title="Core function for the Q31 CIFFT butterfly process.">arm_radix4_butterfly_inverse_q31</a>(pDst, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#ab413d2a5d3f45fa187d93813bf3bf81b">fftLen</a>, |
| <a name="l00096"></a>00096 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a561c22dee4cbdcfa0fd5f15106ecc306">pTwiddle</a>, |
| <a name="l00097"></a>00097 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a8cf8187b8232815cf17ee82bf572ecf9">twidCoefModifier</a>); |
| <a name="l00098"></a>00098 <span class="comment">/* Bit reversal process */</span> |
| <a name="l00099"></a>00099 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q31.html#a3cb90cdc928a88b0203917dcb3dc1b71">bitReverseFlagR</a> == 1u) |
| <a name="l00100"></a>00100 { |
| <a name="l00101"></a>00101 <a class="code" href="arm__cfft__radix4__q31_8c.html#a27618705158b5c42db5fb0a381f8efc1" title="In-place bit reversal function.">arm_bitreversal_q31</a>(pDst, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#ab413d2a5d3f45fa187d93813bf3bf81b">fftLen</a>, |
| <a name="l00102"></a>00102 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a94d2fead4efa4d5eaae142bbe30b0e15">bitRevFactor</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a33a3bc774c97373261699463c05dfe54">pBitRevTable</a>); |
| <a name="l00103"></a>00103 } |
| <a name="l00104"></a>00104 } |
| <a name="l00105"></a>00105 <span class="keywordflow">else</span> |
| <a name="l00106"></a>00106 { |
| <a name="l00107"></a>00107 <span class="comment">/* Calculation of RFFT of input */</span> |
| <a name="l00108"></a>00108 |
| <a name="l00109"></a>00109 <span class="comment">/* Complex readix-4 FFT process */</span> |
| <a name="l00110"></a>00110 <a class="code" href="arm__cfft__radix4__q31_8c.html#ac12f1e7f159d5741358cdc36830a0395" title="Core function for the Q31 CFFT butterfly process.">arm_radix4_butterfly_q31</a>(pSrc, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#ab413d2a5d3f45fa187d93813bf3bf81b">fftLen</a>, |
| <a name="l00111"></a>00111 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a561c22dee4cbdcfa0fd5f15106ecc306">pTwiddle</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a8cf8187b8232815cf17ee82bf572ecf9">twidCoefModifier</a>); |
| <a name="l00112"></a>00112 |
| <a name="l00113"></a>00113 <span class="comment">/* Bit reversal process */</span> |
| <a name="l00114"></a>00114 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q31.html#a3cb90cdc928a88b0203917dcb3dc1b71">bitReverseFlagR</a> == 1u) |
| <a name="l00115"></a>00115 { |
| <a name="l00116"></a>00116 <a class="code" href="arm__cfft__radix4__q31_8c.html#a27618705158b5c42db5fb0a381f8efc1" title="In-place bit reversal function.">arm_bitreversal_q31</a>(pSrc, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#ab413d2a5d3f45fa187d93813bf3bf81b">fftLen</a>, |
| <a name="l00117"></a>00117 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a94d2fead4efa4d5eaae142bbe30b0e15">bitRevFactor</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q31.html#a33a3bc774c97373261699463c05dfe54">pBitRevTable</a>); |
| <a name="l00118"></a>00118 } |
| <a name="l00119"></a>00119 |
| <a name="l00120"></a>00120 <span class="comment">/* Real FFT core process */</span> |
| <a name="l00121"></a>00121 <a class="code" href="arm__rfft__q31_8c.html#a520e1c358d44fcd2724cb19d46eb5dfa" title="Core Real FFT process.">arm_split_rfft_q31</a>(pSrc, S-><a class="code" href="structarm__rfft__instance__q31.html#a7d1a948bb8a23bf5419bb6f9ef43dd76">fftLenBy2</a>, S-><a class="code" href="structarm__rfft__instance__q31.html#a2a0c944e66bab92fcbe19d1c29153250">pTwiddleAReal</a>, |
| <a name="l00122"></a>00122 S-><a class="code" href="structarm__rfft__instance__q31.html#ae5070be4c2e0327e618f5e1f4c5b9d80">pTwiddleBReal</a>, pDst, S-><a class="code" href="structarm__rfft__instance__q31.html#a6fc90252b579f7c29e01bd279334fc43">twidCoefRModifier</a>); |
| <a name="l00123"></a>00123 } |
| <a name="l00124"></a>00124 |
| <a name="l00125"></a>00125 } |
| <a name="l00126"></a>00126 |
| <a name="l00127"></a>00127 |
| <a name="l00143"></a><a class="code" href="arm__rfft__q31_8c.html#a520e1c358d44fcd2724cb19d46eb5dfa">00143</a> <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q31_8c.html#a520e1c358d44fcd2724cb19d46eb5dfa" title="Core Real FFT process.">arm_split_rfft_q31</a>( |
| <a name="l00144"></a>00144 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc, |
| <a name="l00145"></a>00145 uint32_t fftLen, |
| <a name="l00146"></a>00146 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pATable, |
| <a name="l00147"></a>00147 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pBTable, |
| <a name="l00148"></a>00148 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst, |
| <a name="l00149"></a>00149 uint32_t modifier) |
| <a name="l00150"></a>00150 { |
| <a name="l00151"></a>00151 uint32_t i; <span class="comment">/* Loop Counter */</span> |
| <a name="l00152"></a>00152 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> outR, outI; <span class="comment">/* Temporary variables for output */</span> |
| <a name="l00153"></a>00153 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pCoefA, *pCoefB; <span class="comment">/* Temporary pointers for twiddle factors */</span> |
| <a name="l00154"></a>00154 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> CoefA1, CoefA2, CoefB1; <span class="comment">/* Temporary variables for twiddle coefficients */</span> |
| <a name="l00155"></a>00155 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pOut1 = &pDst[2], *pOut2 = &pDst[(4u * fftLen) - 1u]; |
| <a name="l00156"></a>00156 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pIn1 = &pSrc[2], *pIn2 = &pSrc[(2u * fftLen) - 1u]; |
| <a name="l00157"></a>00157 |
| <a name="l00158"></a>00158 pSrc[2u * fftLen] = pSrc[0]; |
| <a name="l00159"></a>00159 pSrc[(2u * fftLen) + 1u] = pSrc[1]; |
| <a name="l00160"></a>00160 |
| <a name="l00161"></a>00161 <span class="comment">/* Init coefficient pointers */</span> |
| <a name="l00162"></a>00162 pCoefA = &pATable[modifier * 2u]; |
| <a name="l00163"></a>00163 pCoefB = &pBTable[modifier * 2u]; |
| <a name="l00164"></a>00164 |
| <a name="l00165"></a>00165 i = fftLen - 1u; |
| <a name="l00166"></a>00166 |
| <a name="l00167"></a>00167 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00168"></a>00168 { |
| <a name="l00169"></a>00169 <span class="comment">/* </span> |
| <a name="l00170"></a>00170 <span class="comment"> outR = (pSrc[2 * i] * pATable[2 * i] - pSrc[2 * i + 1] * pATable[2 * i + 1] </span> |
| <a name="l00171"></a>00171 <span class="comment"> + pSrc[2 * n - 2 * i] * pBTable[2 * i] + </span> |
| <a name="l00172"></a>00172 <span class="comment"> pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span> |
| <a name="l00173"></a>00173 <span class="comment"> */</span> |
| <a name="l00174"></a>00174 |
| <a name="l00175"></a>00175 <span class="comment">/* outI = (pIn[2 * i + 1] * pATable[2 * i] + pIn[2 * i] * pATable[2 * i + 1] + </span> |
| <a name="l00176"></a>00176 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span> |
| <a name="l00177"></a>00177 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); */</span> |
| <a name="l00178"></a>00178 |
| <a name="l00179"></a>00179 CoefA1 = *pCoefA++; |
| <a name="l00180"></a>00180 CoefA2 = *pCoefA; |
| <a name="l00181"></a>00181 |
| <a name="l00182"></a>00182 <span class="comment">/* outR = (pSrc[2 * i] * pATable[2 * i] */</span> |
| <a name="l00183"></a>00183 outR = ((int32_t) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn1 * CoefA1) >> 32)); |
| <a name="l00184"></a>00184 |
| <a name="l00185"></a>00185 <span class="comment">/* outI = pIn[2 * i] * pATable[2 * i + 1] */</span> |
| <a name="l00186"></a>00186 outI = ((int32_t) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn1++ * CoefA2) >> 32)); |
| <a name="l00187"></a>00187 |
| <a name="l00188"></a>00188 <span class="comment">/* - pSrc[2 * i + 1] * pATable[2 * i + 1] */</span> |
| <a name="l00189"></a>00189 outR = |
| <a name="l00190"></a>00190 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn1 * (-CoefA2))) >> 32); |
| <a name="l00191"></a>00191 |
| <a name="l00192"></a>00192 <span class="comment">/* (pIn[2 * i + 1] * pATable[2 * i] */</span> |
| <a name="l00193"></a>00193 outI = |
| <a name="l00194"></a>00194 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) + ((q63_t) * pIn1++ * (CoefA1))) >> 32); |
| <a name="l00195"></a>00195 |
| <a name="l00196"></a>00196 <span class="comment">/* pSrc[2 * n - 2 * i] * pBTable[2 * i] */</span> |
| <a name="l00197"></a>00197 outR = |
| <a name="l00198"></a>00198 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn2 * (-CoefA2))) >> 32); |
| <a name="l00199"></a>00199 CoefB1 = *pCoefB; |
| <a name="l00200"></a>00200 |
| <a name="l00201"></a>00201 <span class="comment">/* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */</span> |
| <a name="l00202"></a>00202 outI = |
| <a name="l00203"></a>00203 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) + ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn2-- * (-CoefB1))) >> 32); |
| <a name="l00204"></a>00204 |
| <a name="l00205"></a>00205 <span class="comment">/* pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */</span> |
| <a name="l00206"></a>00206 outR = |
| <a name="l00207"></a>00207 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((q63_t) * pIn2 * (CoefB1))) >> 32); |
| <a name="l00208"></a>00208 |
| <a name="l00209"></a>00209 <span class="comment">/* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */</span> |
| <a name="l00210"></a>00210 outI = |
| <a name="l00211"></a>00211 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) + ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn2-- * (-CoefA2))) >> 32); |
| <a name="l00212"></a>00212 |
| <a name="l00213"></a>00213 <span class="comment">/* write output */</span> |
| <a name="l00214"></a>00214 *pOut1++ = (outR << 1u); |
| <a name="l00215"></a>00215 *pOut1++ = (outI << 1u); |
| <a name="l00216"></a>00216 |
| <a name="l00217"></a>00217 <span class="comment">/* write complex conjugate output */</span> |
| <a name="l00218"></a>00218 *pOut2-- = -(outI << 1u); |
| <a name="l00219"></a>00219 *pOut2-- = (outR << 1u); |
| <a name="l00220"></a>00220 |
| <a name="l00221"></a>00221 <span class="comment">/* update coefficient pointer */</span> |
| <a name="l00222"></a>00222 pCoefB = pCoefB + (modifier * 2u); |
| <a name="l00223"></a>00223 pCoefA = pCoefA + ((modifier * 2u) - 1u); |
| <a name="l00224"></a>00224 |
| <a name="l00225"></a>00225 i--; |
| <a name="l00226"></a>00226 |
| <a name="l00227"></a>00227 } |
| <a name="l00228"></a>00228 |
| <a name="l00229"></a>00229 pDst[2u * fftLen] = pSrc[0] - pSrc[1]; |
| <a name="l00230"></a>00230 pDst[(2u * fftLen) + 1u] = 0; |
| <a name="l00231"></a>00231 |
| <a name="l00232"></a>00232 pDst[0] = pSrc[0] + pSrc[1]; |
| <a name="l00233"></a>00233 pDst[1] = 0; |
| <a name="l00234"></a>00234 |
| <a name="l00235"></a>00235 } |
| <a name="l00236"></a>00236 |
| <a name="l00237"></a>00237 |
| <a name="l00249"></a><a class="code" href="arm__rfft__q31_8c.html#acc62dd39a59091c4d6a80d4e55adeb13">00249</a> <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q31_8c.html#acc62dd39a59091c4d6a80d4e55adeb13" title="Core Real IFFT process.">arm_split_rifft_q31</a>( |
| <a name="l00250"></a>00250 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc, |
| <a name="l00251"></a>00251 uint32_t fftLen, |
| <a name="l00252"></a>00252 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pATable, |
| <a name="l00253"></a>00253 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pBTable, |
| <a name="l00254"></a>00254 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst, |
| <a name="l00255"></a>00255 uint32_t modifier) |
| <a name="l00256"></a>00256 { |
| <a name="l00257"></a>00257 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> outR, outI; <span class="comment">/* Temporary variables for output */</span> |
| <a name="l00258"></a>00258 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pCoefA, *pCoefB; <span class="comment">/* Temporary pointers for twiddle factors */</span> |
| <a name="l00259"></a>00259 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> CoefA1, CoefA2, CoefB1; <span class="comment">/* Temporary variables for twiddle coefficients */</span> |
| <a name="l00260"></a>00260 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pIn1 = &pSrc[0], *pIn2 = &pSrc[(2u * fftLen) + 1u]; |
| <a name="l00261"></a>00261 |
| <a name="l00262"></a>00262 pCoefA = &pATable[0]; |
| <a name="l00263"></a>00263 pCoefB = &pBTable[0]; |
| <a name="l00264"></a>00264 |
| <a name="l00265"></a>00265 <span class="keywordflow">while</span>(fftLen > 0u) |
| <a name="l00266"></a>00266 { |
| <a name="l00267"></a>00267 <span class="comment">/* </span> |
| <a name="l00268"></a>00268 <span class="comment"> outR = (pIn[2 * i] * pATable[2 * i] + pIn[2 * i + 1] * pATable[2 * i + 1] + </span> |
| <a name="l00269"></a>00269 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i] - </span> |
| <a name="l00270"></a>00270 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span> |
| <a name="l00271"></a>00271 <span class="comment"></span> |
| <a name="l00272"></a>00272 <span class="comment"> outI = (pIn[2 * i + 1] * pATable[2 * i] - pIn[2 * i] * pATable[2 * i + 1] - </span> |
| <a name="l00273"></a>00273 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span> |
| <a name="l00274"></a>00274 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); </span> |
| <a name="l00275"></a>00275 <span class="comment"></span> |
| <a name="l00276"></a>00276 <span class="comment"> */</span> |
| <a name="l00277"></a>00277 CoefA1 = *pCoefA++; |
| <a name="l00278"></a>00278 CoefA2 = *pCoefA; |
| <a name="l00279"></a>00279 |
| <a name="l00280"></a>00280 <span class="comment">/* outR = (pIn[2 * i] * pATable[2 * i] */</span> |
| <a name="l00281"></a>00281 outR = ((int32_t) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn1 * CoefA1) >> 32)); |
| <a name="l00282"></a>00282 |
| <a name="l00283"></a>00283 <span class="comment">/* - pIn[2 * i] * pATable[2 * i + 1] */</span> |
| <a name="l00284"></a>00284 outI = -((int32_t) (((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn1++ * CoefA2) >> 32)); |
| <a name="l00285"></a>00285 |
| <a name="l00286"></a>00286 <span class="comment">/* pIn[2 * i + 1] * pATable[2 * i + 1] */</span> |
| <a name="l00287"></a>00287 outR = |
| <a name="l00288"></a>00288 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((q63_t) * pIn1 * (CoefA2))) >> 32); |
| <a name="l00289"></a>00289 |
| <a name="l00290"></a>00290 <span class="comment">/* pIn[2 * i + 1] * pATable[2 * i] */</span> |
| <a name="l00291"></a>00291 outI = |
| <a name="l00292"></a>00292 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) + ((q63_t) * pIn1++ * (CoefA1))) >> 32); |
| <a name="l00293"></a>00293 |
| <a name="l00294"></a>00294 <span class="comment">/* pIn[2 * n - 2 * i] * pBTable[2 * i] */</span> |
| <a name="l00295"></a>00295 outR = |
| <a name="l00296"></a>00296 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((q63_t) * pIn2 * (CoefA2))) >> 32); |
| <a name="l00297"></a>00297 |
| <a name="l00298"></a>00298 CoefB1 = *pCoefB; |
| <a name="l00299"></a>00299 |
| <a name="l00300"></a>00300 <span class="comment">/* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */</span> |
| <a name="l00301"></a>00301 outI = |
| <a name="l00302"></a>00302 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) - ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn2-- * (CoefB1))) >> 32); |
| <a name="l00303"></a>00303 |
| <a name="l00304"></a>00304 <span class="comment">/* pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */</span> |
| <a name="l00305"></a>00305 outR = |
| <a name="l00306"></a>00306 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outR << 32) + ((q63_t) * pIn2 * (CoefB1))) >> 32); |
| <a name="l00307"></a>00307 |
| <a name="l00308"></a>00308 <span class="comment">/* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */</span> |
| <a name="l00309"></a>00309 outI = |
| <a name="l00310"></a>00310 (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) outI << 32) + ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * pIn2-- * (CoefA2))) >> 32); |
| <a name="l00311"></a>00311 |
| <a name="l00312"></a>00312 <span class="comment">/* write output */</span> |
| <a name="l00313"></a>00313 *pDst++ = (outR << 1u); |
| <a name="l00314"></a>00314 *pDst++ = (outI << 1u); |
| <a name="l00315"></a>00315 |
| <a name="l00316"></a>00316 <span class="comment">/* update coefficient pointer */</span> |
| <a name="l00317"></a>00317 pCoefB = pCoefB + (modifier * 2u); |
| <a name="l00318"></a>00318 pCoefA = pCoefA + ((modifier * 2u) - 1u); |
| <a name="l00319"></a>00319 |
| <a name="l00320"></a>00320 <span class="comment">/* Decrement loop count */</span> |
| <a name="l00321"></a>00321 fftLen--; |
| <a name="l00322"></a>00322 |
| <a name="l00323"></a>00323 } |
| <a name="l00324"></a>00324 |
| <a name="l00325"></a>00325 |
| <a name="l00326"></a>00326 } |
| </pre></div></div> |
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