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  <h1>arm_mean_q31.c</h1>  </div>
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  <a href="arm__mean__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_mean_q31.c   </span>
  <a name="l00009"></a>00009 <span class="comment">*   </span>
  <a name="l00010"></a>00010 <span class="comment">* Description:  Mean value of a Q31 vector.  </span>
  <a name="l00011"></a>00011 <span class="comment">*   </span>
  <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
  <a name="l00013"></a>00013 <span class="comment">*  </span>
  <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
  <a name="l00015"></a>00015 <span class="comment">*    Big Endian support added and Merged M0 and M3/M4 Source code.  </span>
  <a name="l00016"></a>00016 <span class="comment">*   </span>
  <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29  </span>
  <a name="l00018"></a>00018 <span class="comment">*    Re-organized the CMSIS folders and updated documentation.   </span>
  <a name="l00019"></a>00019 <span class="comment">*    </span>
  <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11   </span>
  <a name="l00021"></a>00021 <span class="comment">*    Documentation updated.    </span>
  <a name="l00022"></a>00022 <span class="comment">*   </span>
  <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05    </span>
  <a name="l00024"></a>00024 <span class="comment">*    Production release and review comments incorporated.   </span>
  <a name="l00025"></a>00025 <span class="comment">*   </span>
  <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20    </span>
  <a name="l00027"></a>00027 <span class="comment">*    Production release and review comments incorporated.   </span>
  <a name="l00028"></a>00028 <span class="comment">* -------------------------------------------------------------------- */</span>
  <a name="l00029"></a>00029 
  <a name="l00030"></a>00030 <span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
  <a name="l00031"></a>00031 
  <a name="l00061"></a><a class="code" href="group__mean.html#gacf2526d8c2d75e486e8f0b0e31877ad0">00061</a> <span class="keywordtype">void</span> <a class="code" href="group__mean.html#gacf2526d8c2d75e486e8f0b0e31877ad0" title="Mean value of a Q31 vector.">arm_mean_q31</a>(
  <a name="l00062"></a>00062   <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="l00063"></a>00063   uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>,
  <a name="l00064"></a>00064   <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pResult)
  <a name="l00065"></a>00065 {
  <a name="l00066"></a>00066   <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> sum = 0;                                 <span class="comment">/* Temporary result storage */</span>
  <a name="l00067"></a>00067   uint32_t blkCnt;                               <span class="comment">/* loop counter */</span>
  <a name="l00068"></a>00068 
  <a name="l00069"></a>00069 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
  <a name="l00070"></a>00070 <span class="preprocessor"></span>
  <a name="l00071"></a>00071   <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
  <a name="l00072"></a>00072 
  <a name="l00073"></a>00073   <span class="comment">/*loop Unrolling */</span>
  <a name="l00074"></a>00074   blkCnt = blockSize &gt;&gt; 2u;
  <a name="l00075"></a>00075 
  <a name="l00076"></a>00076   <span class="comment">/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.   </span>
  <a name="l00077"></a>00077 <span class="comment">   ** a second loop below computes the remaining 1 to 3 samples. */</span>
  <a name="l00078"></a>00078   <span class="keywordflow">while</span>(blkCnt &gt; 0u)
  <a name="l00079"></a>00079   {
  <a name="l00080"></a>00080     <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */</span>
  <a name="l00081"></a>00081     sum += *pSrc++;
  <a name="l00082"></a>00082     sum += *pSrc++;
  <a name="l00083"></a>00083     sum += *pSrc++;
  <a name="l00084"></a>00084     sum += *pSrc++;
  <a name="l00085"></a>00085 
  <a name="l00086"></a>00086     <span class="comment">/* Decrement the loop counter */</span>
  <a name="l00087"></a>00087     blkCnt--;
  <a name="l00088"></a>00088   }
  <a name="l00089"></a>00089 
  <a name="l00090"></a>00090   <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here.   </span>
  <a name="l00091"></a>00091 <span class="comment">   ** No loop unrolling is used. */</span>
  <a name="l00092"></a>00092   blkCnt = blockSize % 0x4u;
  <a name="l00093"></a>00093 
  <a name="l00094"></a>00094 <span class="preprocessor">#else</span>
  <a name="l00095"></a>00095 <span class="preprocessor"></span>
  <a name="l00096"></a>00096   <span class="comment">/* Run the below code for Cortex-M0 */</span>
  <a name="l00097"></a>00097 
  <a name="l00098"></a>00098   <span class="comment">/* Loop over blockSize number of values */</span>
  <a name="l00099"></a>00099   blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
  <a name="l00100"></a>00100 
  <a name="l00101"></a>00101 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
  <a name="l00102"></a>00102 
  <a name="l00103"></a>00103   <span class="keywordflow">while</span>(blkCnt &gt; 0u)
  <a name="l00104"></a>00104   {
  <a name="l00105"></a>00105     <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */</span>
  <a name="l00106"></a>00106     sum += *pSrc++;
  <a name="l00107"></a>00107 
  <a name="l00108"></a>00108     <span class="comment">/* Decrement the loop counter */</span>
  <a name="l00109"></a>00109     blkCnt--;
  <a name="l00110"></a>00110   }
  <a name="l00111"></a>00111 
  <a name="l00112"></a>00112   <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize  */</span>
  <a name="l00113"></a>00113   <span class="comment">/* Store the result to the destination */</span>
  <a name="l00114"></a>00114   *pResult = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (sum / (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
  <a name="l00115"></a>00115 }
  <a name="l00116"></a>00116 
  </pre></div></div>
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