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/trunc/src/STM32F4-Discovery-Firmware-Makefile/Libraries/CMSIS/Documentation/DSP_Lib/html/arm__rms__f32_8c_source.html

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    50. 

  50. <h1>arm_rms_f32.c</h1>  </div>
    51. 

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  52. <div class="contents">
    53. 

  53. <a href="arm__rms__f32_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>
    54. 

  54. <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved.   </span>
    55. 

  55. <a name="l00003"></a>00003 <span class="comment">*   </span>
    56. 

  56. <a name="l00004"></a>00004 <span class="comment">* $Date:        15. July 2011  </span>
    57. 

  57. <a name="l00005"></a>00005 <span class="comment">* $Revision:    V1.0.10  </span>
    58. 

  58. <a name="l00006"></a>00006 <span class="comment">*   </span>
    59. 

  59. <a name="l00007"></a>00007 <span class="comment">* Project:      CMSIS DSP Library   </span>
    60. 

  60. <a name="l00008"></a>00008 <span class="comment">* Title:        arm_rms_f32.c   </span>
    61. 

  61. <a name="l00009"></a>00009 <span class="comment">*   </span>
    62. 

  62. <a name="l00010"></a>00010 <span class="comment">* Description:  Root mean square value of an array of F32 type   </span>
    63. 

  63. <a name="l00011"></a>00011 <span class="comment">*   </span>
    64. 

  64. <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
    65. 

  65. <a name="l00013"></a>00013 <span class="comment">*  </span>
    66. 

  66. <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
    67. 

  67. <a name="l00015"></a>00015 <span class="comment">*    Big Endian support added and Merged M0 and M3/M4 Source code.  </span>
    68. 

  68. <a name="l00016"></a>00016 <span class="comment">*   </span>
    69. 

  69. <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29  </span>
    70. 

  70. <a name="l00018"></a>00018 <span class="comment">*    Re-organized the CMSIS folders and updated documentation.   </span>
    71. 

  71. <a name="l00019"></a>00019 <span class="comment">*    </span>
    72. 

  72. <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11   </span>
    73. 

  73. <a name="l00021"></a>00021 <span class="comment">*    Documentation updated.    </span>
    74. 

  74. <a name="l00022"></a>00022 <span class="comment">*   </span>
    75. 

  75. <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05    </span>
    76. 

  76. <a name="l00024"></a>00024 <span class="comment">*    Production release and review comments incorporated.   </span>
    77. 

  77. <a name="l00025"></a>00025 <span class="comment">*   </span>
    78. 

  78. <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20    </span>
    79. 

  79. <a name="l00027"></a>00027 <span class="comment">*    Production release and review comments incorporated.   </span>
    80. 

  80. <a name="l00028"></a>00028 <span class="comment">* ---------------------------------------------------------------------------- */</span>
    81. 

  81. <a name="l00029"></a>00029 
    82. 

  82. <a name="l00030"></a>00030 <span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
    83. 

  83. <a name="l00031"></a>00031 
    84. 

  84. <a name="l00065"></a><a class="code" href="group___r_m_s.html#ga0e3ab1b57da32d45388d1fa90d7fd88c">00065</a> <span class="keywordtype">void</span> <a class="code" href="group___r_m_s.html#ga0e3ab1b57da32d45388d1fa90d7fd88c" title="Root Mean Square of the elements of a floating-point vector.">arm_rms_f32</a>(
    85. 

  85. <a name="l00066"></a>00066   <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc,
    86. 

  86. <a name="l00067"></a>00067   uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>,
    87. 

  87. <a name="l00068"></a>00068   <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pResult)
    88. 

  88. <a name="l00069"></a>00069 {
    89. 

  89. <a name="l00070"></a>00070   <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> sum = 0.0f;                          <span class="comment">/* Accumulator */</span>
    90. 

  90. <a name="l00071"></a>00071   <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> in;                                  <span class="comment">/* Tempoprary variable to store input value */</span>
    91. 

  91. <a name="l00072"></a>00072   uint32_t blkCnt;                               <span class="comment">/* loop counter */</span>
    92. 

  92. <a name="l00073"></a>00073 
    93. 

  93. <a name="l00074"></a>00074 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
    94. 

  94. <a name="l00075"></a>00075 <span class="preprocessor"></span>
    95. 

  95. <a name="l00076"></a>00076   <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
    96. 

  96. <a name="l00077"></a>00077 
    97. 

  97. <a name="l00078"></a>00078   <span class="comment">/* loop Unrolling */</span>
    98. 

  98. <a name="l00079"></a>00079   blkCnt = blockSize &gt;&gt; 2u;
    99. 

  99. <a name="l00080"></a>00080 
    100. 

  100. <a name="l00081"></a>00081   <span class="comment">/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.   </span>
    101. 

  101. <a name="l00082"></a>00082 <span class="comment">   ** a second loop below computes the remaining 1 to 3 samples. */</span>
    102. 

  102. <a name="l00083"></a>00083   <span class="keywordflow">while</span>(blkCnt &gt; 0u)
    103. 

  103. <a name="l00084"></a>00084   {
    104. 

  104. <a name="l00085"></a>00085     <span class="comment">/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */</span>
    105. 

  105. <a name="l00086"></a>00086     <span class="comment">/* Compute sum of the squares and then store the result in a temporary variable, sum  */</span>
    106. 

  106. <a name="l00087"></a>00087     in = *pSrc++;
    107. 

  107. <a name="l00088"></a>00088     sum += in * in;
    108. 

  108. <a name="l00089"></a>00089     in = *pSrc++;
    109. 

  109. <a name="l00090"></a>00090     sum += in * in;
    110. 

  110. <a name="l00091"></a>00091     in = *pSrc++;
    111. 

  111. <a name="l00092"></a>00092     sum += in * in;
    112. 

  112. <a name="l00093"></a>00093     in = *pSrc++;
    113. 

  113. <a name="l00094"></a>00094     sum += in * in;
    114. 

  114. <a name="l00095"></a>00095 
    115. 

  115. <a name="l00096"></a>00096     <span class="comment">/* Decrement the loop counter */</span>
    116. 

  116. <a name="l00097"></a>00097     blkCnt--;
    117. 

  117. <a name="l00098"></a>00098   }
    118. 

  118. <a name="l00099"></a>00099 
    119. 

  119. <a name="l00100"></a>00100   <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here.   </span>
    120. 

  120. <a name="l00101"></a>00101 <span class="comment">   ** No loop unrolling is used. */</span>
    121. 

  121. <a name="l00102"></a>00102   blkCnt = blockSize % 0x4u;
    122. 

  122. <a name="l00103"></a>00103 
    123. 

  123. <a name="l00104"></a>00104 <span class="preprocessor">#else</span>
    124. 

  124. <a name="l00105"></a>00105 <span class="preprocessor"></span>
    125. 

  125. <a name="l00106"></a>00106   <span class="comment">/* Run the below code for Cortex-M0 */</span>
    126. 

  126. <a name="l00107"></a>00107 
    127. 

  127. <a name="l00108"></a>00108   <span class="comment">/* Loop over blockSize number of values */</span>
    128. 

  128. <a name="l00109"></a>00109   blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
    129. 

  129. <a name="l00110"></a>00110 
    130. 

  130. <a name="l00111"></a>00111 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
    131. 

  131. <a name="l00112"></a>00112 
    132. 

  132. <a name="l00113"></a>00113   <span class="keywordflow">while</span>(blkCnt &gt; 0u)
    133. 

  133. <a name="l00114"></a>00114   {
    134. 

  134. <a name="l00115"></a>00115     <span class="comment">/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */</span>
    135. 

  135. <a name="l00116"></a>00116     <span class="comment">/* Compute sum of the squares and then store the results in a temporary variable, sum  */</span>
    136. 

  136. <a name="l00117"></a>00117     in = *pSrc++;
    137. 

  137. <a name="l00118"></a>00118     sum += in * in;
    138. 

  138. <a name="l00119"></a>00119 
    139. 

  139. <a name="l00120"></a>00120     <span class="comment">/* Decrement the loop counter */</span>
    140. 

  140. <a name="l00121"></a>00121     blkCnt--;
    141. 

  141. <a name="l00122"></a>00122   }
    142. 

  142. <a name="l00123"></a>00123 
    143. 

  143. <a name="l00124"></a>00124   <span class="comment">/* Compute Rms and store the result in the destination */</span>
    144. 

  144. <a name="l00125"></a>00125   <a class="code" href="group___s_q_r_t.html#ga56a40d1cf842b0b45267df6761975da0" title="Floating-point square root function.">arm_sqrt_f32</a>(sum / (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>) blockSize, pResult);
    145. 

  145. <a name="l00126"></a>00126 }
    146. 

  146. <a name="l00127"></a>00127 
    147. 

  147. </pre></div></div>
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