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  45 <h1>arm_variance_example_f32.c</h1>  </div>
  46 </div>
  47 <div class="contents">
  48 <div class="fragment"><pre class="fragment"><span class="comment">/* ----------------------------------------------------------------------    </span>
  49 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved.     </span>
  50 <span class="comment">*    </span>
  51 <span class="comment">* $Date:        29. November 2010  </span>
  52 <span class="comment">* $Revision:    V1.0.3</span>
  53 <span class="comment">*     </span>
  54 <span class="comment">* Project:      CMSIS DSP Library  </span>
  55 <span class="comment">* Title:        arm_variance_example_f32.c       </span>
  56 <span class="comment">* </span>
  57 <span class="comment">* Description:  Example code demonstrating variance calculation of input sequence.</span>
  58 <span class="comment">*     </span>
  59 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3  </span>
  60 <span class="comment">*</span>
  61 <span class="comment">*</span>
  62 <span class="comment">* Version 1.0.3 2010/11/29 </span>
  63 <span class="comment">*    Re-organized the CMSIS folders and updated documentation. </span>
  64 <span class="comment">* </span>
  65 <span class="comment">* Version 1.0.1 2010/10/05 KK </span>
  66 <span class="comment">*    Production release and review comments incorporated.  </span>
  67 <span class="comment">*</span>
  68 <span class="comment">* Version 1.0.0 2010/09/20 KK</span>
  69 <span class="comment">*    Production release and review comments incorporated.</span>
  70 <span class="comment">* ------------------------------------------------------------------- */</span>
  71
  72 <span class="preprocessor">#include &lt;math.h&gt;</span>
  73 <span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
  74
  75 <span class="comment">/* ----------------------------------------------------------------------</span>
  76 <span class="comment">* Defines each of the tests performed</span>
  77 <span class="comment">* ------------------------------------------------------------------- */</span>
  78 <span class="preprocessor">#define MAX_BLOCKSIZE   32</span>
  79 <span class="preprocessor"></span><span class="preprocessor">#define DELTA           (0.000001f)</span>
  80 <span class="preprocessor"></span>
  81
  82 <span class="comment">/* ----------------------------------------------------------------------</span>
  83 <span class="comment">* Declare I/O buffers </span>
  84 <span class="comment">* ------------------------------------------------------------------- */</span>
  85 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a0"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>[<a name="a1"></a><a class="code" href="arm__convolution__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];
  86 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a2"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>[<a class="code" href="arm__convolution__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];
  87 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a3"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>[<a class="code" href="arm__convolution__example__f32_8c.html#af8a1d2ed31f7c9a00fec46a798edb61b">MAX_BLOCKSIZE</a>];
  88
  89 <span class="comment">/* ----------------------------------------------------------------------</span>
  90 <span class="comment">* Test input data for Floating point Variance example for 32-blockSize</span>
  91 <span class="comment">* Generated by the MATLAB randn() function</span>
  92 <span class="comment">* ------------------------------------------------------------------- */</span>
  93
  94 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a4"></a><a class="code" href="arm__graphic__equalizer__example__q31_8c.html#aa4699dc6ee05353c83e0be4e69f6ad05">testInput_f32</a>[32] =
  95 {
  96 -0.432564811528221,     -1.665584378238097,     0.125332306474831,      0.287676420358549,
  97 -1.146471350681464,     1.190915465642999,      1.189164201652103,      -0.037633276593318,
  98 0.327292361408654,      0.174639142820925,      -0.186708577681439,     0.725790548293303,
  99 -0.588316543014189,     2.183185818197101,      -0.136395883086596,     0.113931313520810,
 100 1.066768211359189,      0.059281460523605,      -0.095648405483669,     -0.832349463650022,
 101 0.294410816392640,      -1.336181857937804,     0.714324551818952,      1.623562064446271,
 102 -0.691775701702287,     0.857996672828263,      1.254001421602532,      -1.593729576447477,
 103 -1.440964431901020,     0.571147623658178,      -0.399885577715363,     0.689997375464345
 104
 105 };
 106
 107 <span class="comment">/* ----------------------------------------------------------------------</span>
 108 <span class="comment">* Declare Global variables </span>
 109 <span class="comment">* ------------------------------------------------------------------- */</span>
 110 uint32_t <a name="a5"></a><a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a> = 32;
 111 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>  <a name="a6"></a><a class="code" href="arm__variance__example__f32_8c.html#a26cbbfe2a7905669e8440159465050df">refVarianceOut</a> = 0.903941793931839;
 112
 113 <span class="comment">/* ----------------------------------------------------------------------</span>
 114 <span class="comment">* Variance calculation test</span>
 115 <span class="comment">* ------------------------------------------------------------------- */</span>
 116
 117 int32_t <a name="a7"></a><a class="code" href="arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>)
 118 {
 119     <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a name="a8"></a><a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;
 120     <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a9"></a><a class="code" href="arm__class__marks__example__f32_8c.html#acc9290716b3c97381ce52d14b4b01681">mean</a>, oneByBlockSize;
 121     <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> variance;
 122     <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> diff;
 123
 124     status = <a name="a10"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;
 125
 126     <span class="comment">/* Calculation of mean value of input */</span>
 127
 128     <span class="comment">/* x&#39; = 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1) */</span>
 129
 130     <span class="comment">/* Fill wire1 buffer with 1.0 value */</span>
 131     <a name="a11"></a><a class="code" href="group___fill.html#ga2248e8d3901b4afb7827163132baad94" title="Fills a constant value into a floating-point vector.">arm_fill_f32</a>(1.0,  <a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
 132
 133     <span class="comment">/* Calculate the dot product of wire1 and wire2 */</span>
 134     <span class="comment">/* (x(0)* 1 + x(1) * 1 + ...+ x(n-1) * 1) */</span>
 135     <a name="a12"></a><a class="code" href="group__dot__prod.html#ga55418d4362f6ba84c327f9b4f089a8c3" title="Dot product of floating-point vectors.">arm_dot_prod_f32</a>(<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#aa4699dc6ee05353c83e0be4e69f6ad05">testInput_f32</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, &amp;mean);
 136
 137     <span class="comment">/* Calculation of 1/blockSize */</span>
 138     oneByBlockSize = 1.0 / (<a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
 139
 140     <span class="comment">/* 1/blockSize * (x(0)* 1 + x(1) * 1 + ... + x(n-1) * 1)  */</span>
 141     <a name="a13"></a><a class="code" href="group___basic_mult.html#gaca3f0b8227da431ab29225b88888aa32" title="Floating-point vector multiplication.">arm_mult_f32</a>(&amp;mean, &amp;oneByBlockSize, &amp;mean, 1);
 142
 143
 144     <span class="comment">/* Calculation of variance value of input */</span>
 145
 146     <span class="comment">/* (1/blockSize) * (x(0) - x&#39;) * (x(0) - x&#39;) + (x(1) - x&#39;) * (x(1) - x&#39;) + ... + (x(n-1) - x&#39;) * (x(n-1) - x&#39;) */</span>
 147
 148     <span class="comment">/* Fill wire2 with mean value x&#39; */</span>
 149     <a class="code" href="group___fill.html#ga2248e8d3901b4afb7827163132baad94" title="Fills a constant value into a floating-point vector.">arm_fill_f32</a>(mean,  <a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
 150
 151     <span class="comment">/* wire3 contains (x-x&#39;) */</span>
 152     <a name="a14"></a><a class="code" href="group___basic_sub.html#ga7f975a472de286331134227c08aad826" title="Floating-point vector subtraction.">arm_sub_f32</a>(<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#aa4699dc6ee05353c83e0be4e69f6ad05">testInput_f32</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
 153
 154     <span class="comment">/* wire2 contains (x-x&#39;) */</span>
 155     <a name="a15"></a><a class="code" href="group__copy.html#gadd1f737e677e0e6ca31767c7001417b3" title="Copies the elements of a floating-point vector.">arm_copy_f32</a>(<a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
 156
 157     <span class="comment">/* (x(0) - x&#39;) * (x(0) - x&#39;) + (x(1) - x&#39;) * (x(1) - x&#39;) + ... + (x(n-1) - x&#39;) * (x(n-1) - x&#39;) */</span>
 158     <a class="code" href="group__dot__prod.html#ga55418d4362f6ba84c327f9b4f089a8c3" title="Dot product of floating-point vectors.">arm_dot_prod_f32</a>(<a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, &amp;variance);
 159
 160     <span class="comment">/* Calculation of 1/blockSize */</span>
 161     oneByBlockSize = 1.0 / (<a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a> - 1);
 162
 163     <span class="comment">/* Calculation of variance */</span>
 164     <a class="code" href="group___basic_mult.html#gaca3f0b8227da431ab29225b88888aa32" title="Floating-point vector multiplication.">arm_mult_f32</a>(&amp;variance, &amp;oneByBlockSize, &amp;variance, 1);
 165
 166     <span class="comment">/* absolute value of difference between ref and test */</span>
 167     diff = fabsf(<a class="code" href="arm__variance__example__f32_8c.html#a26cbbfe2a7905669e8440159465050df">refVarianceOut</a> - variance);
 168
 169     <span class="comment">/* Comparison of variance value with reference */</span>
 170     <span class="keywordflow">if</span>(diff &gt; <a name="a16"></a><a class="code" href="arm__convolution__example__f32_8c.html#a3fd2b1bcd7ddcf506237987ad780f495">DELTA</a>)
 171     {
 172         status = <a name="a17"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;
 173     }
 174
 175     <span class="keywordflow">if</span>( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)
 176     {
 177       <span class="keywordflow">while</span>(1);
 178     }
 179 }
 180
 181 </pre></div> </div>
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