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49 <div class="headertitle">
50 <h1>arm_mean_f32.c</h1> </div>
52 <div class="contents">
53 <a href="arm__mean__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 <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span>
55 <a name="l00003"></a>00003 <span class="comment">* </span>
56 <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span>
57 <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span>
58 <a name="l00006"></a>00006 <span class="comment">* </span>
59 <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span>
60 <a name="l00008"></a>00008 <span class="comment">* Title: arm_mean_f32.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Mean value of a floating-point vector. </span>
63 <a name="l00011"></a>00011 <span class="comment">* </span>
64 <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
65 <a name="l00013"></a>00013 <span class="comment">* </span>
66 <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span>
67 <a name="l00015"></a>00015 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span>
68 <a name="l00016"></a>00016 <span class="comment">* </span>
69 <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29 </span>
70 <a name="l00018"></a>00018 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
71 <a name="l00019"></a>00019 <span class="comment">* </span>
72 <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11 </span>
73 <a name="l00021"></a>00021 <span class="comment">* Documentation updated. </span>
74 <a name="l00022"></a>00022 <span class="comment">* </span>
75 <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05 </span>
76 <a name="l00024"></a>00024 <span class="comment">* Production release and review comments incorporated. </span>
77 <a name="l00025"></a>00025 <span class="comment">* </span>
78 <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20 </span>
79 <a name="l00027"></a>00027 <span class="comment">* Production release and review comments incorporated. </span>
80 <a name="l00028"></a>00028 <span class="comment">* ---------------------------------------------------------------------------- */</span>
81 <a name="l00029"></a>00029
82 <a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
83 <a name="l00031"></a>00031
84 <a name="l00064"></a><a class="code" href="group__mean.html#ga74ce08c49ab61e57bd50c3a0ca1fdb2b">00064</a> <span class="keywordtype">void</span> <a class="code" href="group__mean.html#ga74ce08c49ab61e57bd50c3a0ca1fdb2b" title="Mean value of a floating-point vector.">arm_mean_f32</a>(
85 <a name="l00065"></a>00065 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc,
86 <a name="l00066"></a>00066 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>,
87 <a name="l00067"></a>00067 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pResult)
88 <a name="l00068"></a>00068 {
89 <a name="l00069"></a>00069 <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">/* Temporary result storage */</span>
90 <a name="l00070"></a>00070 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
91 <a name="l00071"></a>00071
92 <a name="l00072"></a>00072 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
93 <a name="l00073"></a>00073 <span class="preprocessor"></span>
94 <a name="l00074"></a>00074 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
95 <a name="l00075"></a>00075
96 <a name="l00076"></a>00076 <span class="comment">/*loop Unrolling */</span>
97 <a name="l00077"></a>00077 blkCnt = blockSize >> 2u;
98 <a name="l00078"></a>00078
99 <a name="l00079"></a>00079 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
100 <a name="l00080"></a>00080 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
101 <a name="l00081"></a>00081 <span class="keywordflow">while</span>(blkCnt > 0u)
102 <a name="l00082"></a>00082 {
103 <a name="l00083"></a>00083 <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */</span>
104 <a name="l00084"></a>00084 sum += *pSrc++;
105 <a name="l00085"></a>00085 sum += *pSrc++;
106 <a name="l00086"></a>00086 sum += *pSrc++;
107 <a name="l00087"></a>00087 sum += *pSrc++;
108 <a name="l00088"></a>00088
109 <a name="l00089"></a>00089 <span class="comment">/* Decrement the loop counter */</span>
110 <a name="l00090"></a>00090 blkCnt--;
111 <a name="l00091"></a>00091 }
112 <a name="l00092"></a>00092
113 <a name="l00093"></a>00093 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span>
114 <a name="l00094"></a>00094 <span class="comment"> ** No loop unrolling is used. */</span>
115 <a name="l00095"></a>00095 blkCnt = blockSize % 0x4u;
116 <a name="l00096"></a>00096
117 <a name="l00097"></a>00097 <span class="preprocessor">#else</span>
118 <a name="l00098"></a>00098 <span class="preprocessor"></span>
119 <a name="l00099"></a>00099 <span class="comment">/* Run the below code for Cortex-M0 */</span>
120 <a name="l00100"></a>00100
121 <a name="l00101"></a>00101 <span class="comment">/* Loop over blockSize number of values */</span>
122 <a name="l00102"></a>00102 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
123 <a name="l00103"></a>00103
124 <a name="l00104"></a>00104 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
125 <a name="l00105"></a>00105
126 <a name="l00106"></a>00106 <span class="keywordflow">while</span>(blkCnt > 0u)
127 <a name="l00107"></a>00107 {
128 <a name="l00108"></a>00108 <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */</span>
129 <a name="l00109"></a>00109 sum += *pSrc++;
130 <a name="l00110"></a>00110
131 <a name="l00111"></a>00111 <span class="comment">/* Decrement the loop counter */</span>
132 <a name="l00112"></a>00112 blkCnt--;
133 <a name="l00113"></a>00113 }
134 <a name="l00114"></a>00114
135 <a name="l00115"></a>00115 <span class="comment">/* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */</span>
136 <a name="l00116"></a>00116 <span class="comment">/* Store the result to the destination */</span>
137 <a name="l00117"></a>00117 *pResult = sum / (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>) blockSize;
138 <a name="l00118"></a>00118 }
139 <a name="l00119"></a>00119
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