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49 <div class="headertitle">
50 <h1>arm_max_q7.c</h1> </div>
52 <div class="contents">
53 <a href="arm__max__q7_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_max_q7.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Maximum value of a Q7 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="l00051"></a><a class="code" href="group___max.html#ga6afd64d381b5c232de59163ebfe71e35">00051</a> <span class="keywordtype">void</span> <a class="code" href="group___max.html#ga6afd64d381b5c232de59163ebfe71e35" title="Maximum value of a Q7 vector.">arm_max_q7</a>(
85 <a name="l00052"></a>00052 <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> * pSrc,
86 <a name="l00053"></a>00053 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>,
87 <a name="l00054"></a>00054 <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> * pResult,
88 <a name="l00055"></a>00055 uint32_t * pIndex)
89 <a name="l00056"></a>00056 {
90 <a name="l00057"></a>00057
91 <a name="l00058"></a>00058 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
92 <a name="l00059"></a>00059 <span class="preprocessor"></span>
93 <a name="l00060"></a>00060 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
94 <a name="l00061"></a>00061
95 <a name="l00062"></a>00062 <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> res, maxVal, x0, x1, maxVal2, maxVal1; <span class="comment">/* Temporary variables to store the output value. */</span>
96 <a name="l00063"></a>00063 uint32_t blkCnt, index1, index2, index3, indx, indxMod; <span class="comment">/* loop counter */</span>
97 <a name="l00064"></a>00064
98 <a name="l00065"></a>00065 <span class="comment">/* Initialise the index value to zero. */</span>
99 <a name="l00066"></a>00066 indx = 0u;
100 <a name="l00067"></a>00067
101 <a name="l00068"></a>00068 <span class="comment">/* Load first input value that act as reference value for comparision */</span>
102 <a name="l00069"></a>00069 res = *pSrc++;
103 <a name="l00070"></a>00070
104 <a name="l00071"></a>00071 <span class="comment">/* Loop unrolling */</span>
105 <a name="l00072"></a>00072 blkCnt = (blockSize - 1u) >> 2u;
106 <a name="l00073"></a>00073
107 <a name="l00074"></a>00074 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
108 <a name="l00075"></a>00075 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
109 <a name="l00076"></a>00076 <span class="keywordflow">while</span>(blkCnt > 0u)
110 <a name="l00077"></a>00077 {
111 <a name="l00078"></a>00078 indxMod = blockSize - (blkCnt * 4u);
112 <a name="l00079"></a>00079
113 <a name="l00080"></a>00080 <span class="comment">/* Load two input values for comparision */</span>
114 <a name="l00081"></a>00081 x0 = *pSrc++;
115 <a name="l00082"></a>00082 x1 = *pSrc++;
116 <a name="l00083"></a>00083
117 <a name="l00084"></a>00084 <span class="keywordflow">if</span>(x0 < x1)
118 <a name="l00085"></a>00085 {
119 <a name="l00086"></a>00086 <span class="comment">/* Update the maximum value and its index */</span>
120 <a name="l00087"></a>00087 maxVal1 = x1;
121 <a name="l00088"></a>00088 index1 = indxMod + 1u;
122 <a name="l00089"></a>00089 }
123 <a name="l00090"></a>00090 <span class="keywordflow">else</span>
124 <a name="l00091"></a>00091 {
125 <a name="l00092"></a>00092 <span class="comment">/* Update the maximum value and its index */</span>
126 <a name="l00093"></a>00093 maxVal1 = x0;
127 <a name="l00094"></a>00094 index1 = indxMod;
128 <a name="l00095"></a>00095 }
129 <a name="l00096"></a>00096
130 <a name="l00097"></a>00097 <span class="comment">/* Load two input values for comparision */</span>
131 <a name="l00098"></a>00098 x0 = *pSrc++;
132 <a name="l00099"></a>00099 x1 = *pSrc++;
133 <a name="l00100"></a>00100
134 <a name="l00101"></a>00101 <span class="keywordflow">if</span>(x0 < x1)
135 <a name="l00102"></a>00102 {
136 <a name="l00103"></a>00103 <span class="comment">/* Update the maximum value and its index */</span>
137 <a name="l00104"></a>00104 maxVal2 = x1;
138 <a name="l00105"></a>00105 index2 = indxMod + 3u;
139 <a name="l00106"></a>00106 }
140 <a name="l00107"></a>00107 <span class="keywordflow">else</span>
141 <a name="l00108"></a>00108 {
142 <a name="l00109"></a>00109 <span class="comment">/* Update the maximum value and its index */</span>
143 <a name="l00110"></a>00110 maxVal2 = x0;
144 <a name="l00111"></a>00111 index2 = indxMod + 2u;
145 <a name="l00112"></a>00112 }
146 <a name="l00113"></a>00113
147 <a name="l00114"></a>00114 <span class="keywordflow">if</span>(maxVal1 < maxVal2)
148 <a name="l00115"></a>00115 {
149 <a name="l00116"></a>00116 <span class="comment">/* Update the maximum value and its index */</span>
150 <a name="l00117"></a>00117 maxVal = maxVal2;
151 <a name="l00118"></a>00118 index3 = index2;
152 <a name="l00119"></a>00119 }
153 <a name="l00120"></a>00120 <span class="keywordflow">else</span>
154 <a name="l00121"></a>00121 {
155 <a name="l00122"></a>00122 <span class="comment">/* Update the maximum value and its index */</span>
156 <a name="l00123"></a>00123 maxVal = maxVal1;
157 <a name="l00124"></a>00124 index3 = index1;
158 <a name="l00125"></a>00125 }
159 <a name="l00126"></a>00126
160 <a name="l00127"></a>00127 <span class="keywordflow">if</span>(res < maxVal)
161 <a name="l00128"></a>00128 {
162 <a name="l00129"></a>00129 <span class="comment">/* Update the maximum value and its index */</span>
163 <a name="l00130"></a>00130 res = maxVal;
164 <a name="l00131"></a>00131 indx = index3;
165 <a name="l00132"></a>00132 }
166 <a name="l00133"></a>00133
167 <a name="l00134"></a>00134 <span class="comment">/* Decrement the loop counter */</span>
168 <a name="l00135"></a>00135 blkCnt--;
169 <a name="l00136"></a>00136
170 <a name="l00137"></a>00137 }
171 <a name="l00138"></a>00138
172 <a name="l00139"></a>00139 <span class="comment">/* If the blockSize - 1 is not a multiple of 4, compute any remaining output samples here. </span>
173 <a name="l00140"></a>00140 <span class="comment"> ** No loop unrolling is used. */</span>
174 <a name="l00141"></a>00141 blkCnt = (blockSize - 1u) % 0x04u;
175 <a name="l00142"></a>00142
176 <a name="l00143"></a>00143 <span class="keywordflow">while</span>(blkCnt > 0u)
177 <a name="l00144"></a>00144 {
178 <a name="l00145"></a>00145 <span class="comment">/* Initialize maxVal to the next consecutive values one by one */</span>
179 <a name="l00146"></a>00146 maxVal = *pSrc++;
180 <a name="l00147"></a>00147
181 <a name="l00148"></a>00148 <span class="comment">/* compare for the maximum value */</span>
182 <a name="l00149"></a>00149 <span class="keywordflow">if</span>(res < maxVal)
183 <a name="l00150"></a>00150 {
184 <a name="l00151"></a>00151 <span class="comment">/* Update the maximum value and its index */</span>
185 <a name="l00152"></a>00152 res = maxVal;
186 <a name="l00153"></a>00153 indx = blockSize - blkCnt;
187 <a name="l00154"></a>00154 }
188 <a name="l00155"></a>00155
189 <a name="l00156"></a>00156 <span class="comment">/* Decrement the loop counter */</span>
190 <a name="l00157"></a>00157 blkCnt--;
191 <a name="l00158"></a>00158 }
192 <a name="l00159"></a>00159
193 <a name="l00160"></a>00160 <span class="comment">/* Store the maximum value and its index into destination pointers */</span>
194 <a name="l00161"></a>00161 *pResult = res;
195 <a name="l00162"></a>00162 *pIndex = indx;
196 <a name="l00163"></a>00163
197 <a name="l00164"></a>00164 <span class="preprocessor">#else</span>
198 <a name="l00165"></a>00165 <span class="preprocessor"></span>
199 <a name="l00166"></a>00166 <span class="comment">/* Run the below code for Cortex-M0 */</span>
200 <a name="l00167"></a>00167
201 <a name="l00168"></a>00168 <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> maxVal, out; <span class="comment">/* Temporary variables to store the output value. */</span>
202 <a name="l00169"></a>00169 uint32_t blkCnt, outIndex; <span class="comment">/* loop counter */</span>
203 <a name="l00170"></a>00170
204 <a name="l00171"></a>00171 <span class="comment">/* Initialise the index value to zero. */</span>
205 <a name="l00172"></a>00172 outIndex = 0u;
206 <a name="l00173"></a>00173 <span class="comment">/* Load first input value that act as reference value for comparision */</span>
207 <a name="l00174"></a>00174 out = *pSrc++;
208 <a name="l00175"></a>00175
209 <a name="l00176"></a>00176 <span class="comment">/* Loop over blockSize - 1 number of values */</span>
210 <a name="l00177"></a>00177 blkCnt = (blockSize - 1u);
211 <a name="l00178"></a>00178
212 <a name="l00179"></a>00179 <span class="keywordflow">while</span>(blkCnt > 0u)
213 <a name="l00180"></a>00180 {
214 <a name="l00181"></a>00181 <span class="comment">/* Initialize maxVal to the next consecutive values one by one */</span>
215 <a name="l00182"></a>00182 maxVal = *pSrc++;
216 <a name="l00183"></a>00183
217 <a name="l00184"></a>00184 <span class="comment">/* compare for the maximum value */</span>
218 <a name="l00185"></a>00185 <span class="keywordflow">if</span>(out < maxVal)
219 <a name="l00186"></a>00186 {
220 <a name="l00187"></a>00187 <span class="comment">/* Update the maximum value and its index */</span>
221 <a name="l00188"></a>00188 out = maxVal;
222 <a name="l00189"></a>00189 outIndex = blockSize - blkCnt;
223 <a name="l00190"></a>00190 }
224 <a name="l00191"></a>00191 <span class="comment">/* Decrement the loop counter */</span>
225 <a name="l00192"></a>00192 blkCnt--;
226 <a name="l00193"></a>00193
227 <a name="l00194"></a>00194 }
228 <a name="l00195"></a>00195
229 <a name="l00196"></a>00196 <span class="comment">/* Store the maximum value and its index into destination pointers */</span>
230 <a name="l00197"></a>00197 *pResult = out;
231 <a name="l00198"></a>00198 *pIndex = outIndex;
232 <a name="l00199"></a>00199
233 <a name="l00200"></a>00200 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
234 <a name="l00201"></a>00201
235 <a name="l00202"></a>00202 }
236 <a name="l00203"></a>00203
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