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49 <div class="headertitle">
50 <h1>arm_scale_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__scale__q15_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_scale_q15.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Multiplies a Q15 vector by a scalar. </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 <span class="comment">* Version 0.0.7 2010/06/10 </span>
82 <a name="l00030"></a>00030 <span class="comment">* Misra-C changes done </span>
83 <a name="l00031"></a>00031 <span class="comment">* -------------------------------------------------------------------- */</span>
84 <a name="l00032"></a>00032
85 <a name="l00033"></a>00033 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
86 <a name="l00034"></a>00034
87 <a name="l00060"></a><a class="code" href="group__scale.html#gafaac0e1927daffeb68a42719b53ea780">00060</a> <span class="keywordtype">void</span> <a class="code" href="group__scale.html#gafaac0e1927daffeb68a42719b53ea780" title="Multiplies a Q15 vector by a scalar.">arm_scale_q15</a>(
88 <a name="l00061"></a>00061 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
89 <a name="l00062"></a>00062 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> scaleFract,
90 <a name="l00063"></a>00063 int8_t shift,
91 <a name="l00064"></a>00064 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
92 <a name="l00065"></a>00065 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
93 <a name="l00066"></a>00066 {
94 <a name="l00067"></a>00067 int8_t kShift = 15 - shift; <span class="comment">/* shift to apply after scaling */</span>
95 <a name="l00068"></a>00068 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
96 <a name="l00069"></a>00069
97 <a name="l00070"></a>00070 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
98 <a name="l00071"></a>00071 <span class="preprocessor"></span>
99 <a name="l00072"></a>00072 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
100 <a name="l00073"></a>00073
101 <a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> in1, in2; <span class="comment">/* Temporary variables */</span>
102 <a name="l00075"></a>00075
103 <a name="l00076"></a>00076
104 <a name="l00077"></a>00077 <span class="comment">/*loop Unrolling */</span>
105 <a name="l00078"></a>00078 blkCnt = blockSize >> 2u;
106 <a name="l00079"></a>00079
107 <a name="l00080"></a>00080 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
108 <a name="l00081"></a>00081 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
109 <a name="l00082"></a>00082 <span class="keywordflow">while</span>(blkCnt > 0u)
110 <a name="l00083"></a>00083 {
111 <a name="l00084"></a>00084 <span class="comment">/* Reading 2 inputs from memory */</span>
112 <a name="l00085"></a>00085 in1 = *pSrc++;
113 <a name="l00086"></a>00086 in2 = *pSrc++;
114 <a name="l00087"></a>00087 <span class="comment">/* C = A * scale */</span>
115 <a name="l00088"></a>00088 <span class="comment">/* Scale the inputs and then store the 2 results in the destination buffer </span>
116 <a name="l00089"></a>00089 <span class="comment"> * in single cycle by packing the outputs */</span>
117 <a name="l00090"></a>00090 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
118 <a name="l00091"></a>00091 <span class="preprocessor"></span>
119 <a name="l00092"></a>00092 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst)++ =
120 <a name="l00093"></a>00093 __PKHBT(__SSAT((in1 * scaleFract) >> kShift, 16),
121 <a name="l00094"></a>00094 __SSAT((in2 * scaleFract) >> kShift, 16), 16);
122 <a name="l00095"></a>00095
123 <a name="l00096"></a>00096 <span class="preprocessor">#else</span>
124 <a name="l00097"></a>00097 <span class="preprocessor"></span>
125 <a name="l00098"></a>00098 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst)++ =
126 <a name="l00099"></a>00099 __PKHBT(__SSAT((in2 * scaleFract) >> kShift, 16),
127 <a name="l00100"></a>00100 __SSAT((in1 * scaleFract) >> kShift, 16), 16);
128 <a name="l00101"></a>00101
129 <a name="l00102"></a>00102 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
130 <a name="l00103"></a>00103
131 <a name="l00104"></a>00104 in1 = *pSrc++;
132 <a name="l00105"></a>00105 in2 = *pSrc++;
133 <a name="l00106"></a>00106
134 <a name="l00107"></a>00107 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
135 <a name="l00108"></a>00108 <span class="preprocessor"></span>
136 <a name="l00109"></a>00109 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst)++ =
137 <a name="l00110"></a>00110 __PKHBT(__SSAT((in1 * scaleFract) >> kShift, 16),
138 <a name="l00111"></a>00111 __SSAT((in2 * scaleFract) >> kShift, 16), 16);
139 <a name="l00112"></a>00112
140 <a name="l00113"></a>00113 <span class="preprocessor">#else</span>
141 <a name="l00114"></a>00114 <span class="preprocessor"></span>
142 <a name="l00115"></a>00115 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst)++ =
143 <a name="l00116"></a>00116 __PKHBT(__SSAT((in2 * scaleFract) >> kShift, 16),
144 <a name="l00117"></a>00117 __SSAT((in1 * scaleFract) >> kShift, 16), 16);
145 <a name="l00118"></a>00118
146 <a name="l00119"></a>00119 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
147 <a name="l00120"></a>00120
148 <a name="l00121"></a>00121 <span class="comment">/* Decrement the loop counter */</span>
149 <a name="l00122"></a>00122 blkCnt--;
150 <a name="l00123"></a>00123 }
151 <a name="l00124"></a>00124
152 <a name="l00125"></a>00125 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span>
153 <a name="l00126"></a>00126 <span class="comment"> ** No loop unrolling is used. */</span>
154 <a name="l00127"></a>00127 blkCnt = blockSize % 0x4u;
155 <a name="l00128"></a>00128
156 <a name="l00129"></a>00129 <span class="keywordflow">while</span>(blkCnt > 0u)
157 <a name="l00130"></a>00130 {
158 <a name="l00131"></a>00131 <span class="comment">/* C = A * scale */</span>
159 <a name="l00132"></a>00132 <span class="comment">/* Scale the input and then store the result in the destination buffer. */</span>
160 <a name="l00133"></a>00133 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (__SSAT(((*pSrc++) * scaleFract) >> kShift, 16));
161 <a name="l00134"></a>00134
162 <a name="l00135"></a>00135 <span class="comment">/* Decrement the loop counter */</span>
163 <a name="l00136"></a>00136 blkCnt--;
164 <a name="l00137"></a>00137 }
165 <a name="l00138"></a>00138
166 <a name="l00139"></a>00139 <span class="preprocessor">#else</span>
167 <a name="l00140"></a>00140 <span class="preprocessor"></span>
168 <a name="l00141"></a>00141 <span class="comment">/* Run the below code for Cortex-M0 */</span>
169 <a name="l00142"></a>00142
170 <a name="l00143"></a>00143 <span class="comment">/* Initialize blkCnt with number of samples */</span>
171 <a name="l00144"></a>00144 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
172 <a name="l00145"></a>00145
173 <a name="l00146"></a>00146 <span class="keywordflow">while</span>(blkCnt > 0u)
174 <a name="l00147"></a>00147 {
175 <a name="l00148"></a>00148 <span class="comment">/* C = A * scale */</span>
176 <a name="l00149"></a>00149 <span class="comment">/* Scale the input and then store the result in the destination buffer. */</span>
177 <a name="l00150"></a>00150 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (__SSAT(((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * pSrc++ * scaleFract) >> kShift, 16));
178 <a name="l00151"></a>00151
179 <a name="l00152"></a>00152 <span class="comment">/* Decrement the loop counter */</span>
180 <a name="l00153"></a>00153 blkCnt--;
181 <a name="l00154"></a>00154 }
182 <a name="l00155"></a>00155
183 <a name="l00156"></a>00156 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
184 <a name="l00157"></a>00157
185 <a name="l00158"></a>00158 }
186 <a name="l00159"></a>00159
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