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49 <div class="headertitle">
50 <h1>arm_mat_scale_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__mat__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_mat_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 matrix 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 0.0.5 2010/04/26 </span>
82 <a name="l00030"></a>00030 <span class="comment">* incorporated review comments and updated with latest CMSIS layer </span>
83 <a name="l00031"></a>00031 <span class="comment">* </span>
84 <a name="l00032"></a>00032 <span class="comment">* Version 0.0.3 2010/03/10 </span>
85 <a name="l00033"></a>00033 <span class="comment">* Initial version </span>
86 <a name="l00034"></a>00034 <span class="comment">* -------------------------------------------------------------------- */</span>
87 <a name="l00035"></a>00035
88 <a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
89 <a name="l00037"></a>00037
90 <a name="l00063"></a><a class="code" href="group___matrix_scale.html#ga7521769e2cf1c3d9c4656138cd2ae2ca">00063</a> <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a class="code" href="group___matrix_scale.html#ga7521769e2cf1c3d9c4656138cd2ae2ca" title="Q15 matrix scaling.">arm_mat_scale_q15</a>(
91 <a name="l00064"></a>00064 <span class="keyword">const</span> <a class="code" href="structarm__matrix__instance__q15.html" title="Instance structure for the Q15 matrix structure.">arm_matrix_instance_q15</a> * pSrc,
92 <a name="l00065"></a>00065 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> scaleFract,
93 <a name="l00066"></a>00066 int32_t shift,
94 <a name="l00067"></a>00067 <a class="code" href="structarm__matrix__instance__q15.html" title="Instance structure for the Q15 matrix structure.">arm_matrix_instance_q15</a> * pDst)
95 <a name="l00068"></a>00068 {
96 <a name="l00069"></a>00069 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pIn = pSrc-><a class="code" href="structarm__matrix__instance__q15.html#a6da33a5553e634787d0f515cf8d724af">pData</a>; <span class="comment">/* input data matrix pointer */</span>
97 <a name="l00070"></a>00070 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pOut = pDst-><a class="code" href="structarm__matrix__instance__q15.html#a6da33a5553e634787d0f515cf8d724af">pData</a>; <span class="comment">/* output data matrix pointer */</span>
98 <a name="l00071"></a>00071 uint32_t numSamples; <span class="comment">/* total number of elements in the matrix */</span>
99 <a name="l00072"></a>00072 int32_t totShift = 15 - shift; <span class="comment">/* total shift to apply after scaling */</span>
100 <a name="l00073"></a>00073 uint32_t blkCnt; <span class="comment">/* loop counters */</span>
101 <a name="l00074"></a>00074 <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>; <span class="comment">/* status of matrix scaling */</span>
102 <a name="l00075"></a>00075
103 <a name="l00076"></a>00076 <span class="preprocessor">#ifdef ARM_MATH_MATRIX_CHECK</span>
104 <a name="l00077"></a>00077 <span class="preprocessor"></span>
105 <a name="l00078"></a>00078
106 <a name="l00079"></a>00079 <span class="comment">/* Check for matrix mismatch */</span>
107 <a name="l00080"></a>00080 <span class="keywordflow">if</span>((pSrc-><a class="code" href="structarm__matrix__instance__q15.html#a9bac6ed54be287c4d4f01a1a28be65f5">numRows</a> != pDst-><a class="code" href="structarm__matrix__instance__q15.html#a9bac6ed54be287c4d4f01a1a28be65f5">numRows</a>) || (pSrc-><a class="code" href="structarm__matrix__instance__q15.html#acbbce67ba058d8e1c867c71d57288c97">numCols</a> != pDst-><a class="code" href="structarm__matrix__instance__q15.html#acbbce67ba058d8e1c867c71d57288c97">numCols</a>))
108 <a name="l00081"></a>00081 {
109 <a name="l00082"></a>00082 <span class="comment">/* Set status as ARM_MATH_SIZE_MISMATCH */</span>
110 <a name="l00083"></a>00083 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a7071b92f1f6bc3c5c312a237ea91105b">ARM_MATH_SIZE_MISMATCH</a>;
111 <a name="l00084"></a>00084 }
112 <a name="l00085"></a>00085 <span class="keywordflow">else</span>
113 <a name="l00086"></a>00086 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef ARM_MATH_MATRIX_CHECK */</span>
114 <a name="l00087"></a>00087
115 <a name="l00088"></a>00088 {
116 <a name="l00089"></a>00089 <span class="comment">/* Total number of samples in the input matrix */</span>
117 <a name="l00090"></a>00090 numSamples = (uint32_t) pSrc-><a class="code" href="structarm__matrix__instance__q15.html#a9bac6ed54be287c4d4f01a1a28be65f5">numRows</a> * pSrc-><a class="code" href="structarm__matrix__instance__q15.html#acbbce67ba058d8e1c867c71d57288c97">numCols</a>;
118 <a name="l00091"></a>00091
119 <a name="l00092"></a>00092 #ifndef ARM_MATH_CM0
120 <a name="l00093"></a>00093
121 <a name="l00094"></a>00094 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
122 <a name="l00095"></a>00095 <span class="comment">/* Loop Unrolling */</span>
123 <a name="l00096"></a>00096 blkCnt = numSamples >> 2;
124 <a name="l00097"></a>00097
125 <a name="l00098"></a>00098 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
126 <a name="l00099"></a>00099 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
127 <a name="l00100"></a>00100 <span class="keywordflow">while</span>(blkCnt > 0u)
128 <a name="l00101"></a>00101 {
129 <a name="l00102"></a>00102 <span class="comment">/* C(m,n) = A(m,n) * k */</span>
130 <a name="l00103"></a>00103 <span class="comment">/* Scale, saturate and then store the results in the destination buffer. */</span>
131 <a name="l00104"></a>00104 *pOut++ =
132 <a name="l00105"></a>00105 (<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>) (*pIn++) * scaleFract) >> totShift, 16));
133 <a name="l00106"></a>00106 *pOut++ =
134 <a name="l00107"></a>00107 (<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>) (*pIn++) * scaleFract) >> totShift, 16));
135 <a name="l00108"></a>00108 *pOut++ =
136 <a name="l00109"></a>00109 (<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>) (*pIn++) * scaleFract) >> totShift, 16));
137 <a name="l00110"></a>00110 *pOut++ =
138 <a name="l00111"></a>00111 (<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>) (*pIn++) * scaleFract) >> totShift, 16));
139 <a name="l00112"></a>00112
140 <a name="l00113"></a>00113 <span class="comment">/* Decrement the numSamples loop counter */</span>
141 <a name="l00114"></a>00114 blkCnt--;
142 <a name="l00115"></a>00115 }
143 <a name="l00116"></a>00116
144 <a name="l00117"></a>00117 <span class="comment">/* If the numSamples is not a multiple of 4, compute any remaining output samples here. </span>
145 <a name="l00118"></a>00118 <span class="comment"> ** No loop unrolling is used. */</span>
146 <a name="l00119"></a>00119 blkCnt = numSamples % 0x4u;
147 <a name="l00120"></a>00120
148 <a name="l00121"></a>00121 <span class="preprocessor">#else</span>
149 <a name="l00122"></a>00122 <span class="preprocessor"></span>
150 <a name="l00123"></a>00123 <span class="comment">/* Run the below code for Cortex-M0 */</span>
151 <a name="l00124"></a>00124
152 <a name="l00125"></a>00125 <span class="comment">/* Initialize blkCnt with number of samples */</span>
153 <a name="l00126"></a>00126 blkCnt = numSamples;
154 <a name="l00127"></a>00127
155 <a name="l00128"></a>00128 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
156 <a name="l00129"></a>00129
157 <a name="l00130"></a>00130 <span class="keywordflow">while</span>(blkCnt > 0u)
158 <a name="l00131"></a>00131 {
159 <a name="l00132"></a>00132 <span class="comment">/* C(m,n) = A(m,n) * k */</span>
160 <a name="l00133"></a>00133 <span class="comment">/* Scale, saturate and then store the results in the destination buffer. */</span>
161 <a name="l00134"></a>00134 *pOut++ =
162 <a name="l00135"></a>00135 (<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>) (*pIn++) * scaleFract) >> totShift, 16));
163 <a name="l00136"></a>00136
164 <a name="l00137"></a>00137 <span class="comment">/* Decrement the numSamples loop counter */</span>
165 <a name="l00138"></a>00138 blkCnt--;
166 <a name="l00139"></a>00139 }
167 <a name="l00140"></a>00140 <span class="comment">/* Set status as ARM_MATH_SUCCESS */</span>
168 <a name="l00141"></a>00141 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;
169 <a name="l00142"></a>00142 }
170 <a name="l00143"></a>00143
171 <a name="l00144"></a>00144 <span class="comment">/* Return to application */</span>
172 <a name="l00145"></a>00145 <span class="keywordflow">return</span> (status);
173 <a name="l00146"></a>00146 }
174 <a name="l00147"></a>00147
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