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49 <div class="headertitle">
50 <h1>arm_cmplx_conj_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__cmplx__conj__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_cmplx_conj_q15.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q15 complex conjugate. </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="l00054"></a><a class="code" href="group__cmplx__conj.html#gaf47689ae07962acaecb8ddde556df4a4">00054</a> <span class="keywordtype">void</span> <a class="code" href="group__cmplx__conj.html#gaf47689ae07962acaecb8ddde556df4a4" title="Q15 complex conjugate.">arm_cmplx_conj_q15</a>(
85 <a name="l00055"></a>00055 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
86 <a name="l00056"></a>00056 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
87 <a name="l00057"></a>00057 uint32_t numSamples)
88 <a name="l00058"></a>00058 {
89 <a name="l00059"></a>00059
90 <a name="l00060"></a>00060 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
91 <a name="l00061"></a>00061 <span class="preprocessor"></span>
92 <a name="l00062"></a>00062 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
93 <a name="l00063"></a>00063 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
94 <a name="l00064"></a>00064
95 <a name="l00065"></a>00065 <span class="comment">/*loop Unrolling */</span>
96 <a name="l00066"></a>00066 blkCnt = numSamples >> 2u;
97 <a name="l00067"></a>00067
98 <a name="l00068"></a>00068 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
99 <a name="l00069"></a>00069 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
100 <a name="l00070"></a>00070 <span class="keywordflow">while</span>(blkCnt > 0u)
101 <a name="l00071"></a>00071 {
102 <a name="l00072"></a>00072 <span class="comment">/* C[0]+jC[1] = A[0]+ j (-1) A[1] */</span>
103 <a name="l00073"></a>00073 <span class="comment">/* Calculate Complex Conjugate and then store the results in the destination buffer. */</span>
104 <a name="l00074"></a>00074 *pDst++ = *pSrc++;
105 <a name="l00075"></a>00075 *pDst++ = __SSAT(-*pSrc++, 16);
106 <a name="l00076"></a>00076 *pDst++ = *pSrc++;
107 <a name="l00077"></a>00077 *pDst++ = __SSAT(-*pSrc++, 16);
108 <a name="l00078"></a>00078 *pDst++ = *pSrc++;
109 <a name="l00079"></a>00079 *pDst++ = __SSAT(-*pSrc++, 16);
110 <a name="l00080"></a>00080 *pDst++ = *pSrc++;
111 <a name="l00081"></a>00081 *pDst++ = __SSAT(-*pSrc++, 16);
112 <a name="l00082"></a>00082
113 <a name="l00083"></a>00083 <span class="comment">/* Decrement the loop counter */</span>
114 <a name="l00084"></a>00084 blkCnt--;
115 <a name="l00085"></a>00085 }
116 <a name="l00086"></a>00086
117 <a name="l00087"></a>00087 <span class="comment">/* If the numSamples is not a multiple of 4, compute any remaining output samples here. </span>
118 <a name="l00088"></a>00088 <span class="comment"> ** No loop unrolling is used. */</span>
119 <a name="l00089"></a>00089 blkCnt = numSamples % 0x4u;
120 <a name="l00090"></a>00090
121 <a name="l00091"></a>00091 <span class="keywordflow">while</span>(blkCnt > 0u)
122 <a name="l00092"></a>00092 {
123 <a name="l00093"></a>00093 <span class="comment">/* C[0]+jC[1] = A[0]+ j (-1) A[1] */</span>
124 <a name="l00094"></a>00094 <span class="comment">/* Calculate Complex Conjugate and then store the results in the destination buffer. */</span>
125 <a name="l00095"></a>00095 *pDst++ = *pSrc++;
126 <a name="l00096"></a>00096 *pDst++ = __SSAT(-*pSrc++, 16);
127 <a name="l00097"></a>00097
128 <a name="l00098"></a>00098 <span class="comment">/* Decrement the loop counter */</span>
129 <a name="l00099"></a>00099 blkCnt--;
130 <a name="l00100"></a>00100 }
131 <a name="l00101"></a>00101
132 <a name="l00102"></a>00102 <span class="preprocessor">#else</span>
133 <a name="l00103"></a>00103 <span class="preprocessor"></span>
134 <a name="l00104"></a>00104 <span class="comment">/* Run the below code for Cortex-M0 */</span>
135 <a name="l00105"></a>00105
136 <a name="l00106"></a>00106 <span class="keywordflow">while</span>(numSamples > 0u)
137 <a name="l00107"></a>00107 {
138 <a name="l00108"></a>00108 <span class="comment">/* realOut + j (imagOut) = realIn+ j (-1) imagIn */</span>
139 <a name="l00109"></a>00109 <span class="comment">/* Calculate Complex Conjugate and then store the results in the destination buffer. */</span>
140 <a name="l00110"></a>00110 *pDst++ = *pSrc++;
141 <a name="l00111"></a>00111 *pDst++ = -*pSrc++;
142 <a name="l00112"></a>00112
143 <a name="l00113"></a>00113 <span class="comment">/* Decrement the loop counter */</span>
144 <a name="l00114"></a>00114 numSamples--;
145 <a name="l00115"></a>00115 }
146 <a name="l00116"></a>00116
147 <a name="l00117"></a>00117 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
148 <a name="l00118"></a>00118
149 <a name="l00119"></a>00119 }
150 <a name="l00120"></a>00120
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