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49 <div class="headertitle">
50 <h1>arm_rfft_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__rfft__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_rfft_q15.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: RFFT & RIFFT Q15 process function </span>
63 <a name="l00011"></a>00011 <span class="comment">* </span>
64 <a name="l00012"></a>00012 <span class="comment">* </span>
65 <a name="l00013"></a>00013 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span>
66 <a name="l00014"></a>00014 <span class="comment">* </span>
67 <a name="l00015"></a>00015 <span class="comment">* Version 1.0.10 2011/7/15 </span>
68 <a name="l00016"></a>00016 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span>
69 <a name="l00017"></a>00017 <span class="comment">* </span>
70 <a name="l00018"></a>00018 <span class="comment">* Version 1.0.3 2010/11/29 </span>
71 <a name="l00019"></a>00019 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
72 <a name="l00020"></a>00020 <span class="comment">* </span>
73 <a name="l00021"></a>00021 <span class="comment">* Version 1.0.2 2010/11/11 </span>
74 <a name="l00022"></a>00022 <span class="comment">* Documentation updated. </span>
75 <a name="l00023"></a>00023 <span class="comment">* </span>
76 <a name="l00024"></a>00024 <span class="comment">* Version 1.0.1 2010/10/05 </span>
77 <a name="l00025"></a>00025 <span class="comment">* Production release and review comments incorporated. </span>
78 <a name="l00026"></a>00026 <span class="comment">* </span>
79 <a name="l00027"></a>00027 <span class="comment">* Version 1.0.0 2010/09/20 </span>
80 <a name="l00028"></a>00028 <span class="comment">* Production release and review comments incorporated </span>
81 <a name="l00029"></a>00029 <span class="comment">* </span>
82 <a name="l00030"></a>00030 <span class="comment">* Version 0.0.7 2010/06/10 </span>
83 <a name="l00031"></a>00031 <span class="comment">* Misra-C changes done </span>
84 <a name="l00032"></a>00032 <span class="comment">* -------------------------------------------------------------------- */</span>
85 <a name="l00033"></a>00033
86 <a name="l00034"></a>00034
87 <a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
88 <a name="l00036"></a>00036
89 <a name="l00037"></a>00037 <span class="comment">/*-------------------------------------------------------------------- </span>
90 <a name="l00038"></a>00038 <span class="comment">* Internal functions prototypes </span>
91 <a name="l00039"></a>00039 <span class="comment">--------------------------------------------------------------------*/</span>
92 <a name="l00040"></a>00040
93 <a name="l00041"></a>00041 <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q15_8c.html#a7c2a21793586f9a69c42140665550e09" title="Core Real FFT process.">arm_split_rfft_q15</a>(
94 <a name="l00042"></a>00042 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
95 <a name="l00043"></a>00043 uint32_t fftLen,
96 <a name="l00044"></a>00044 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pATable,
97 <a name="l00045"></a>00045 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pBTable,
98 <a name="l00046"></a>00046 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
99 <a name="l00047"></a>00047 uint32_t modifier);
100 <a name="l00048"></a>00048
101 <a name="l00049"></a>00049 <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q15_8c.html#aa72a531dd15a53570dddaf01b62158f4" title="Core Real IFFT process.">arm_split_rifft_q15</a>(
102 <a name="l00050"></a>00050 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
103 <a name="l00051"></a>00051 uint32_t fftLen,
104 <a name="l00052"></a>00052 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pATable,
105 <a name="l00053"></a>00053 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pBTable,
106 <a name="l00054"></a>00054 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
107 <a name="l00055"></a>00055 uint32_t modifier);
108 <a name="l00056"></a>00056
109 <a name="l00080"></a><a class="code" href="group___r_f_f_t___r_i_f_f_t.html#ga00e615f5db21736ad5b27fb6146f3fc5">00080</a> <span class="keywordtype">void</span> <a class="code" href="group___r_f_f_t___r_i_f_f_t.html#ga00e615f5db21736ad5b27fb6146f3fc5" title="Processing function for the Q15 RFFT/RIFFT.">arm_rfft_q15</a>(
110 <a name="l00081"></a>00081 <span class="keyword">const</span> <a class="code" href="structarm__rfft__instance__q15.html" title="Instance structure for the Q15 RFFT/RIFFT function.">arm_rfft_instance_q15</a> * S,
111 <a name="l00082"></a>00082 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
112 <a name="l00083"></a>00083 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst)
113 <a name="l00084"></a>00084 {
114 <a name="l00085"></a>00085 <span class="keyword">const</span> <a class="code" href="structarm__cfft__radix4__instance__q15.html" title="Instance structure for the Q15 CFFT/CIFFT function.">arm_cfft_radix4_instance_q15</a> *S_CFFT = S-><a class="code" href="structarm__rfft__instance__q15.html#acd8f28f777f3417280212ce799ebef46">pCfft</a>;
115 <a name="l00086"></a>00086
116 <a name="l00087"></a>00087 <span class="comment">/* Calculation of RIFFT of input */</span>
117 <a name="l00088"></a>00088 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q15.html#a8051ffe268c147e431e1bea7bb4c4258">ifftFlagR</a> == 1u)
118 <a name="l00089"></a>00089 {
119 <a name="l00090"></a>00090 <span class="comment">/* Real IFFT core process */</span>
120 <a name="l00091"></a>00091 <a class="code" href="arm__rfft__q15_8c.html#aa72a531dd15a53570dddaf01b62158f4" title="Core Real IFFT process.">arm_split_rifft_q15</a>(pSrc, S-><a class="code" href="structarm__rfft__instance__q15.html#afef95bc722f5929d5e63ecba14fa3ca1">fftLenBy2</a>, S-><a class="code" href="structarm__rfft__instance__q15.html#affbf2de522ac029432d98e8373c0ec53">pTwiddleAReal</a>,
121 <a name="l00092"></a>00092 S-><a class="code" href="structarm__rfft__instance__q15.html#a937d815022adc557b435ba8c6cd58b0d">pTwiddleBReal</a>, pDst, S-><a class="code" href="structarm__rfft__instance__q15.html#afd444d05858c5f419980e94e8240d5c3">twidCoefRModifier</a>);
122 <a name="l00093"></a>00093
123 <a name="l00094"></a>00094 <span class="comment">/* Complex readix-4 IFFT process */</span>
124 <a name="l00095"></a>00095 <a class="code" href="arm__cfft__radix4__q15_8c.html#aad04e8439d17dab5617bf1be268bb391" title="Core function for the Q15 CIFFT butterfly process.">arm_radix4_butterfly_inverse_q15</a>(pDst, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a5fc543e7d84ca8cb7cf6648970f21ca6">fftLen</a>,
125 <a name="l00096"></a>00096 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a29dd693537e45421a36891f8439e1fba">pTwiddle</a>,
126 <a name="l00097"></a>00097 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#af32fdc78bcc27ca385f9b76a0a1f71c3">twidCoefModifier</a>);
127 <a name="l00098"></a>00098
128 <a name="l00099"></a>00099 <span class="comment">/* Bit reversal process */</span>
129 <a name="l00100"></a>00100 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q15.html#a4c65cd40e0098ec2f5c0dc31488b9bc6">bitReverseFlagR</a> == 1u)
130 <a name="l00101"></a>00101 {
131 <a name="l00102"></a>00102 <a class="code" href="arm__cfft__radix4__q15_8c.html#a12a07b49948c354172ae07358309a4a5" title="In-place bit reversal function.">arm_bitreversal_q15</a>(pDst, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a5fc543e7d84ca8cb7cf6648970f21ca6">fftLen</a>,
132 <a name="l00103"></a>00103 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a6b010e5f02d1130c621e3d2e26b95df1">bitRevFactor</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a4acf704ae0cf30b53bf0fbfae8e34a59">pBitRevTable</a>);
133 <a name="l00104"></a>00104 }
134 <a name="l00105"></a>00105 }
135 <a name="l00106"></a>00106 <span class="keywordflow">else</span>
136 <a name="l00107"></a>00107 {
137 <a name="l00108"></a>00108 <span class="comment">/* Calculation of RFFT of input */</span>
138 <a name="l00109"></a>00109
139 <a name="l00110"></a>00110 <span class="comment">/* Complex readix-4 FFT process */</span>
140 <a name="l00111"></a>00111 <a class="code" href="arm__cfft__radix4__q15_8c.html#a2d01d2045f280c32036da97d33c52440" title="Core function for the Q15 CFFT butterfly process.">arm_radix4_butterfly_q15</a>(pSrc, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a5fc543e7d84ca8cb7cf6648970f21ca6">fftLen</a>,
141 <a name="l00112"></a>00112 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a29dd693537e45421a36891f8439e1fba">pTwiddle</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#af32fdc78bcc27ca385f9b76a0a1f71c3">twidCoefModifier</a>);
142 <a name="l00113"></a>00113
143 <a name="l00114"></a>00114 <span class="comment">/* Bit reversal process */</span>
144 <a name="l00115"></a>00115 <span class="keywordflow">if</span>(S-><a class="code" href="structarm__rfft__instance__q15.html#a4c65cd40e0098ec2f5c0dc31488b9bc6">bitReverseFlagR</a> == 1u)
145 <a name="l00116"></a>00116 {
146 <a name="l00117"></a>00117 <a class="code" href="arm__cfft__radix4__q15_8c.html#a12a07b49948c354172ae07358309a4a5" title="In-place bit reversal function.">arm_bitreversal_q15</a>(pSrc, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a5fc543e7d84ca8cb7cf6648970f21ca6">fftLen</a>,
147 <a name="l00118"></a>00118 S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a6b010e5f02d1130c621e3d2e26b95df1">bitRevFactor</a>, S_CFFT-><a class="code" href="structarm__cfft__radix4__instance__q15.html#a4acf704ae0cf30b53bf0fbfae8e34a59">pBitRevTable</a>);
148 <a name="l00119"></a>00119 }
149 <a name="l00120"></a>00120
150 <a name="l00121"></a>00121 <a class="code" href="arm__rfft__q15_8c.html#a7c2a21793586f9a69c42140665550e09" title="Core Real FFT process.">arm_split_rfft_q15</a>(pSrc, S-><a class="code" href="structarm__rfft__instance__q15.html#afef95bc722f5929d5e63ecba14fa3ca1">fftLenBy2</a>, S-><a class="code" href="structarm__rfft__instance__q15.html#affbf2de522ac029432d98e8373c0ec53">pTwiddleAReal</a>,
151 <a name="l00122"></a>00122 S-><a class="code" href="structarm__rfft__instance__q15.html#a937d815022adc557b435ba8c6cd58b0d">pTwiddleBReal</a>, pDst, S-><a class="code" href="structarm__rfft__instance__q15.html#afd444d05858c5f419980e94e8240d5c3">twidCoefRModifier</a>);
152 <a name="l00123"></a>00123 }
153 <a name="l00124"></a>00124
154 <a name="l00125"></a>00125 }
155 <a name="l00126"></a>00126
156 <a name="l00143"></a><a class="code" href="arm__rfft__q15_8c.html#a7c2a21793586f9a69c42140665550e09">00143</a> <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q15_8c.html#a7c2a21793586f9a69c42140665550e09" title="Core Real FFT process.">arm_split_rfft_q15</a>(
157 <a name="l00144"></a>00144 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
158 <a name="l00145"></a>00145 uint32_t fftLen,
159 <a name="l00146"></a>00146 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pATable,
160 <a name="l00147"></a>00147 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pBTable,
161 <a name="l00148"></a>00148 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
162 <a name="l00149"></a>00149 uint32_t modifier)
163 <a name="l00150"></a>00150 {
164 <a name="l00151"></a>00151 uint32_t i; <span class="comment">/* Loop Counter */</span>
165 <a name="l00152"></a>00152 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> outR, outI; <span class="comment">/* Temporary variables for output */</span>
166 <a name="l00153"></a>00153 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pCoefA, *pCoefB; <span class="comment">/* Temporary pointers for twiddle factors */</span>
167 <a name="l00154"></a>00154 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pSrc1, *pSrc2;
168 <a name="l00155"></a>00155
169 <a name="l00156"></a>00156
170 <a name="l00157"></a>00157 pSrc[2u * fftLen] = pSrc[0];
171 <a name="l00158"></a>00158 pSrc[(2u * fftLen) + 1u] = pSrc[1];
172 <a name="l00159"></a>00159
173 <a name="l00160"></a>00160 pCoefA = &pATable[modifier * 2u];
174 <a name="l00161"></a>00161 pCoefB = &pBTable[modifier * 2u];
175 <a name="l00162"></a>00162
176 <a name="l00163"></a>00163 pSrc1 = &pSrc[2];
177 <a name="l00164"></a>00164 pSrc2 = &pSrc[(2u * fftLen) - 2u];
178 <a name="l00165"></a>00165
179 <a name="l00166"></a>00166 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
180 <a name="l00167"></a>00167 <span class="preprocessor"></span>
181 <a name="l00168"></a>00168 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
182 <a name="l00169"></a>00169
183 <a name="l00170"></a>00170 i = 1u;
184 <a name="l00171"></a>00171
185 <a name="l00172"></a>00172 <span class="keywordflow">while</span>(i < fftLen)
186 <a name="l00173"></a>00173 {
187 <a name="l00174"></a>00174 <span class="comment">/* </span>
188 <a name="l00175"></a>00175 <span class="comment"> outR = (pSrc[2 * i] * pATable[2 * i] - pSrc[2 * i + 1] * pATable[2 * i + 1] </span>
189 <a name="l00176"></a>00176 <span class="comment"> + pSrc[2 * n - 2 * i] * pBTable[2 * i] + </span>
190 <a name="l00177"></a>00177 <span class="comment"> pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span>
191 <a name="l00178"></a>00178 <span class="comment"> */</span>
192 <a name="l00179"></a>00179
193 <a name="l00180"></a>00180 <span class="comment">/* outI = (pIn[2 * i + 1] * pATable[2 * i] + pIn[2 * i] * pATable[2 * i + 1] + </span>
194 <a name="l00181"></a>00181 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span>
195 <a name="l00182"></a>00182 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); */</span>
196 <a name="l00183"></a>00183
197 <a name="l00184"></a>00184
198 <a name="l00185"></a>00185 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
199 <a name="l00186"></a>00186 <span class="preprocessor"></span>
200 <a name="l00187"></a>00187 <span class="comment">/* pSrc[2 * i] * pATable[2 * i] - pSrc[2 * i + 1] * pATable[2 * i + 1] */</span>
201 <a name="l00188"></a>00188 outR = __SMUSD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA));
202 <a name="l00189"></a>00189
203 <a name="l00190"></a>00190 <span class="preprocessor">#else</span>
204 <a name="l00191"></a>00191 <span class="preprocessor"></span>
205 <a name="l00192"></a>00192 <span class="comment">/* -(pSrc[2 * i + 1] * pATable[2 * i + 1] - pSrc[2 * i] * pATable[2 * i]) */</span>
206 <a name="l00193"></a>00193 outR = -(__SMUSD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA)));
207 <a name="l00194"></a>00194
208 <a name="l00195"></a>00195 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
209 <a name="l00196"></a>00196
210 <a name="l00197"></a>00197 <span class="comment">/* pSrc[2 * n - 2 * i] * pBTable[2 * i] + </span>
211 <a name="l00198"></a>00198 <span class="comment"> pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1]) */</span>
212 <a name="l00199"></a>00199 outR = __SMLAD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB), outR) >> 15u;
213 <a name="l00200"></a>00200
214 <a name="l00201"></a>00201 <span class="comment">/* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span>
215 <a name="l00202"></a>00202 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */</span>
216 <a name="l00203"></a>00203
217 <a name="l00204"></a>00204 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
218 <a name="l00205"></a>00205 <span class="preprocessor"></span>
219 <a name="l00206"></a>00206 outI = __SMUSDX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2)--, *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB));
220 <a name="l00207"></a>00207
221 <a name="l00208"></a>00208 <span class="preprocessor">#else</span>
222 <a name="l00209"></a>00209 <span class="preprocessor"></span>
223 <a name="l00210"></a>00210 outI = __SMUSDX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2)--);
224 <a name="l00211"></a>00211
225 <a name="l00212"></a>00212 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
226 <a name="l00213"></a>00213
227 <a name="l00214"></a>00214 <span class="comment">/* (pIn[2 * i + 1] * pATable[2 * i] + pIn[2 * i] * pATable[2 * i + 1] */</span>
228 <a name="l00215"></a>00215 outI = __SMLADX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1)++, *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA), outI);
229 <a name="l00216"></a>00216
230 <a name="l00217"></a>00217 <span class="comment">/* write output */</span>
231 <a name="l00218"></a>00218 pDst[2u * i] = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) outR;
232 <a name="l00219"></a>00219 pDst[(2u * i) + 1u] = outI >> 15u;
233 <a name="l00220"></a>00220
234 <a name="l00221"></a>00221 <span class="comment">/* write complex conjugate output */</span>
235 <a name="l00222"></a>00222 pDst[(4u * fftLen) - (2u * i)] = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) outR;
236 <a name="l00223"></a>00223 pDst[((4u * fftLen) - (2u * i)) + 1u] = -(outI >> 15u);
237 <a name="l00224"></a>00224
238 <a name="l00225"></a>00225 <span class="comment">/* update coefficient pointer */</span>
239 <a name="l00226"></a>00226 pCoefB = pCoefB + (2u * modifier);
240 <a name="l00227"></a>00227 pCoefA = pCoefA + (2u * modifier);
241 <a name="l00228"></a>00228
242 <a name="l00229"></a>00229 i++;
243 <a name="l00230"></a>00230
244 <a name="l00231"></a>00231 }
245 <a name="l00232"></a>00232
246 <a name="l00233"></a>00233 pDst[2u * fftLen] = pSrc[0] - pSrc[1];
247 <a name="l00234"></a>00234 pDst[(2u * fftLen) + 1u] = 0;
248 <a name="l00235"></a>00235
249 <a name="l00236"></a>00236 pDst[0] = pSrc[0] + pSrc[1];
250 <a name="l00237"></a>00237 pDst[1] = 0;
251 <a name="l00238"></a>00238
252 <a name="l00239"></a>00239
253 <a name="l00240"></a>00240 <span class="preprocessor">#else</span>
254 <a name="l00241"></a>00241 <span class="preprocessor"></span>
255 <a name="l00242"></a>00242 <span class="comment">/* Run the below code for Cortex-M0 */</span>
256 <a name="l00243"></a>00243
257 <a name="l00244"></a>00244 i = 1u;
258 <a name="l00245"></a>00245
259 <a name="l00246"></a>00246 <span class="keywordflow">while</span>(i < fftLen)
260 <a name="l00247"></a>00247 {
261 <a name="l00248"></a>00248 <span class="comment">/* </span>
262 <a name="l00249"></a>00249 <span class="comment"> outR = (pSrc[2 * i] * pATable[2 * i] - pSrc[2 * i + 1] * pATable[2 * i + 1] </span>
263 <a name="l00250"></a>00250 <span class="comment"> + pSrc[2 * n - 2 * i] * pBTable[2 * i] + </span>
264 <a name="l00251"></a>00251 <span class="comment"> pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span>
265 <a name="l00252"></a>00252 <span class="comment"> */</span>
266 <a name="l00253"></a>00253
267 <a name="l00254"></a>00254 outR = *pSrc1 * *pCoefA;
268 <a name="l00255"></a>00255 outR = outR - (*(pSrc1 + 1) * *(pCoefA + 1));
269 <a name="l00256"></a>00256 outR = outR + (*pSrc2 * *pCoefB);
270 <a name="l00257"></a>00257 outR = (outR + (*(pSrc2 + 1) * *(pCoefB + 1))) >> 15;
271 <a name="l00258"></a>00258
272 <a name="l00259"></a>00259
273 <a name="l00260"></a>00260 <span class="comment">/* outI = (pIn[2 * i + 1] * pATable[2 * i] + pIn[2 * i] * pATable[2 * i + 1] + </span>
274 <a name="l00261"></a>00261 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span>
275 <a name="l00262"></a>00262 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); </span>
276 <a name="l00263"></a>00263 <span class="comment"> */</span>
277 <a name="l00264"></a>00264
278 <a name="l00265"></a>00265 outI = *pSrc2 * *(pCoefB + 1);
279 <a name="l00266"></a>00266 outI = outI - (*(pSrc2 + 1) * *pCoefB);
280 <a name="l00267"></a>00267 outI = outI + (*(pSrc1 + 1) * *pCoefA);
281 <a name="l00268"></a>00268 outI = outI + (*pSrc1 * *(pCoefA + 1));
282 <a name="l00269"></a>00269
283 <a name="l00270"></a>00270 <span class="comment">/* update input pointers */</span>
284 <a name="l00271"></a>00271 pSrc1 += 2u;
285 <a name="l00272"></a>00272 pSrc2 -= 2u;
286 <a name="l00273"></a>00273
287 <a name="l00274"></a>00274 <span class="comment">/* write output */</span>
288 <a name="l00275"></a>00275 pDst[2u * i] = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) outR;
289 <a name="l00276"></a>00276 pDst[(2u * i) + 1u] = outI >> 15u;
290 <a name="l00277"></a>00277
291 <a name="l00278"></a>00278 <span class="comment">/* write complex conjugate output */</span>
292 <a name="l00279"></a>00279 pDst[(4u * fftLen) - (2u * i)] = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) outR;
293 <a name="l00280"></a>00280 pDst[((4u * fftLen) - (2u * i)) + 1u] = -(outI >> 15u);
294 <a name="l00281"></a>00281
295 <a name="l00282"></a>00282 <span class="comment">/* update coefficient pointer */</span>
296 <a name="l00283"></a>00283 pCoefB = pCoefB + (2u * modifier);
297 <a name="l00284"></a>00284 pCoefA = pCoefA + (2u * modifier);
298 <a name="l00285"></a>00285
299 <a name="l00286"></a>00286 i++;
300 <a name="l00287"></a>00287
301 <a name="l00288"></a>00288 }
302 <a name="l00289"></a>00289
303 <a name="l00290"></a>00290 pDst[2u * fftLen] = pSrc[0] - pSrc[1];
304 <a name="l00291"></a>00291 pDst[(2u * fftLen) + 1u] = 0;
305 <a name="l00292"></a>00292
306 <a name="l00293"></a>00293 pDst[0] = pSrc[0] + pSrc[1];
307 <a name="l00294"></a>00294 pDst[1] = 0;
308 <a name="l00295"></a>00295
309 <a name="l00296"></a>00296 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
310 <a name="l00297"></a>00297
311 <a name="l00298"></a>00298 }
312 <a name="l00299"></a>00299
313 <a name="l00300"></a>00300
314 <a name="l00312"></a><a class="code" href="arm__rfft__q15_8c.html#aa72a531dd15a53570dddaf01b62158f4">00312</a> <span class="keywordtype">void</span> <a class="code" href="arm__rfft__q15_8c.html#aa72a531dd15a53570dddaf01b62158f4" title="Core Real IFFT process.">arm_split_rifft_q15</a>(
315 <a name="l00313"></a>00313 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
316 <a name="l00314"></a>00314 uint32_t fftLen,
317 <a name="l00315"></a>00315 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pATable,
318 <a name="l00316"></a>00316 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pBTable,
319 <a name="l00317"></a>00317 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst,
320 <a name="l00318"></a>00318 uint32_t modifier)
321 <a name="l00319"></a>00319 {
322 <a name="l00320"></a>00320 uint32_t i; <span class="comment">/* Loop Counter */</span>
323 <a name="l00321"></a>00321 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> outR, outI; <span class="comment">/* Temporary variables for output */</span>
324 <a name="l00322"></a>00322 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pCoefA, *pCoefB; <span class="comment">/* Temporary pointers for twiddle factors */</span>
325 <a name="l00323"></a>00323 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pSrc1, *pSrc2;
326 <a name="l00324"></a>00324 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pDst1 = &pDst[0];
327 <a name="l00325"></a>00325
328 <a name="l00326"></a>00326 pCoefA = &pATable[0];
329 <a name="l00327"></a>00327 pCoefB = &pBTable[0];
330 <a name="l00328"></a>00328
331 <a name="l00329"></a>00329 pSrc1 = &pSrc[0];
332 <a name="l00330"></a>00330 pSrc2 = &pSrc[2u * fftLen];
333 <a name="l00331"></a>00331
334 <a name="l00332"></a>00332 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
335 <a name="l00333"></a>00333 <span class="preprocessor"></span>
336 <a name="l00334"></a>00334 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
337 <a name="l00335"></a>00335
338 <a name="l00336"></a>00336 i = fftLen;
339 <a name="l00337"></a>00337
340 <a name="l00338"></a>00338 <span class="keywordflow">while</span>(i > 0u)
341 <a name="l00339"></a>00339 {
342 <a name="l00340"></a>00340
343 <a name="l00341"></a>00341 <span class="comment">/* </span>
344 <a name="l00342"></a>00342 <span class="comment"> outR = (pIn[2 * i] * pATable[2 * i] + pIn[2 * i + 1] * pATable[2 * i + 1] + </span>
345 <a name="l00343"></a>00343 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i] - </span>
346 <a name="l00344"></a>00344 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span>
347 <a name="l00345"></a>00345 <span class="comment"></span>
348 <a name="l00346"></a>00346 <span class="comment"> outI = (pIn[2 * i + 1] * pATable[2 * i] - pIn[2 * i] * pATable[2 * i + 1] - </span>
349 <a name="l00347"></a>00347 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span>
350 <a name="l00348"></a>00348 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); </span>
351 <a name="l00349"></a>00349 <span class="comment"></span>
352 <a name="l00350"></a>00350 <span class="comment"> */</span>
353 <a name="l00351"></a>00351
354 <a name="l00352"></a>00352
355 <a name="l00353"></a>00353 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
356 <a name="l00354"></a>00354 <span class="preprocessor"></span>
357 <a name="l00355"></a>00355 <span class="comment">/* pIn[2 * n - 2 * i] * pBTable[2 * i] - </span>
358 <a name="l00356"></a>00356 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1]) */</span>
359 <a name="l00357"></a>00357 outR = __SMUSD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB));
360 <a name="l00358"></a>00358
361 <a name="l00359"></a>00359 <span class="preprocessor">#else</span>
362 <a name="l00360"></a>00360 <span class="preprocessor"></span>
363 <a name="l00361"></a>00361 <span class="comment">/* -(-pIn[2 * n - 2 * i] * pBTable[2 * i] + </span>
364 <a name="l00362"></a>00362 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1])) */</span>
365 <a name="l00363"></a>00363 outR = -(__SMUSD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB)));
366 <a name="l00364"></a>00364
367 <a name="l00365"></a>00365 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
368 <a name="l00366"></a>00366
369 <a name="l00367"></a>00367 <span class="comment">/* pIn[2 * i] * pATable[2 * i] + pIn[2 * i + 1] * pATable[2 * i + 1] + </span>
370 <a name="l00368"></a>00368 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i] */</span>
371 <a name="l00369"></a>00369 outR = __SMLAD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA), outR) >> 15u;
372 <a name="l00370"></a>00370
373 <a name="l00371"></a>00371 <span class="comment">/* </span>
374 <a name="l00372"></a>00372 <span class="comment"> -pIn[2 * n - 2 * i] * pBTable[2 * i + 1] + </span>
375 <a name="l00373"></a>00373 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */</span>
376 <a name="l00374"></a>00374 outI = __SMUADX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc2)--, *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefB));
377 <a name="l00375"></a>00375
378 <a name="l00376"></a>00376 <span class="comment">/* pIn[2 * i + 1] * pATable[2 * i] - pIn[2 * i] * pATable[2 * i + 1] */</span>
379 <a name="l00377"></a>00377
380 <a name="l00378"></a>00378 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
381 <a name="l00379"></a>00379 <span class="preprocessor"></span>
382 <a name="l00380"></a>00380 outI = __SMLSDX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA), *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1)++, -outI);
383 <a name="l00381"></a>00381
384 <a name="l00382"></a>00382 <span class="preprocessor">#else</span>
385 <a name="l00383"></a>00383 <span class="preprocessor"></span>
386 <a name="l00384"></a>00384 outI = __SMLSDX(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pSrc1)++, *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pCoefA), -outI);
387 <a name="l00385"></a>00385
388 <a name="l00386"></a>00386 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
389 <a name="l00387"></a>00387 <span class="comment">/* write output */</span>
390 <a name="l00388"></a>00388
391 <a name="l00389"></a>00389 <span class="preprocessor">#ifndef ARM_MATH_BIG_ENDIAN</span>
392 <a name="l00390"></a>00390 <span class="preprocessor"></span>
393 <a name="l00391"></a>00391 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst1)++ = __PKHBT(outR, (outI >> 15u), 16);
394 <a name="l00392"></a>00392
395 <a name="l00393"></a>00393 <span class="preprocessor">#else</span>
396 <a name="l00394"></a>00394 <span class="preprocessor"></span>
397 <a name="l00395"></a>00395 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst1)++ = __PKHBT((outI >> 15u), outR, 16);
398 <a name="l00396"></a>00396
399 <a name="l00397"></a>00397 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_BIG_ENDIAN */</span>
400 <a name="l00398"></a>00398
401 <a name="l00399"></a>00399 <span class="comment">/* update coefficient pointer */</span>
402 <a name="l00400"></a>00400 pCoefB = pCoefB + (2u * modifier);
403 <a name="l00401"></a>00401 pCoefA = pCoefA + (2u * modifier);
404 <a name="l00402"></a>00402
405 <a name="l00403"></a>00403 i--;
406 <a name="l00404"></a>00404
407 <a name="l00405"></a>00405 }
408 <a name="l00406"></a>00406
409 <a name="l00407"></a>00407
410 <a name="l00408"></a>00408 <span class="preprocessor">#else</span>
411 <a name="l00409"></a>00409 <span class="preprocessor"></span>
412 <a name="l00410"></a>00410 <span class="comment">/* Run the below code for Cortex-M0 */</span>
413 <a name="l00411"></a>00411
414 <a name="l00412"></a>00412 i = fftLen;
415 <a name="l00413"></a>00413
416 <a name="l00414"></a>00414 <span class="keywordflow">while</span>(i > 0u)
417 <a name="l00415"></a>00415 {
418 <a name="l00416"></a>00416
419 <a name="l00417"></a>00417 <span class="comment">/* </span>
420 <a name="l00418"></a>00418 <span class="comment"> outR = (pIn[2 * i] * pATable[2 * i] + pIn[2 * i + 1] * pATable[2 * i + 1] + </span>
421 <a name="l00419"></a>00419 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i] - </span>
422 <a name="l00420"></a>00420 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); </span>
423 <a name="l00421"></a>00421 <span class="comment"> */</span>
424 <a name="l00422"></a>00422
425 <a name="l00423"></a>00423 outR = *pSrc2 * *pCoefB;
426 <a name="l00424"></a>00424 outR = outR - (*(pSrc2 + 1) * *(pCoefB + 1));
427 <a name="l00425"></a>00425 outR = outR + (*pSrc1 * *pCoefA);
428 <a name="l00426"></a>00426 outR = (outR + (*(pSrc1 + 1) * *(pCoefA + 1))) >> 15;
429 <a name="l00427"></a>00427
430 <a name="l00428"></a>00428 <span class="comment">/* </span>
431 <a name="l00429"></a>00429 <span class="comment"> outI = (pIn[2 * i + 1] * pATable[2 * i] - pIn[2 * i] * pATable[2 * i + 1] - </span>
432 <a name="l00430"></a>00430 <span class="comment"> pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - </span>
433 <a name="l00431"></a>00431 <span class="comment"> pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); </span>
434 <a name="l00432"></a>00432 <span class="comment"> */</span>
435 <a name="l00433"></a>00433
436 <a name="l00434"></a>00434 outI = *(pSrc1 + 1) * *pCoefA;
437 <a name="l00435"></a>00435 outI = outI - (*pSrc1 * *(pCoefA + 1));
438 <a name="l00436"></a>00436 outI = outI - (*pSrc2 * *(pCoefB + 1));
439 <a name="l00437"></a>00437 outI = outI - (*(pSrc2 + 1) * *(pCoefB));
440 <a name="l00438"></a>00438
441 <a name="l00439"></a>00439 <span class="comment">/* update input pointers */</span>
442 <a name="l00440"></a>00440 pSrc1 += 2u;
443 <a name="l00441"></a>00441 pSrc2 -= 2u;
444 <a name="l00442"></a>00442
445 <a name="l00443"></a>00443 <span class="comment">/* write output */</span>
446 <a name="l00444"></a>00444 *pDst1++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) outR;
447 <a name="l00445"></a>00445 *pDst1++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (outI >> 15);
448 <a name="l00446"></a>00446
449 <a name="l00447"></a>00447 <span class="comment">/* update coefficient pointer */</span>
450 <a name="l00448"></a>00448 pCoefB = pCoefB + (2u * modifier);
451 <a name="l00449"></a>00449 pCoefA = pCoefA + (2u * modifier);
452 <a name="l00450"></a>00450
453 <a name="l00451"></a>00451 i--;
454 <a name="l00452"></a>00452
455 <a name="l00453"></a>00453 }
456 <a name="l00454"></a>00454
457 <a name="l00455"></a>00455 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
458 <a name="l00456"></a>00456
459 <a name="l00457"></a>00457 }
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