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49 <div class="headertitle">
50 <h1>arm_lms_norm_q15.c</h1> </div>
52 <div class="contents">
53 <a href="arm__lms__norm__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_lms_norm_q15.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Q15 NLMS filter. </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="l00071"></a><a class="code" href="group___l_m_s___n_o_r_m.html#gad47486a399dedb0bc85a5990ec5cf981">00071</a> <span class="keywordtype">void</span> <a class="code" href="group___l_m_s___n_o_r_m.html#gad47486a399dedb0bc85a5990ec5cf981" title="Processing function for Q15 normalized LMS filter.">arm_lms_norm_q15</a>(
88 <a name="l00072"></a>00072 <a class="code" href="structarm__lms__norm__instance__q15.html" title="Instance structure for the Q15 normalized LMS filter.">arm_lms_norm_instance_q15</a> * S,
89 <a name="l00073"></a>00073 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrc,
90 <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> * pRef,
91 <a name="l00075"></a>00075 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pOut,
92 <a name="l00076"></a>00076 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pErr,
93 <a name="l00077"></a>00077 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
94 <a name="l00078"></a>00078 {
95 <a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pState = S-><a class="code" href="structarm__lms__norm__instance__q15.html#aa4de490b3bdbd03561b76ee07901c8e3">pState</a>; <span class="comment">/* State pointer */</span>
96 <a name="l00080"></a>00080 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pCoeffs = S-><a class="code" href="structarm__lms__norm__instance__q15.html#ae7bca648c75a2ffa02d87852bb78bc8a">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span>
97 <a name="l00081"></a>00081 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> *pStateCurnt; <span class="comment">/* Points to the current sample of the state */</span>
98 <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> *px, *pb; <span class="comment">/* Temporary pointers for state and coefficient buffers */</span>
99 <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> mu = S-><a class="code" href="structarm__lms__norm__instance__q15.html#a7ce00f21d11cfda6d963240641deea8c">mu</a>; <span class="comment">/* Adaptive factor */</span>
100 <a name="l00084"></a>00084 uint32_t numTaps = S-><a class="code" href="structarm__lms__norm__instance__q15.html#a9ee7a45f4f315d7996a969e25fdc7146">numTaps</a>; <span class="comment">/* Number of filter coefficients in the filter */</span>
101 <a name="l00085"></a>00085 uint32_t tapCnt, blkCnt; <span class="comment">/* Loop counters */</span>
102 <a name="l00086"></a>00086 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> energy; <span class="comment">/* Energy of the input */</span>
103 <a name="l00087"></a>00087 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> acc; <span class="comment">/* Accumulator */</span>
104 <a name="l00088"></a>00088 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> e = 0, d = 0; <span class="comment">/* error, reference data sample */</span>
105 <a name="l00089"></a>00089 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> w = 0, in; <span class="comment">/* weight factor and state */</span>
106 <a name="l00090"></a>00090 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> x0; <span class="comment">/* temporary variable to hold input sample */</span>
107 <a name="l00091"></a>00091 uint32_t shift = (uint32_t) S-><a class="code" href="structarm__lms__norm__instance__q15.html#aa0d435fbcf7dedb7179d4467e9b79e9f">postShift</a> + 1u; <span class="comment">/* Shift to be applied to the output */</span>
108 <a name="l00092"></a>00092 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> errorXmu, oneByEnergy; <span class="comment">/* Temporary variables to store error and mu product and reciprocal of energy */</span>
109 <a name="l00093"></a>00093 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> postShift; <span class="comment">/* Post shift to be applied to weight after reciprocal calculation */</span>
110 <a name="l00094"></a>00094 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> coef; <span class="comment">/* Teporary variable for coefficient */</span>
111 <a name="l00095"></a>00095
112 <a name="l00096"></a>00096 energy = S-><a class="code" href="structarm__lms__norm__instance__q15.html#a1c81ded399919d8181026bc1c8602e7b">energy</a>;
113 <a name="l00097"></a>00097 x0 = S-><a class="code" href="structarm__lms__norm__instance__q15.html#a3fc1d6f97d2c6d5324871de6895cb7e9">x0</a>;
114 <a name="l00098"></a>00098
115 <a name="l00099"></a>00099 <span class="comment">/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */</span>
116 <a name="l00100"></a>00100 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span>
117 <a name="l00101"></a>00101 pStateCurnt = &(S-><a class="code" href="structarm__lms__norm__instance__q15.html#aa4de490b3bdbd03561b76ee07901c8e3">pState</a>[(numTaps - 1u)]);
118 <a name="l00102"></a>00102
119 <a name="l00103"></a>00103 <span class="comment">/* Loop over blockSize number of values */</span>
120 <a name="l00104"></a>00104 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
121 <a name="l00105"></a>00105
122 <a name="l00106"></a>00106
123 <a name="l00107"></a>00107 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
124 <a name="l00108"></a>00108 <span class="preprocessor"></span>
125 <a name="l00109"></a>00109 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
126 <a name="l00110"></a>00110
127 <a name="l00111"></a>00111 <span class="keywordflow">while</span>(blkCnt > 0u)
128 <a name="l00112"></a>00112 {
129 <a name="l00113"></a>00113 <span class="comment">/* Copy the new input sample into the state buffer */</span>
130 <a name="l00114"></a>00114 *pStateCurnt++ = *pSrc;
131 <a name="l00115"></a>00115
132 <a name="l00116"></a>00116 <span class="comment">/* Initialize pState pointer */</span>
133 <a name="l00117"></a>00117 px = pState;
134 <a name="l00118"></a>00118
135 <a name="l00119"></a>00119 <span class="comment">/* Initialize coeff pointer */</span>
136 <a name="l00120"></a>00120 pb = (pCoeffs);
137 <a name="l00121"></a>00121
138 <a name="l00122"></a>00122 <span class="comment">/* Read the sample from input buffer */</span>
139 <a name="l00123"></a>00123 in = *pSrc++;
140 <a name="l00124"></a>00124
141 <a name="l00125"></a>00125 <span class="comment">/* Update the energy calculation */</span>
142 <a name="l00126"></a>00126 energy -= (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) x0 * (x0)) >> 15);
143 <a name="l00127"></a>00127 energy += (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) in * (in)) >> 15);
144 <a name="l00128"></a>00128
145 <a name="l00129"></a>00129 <span class="comment">/* Set the accumulator to zero */</span>
146 <a name="l00130"></a>00130 acc = 0;
147 <a name="l00131"></a>00131
148 <a name="l00132"></a>00132 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span>
149 <a name="l00133"></a>00133 tapCnt = numTaps >> 2;
150 <a name="l00134"></a>00134
151 <a name="l00135"></a>00135 <span class="keywordflow">while</span>(tapCnt > 0u)
152 <a name="l00136"></a>00136 {
153 <a name="l00137"></a>00137
154 <a name="l00138"></a>00138 <span class="comment">/* Perform the multiply-accumulate */</span>
155 <a name="l00139"></a>00139 acc = __SMLALD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(px)++, (*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pb)++), acc);
156 <a name="l00140"></a>00140 acc = __SMLALD(*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(px)++, (*<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pb)++), acc);
157 <a name="l00141"></a>00141
158 <a name="l00142"></a>00142 <span class="comment">/* Decrement the loop counter */</span>
159 <a name="l00143"></a>00143 tapCnt--;
160 <a name="l00144"></a>00144 }
161 <a name="l00145"></a>00145
162 <a name="l00146"></a>00146 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span>
163 <a name="l00147"></a>00147 tapCnt = numTaps % 0x4u;
164 <a name="l00148"></a>00148
165 <a name="l00149"></a>00149 <span class="keywordflow">while</span>(tapCnt > 0u)
166 <a name="l00150"></a>00150 {
167 <a name="l00151"></a>00151 <span class="comment">/* Perform the multiply-accumulate */</span>
168 <a name="l00152"></a>00152 acc += (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * (*pb++)));
169 <a name="l00153"></a>00153
170 <a name="l00154"></a>00154 <span class="comment">/* Decrement the loop counter */</span>
171 <a name="l00155"></a>00155 tapCnt--;
172 <a name="l00156"></a>00156 }
173 <a name="l00157"></a>00157
174 <a name="l00158"></a>00158 <span class="comment">/* Converting the result to 1.15 format */</span>
175 <a name="l00159"></a>00159 acc = __SSAT((acc >> (16u - shift)), 16u);
176 <a name="l00160"></a>00160
177 <a name="l00161"></a>00161 <span class="comment">/* Store the result from accumulator into the destination buffer. */</span>
178 <a name="l00162"></a>00162 *pOut++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) acc;
179 <a name="l00163"></a>00163
180 <a name="l00164"></a>00164 <span class="comment">/* Compute and store error */</span>
181 <a name="l00165"></a>00165 d = *pRef++;
182 <a name="l00166"></a>00166 e = d - (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) acc;
183 <a name="l00167"></a>00167 *pErr++ = e;
184 <a name="l00168"></a>00168
185 <a name="l00169"></a>00169 <span class="comment">/* Calculation of 1/energy */</span>
186 <a name="l00170"></a>00170 postShift = <a class="code" href="arm__math_8h.html#a1c66e370a6ae91aaafbaec5e979198d7" title="Function to Calculates 1/in(reciprocal) value of Q15 Data type.">arm_recip_q15</a>((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) energy + <a class="code" href="arm__math_8h.html#a663277ff19ad0b409fb98b64b2c2750b">DELTA_Q15</a>,
187 <a name="l00171"></a>00171 &oneByEnergy, S-><a class="code" href="structarm__lms__norm__instance__q15.html#a9aabb0e4c79f3db807e7a441fa36f5f8">recipTable</a>);
188 <a name="l00172"></a>00172
189 <a name="l00173"></a>00173 <span class="comment">/* Calculation of e * mu value */</span>
190 <a name="l00174"></a>00174 errorXmu = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) e * mu) >> 15);
191 <a name="l00175"></a>00175
192 <a name="l00176"></a>00176 <span class="comment">/* Calculation of (e * mu) * (1/energy) value */</span>
193 <a name="l00177"></a>00177 acc = (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) errorXmu * oneByEnergy) >> (15 - postShift));
194 <a name="l00178"></a>00178
195 <a name="l00179"></a>00179 <span class="comment">/* Weighting factor for the normalized version */</span>
196 <a name="l00180"></a>00180 w = (<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>) acc, 16);
197 <a name="l00181"></a>00181
198 <a name="l00182"></a>00182 <span class="comment">/* Initialize pState pointer */</span>
199 <a name="l00183"></a>00183 px = pState;
200 <a name="l00184"></a>00184
201 <a name="l00185"></a>00185 <span class="comment">/* Initialize coeff pointer */</span>
202 <a name="l00186"></a>00186 pb = (pCoeffs);
203 <a name="l00187"></a>00187
204 <a name="l00188"></a>00188 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span>
205 <a name="l00189"></a>00189 tapCnt = numTaps >> 2;
206 <a name="l00190"></a>00190
207 <a name="l00191"></a>00191 <span class="comment">/* Update filter coefficients */</span>
208 <a name="l00192"></a>00192 <span class="keywordflow">while</span>(tapCnt > 0u)
209 <a name="l00193"></a>00193 {
210 <a name="l00194"></a>00194 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
211 <a name="l00195"></a>00195 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
212 <a name="l00196"></a>00196 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
213 <a name="l00197"></a>00197 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
214 <a name="l00198"></a>00198 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
215 <a name="l00199"></a>00199 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
216 <a name="l00200"></a>00200 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
217 <a name="l00201"></a>00201 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
218 <a name="l00202"></a>00202
219 <a name="l00203"></a>00203 <span class="comment">/* Decrement the loop counter */</span>
220 <a name="l00204"></a>00204 tapCnt--;
221 <a name="l00205"></a>00205 }
222 <a name="l00206"></a>00206
223 <a name="l00207"></a>00207 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span>
224 <a name="l00208"></a>00208 tapCnt = numTaps % 0x4u;
225 <a name="l00209"></a>00209
226 <a name="l00210"></a>00210 <span class="keywordflow">while</span>(tapCnt > 0u)
227 <a name="l00211"></a>00211 {
228 <a name="l00212"></a>00212 <span class="comment">/* Perform the multiply-accumulate */</span>
229 <a name="l00213"></a>00213 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
230 <a name="l00214"></a>00214 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
231 <a name="l00215"></a>00215
232 <a name="l00216"></a>00216 <span class="comment">/* Decrement the loop counter */</span>
233 <a name="l00217"></a>00217 tapCnt--;
234 <a name="l00218"></a>00218 }
235 <a name="l00219"></a>00219
236 <a name="l00220"></a>00220 <span class="comment">/* Read the sample from state buffer */</span>
237 <a name="l00221"></a>00221 x0 = *pState;
238 <a name="l00222"></a>00222
239 <a name="l00223"></a>00223 <span class="comment">/* Advance state pointer by 1 for the next sample */</span>
240 <a name="l00224"></a>00224 pState = pState + 1u;
241 <a name="l00225"></a>00225
242 <a name="l00226"></a>00226 <span class="comment">/* Decrement the loop counter */</span>
243 <a name="l00227"></a>00227 blkCnt--;
244 <a name="l00228"></a>00228 }
245 <a name="l00229"></a>00229
246 <a name="l00230"></a>00230 <span class="comment">/* Save energy and x0 values for the next frame */</span>
247 <a name="l00231"></a>00231 S-><a class="code" href="structarm__lms__norm__instance__q15.html#a1c81ded399919d8181026bc1c8602e7b">energy</a> = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) energy;
248 <a name="l00232"></a>00232 S-><a class="code" href="structarm__lms__norm__instance__q15.html#a3fc1d6f97d2c6d5324871de6895cb7e9">x0</a> = x0;
249 <a name="l00233"></a>00233
250 <a name="l00234"></a>00234 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span>
251 <a name="l00235"></a>00235 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span>
252 <a name="l00236"></a>00236 <span class="comment"> next function call. */</span>
253 <a name="l00237"></a>00237
254 <a name="l00238"></a>00238 <span class="comment">/* Points to the start of the pState buffer */</span>
255 <a name="l00239"></a>00239 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__q15.html#aa4de490b3bdbd03561b76ee07901c8e3">pState</a>;
256 <a name="l00240"></a>00240
257 <a name="l00241"></a>00241 <span class="comment">/* Calculation of count for copying integer writes */</span>
258 <a name="l00242"></a>00242 tapCnt = (numTaps - 1u) >> 2;
259 <a name="l00243"></a>00243
260 <a name="l00244"></a>00244 <span class="keywordflow">while</span>(tapCnt > 0u)
261 <a name="l00245"></a>00245 {
262 <a name="l00246"></a>00246
263 <a name="l00247"></a>00247 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pStateCurnt)++ = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pState)++;
264 <a name="l00248"></a>00248 *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pStateCurnt)++ = *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pState)++;
265 <a name="l00249"></a>00249
266 <a name="l00250"></a>00250 tapCnt--;
267 <a name="l00251"></a>00251
268 <a name="l00252"></a>00252 }
269 <a name="l00253"></a>00253
270 <a name="l00254"></a>00254 <span class="comment">/* Calculation of count for remaining q15_t data */</span>
271 <a name="l00255"></a>00255 tapCnt = (numTaps - 1u) % 0x4u;
272 <a name="l00256"></a>00256
273 <a name="l00257"></a>00257 <span class="comment">/* copy data */</span>
274 <a name="l00258"></a>00258 <span class="keywordflow">while</span>(tapCnt > 0u)
275 <a name="l00259"></a>00259 {
276 <a name="l00260"></a>00260 *pStateCurnt++ = *pState++;
277 <a name="l00261"></a>00261
278 <a name="l00262"></a>00262 <span class="comment">/* Decrement the loop counter */</span>
279 <a name="l00263"></a>00263 tapCnt--;
280 <a name="l00264"></a>00264 }
281 <a name="l00265"></a>00265
282 <a name="l00266"></a>00266 <span class="preprocessor">#else</span>
283 <a name="l00267"></a>00267 <span class="preprocessor"></span>
284 <a name="l00268"></a>00268 <span class="comment">/* Run the below code for Cortex-M0 */</span>
285 <a name="l00269"></a>00269
286 <a name="l00270"></a>00270 <span class="keywordflow">while</span>(blkCnt > 0u)
287 <a name="l00271"></a>00271 {
288 <a name="l00272"></a>00272 <span class="comment">/* Copy the new input sample into the state buffer */</span>
289 <a name="l00273"></a>00273 *pStateCurnt++ = *pSrc;
290 <a name="l00274"></a>00274
291 <a name="l00275"></a>00275 <span class="comment">/* Initialize pState pointer */</span>
292 <a name="l00276"></a>00276 px = pState;
293 <a name="l00277"></a>00277
294 <a name="l00278"></a>00278 <span class="comment">/* Initialize pCoeffs pointer */</span>
295 <a name="l00279"></a>00279 pb = pCoeffs;
296 <a name="l00280"></a>00280
297 <a name="l00281"></a>00281 <span class="comment">/* Read the sample from input buffer */</span>
298 <a name="l00282"></a>00282 in = *pSrc++;
299 <a name="l00283"></a>00283
300 <a name="l00284"></a>00284 <span class="comment">/* Update the energy calculation */</span>
301 <a name="l00285"></a>00285 energy -= (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) x0 * (x0)) >> 15);
302 <a name="l00286"></a>00286 energy += (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) in * (in)) >> 15);
303 <a name="l00287"></a>00287
304 <a name="l00288"></a>00288 <span class="comment">/* Set the accumulator to zero */</span>
305 <a name="l00289"></a>00289 acc = 0;
306 <a name="l00290"></a>00290
307 <a name="l00291"></a>00291 <span class="comment">/* Loop over numTaps number of values */</span>
308 <a name="l00292"></a>00292 tapCnt = numTaps;
309 <a name="l00293"></a>00293
310 <a name="l00294"></a>00294 <span class="keywordflow">while</span>(tapCnt > 0u)
311 <a name="l00295"></a>00295 {
312 <a name="l00296"></a>00296 <span class="comment">/* Perform the multiply-accumulate */</span>
313 <a name="l00297"></a>00297 acc += (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) * px++ * (*pb++)));
314 <a name="l00298"></a>00298
315 <a name="l00299"></a>00299 <span class="comment">/* Decrement the loop counter */</span>
316 <a name="l00300"></a>00300 tapCnt--;
317 <a name="l00301"></a>00301 }
318 <a name="l00302"></a>00302
319 <a name="l00303"></a>00303 <span class="comment">/* Converting the result to 1.15 format */</span>
320 <a name="l00304"></a>00304 acc = __SSAT((acc >> (16u - shift)), 16u);
321 <a name="l00305"></a>00305
322 <a name="l00306"></a>00306 <span class="comment">/* Store the result from accumulator into the destination buffer. */</span>
323 <a name="l00307"></a>00307 *pOut++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) acc;
324 <a name="l00308"></a>00308
325 <a name="l00309"></a>00309 <span class="comment">/* Compute and store error */</span>
326 <a name="l00310"></a>00310 d = *pRef++;
327 <a name="l00311"></a>00311 e = d - (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) acc;
328 <a name="l00312"></a>00312 *pErr++ = e;
329 <a name="l00313"></a>00313
330 <a name="l00314"></a>00314 <span class="comment">/* Calculation of 1/energy */</span>
331 <a name="l00315"></a>00315 postShift = <a class="code" href="arm__math_8h.html#a1c66e370a6ae91aaafbaec5e979198d7" title="Function to Calculates 1/in(reciprocal) value of Q15 Data type.">arm_recip_q15</a>((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) energy + <a class="code" href="arm__math_8h.html#a663277ff19ad0b409fb98b64b2c2750b">DELTA_Q15</a>,
332 <a name="l00316"></a>00316 &oneByEnergy, S-><a class="code" href="structarm__lms__norm__instance__q15.html#a9aabb0e4c79f3db807e7a441fa36f5f8">recipTable</a>);
333 <a name="l00317"></a>00317
334 <a name="l00318"></a>00318 <span class="comment">/* Calculation of e * mu value */</span>
335 <a name="l00319"></a>00319 errorXmu = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) e * mu) >> 15);
336 <a name="l00320"></a>00320
337 <a name="l00321"></a>00321 <span class="comment">/* Calculation of (e * mu) * (1/energy) value */</span>
338 <a name="l00322"></a>00322 acc = (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) errorXmu * oneByEnergy) >> (15 - postShift));
339 <a name="l00323"></a>00323
340 <a name="l00324"></a>00324 <span class="comment">/* Weighting factor for the normalized version */</span>
341 <a name="l00325"></a>00325 w = (<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>) acc, 16);
342 <a name="l00326"></a>00326
343 <a name="l00327"></a>00327 <span class="comment">/* Initialize pState pointer */</span>
344 <a name="l00328"></a>00328 px = pState;
345 <a name="l00329"></a>00329
346 <a name="l00330"></a>00330 <span class="comment">/* Initialize coeff pointer */</span>
347 <a name="l00331"></a>00331 pb = (pCoeffs);
348 <a name="l00332"></a>00332
349 <a name="l00333"></a>00333 <span class="comment">/* Loop over numTaps number of values */</span>
350 <a name="l00334"></a>00334 tapCnt = numTaps;
351 <a name="l00335"></a>00335
352 <a name="l00336"></a>00336 <span class="keywordflow">while</span>(tapCnt > 0u)
353 <a name="l00337"></a>00337 {
354 <a name="l00338"></a>00338 <span class="comment">/* Perform the multiply-accumulate */</span>
355 <a name="l00339"></a>00339 coef = *pb + (((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) w * (*px++)) >> 15);
356 <a name="l00340"></a>00340 *pb++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((coef), 16);
357 <a name="l00341"></a>00341
358 <a name="l00342"></a>00342 <span class="comment">/* Decrement the loop counter */</span>
359 <a name="l00343"></a>00343 tapCnt--;
360 <a name="l00344"></a>00344 }
361 <a name="l00345"></a>00345
362 <a name="l00346"></a>00346 <span class="comment">/* Read the sample from state buffer */</span>
363 <a name="l00347"></a>00347 x0 = *pState;
364 <a name="l00348"></a>00348
365 <a name="l00349"></a>00349 <span class="comment">/* Advance state pointer by 1 for the next sample */</span>
366 <a name="l00350"></a>00350 pState = pState + 1u;
367 <a name="l00351"></a>00351
368 <a name="l00352"></a>00352 <span class="comment">/* Decrement the loop counter */</span>
369 <a name="l00353"></a>00353 blkCnt--;
370 <a name="l00354"></a>00354 }
371 <a name="l00355"></a>00355
372 <a name="l00356"></a>00356 <span class="comment">/* Save energy and x0 values for the next frame */</span>
373 <a name="l00357"></a>00357 S-><a class="code" href="structarm__lms__norm__instance__q15.html#a1c81ded399919d8181026bc1c8602e7b">energy</a> = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) energy;
374 <a name="l00358"></a>00358 S-><a class="code" href="structarm__lms__norm__instance__q15.html#a3fc1d6f97d2c6d5324871de6895cb7e9">x0</a> = x0;
375 <a name="l00359"></a>00359
376 <a name="l00360"></a>00360 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span>
377 <a name="l00361"></a>00361 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span>
378 <a name="l00362"></a>00362 <span class="comment"> next function call. */</span>
379 <a name="l00363"></a>00363
380 <a name="l00364"></a>00364 <span class="comment">/* Points to the start of the pState buffer */</span>
381 <a name="l00365"></a>00365 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__q15.html#aa4de490b3bdbd03561b76ee07901c8e3">pState</a>;
382 <a name="l00366"></a>00366
383 <a name="l00367"></a>00367 <span class="comment">/* copy (numTaps - 1u) data */</span>
384 <a name="l00368"></a>00368 tapCnt = (numTaps - 1u);
385 <a name="l00369"></a>00369
386 <a name="l00370"></a>00370 <span class="comment">/* copy data */</span>
387 <a name="l00371"></a>00371 <span class="keywordflow">while</span>(tapCnt > 0u)
388 <a name="l00372"></a>00372 {
389 <a name="l00373"></a>00373 *pStateCurnt++ = *pState++;
390 <a name="l00374"></a>00374
391 <a name="l00375"></a>00375 <span class="comment">/* Decrement the loop counter */</span>
392 <a name="l00376"></a>00376 tapCnt--;
393 <a name="l00377"></a>00377 }
394 <a name="l00378"></a>00378
395 <a name="l00379"></a>00379 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
396 <a name="l00380"></a>00380
397 <a name="l00381"></a>00381 }
398 <a name="l00382"></a>00382
399 <a name="l00383"></a>00383
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