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49 <div class="headertitle">
50 <h1>arm_lms_norm_f32.c</h1> </div>
52 <div class="contents">
53 <a href="arm__lms__norm__f32_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_f32.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: Processing function for the floating-point Normalised LMS. </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="l00160"></a><a class="code" href="group___l_m_s___n_o_r_m.html#ga2418c929087c6eba719758eaae3f3300">00160</a> <span class="keywordtype">void</span> <a class="code" href="group___l_m_s___n_o_r_m.html#ga2418c929087c6eba719758eaae3f3300" title="Processing function for floating-point normalized LMS filter.">arm_lms_norm_f32</a>(
88 <a name="l00161"></a>00161 <a class="code" href="structarm__lms__norm__instance__f32.html" title="Instance structure for the floating-point normalized LMS filter.">arm_lms_norm_instance_f32</a> * S,
89 <a name="l00162"></a>00162 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc,
90 <a name="l00163"></a>00163 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pRef,
91 <a name="l00164"></a>00164 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pOut,
92 <a name="l00165"></a>00165 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pErr,
93 <a name="l00166"></a>00166 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
94 <a name="l00167"></a>00167 {
95 <a name="l00168"></a>00168 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pState = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>; <span class="comment">/* State pointer */</span>
96 <a name="l00169"></a>00169 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pCoeffs = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a1ba688d90aba7de003ed4ad8e2e7ddda">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span>
97 <a name="l00170"></a>00170 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pStateCurnt; <span class="comment">/* Points to the current sample of the state */</span>
98 <a name="l00171"></a>00171 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *px, *pb; <span class="comment">/* Temporary pointers for state and coefficient buffers */</span>
99 <a name="l00172"></a>00172 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> mu = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a84401d3cfc6c40f69c08223cf341b886">mu</a>; <span class="comment">/* Adaptive factor */</span>
100 <a name="l00173"></a>00173 uint32_t numTaps = S-><a class="code" href="structarm__lms__norm__instance__f32.html#ac95f8ca3d816524c2070643852fac5e8">numTaps</a>; <span class="comment">/* Number of filter coefficients in the filter */</span>
101 <a name="l00174"></a>00174 uint32_t tapCnt, blkCnt; <span class="comment">/* Loop counters */</span>
102 <a name="l00175"></a>00175 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> energy; <span class="comment">/* Energy of the input */</span>
103 <a name="l00176"></a>00176 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> sum, e, d; <span class="comment">/* accumulator, error, reference data sample */</span>
104 <a name="l00177"></a>00177 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> w, x0, in; <span class="comment">/* weight factor, temporary variable to hold input sample and state */</span>
105 <a name="l00178"></a>00178
106 <a name="l00179"></a>00179 <span class="comment">/* Initializations of error, difference, Coefficient update */</span>
107 <a name="l00180"></a>00180 e = 0.0f;
108 <a name="l00181"></a>00181 d = 0.0f;
109 <a name="l00182"></a>00182 w = 0.0f;
110 <a name="l00183"></a>00183
111 <a name="l00184"></a>00184 energy = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a>;
112 <a name="l00185"></a>00185 x0 = S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a>;
113 <a name="l00186"></a>00186
114 <a name="l00187"></a>00187 <span class="comment">/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */</span>
115 <a name="l00188"></a>00188 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span>
116 <a name="l00189"></a>00189 pStateCurnt = &(S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>[(numTaps - 1u)]);
117 <a name="l00190"></a>00190
118 <a name="l00191"></a>00191 <span class="comment">/* Loop over blockSize number of values */</span>
119 <a name="l00192"></a>00192 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
120 <a name="l00193"></a>00193
121 <a name="l00194"></a>00194
122 <a name="l00195"></a>00195 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
123 <a name="l00196"></a>00196 <span class="preprocessor"></span>
124 <a name="l00197"></a>00197 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
125 <a name="l00198"></a>00198
126 <a name="l00199"></a>00199 <span class="keywordflow">while</span>(blkCnt > 0u)
127 <a name="l00200"></a>00200 {
128 <a name="l00201"></a>00201 <span class="comment">/* Copy the new input sample into the state buffer */</span>
129 <a name="l00202"></a>00202 *pStateCurnt++ = *pSrc;
130 <a name="l00203"></a>00203
131 <a name="l00204"></a>00204 <span class="comment">/* Initialize pState pointer */</span>
132 <a name="l00205"></a>00205 px = pState;
133 <a name="l00206"></a>00206
134 <a name="l00207"></a>00207 <span class="comment">/* Initialize coeff pointer */</span>
135 <a name="l00208"></a>00208 pb = (pCoeffs);
136 <a name="l00209"></a>00209
137 <a name="l00210"></a>00210 <span class="comment">/* Read the sample from input buffer */</span>
138 <a name="l00211"></a>00211 in = *pSrc++;
139 <a name="l00212"></a>00212
140 <a name="l00213"></a>00213 <span class="comment">/* Update the energy calculation */</span>
141 <a name="l00214"></a>00214 energy -= x0 * x0;
142 <a name="l00215"></a>00215 energy += in * in;
143 <a name="l00216"></a>00216
144 <a name="l00217"></a>00217 <span class="comment">/* Set the accumulator to zero */</span>
145 <a name="l00218"></a>00218 sum = 0.0f;
146 <a name="l00219"></a>00219
147 <a name="l00220"></a>00220 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span>
148 <a name="l00221"></a>00221 tapCnt = numTaps >> 2;
149 <a name="l00222"></a>00222
150 <a name="l00223"></a>00223 <span class="keywordflow">while</span>(tapCnt > 0u)
151 <a name="l00224"></a>00224 {
152 <a name="l00225"></a>00225 <span class="comment">/* Perform the multiply-accumulate */</span>
153 <a name="l00226"></a>00226 sum += (*px++) * (*pb++);
154 <a name="l00227"></a>00227 sum += (*px++) * (*pb++);
155 <a name="l00228"></a>00228 sum += (*px++) * (*pb++);
156 <a name="l00229"></a>00229 sum += (*px++) * (*pb++);
157 <a name="l00230"></a>00230
158 <a name="l00231"></a>00231 <span class="comment">/* Decrement the loop counter */</span>
159 <a name="l00232"></a>00232 tapCnt--;
160 <a name="l00233"></a>00233 }
161 <a name="l00234"></a>00234
162 <a name="l00235"></a>00235 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span>
163 <a name="l00236"></a>00236 tapCnt = numTaps % 0x4u;
164 <a name="l00237"></a>00237
165 <a name="l00238"></a>00238 <span class="keywordflow">while</span>(tapCnt > 0u)
166 <a name="l00239"></a>00239 {
167 <a name="l00240"></a>00240 <span class="comment">/* Perform the multiply-accumulate */</span>
168 <a name="l00241"></a>00241 sum += (*px++) * (*pb++);
169 <a name="l00242"></a>00242
170 <a name="l00243"></a>00243 <span class="comment">/* Decrement the loop counter */</span>
171 <a name="l00244"></a>00244 tapCnt--;
172 <a name="l00245"></a>00245 }
173 <a name="l00246"></a>00246
174 <a name="l00247"></a>00247 <span class="comment">/* The result in the accumulator, store in the destination buffer. */</span>
175 <a name="l00248"></a>00248 *pOut++ = sum;
176 <a name="l00249"></a>00249
177 <a name="l00250"></a>00250 <span class="comment">/* Compute and store error */</span>
178 <a name="l00251"></a>00251 d = (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>) (*pRef++);
179 <a name="l00252"></a>00252 e = d - sum;
180 <a name="l00253"></a>00253 *pErr++ = e;
181 <a name="l00254"></a>00254
182 <a name="l00255"></a>00255 <span class="comment">/* Calculation of Weighting factor for updating filter coefficients */</span>
183 <a name="l00256"></a>00256 <span class="comment">/* epsilon value 0.000000119209289f */</span>
184 <a name="l00257"></a>00257 w = (e * mu) / (energy + 0.000000119209289f);
185 <a name="l00258"></a>00258
186 <a name="l00259"></a>00259 <span class="comment">/* Initialize pState pointer */</span>
187 <a name="l00260"></a>00260 px = pState;
188 <a name="l00261"></a>00261
189 <a name="l00262"></a>00262 <span class="comment">/* Initialize coeff pointer */</span>
190 <a name="l00263"></a>00263 pb = (pCoeffs);
191 <a name="l00264"></a>00264
192 <a name="l00265"></a>00265 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span>
193 <a name="l00266"></a>00266 tapCnt = numTaps >> 2;
194 <a name="l00267"></a>00267
195 <a name="l00268"></a>00268 <span class="comment">/* Update filter coefficients */</span>
196 <a name="l00269"></a>00269 <span class="keywordflow">while</span>(tapCnt > 0u)
197 <a name="l00270"></a>00270 {
198 <a name="l00271"></a>00271 <span class="comment">/* Perform the multiply-accumulate */</span>
199 <a name="l00272"></a>00272 *pb += w * (*px++);
200 <a name="l00273"></a>00273 pb++;
201 <a name="l00274"></a>00274
202 <a name="l00275"></a>00275 *pb += w * (*px++);
203 <a name="l00276"></a>00276 pb++;
204 <a name="l00277"></a>00277
205 <a name="l00278"></a>00278 *pb += w * (*px++);
206 <a name="l00279"></a>00279 pb++;
207 <a name="l00280"></a>00280
208 <a name="l00281"></a>00281 *pb += w * (*px++);
209 <a name="l00282"></a>00282 pb++;
210 <a name="l00283"></a>00283
211 <a name="l00284"></a>00284
212 <a name="l00285"></a>00285 <span class="comment">/* Decrement the loop counter */</span>
213 <a name="l00286"></a>00286 tapCnt--;
214 <a name="l00287"></a>00287 }
215 <a name="l00288"></a>00288
216 <a name="l00289"></a>00289 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span>
217 <a name="l00290"></a>00290 tapCnt = numTaps % 0x4u;
218 <a name="l00291"></a>00291
219 <a name="l00292"></a>00292 <span class="keywordflow">while</span>(tapCnt > 0u)
220 <a name="l00293"></a>00293 {
221 <a name="l00294"></a>00294 <span class="comment">/* Perform the multiply-accumulate */</span>
222 <a name="l00295"></a>00295 *pb += w * (*px++);
223 <a name="l00296"></a>00296 pb++;
224 <a name="l00297"></a>00297
225 <a name="l00298"></a>00298 <span class="comment">/* Decrement the loop counter */</span>
226 <a name="l00299"></a>00299 tapCnt--;
227 <a name="l00300"></a>00300 }
228 <a name="l00301"></a>00301
229 <a name="l00302"></a>00302 x0 = *pState;
230 <a name="l00303"></a>00303
231 <a name="l00304"></a>00304 <span class="comment">/* Advance state pointer by 1 for the next sample */</span>
232 <a name="l00305"></a>00305 pState = pState + 1;
233 <a name="l00306"></a>00306
234 <a name="l00307"></a>00307 <span class="comment">/* Decrement the loop counter */</span>
235 <a name="l00308"></a>00308 blkCnt--;
236 <a name="l00309"></a>00309 }
237 <a name="l00310"></a>00310
238 <a name="l00311"></a>00311 S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a> = energy;
239 <a name="l00312"></a>00312 S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a> = x0;
240 <a name="l00313"></a>00313
241 <a name="l00314"></a>00314 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span>
242 <a name="l00315"></a>00315 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span>
243 <a name="l00316"></a>00316 <span class="comment"> next function call. */</span>
244 <a name="l00317"></a>00317
245 <a name="l00318"></a>00318 <span class="comment">/* Points to the start of the pState buffer */</span>
246 <a name="l00319"></a>00319 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>;
247 <a name="l00320"></a>00320
248 <a name="l00321"></a>00321 <span class="comment">/* Loop unrolling for (numTaps - 1u)/4 samples copy */</span>
249 <a name="l00322"></a>00322 tapCnt = (numTaps - 1u) >> 2u;
250 <a name="l00323"></a>00323
251 <a name="l00324"></a>00324 <span class="comment">/* copy data */</span>
252 <a name="l00325"></a>00325 <span class="keywordflow">while</span>(tapCnt > 0u)
253 <a name="l00326"></a>00326 {
254 <a name="l00327"></a>00327 *pStateCurnt++ = *pState++;
255 <a name="l00328"></a>00328 *pStateCurnt++ = *pState++;
256 <a name="l00329"></a>00329 *pStateCurnt++ = *pState++;
257 <a name="l00330"></a>00330 *pStateCurnt++ = *pState++;
258 <a name="l00331"></a>00331
259 <a name="l00332"></a>00332 <span class="comment">/* Decrement the loop counter */</span>
260 <a name="l00333"></a>00333 tapCnt--;
261 <a name="l00334"></a>00334 }
262 <a name="l00335"></a>00335
263 <a name="l00336"></a>00336 <span class="comment">/* Calculate remaining number of copies */</span>
264 <a name="l00337"></a>00337 tapCnt = (numTaps - 1u) % 0x4u;
265 <a name="l00338"></a>00338
266 <a name="l00339"></a>00339 <span class="comment">/* Copy the remaining q31_t data */</span>
267 <a name="l00340"></a>00340 <span class="keywordflow">while</span>(tapCnt > 0u)
268 <a name="l00341"></a>00341 {
269 <a name="l00342"></a>00342 *pStateCurnt++ = *pState++;
270 <a name="l00343"></a>00343
271 <a name="l00344"></a>00344 <span class="comment">/* Decrement the loop counter */</span>
272 <a name="l00345"></a>00345 tapCnt--;
273 <a name="l00346"></a>00346 }
274 <a name="l00347"></a>00347
275 <a name="l00348"></a>00348 <span class="preprocessor">#else</span>
276 <a name="l00349"></a>00349 <span class="preprocessor"></span>
277 <a name="l00350"></a>00350 <span class="comment">/* Run the below code for Cortex-M0 */</span>
278 <a name="l00351"></a>00351
279 <a name="l00352"></a>00352 <span class="keywordflow">while</span>(blkCnt > 0u)
280 <a name="l00353"></a>00353 {
281 <a name="l00354"></a>00354 <span class="comment">/* Copy the new input sample into the state buffer */</span>
282 <a name="l00355"></a>00355 *pStateCurnt++ = *pSrc;
283 <a name="l00356"></a>00356
284 <a name="l00357"></a>00357 <span class="comment">/* Initialize pState pointer */</span>
285 <a name="l00358"></a>00358 px = pState;
286 <a name="l00359"></a>00359
287 <a name="l00360"></a>00360 <span class="comment">/* Initialize pCoeffs pointer */</span>
288 <a name="l00361"></a>00361 pb = pCoeffs;
289 <a name="l00362"></a>00362
290 <a name="l00363"></a>00363 <span class="comment">/* Read the sample from input buffer */</span>
291 <a name="l00364"></a>00364 in = *pSrc++;
292 <a name="l00365"></a>00365
293 <a name="l00366"></a>00366 <span class="comment">/* Update the energy calculation */</span>
294 <a name="l00367"></a>00367 energy -= x0 * x0;
295 <a name="l00368"></a>00368 energy += in * in;
296 <a name="l00369"></a>00369
297 <a name="l00370"></a>00370 <span class="comment">/* Set the accumulator to zero */</span>
298 <a name="l00371"></a>00371 sum = 0.0f;
299 <a name="l00372"></a>00372
300 <a name="l00373"></a>00373 <span class="comment">/* Loop over numTaps number of values */</span>
301 <a name="l00374"></a>00374 tapCnt = numTaps;
302 <a name="l00375"></a>00375
303 <a name="l00376"></a>00376 <span class="keywordflow">while</span>(tapCnt > 0u)
304 <a name="l00377"></a>00377 {
305 <a name="l00378"></a>00378 <span class="comment">/* Perform the multiply-accumulate */</span>
306 <a name="l00379"></a>00379 sum += (*px++) * (*pb++);
307 <a name="l00380"></a>00380
308 <a name="l00381"></a>00381 <span class="comment">/* Decrement the loop counter */</span>
309 <a name="l00382"></a>00382 tapCnt--;
310 <a name="l00383"></a>00383 }
311 <a name="l00384"></a>00384
312 <a name="l00385"></a>00385 <span class="comment">/* The result in the accumulator is stored in the destination buffer. */</span>
313 <a name="l00386"></a>00386 *pOut++ = sum;
314 <a name="l00387"></a>00387
315 <a name="l00388"></a>00388 <span class="comment">/* Compute and store error */</span>
316 <a name="l00389"></a>00389 d = (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>) (*pRef++);
317 <a name="l00390"></a>00390 e = d - sum;
318 <a name="l00391"></a>00391 *pErr++ = e;
319 <a name="l00392"></a>00392
320 <a name="l00393"></a>00393 <span class="comment">/* Calculation of Weighting factor for updating filter coefficients */</span>
321 <a name="l00394"></a>00394 <span class="comment">/* epsilon value 0.000000119209289f */</span>
322 <a name="l00395"></a>00395 w = (e * mu) / (energy + 0.000000119209289f);
323 <a name="l00396"></a>00396
324 <a name="l00397"></a>00397 <span class="comment">/* Initialize pState pointer */</span>
325 <a name="l00398"></a>00398 px = pState;
326 <a name="l00399"></a>00399
327 <a name="l00400"></a>00400 <span class="comment">/* Initialize pCcoeffs pointer */</span>
328 <a name="l00401"></a>00401 pb = pCoeffs;
329 <a name="l00402"></a>00402
330 <a name="l00403"></a>00403 <span class="comment">/* Loop over numTaps number of values */</span>
331 <a name="l00404"></a>00404 tapCnt = numTaps;
332 <a name="l00405"></a>00405
333 <a name="l00406"></a>00406 <span class="keywordflow">while</span>(tapCnt > 0u)
334 <a name="l00407"></a>00407 {
335 <a name="l00408"></a>00408 <span class="comment">/* Perform the multiply-accumulate */</span>
336 <a name="l00409"></a>00409 *pb += w * (*px++);
337 <a name="l00410"></a>00410 pb++;
338 <a name="l00411"></a>00411
339 <a name="l00412"></a>00412 <span class="comment">/* Decrement the loop counter */</span>
340 <a name="l00413"></a>00413 tapCnt--;
341 <a name="l00414"></a>00414 }
342 <a name="l00415"></a>00415
343 <a name="l00416"></a>00416 x0 = *pState;
344 <a name="l00417"></a>00417
345 <a name="l00418"></a>00418 <span class="comment">/* Advance state pointer by 1 for the next sample */</span>
346 <a name="l00419"></a>00419 pState = pState + 1;
347 <a name="l00420"></a>00420
348 <a name="l00421"></a>00421 <span class="comment">/* Decrement the loop counter */</span>
349 <a name="l00422"></a>00422 blkCnt--;
350 <a name="l00423"></a>00423 }
351 <a name="l00424"></a>00424
352 <a name="l00425"></a>00425 S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a> = energy;
353 <a name="l00426"></a>00426 S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a> = x0;
354 <a name="l00427"></a>00427
355 <a name="l00428"></a>00428 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span>
356 <a name="l00429"></a>00429 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span>
357 <a name="l00430"></a>00430 <span class="comment"> next function call. */</span>
358 <a name="l00431"></a>00431
359 <a name="l00432"></a>00432 <span class="comment">/* Points to the start of the pState buffer */</span>
360 <a name="l00433"></a>00433 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>;
361 <a name="l00434"></a>00434
362 <a name="l00435"></a>00435 <span class="comment">/* Copy (numTaps - 1u) samples */</span>
363 <a name="l00436"></a>00436 tapCnt = (numTaps - 1u);
364 <a name="l00437"></a>00437
365 <a name="l00438"></a>00438 <span class="comment">/* Copy the remaining q31_t data */</span>
366 <a name="l00439"></a>00439 <span class="keywordflow">while</span>(tapCnt > 0u)
367 <a name="l00440"></a>00440 {
368 <a name="l00441"></a>00441 *pStateCurnt++ = *pState++;
369 <a name="l00442"></a>00442
370 <a name="l00443"></a>00443 <span class="comment">/* Decrement the loop counter */</span>
371 <a name="l00444"></a>00444 tapCnt--;
372 <a name="l00445"></a>00445 }
373 <a name="l00446"></a>00446
374 <a name="l00447"></a>00447 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
375 <a name="l00448"></a>00448
376 <a name="l00449"></a>00449 }
377 <a name="l00450"></a>00450
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