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| <h1>arm_lms_norm_f32.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <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> |
| <a name="l00002"></a>00002 <span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span> |
| <a name="l00003"></a>00003 <span class="comment">* </span> |
| <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span> |
| <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span> |
| <a name="l00006"></a>00006 <span class="comment">* </span> |
| <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span> |
| <a name="l00008"></a>00008 <span class="comment">* Title: arm_lms_norm_f32.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Processing function for the floating-point Normalised LMS. </span> |
| <a name="l00011"></a>00011 <span class="comment">* </span> |
| <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</span> |
| <a name="l00013"></a>00013 <span class="comment">* </span> |
| <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span> |
| <a name="l00015"></a>00015 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span> |
| <a name="l00016"></a>00016 <span class="comment">* </span> |
| <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29 </span> |
| <a name="l00018"></a>00018 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span> |
| <a name="l00019"></a>00019 <span class="comment">* </span> |
| <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11 </span> |
| <a name="l00021"></a>00021 <span class="comment">* Documentation updated. </span> |
| <a name="l00022"></a>00022 <span class="comment">* </span> |
| <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05 </span> |
| <a name="l00024"></a>00024 <span class="comment">* Production release and review comments incorporated. </span> |
| <a name="l00025"></a>00025 <span class="comment">* </span> |
| <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20 </span> |
| <a name="l00027"></a>00027 <span class="comment">* Production release and review comments incorporated </span> |
| <a name="l00028"></a>00028 <span class="comment">* </span> |
| <a name="l00029"></a>00029 <span class="comment">* Version 0.0.7 2010/06/10 </span> |
| <a name="l00030"></a>00030 <span class="comment">* Misra-C changes done </span> |
| <a name="l00031"></a>00031 <span class="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00032"></a>00032 |
| <a name="l00033"></a>00033 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00034"></a>00034 |
| <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>( |
| <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, |
| <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, |
| <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, |
| <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, |
| <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, |
| <a name="l00166"></a>00166 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00167"></a>00167 { |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <a name="l00174"></a>00174 uint32_t tapCnt, blkCnt; <span class="comment">/* Loop counters */</span> |
| <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> |
| <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> |
| <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> |
| <a name="l00178"></a>00178 |
| <a name="l00179"></a>00179 <span class="comment">/* Initializations of error, difference, Coefficient update */</span> |
| <a name="l00180"></a>00180 e = 0.0f; |
| <a name="l00181"></a>00181 d = 0.0f; |
| <a name="l00182"></a>00182 w = 0.0f; |
| <a name="l00183"></a>00183 |
| <a name="l00184"></a>00184 energy = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a>; |
| <a name="l00185"></a>00185 x0 = S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a>; |
| <a name="l00186"></a>00186 |
| <a name="l00187"></a>00187 <span class="comment">/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */</span> |
| <a name="l00188"></a>00188 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span> |
| <a name="l00189"></a>00189 pStateCurnt = &(S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>[(numTaps - 1u)]); |
| <a name="l00190"></a>00190 |
| <a name="l00191"></a>00191 <span class="comment">/* Loop over blockSize number of values */</span> |
| <a name="l00192"></a>00192 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00193"></a>00193 |
| <a name="l00194"></a>00194 |
| <a name="l00195"></a>00195 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00196"></a>00196 <span class="preprocessor"></span> |
| <a name="l00197"></a>00197 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00198"></a>00198 |
| <a name="l00199"></a>00199 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00200"></a>00200 { |
| <a name="l00201"></a>00201 <span class="comment">/* Copy the new input sample into the state buffer */</span> |
| <a name="l00202"></a>00202 *pStateCurnt++ = *pSrc; |
| <a name="l00203"></a>00203 |
| <a name="l00204"></a>00204 <span class="comment">/* Initialize pState pointer */</span> |
| <a name="l00205"></a>00205 px = pState; |
| <a name="l00206"></a>00206 |
| <a name="l00207"></a>00207 <span class="comment">/* Initialize coeff pointer */</span> |
| <a name="l00208"></a>00208 pb = (pCoeffs); |
| <a name="l00209"></a>00209 |
| <a name="l00210"></a>00210 <span class="comment">/* Read the sample from input buffer */</span> |
| <a name="l00211"></a>00211 in = *pSrc++; |
| <a name="l00212"></a>00212 |
| <a name="l00213"></a>00213 <span class="comment">/* Update the energy calculation */</span> |
| <a name="l00214"></a>00214 energy -= x0 * x0; |
| <a name="l00215"></a>00215 energy += in * in; |
| <a name="l00216"></a>00216 |
| <a name="l00217"></a>00217 <span class="comment">/* Set the accumulator to zero */</span> |
| <a name="l00218"></a>00218 sum = 0.0f; |
| <a name="l00219"></a>00219 |
| <a name="l00220"></a>00220 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span> |
| <a name="l00221"></a>00221 tapCnt = numTaps >> 2; |
| <a name="l00222"></a>00222 |
| <a name="l00223"></a>00223 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00224"></a>00224 { |
| <a name="l00225"></a>00225 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00226"></a>00226 sum += (*px++) * (*pb++); |
| <a name="l00227"></a>00227 sum += (*px++) * (*pb++); |
| <a name="l00228"></a>00228 sum += (*px++) * (*pb++); |
| <a name="l00229"></a>00229 sum += (*px++) * (*pb++); |
| <a name="l00230"></a>00230 |
| <a name="l00231"></a>00231 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00232"></a>00232 tapCnt--; |
| <a name="l00233"></a>00233 } |
| <a name="l00234"></a>00234 |
| <a name="l00235"></a>00235 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span> |
| <a name="l00236"></a>00236 tapCnt = numTaps % 0x4u; |
| <a name="l00237"></a>00237 |
| <a name="l00238"></a>00238 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00239"></a>00239 { |
| <a name="l00240"></a>00240 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00241"></a>00241 sum += (*px++) * (*pb++); |
| <a name="l00242"></a>00242 |
| <a name="l00243"></a>00243 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00244"></a>00244 tapCnt--; |
| <a name="l00245"></a>00245 } |
| <a name="l00246"></a>00246 |
| <a name="l00247"></a>00247 <span class="comment">/* The result in the accumulator, store in the destination buffer. */</span> |
| <a name="l00248"></a>00248 *pOut++ = sum; |
| <a name="l00249"></a>00249 |
| <a name="l00250"></a>00250 <span class="comment">/* Compute and store error */</span> |
| <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++); |
| <a name="l00252"></a>00252 e = d - sum; |
| <a name="l00253"></a>00253 *pErr++ = e; |
| <a name="l00254"></a>00254 |
| <a name="l00255"></a>00255 <span class="comment">/* Calculation of Weighting factor for updating filter coefficients */</span> |
| <a name="l00256"></a>00256 <span class="comment">/* epsilon value 0.000000119209289f */</span> |
| <a name="l00257"></a>00257 w = (e * mu) / (energy + 0.000000119209289f); |
| <a name="l00258"></a>00258 |
| <a name="l00259"></a>00259 <span class="comment">/* Initialize pState pointer */</span> |
| <a name="l00260"></a>00260 px = pState; |
| <a name="l00261"></a>00261 |
| <a name="l00262"></a>00262 <span class="comment">/* Initialize coeff pointer */</span> |
| <a name="l00263"></a>00263 pb = (pCoeffs); |
| <a name="l00264"></a>00264 |
| <a name="l00265"></a>00265 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span> |
| <a name="l00266"></a>00266 tapCnt = numTaps >> 2; |
| <a name="l00267"></a>00267 |
| <a name="l00268"></a>00268 <span class="comment">/* Update filter coefficients */</span> |
| <a name="l00269"></a>00269 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00270"></a>00270 { |
| <a name="l00271"></a>00271 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00272"></a>00272 *pb += w * (*px++); |
| <a name="l00273"></a>00273 pb++; |
| <a name="l00274"></a>00274 |
| <a name="l00275"></a>00275 *pb += w * (*px++); |
| <a name="l00276"></a>00276 pb++; |
| <a name="l00277"></a>00277 |
| <a name="l00278"></a>00278 *pb += w * (*px++); |
| <a name="l00279"></a>00279 pb++; |
| <a name="l00280"></a>00280 |
| <a name="l00281"></a>00281 *pb += w * (*px++); |
| <a name="l00282"></a>00282 pb++; |
| <a name="l00283"></a>00283 |
| <a name="l00284"></a>00284 |
| <a name="l00285"></a>00285 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00286"></a>00286 tapCnt--; |
| <a name="l00287"></a>00287 } |
| <a name="l00288"></a>00288 |
| <a name="l00289"></a>00289 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span> |
| <a name="l00290"></a>00290 tapCnt = numTaps % 0x4u; |
| <a name="l00291"></a>00291 |
| <a name="l00292"></a>00292 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00293"></a>00293 { |
| <a name="l00294"></a>00294 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00295"></a>00295 *pb += w * (*px++); |
| <a name="l00296"></a>00296 pb++; |
| <a name="l00297"></a>00297 |
| <a name="l00298"></a>00298 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00299"></a>00299 tapCnt--; |
| <a name="l00300"></a>00300 } |
| <a name="l00301"></a>00301 |
| <a name="l00302"></a>00302 x0 = *pState; |
| <a name="l00303"></a>00303 |
| <a name="l00304"></a>00304 <span class="comment">/* Advance state pointer by 1 for the next sample */</span> |
| <a name="l00305"></a>00305 pState = pState + 1; |
| <a name="l00306"></a>00306 |
| <a name="l00307"></a>00307 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00308"></a>00308 blkCnt--; |
| <a name="l00309"></a>00309 } |
| <a name="l00310"></a>00310 |
| <a name="l00311"></a>00311 S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a> = energy; |
| <a name="l00312"></a>00312 S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a> = x0; |
| <a name="l00313"></a>00313 |
| <a name="l00314"></a>00314 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span> |
| <a name="l00315"></a>00315 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span> |
| <a name="l00316"></a>00316 <span class="comment"> next function call. */</span> |
| <a name="l00317"></a>00317 |
| <a name="l00318"></a>00318 <span class="comment">/* Points to the start of the pState buffer */</span> |
| <a name="l00319"></a>00319 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>; |
| <a name="l00320"></a>00320 |
| <a name="l00321"></a>00321 <span class="comment">/* Loop unrolling for (numTaps - 1u)/4 samples copy */</span> |
| <a name="l00322"></a>00322 tapCnt = (numTaps - 1u) >> 2u; |
| <a name="l00323"></a>00323 |
| <a name="l00324"></a>00324 <span class="comment">/* copy data */</span> |
| <a name="l00325"></a>00325 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00326"></a>00326 { |
| <a name="l00327"></a>00327 *pStateCurnt++ = *pState++; |
| <a name="l00328"></a>00328 *pStateCurnt++ = *pState++; |
| <a name="l00329"></a>00329 *pStateCurnt++ = *pState++; |
| <a name="l00330"></a>00330 *pStateCurnt++ = *pState++; |
| <a name="l00331"></a>00331 |
| <a name="l00332"></a>00332 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00333"></a>00333 tapCnt--; |
| <a name="l00334"></a>00334 } |
| <a name="l00335"></a>00335 |
| <a name="l00336"></a>00336 <span class="comment">/* Calculate remaining number of copies */</span> |
| <a name="l00337"></a>00337 tapCnt = (numTaps - 1u) % 0x4u; |
| <a name="l00338"></a>00338 |
| <a name="l00339"></a>00339 <span class="comment">/* Copy the remaining q31_t data */</span> |
| <a name="l00340"></a>00340 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00341"></a>00341 { |
| <a name="l00342"></a>00342 *pStateCurnt++ = *pState++; |
| <a name="l00343"></a>00343 |
| <a name="l00344"></a>00344 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00345"></a>00345 tapCnt--; |
| <a name="l00346"></a>00346 } |
| <a name="l00347"></a>00347 |
| <a name="l00348"></a>00348 <span class="preprocessor">#else</span> |
| <a name="l00349"></a>00349 <span class="preprocessor"></span> |
| <a name="l00350"></a>00350 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00351"></a>00351 |
| <a name="l00352"></a>00352 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00353"></a>00353 { |
| <a name="l00354"></a>00354 <span class="comment">/* Copy the new input sample into the state buffer */</span> |
| <a name="l00355"></a>00355 *pStateCurnt++ = *pSrc; |
| <a name="l00356"></a>00356 |
| <a name="l00357"></a>00357 <span class="comment">/* Initialize pState pointer */</span> |
| <a name="l00358"></a>00358 px = pState; |
| <a name="l00359"></a>00359 |
| <a name="l00360"></a>00360 <span class="comment">/* Initialize pCoeffs pointer */</span> |
| <a name="l00361"></a>00361 pb = pCoeffs; |
| <a name="l00362"></a>00362 |
| <a name="l00363"></a>00363 <span class="comment">/* Read the sample from input buffer */</span> |
| <a name="l00364"></a>00364 in = *pSrc++; |
| <a name="l00365"></a>00365 |
| <a name="l00366"></a>00366 <span class="comment">/* Update the energy calculation */</span> |
| <a name="l00367"></a>00367 energy -= x0 * x0; |
| <a name="l00368"></a>00368 energy += in * in; |
| <a name="l00369"></a>00369 |
| <a name="l00370"></a>00370 <span class="comment">/* Set the accumulator to zero */</span> |
| <a name="l00371"></a>00371 sum = 0.0f; |
| <a name="l00372"></a>00372 |
| <a name="l00373"></a>00373 <span class="comment">/* Loop over numTaps number of values */</span> |
| <a name="l00374"></a>00374 tapCnt = numTaps; |
| <a name="l00375"></a>00375 |
| <a name="l00376"></a>00376 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00377"></a>00377 { |
| <a name="l00378"></a>00378 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00379"></a>00379 sum += (*px++) * (*pb++); |
| <a name="l00380"></a>00380 |
| <a name="l00381"></a>00381 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00382"></a>00382 tapCnt--; |
| <a name="l00383"></a>00383 } |
| <a name="l00384"></a>00384 |
| <a name="l00385"></a>00385 <span class="comment">/* The result in the accumulator is stored in the destination buffer. */</span> |
| <a name="l00386"></a>00386 *pOut++ = sum; |
| <a name="l00387"></a>00387 |
| <a name="l00388"></a>00388 <span class="comment">/* Compute and store error */</span> |
| <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++); |
| <a name="l00390"></a>00390 e = d - sum; |
| <a name="l00391"></a>00391 *pErr++ = e; |
| <a name="l00392"></a>00392 |
| <a name="l00393"></a>00393 <span class="comment">/* Calculation of Weighting factor for updating filter coefficients */</span> |
| <a name="l00394"></a>00394 <span class="comment">/* epsilon value 0.000000119209289f */</span> |
| <a name="l00395"></a>00395 w = (e * mu) / (energy + 0.000000119209289f); |
| <a name="l00396"></a>00396 |
| <a name="l00397"></a>00397 <span class="comment">/* Initialize pState pointer */</span> |
| <a name="l00398"></a>00398 px = pState; |
| <a name="l00399"></a>00399 |
| <a name="l00400"></a>00400 <span class="comment">/* Initialize pCcoeffs pointer */</span> |
| <a name="l00401"></a>00401 pb = pCoeffs; |
| <a name="l00402"></a>00402 |
| <a name="l00403"></a>00403 <span class="comment">/* Loop over numTaps number of values */</span> |
| <a name="l00404"></a>00404 tapCnt = numTaps; |
| <a name="l00405"></a>00405 |
| <a name="l00406"></a>00406 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00407"></a>00407 { |
| <a name="l00408"></a>00408 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00409"></a>00409 *pb += w * (*px++); |
| <a name="l00410"></a>00410 pb++; |
| <a name="l00411"></a>00411 |
| <a name="l00412"></a>00412 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00413"></a>00413 tapCnt--; |
| <a name="l00414"></a>00414 } |
| <a name="l00415"></a>00415 |
| <a name="l00416"></a>00416 x0 = *pState; |
| <a name="l00417"></a>00417 |
| <a name="l00418"></a>00418 <span class="comment">/* Advance state pointer by 1 for the next sample */</span> |
| <a name="l00419"></a>00419 pState = pState + 1; |
| <a name="l00420"></a>00420 |
| <a name="l00421"></a>00421 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00422"></a>00422 blkCnt--; |
| <a name="l00423"></a>00423 } |
| <a name="l00424"></a>00424 |
| <a name="l00425"></a>00425 S-><a class="code" href="structarm__lms__norm__instance__f32.html#a6a4119e4f39447bbee31b066deafa16f">energy</a> = energy; |
| <a name="l00426"></a>00426 S-><a class="code" href="structarm__lms__norm__instance__f32.html#aec958fe89b164a30f38bcca9f5d96218">x0</a> = x0; |
| <a name="l00427"></a>00427 |
| <a name="l00428"></a>00428 <span class="comment">/* Processing is complete. Now copy the last numTaps - 1 samples to the </span> |
| <a name="l00429"></a>00429 <span class="comment"> satrt of the state buffer. This prepares the state buffer for the </span> |
| <a name="l00430"></a>00430 <span class="comment"> next function call. */</span> |
| <a name="l00431"></a>00431 |
| <a name="l00432"></a>00432 <span class="comment">/* Points to the start of the pState buffer */</span> |
| <a name="l00433"></a>00433 pStateCurnt = S-><a class="code" href="structarm__lms__norm__instance__f32.html#a0bc03338687002ed5f2e4a363eb095ec">pState</a>; |
| <a name="l00434"></a>00434 |
| <a name="l00435"></a>00435 <span class="comment">/* Copy (numTaps - 1u) samples */</span> |
| <a name="l00436"></a>00436 tapCnt = (numTaps - 1u); |
| <a name="l00437"></a>00437 |
| <a name="l00438"></a>00438 <span class="comment">/* Copy the remaining q31_t data */</span> |
| <a name="l00439"></a>00439 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00440"></a>00440 { |
| <a name="l00441"></a>00441 *pStateCurnt++ = *pState++; |
| <a name="l00442"></a>00442 |
| <a name="l00443"></a>00443 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00444"></a>00444 tapCnt--; |
| <a name="l00445"></a>00445 } |
| <a name="l00446"></a>00446 |
| <a name="l00447"></a>00447 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00448"></a>00448 |
| <a name="l00449"></a>00449 } |
| <a name="l00450"></a>00450 |
| </pre></div></div> |
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