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| <h1>arm_fir_sparse_f32.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__fir__sparse__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_fir_sparse_f32.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Floating-point sparse FIR filter processing function. </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 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00033"></a>00033 |
| <a name="l00113"></a><a class="code" href="group___f_i_r___sparse.html#ga23a9284de5ee39406713b91d18ac8838">00113</a> <span class="keywordtype">void</span> <a class="code" href="group___f_i_r___sparse.html#ga23a9284de5ee39406713b91d18ac8838" title="Processing function for the floating-point sparse FIR filter.">arm_fir_sparse_f32</a>( |
| <a name="l00114"></a>00114 <a class="code" href="structarm__fir__sparse__instance__f32.html" title="Instance structure for the floating-point sparse FIR filter.">arm_fir_sparse_instance_f32</a> * S, |
| <a name="l00115"></a>00115 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc, |
| <a name="l00116"></a>00116 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pDst, |
| <a name="l00117"></a>00117 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pScratchIn, |
| <a name="l00118"></a>00118 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00119"></a>00119 { |
| <a name="l00120"></a>00120 |
| <a name="l00121"></a>00121 <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__fir__sparse__instance__f32.html#a794af0916666d11cc564d6df08553555">pState</a>; <span class="comment">/* State pointer */</span> |
| <a name="l00122"></a>00122 <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__fir__sparse__instance__f32.html#a04af7c738dfb0882ad102fcad501d94a">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span> |
| <a name="l00123"></a>00123 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *px; <span class="comment">/* Scratch buffer pointer */</span> |
| <a name="l00124"></a>00124 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *py = pState; <span class="comment">/* Temporary pointers for state buffer */</span> |
| <a name="l00125"></a>00125 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pb = pScratchIn; <span class="comment">/* Temporary pointers for scratch buffer */</span> |
| <a name="l00126"></a>00126 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *pOut; <span class="comment">/* Destination pointer */</span> |
| <a name="l00127"></a>00127 int32_t *pTapDelay = S-><a class="code" href="structarm__fir__sparse__instance__f32.html#aaa54ae67e5d10c6dd0d697945c638d31">pTapDelay</a>; <span class="comment">/* Pointer to the array containing offset of the non-zero tap values. */</span> |
| <a name="l00128"></a>00128 uint32_t delaySize = S-><a class="code" href="structarm__fir__sparse__instance__f32.html#af8b8c775f4084c36774f06c082b4c078">maxDelay</a> + <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; <span class="comment">/* state length */</span> |
| <a name="l00129"></a>00129 uint16_t numTaps = S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a5e19e7f234ac30a3db843352bf2a8515">numTaps</a>; <span class="comment">/* Number of filter coefficients in the filter */</span> |
| <a name="l00130"></a>00130 int32_t readIndex; <span class="comment">/* Read index of the state buffer */</span> |
| <a name="l00131"></a>00131 uint32_t tapCnt, blkCnt; <span class="comment">/* loop counters */</span> |
| <a name="l00132"></a>00132 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> coeff = *pCoeffs++; <span class="comment">/* Read the first coefficient value */</span> |
| <a name="l00133"></a>00133 |
| <a name="l00134"></a>00134 |
| <a name="l00135"></a>00135 |
| <a name="l00136"></a>00136 <span class="comment">/* BlockSize of Input samples are copied into the state buffer */</span> |
| <a name="l00137"></a>00137 <span class="comment">/* StateIndex points to the starting position to write in the state buffer */</span> |
| <a name="l00138"></a>00138 <a class="code" href="arm__math_8h.html#a6ff56c0896ce00712ba8f2fcf72cacd3" title="floating-point Circular write function.">arm_circularWrite_f32</a>((int32_t *) py, delaySize, &S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a>, 1, |
| <a name="l00139"></a>00139 (int32_t *) pSrc, 1, blockSize); |
| <a name="l00140"></a>00140 |
| <a name="l00141"></a>00141 |
| <a name="l00142"></a>00142 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span> |
| <a name="l00143"></a>00143 readIndex = ((int32_t) S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a> - (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++; |
| <a name="l00144"></a>00144 |
| <a name="l00145"></a>00145 <span class="comment">/* Wraparound of readIndex */</span> |
| <a name="l00146"></a>00146 <span class="keywordflow">if</span>(readIndex < 0) |
| <a name="l00147"></a>00147 { |
| <a name="l00148"></a>00148 readIndex += (int32_t) delaySize; |
| <a name="l00149"></a>00149 } |
| <a name="l00150"></a>00150 |
| <a name="l00151"></a>00151 <span class="comment">/* Working pointer for state buffer is updated */</span> |
| <a name="l00152"></a>00152 py = pState; |
| <a name="l00153"></a>00153 |
| <a name="l00154"></a>00154 <span class="comment">/* blockSize samples are read from the state buffer */</span> |
| <a name="l00155"></a>00155 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1, |
| <a name="l00156"></a>00156 (int32_t *) pb, (int32_t *) pb, blockSize, 1, |
| <a name="l00157"></a>00157 blockSize); |
| <a name="l00158"></a>00158 |
| <a name="l00159"></a>00159 <span class="comment">/* Working pointer for the scratch buffer */</span> |
| <a name="l00160"></a>00160 px = pb; |
| <a name="l00161"></a>00161 |
| <a name="l00162"></a>00162 <span class="comment">/* Working pointer for destination buffer */</span> |
| <a name="l00163"></a>00163 pOut = pDst; |
| <a name="l00164"></a>00164 |
| <a name="l00165"></a>00165 |
| <a name="l00166"></a>00166 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00167"></a>00167 <span class="preprocessor"></span> |
| <a name="l00168"></a>00168 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00169"></a>00169 |
| <a name="l00170"></a>00170 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span> |
| <a name="l00171"></a>00171 <span class="comment"> * Compute 4 Multiplications at a time. */</span> |
| <a name="l00172"></a>00172 blkCnt = blockSize >> 2u; |
| <a name="l00173"></a>00173 |
| <a name="l00174"></a>00174 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00175"></a>00175 { |
| <a name="l00176"></a>00176 <span class="comment">/* Perform Multiplications and store in destination buffer */</span> |
| <a name="l00177"></a>00177 *pOut++ = *px++ * coeff; |
| <a name="l00178"></a>00178 *pOut++ = *px++ * coeff; |
| <a name="l00179"></a>00179 *pOut++ = *px++ * coeff; |
| <a name="l00180"></a>00180 *pOut++ = *px++ * coeff; |
| <a name="l00181"></a>00181 |
| <a name="l00182"></a>00182 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00183"></a>00183 blkCnt--; |
| <a name="l00184"></a>00184 } |
| <a name="l00185"></a>00185 |
| <a name="l00186"></a>00186 <span class="comment">/* If the blockSize is not a multiple of 4, </span> |
| <a name="l00187"></a>00187 <span class="comment"> * compute the remaining samples */</span> |
| <a name="l00188"></a>00188 blkCnt = blockSize % 0x4u; |
| <a name="l00189"></a>00189 |
| <a name="l00190"></a>00190 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00191"></a>00191 { |
| <a name="l00192"></a>00192 <span class="comment">/* Perform Multiplications and store in destination buffer */</span> |
| <a name="l00193"></a>00193 *pOut++ = *px++ * coeff; |
| <a name="l00194"></a>00194 |
| <a name="l00195"></a>00195 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00196"></a>00196 blkCnt--; |
| <a name="l00197"></a>00197 } |
| <a name="l00198"></a>00198 |
| <a name="l00199"></a>00199 <span class="comment">/* Load the coefficient value and </span> |
| <a name="l00200"></a>00200 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span> |
| <a name="l00201"></a>00201 coeff = *pCoeffs++; |
| <a name="l00202"></a>00202 |
| <a name="l00203"></a>00203 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span> |
| <a name="l00204"></a>00204 readIndex = ((int32_t) S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a> - (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++; |
| <a name="l00205"></a>00205 |
| <a name="l00206"></a>00206 <span class="comment">/* Wraparound of readIndex */</span> |
| <a name="l00207"></a>00207 <span class="keywordflow">if</span>(readIndex < 0) |
| <a name="l00208"></a>00208 { |
| <a name="l00209"></a>00209 readIndex += (int32_t) delaySize; |
| <a name="l00210"></a>00210 } |
| <a name="l00211"></a>00211 |
| <a name="l00212"></a>00212 <span class="comment">/* Loop over the number of taps. */</span> |
| <a name="l00213"></a>00213 tapCnt = (uint32_t) numTaps - 1u; |
| <a name="l00214"></a>00214 |
| <a name="l00215"></a>00215 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00216"></a>00216 { |
| <a name="l00217"></a>00217 |
| <a name="l00218"></a>00218 <span class="comment">/* Working pointer for state buffer is updated */</span> |
| <a name="l00219"></a>00219 py = pState; |
| <a name="l00220"></a>00220 |
| <a name="l00221"></a>00221 <span class="comment">/* blockSize samples are read from the state buffer */</span> |
| <a name="l00222"></a>00222 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1, |
| <a name="l00223"></a>00223 (int32_t *) pb, (int32_t *) pb, blockSize, 1, |
| <a name="l00224"></a>00224 blockSize); |
| <a name="l00225"></a>00225 |
| <a name="l00226"></a>00226 <span class="comment">/* Working pointer for the scratch buffer */</span> |
| <a name="l00227"></a>00227 px = pb; |
| <a name="l00228"></a>00228 |
| <a name="l00229"></a>00229 <span class="comment">/* Working pointer for destination buffer */</span> |
| <a name="l00230"></a>00230 pOut = pDst; |
| <a name="l00231"></a>00231 |
| <a name="l00232"></a>00232 <span class="comment">/* Loop over the blockSize. Unroll by a factor of 4. </span> |
| <a name="l00233"></a>00233 <span class="comment"> * Compute 4 MACS at a time. */</span> |
| <a name="l00234"></a>00234 blkCnt = blockSize >> 2u; |
| <a name="l00235"></a>00235 |
| <a name="l00236"></a>00236 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00237"></a>00237 { |
| <a name="l00238"></a>00238 <span class="comment">/* Perform Multiply-Accumulate */</span> |
| <a name="l00239"></a>00239 *pOut++ += *px++ * coeff; |
| <a name="l00240"></a>00240 *pOut++ += *px++ * coeff; |
| <a name="l00241"></a>00241 *pOut++ += *px++ * coeff; |
| <a name="l00242"></a>00242 *pOut++ += *px++ * coeff; |
| <a name="l00243"></a>00243 |
| <a name="l00244"></a>00244 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00245"></a>00245 blkCnt--; |
| <a name="l00246"></a>00246 } |
| <a name="l00247"></a>00247 |
| <a name="l00248"></a>00248 <span class="comment">/* If the blockSize is not a multiple of 4, </span> |
| <a name="l00249"></a>00249 <span class="comment"> * compute the remaining samples */</span> |
| <a name="l00250"></a>00250 blkCnt = blockSize % 0x4u; |
| <a name="l00251"></a>00251 |
| <a name="l00252"></a>00252 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00253"></a>00253 { |
| <a name="l00254"></a>00254 <span class="comment">/* Perform Multiply-Accumulate */</span> |
| <a name="l00255"></a>00255 *pOut++ += *px++ * coeff; |
| <a name="l00256"></a>00256 |
| <a name="l00257"></a>00257 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00258"></a>00258 blkCnt--; |
| <a name="l00259"></a>00259 } |
| <a name="l00260"></a>00260 |
| <a name="l00261"></a>00261 <span class="comment">/* Load the coefficient value and </span> |
| <a name="l00262"></a>00262 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span> |
| <a name="l00263"></a>00263 coeff = *pCoeffs++; |
| <a name="l00264"></a>00264 |
| <a name="l00265"></a>00265 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span> |
| <a name="l00266"></a>00266 readIndex = ((int32_t) S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a> - |
| <a name="l00267"></a>00267 (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++; |
| <a name="l00268"></a>00268 |
| <a name="l00269"></a>00269 <span class="comment">/* Wraparound of readIndex */</span> |
| <a name="l00270"></a>00270 <span class="keywordflow">if</span>(readIndex < 0) |
| <a name="l00271"></a>00271 { |
| <a name="l00272"></a>00272 readIndex += (int32_t) delaySize; |
| <a name="l00273"></a>00273 } |
| <a name="l00274"></a>00274 |
| <a name="l00275"></a>00275 <span class="comment">/* Decrement the tap loop counter */</span> |
| <a name="l00276"></a>00276 tapCnt--; |
| <a name="l00277"></a>00277 } |
| <a name="l00278"></a>00278 |
| <a name="l00279"></a>00279 <span class="preprocessor">#else</span> |
| <a name="l00280"></a>00280 <span class="preprocessor"></span> |
| <a name="l00281"></a>00281 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00282"></a>00282 |
| <a name="l00283"></a>00283 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00284"></a>00284 |
| <a name="l00285"></a>00285 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00286"></a>00286 { |
| <a name="l00287"></a>00287 <span class="comment">/* Perform Multiplications and store in destination buffer */</span> |
| <a name="l00288"></a>00288 *pOut++ = *px++ * coeff; |
| <a name="l00289"></a>00289 |
| <a name="l00290"></a>00290 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00291"></a>00291 blkCnt--; |
| <a name="l00292"></a>00292 } |
| <a name="l00293"></a>00293 |
| <a name="l00294"></a>00294 <span class="comment">/* Load the coefficient value and </span> |
| <a name="l00295"></a>00295 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span> |
| <a name="l00296"></a>00296 coeff = *pCoeffs++; |
| <a name="l00297"></a>00297 |
| <a name="l00298"></a>00298 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span> |
| <a name="l00299"></a>00299 readIndex = ((int32_t) S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a> - (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++; |
| <a name="l00300"></a>00300 |
| <a name="l00301"></a>00301 <span class="comment">/* Wraparound of readIndex */</span> |
| <a name="l00302"></a>00302 <span class="keywordflow">if</span>(readIndex < 0) |
| <a name="l00303"></a>00303 { |
| <a name="l00304"></a>00304 readIndex += (int32_t) delaySize; |
| <a name="l00305"></a>00305 } |
| <a name="l00306"></a>00306 |
| <a name="l00307"></a>00307 <span class="comment">/* Loop over the number of taps. */</span> |
| <a name="l00308"></a>00308 tapCnt = (uint32_t) numTaps - 1u; |
| <a name="l00309"></a>00309 |
| <a name="l00310"></a>00310 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00311"></a>00311 { |
| <a name="l00312"></a>00312 |
| <a name="l00313"></a>00313 <span class="comment">/* Working pointer for state buffer is updated */</span> |
| <a name="l00314"></a>00314 py = pState; |
| <a name="l00315"></a>00315 |
| <a name="l00316"></a>00316 <span class="comment">/* blockSize samples are read from the state buffer */</span> |
| <a name="l00317"></a>00317 <a class="code" href="arm__math_8h.html#ae469fac5e1df35f8bcf1b3d7c3136484" title="floating-point Circular Read function.">arm_circularRead_f32</a>((int32_t *) py, delaySize, &readIndex, 1, |
| <a name="l00318"></a>00318 (int32_t *) pb, (int32_t *) pb, blockSize, 1, |
| <a name="l00319"></a>00319 blockSize); |
| <a name="l00320"></a>00320 |
| <a name="l00321"></a>00321 <span class="comment">/* Working pointer for the scratch buffer */</span> |
| <a name="l00322"></a>00322 px = pb; |
| <a name="l00323"></a>00323 |
| <a name="l00324"></a>00324 <span class="comment">/* Working pointer for destination buffer */</span> |
| <a name="l00325"></a>00325 pOut = pDst; |
| <a name="l00326"></a>00326 |
| <a name="l00327"></a>00327 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00328"></a>00328 |
| <a name="l00329"></a>00329 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00330"></a>00330 { |
| <a name="l00331"></a>00331 <span class="comment">/* Perform Multiply-Accumulate */</span> |
| <a name="l00332"></a>00332 *pOut++ += *px++ * coeff; |
| <a name="l00333"></a>00333 |
| <a name="l00334"></a>00334 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00335"></a>00335 blkCnt--; |
| <a name="l00336"></a>00336 } |
| <a name="l00337"></a>00337 |
| <a name="l00338"></a>00338 <span class="comment">/* Load the coefficient value and </span> |
| <a name="l00339"></a>00339 <span class="comment"> * increment the coefficient buffer for the next set of state values */</span> |
| <a name="l00340"></a>00340 coeff = *pCoeffs++; |
| <a name="l00341"></a>00341 |
| <a name="l00342"></a>00342 <span class="comment">/* Read Index, from where the state buffer should be read, is calculated. */</span> |
| <a name="l00343"></a>00343 readIndex = |
| <a name="l00344"></a>00344 ((int32_t) S-><a class="code" href="structarm__fir__sparse__instance__f32.html#a57585aeca9dc8686e08df2865375a86d">stateIndex</a> - (int32_t) <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) - *pTapDelay++; |
| <a name="l00345"></a>00345 |
| <a name="l00346"></a>00346 <span class="comment">/* Wraparound of readIndex */</span> |
| <a name="l00347"></a>00347 <span class="keywordflow">if</span>(readIndex < 0) |
| <a name="l00348"></a>00348 { |
| <a name="l00349"></a>00349 readIndex += (int32_t) delaySize; |
| <a name="l00350"></a>00350 } |
| <a name="l00351"></a>00351 |
| <a name="l00352"></a>00352 <span class="comment">/* Decrement the tap loop counter */</span> |
| <a name="l00353"></a>00353 tapCnt--; |
| <a name="l00354"></a>00354 } |
| <a name="l00355"></a>00355 |
| <a name="l00356"></a>00356 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00357"></a>00357 |
| <a name="l00358"></a>00358 } |
| <a name="l00359"></a>00359 |
| </pre></div></div> |
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