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| <h1>arm_fir_decimate_f32.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__fir__decimate__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_decimate_f32.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: FIR decimation for floating-point sequences. </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="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00033"></a>00033 |
| <a name="l00034"></a>00034 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00035"></a>00035 |
| <a name="l00132"></a><a class="code" href="group___f_i_r__decimate.html#ga25aa3d58a90bf91b6a82272a0bc518f7">00132</a> <span class="keywordtype">void</span> <a class="code" href="group___f_i_r__decimate.html#ga25aa3d58a90bf91b6a82272a0bc518f7" title="Processing function for the floating-point FIR decimator.">arm_fir_decimate_f32</a>( |
| <a name="l00133"></a>00133 <span class="keyword">const</span> <a class="code" href="structarm__fir__decimate__instance__f32.html" title="Instance structure for the floating-point FIR decimator.">arm_fir_decimate_instance_f32</a> * S, |
| <a name="l00134"></a>00134 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pSrc, |
| <a name="l00135"></a>00135 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> * pDst, |
| <a name="l00136"></a>00136 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00137"></a>00137 { |
| <a name="l00138"></a>00138 <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__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a>; <span class="comment">/* State pointer */</span> |
| <a name="l00139"></a>00139 <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__decimate__instance__f32.html#a268a8b0e80a3d9764baf33e4bc10dde2">pCoeffs</a>; <span class="comment">/* Coefficient pointer */</span> |
| <a name="l00140"></a>00140 <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="l00141"></a>00141 <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="l00142"></a>00142 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> sum0; <span class="comment">/* Accumulator */</span> |
| <a name="l00143"></a>00143 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> x0, c0; <span class="comment">/* Temporary variables to hold state and coefficient values */</span> |
| <a name="l00144"></a>00144 uint32_t numTaps = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a2aa2986129db8affef03ede88dd45a03">numTaps</a>; <span class="comment">/* Number of filter coefficients in the filter */</span> |
| <a name="l00145"></a>00145 uint32_t i, tapCnt, blkCnt, outBlockSize = blockSize / S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>; <span class="comment">/* Loop counters */</span> |
| <a name="l00146"></a>00146 |
| <a name="l00147"></a>00147 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00148"></a>00148 <span class="preprocessor"></span> |
| <a name="l00149"></a>00149 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00150"></a>00150 |
| <a name="l00151"></a>00151 <span class="comment">/* S->pState buffer contains previous frame (numTaps - 1) samples */</span> |
| <a name="l00152"></a>00152 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span> |
| <a name="l00153"></a>00153 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a> + (numTaps - 1u); |
| <a name="l00154"></a>00154 |
| <a name="l00155"></a>00155 <span class="comment">/* Total number of output samples to be computed */</span> |
| <a name="l00156"></a>00156 blkCnt = outBlockSize; |
| <a name="l00157"></a>00157 |
| <a name="l00158"></a>00158 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00159"></a>00159 { |
| <a name="l00160"></a>00160 <span class="comment">/* Copy decimation factor number of new input samples into the state buffer */</span> |
| <a name="l00161"></a>00161 i = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>; |
| <a name="l00162"></a>00162 |
| <a name="l00163"></a>00163 <span class="keywordflow">do</span> |
| <a name="l00164"></a>00164 { |
| <a name="l00165"></a>00165 *pStateCurnt++ = *pSrc++; |
| <a name="l00166"></a>00166 |
| <a name="l00167"></a>00167 } <span class="keywordflow">while</span>(--i); |
| <a name="l00168"></a>00168 |
| <a name="l00169"></a>00169 <span class="comment">/* Set accumulator to zero */</span> |
| <a name="l00170"></a>00170 sum0 = 0.0f; |
| <a name="l00171"></a>00171 |
| <a name="l00172"></a>00172 <span class="comment">/* Initialize state pointer */</span> |
| <a name="l00173"></a>00173 px = pState; |
| <a name="l00174"></a>00174 |
| <a name="l00175"></a>00175 <span class="comment">/* Initialize coeff pointer */</span> |
| <a name="l00176"></a>00176 pb = pCoeffs; |
| <a name="l00177"></a>00177 |
| <a name="l00178"></a>00178 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span> |
| <a name="l00179"></a>00179 tapCnt = numTaps >> 2; |
| <a name="l00180"></a>00180 |
| <a name="l00181"></a>00181 <span class="comment">/* Loop over the number of taps. Unroll by a factor of 4. </span> |
| <a name="l00182"></a>00182 <span class="comment"> ** Repeat until we've computed numTaps-4 coefficients. */</span> |
| <a name="l00183"></a>00183 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00184"></a>00184 { |
| <a name="l00185"></a>00185 <span class="comment">/* Read the b[numTaps-1] coefficient */</span> |
| <a name="l00186"></a>00186 c0 = *(pb++); |
| <a name="l00187"></a>00187 |
| <a name="l00188"></a>00188 <span class="comment">/* Read x[n-numTaps-1] sample */</span> |
| <a name="l00189"></a>00189 x0 = *(px++); |
| <a name="l00190"></a>00190 |
| <a name="l00191"></a>00191 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00192"></a>00192 sum0 += x0 * c0; |
| <a name="l00193"></a>00193 |
| <a name="l00194"></a>00194 <span class="comment">/* Read the b[numTaps-2] coefficient */</span> |
| <a name="l00195"></a>00195 c0 = *(pb++); |
| <a name="l00196"></a>00196 |
| <a name="l00197"></a>00197 <span class="comment">/* Read x[n-numTaps-2] sample */</span> |
| <a name="l00198"></a>00198 x0 = *(px++); |
| <a name="l00199"></a>00199 |
| <a name="l00200"></a>00200 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00201"></a>00201 sum0 += x0 * c0; |
| <a name="l00202"></a>00202 |
| <a name="l00203"></a>00203 <span class="comment">/* Read the b[numTaps-3] coefficient */</span> |
| <a name="l00204"></a>00204 c0 = *(pb++); |
| <a name="l00205"></a>00205 |
| <a name="l00206"></a>00206 <span class="comment">/* Read x[n-numTaps-3] sample */</span> |
| <a name="l00207"></a>00207 x0 = *(px++); |
| <a name="l00208"></a>00208 |
| <a name="l00209"></a>00209 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00210"></a>00210 sum0 += x0 * c0; |
| <a name="l00211"></a>00211 |
| <a name="l00212"></a>00212 <span class="comment">/* Read the b[numTaps-4] coefficient */</span> |
| <a name="l00213"></a>00213 c0 = *(pb++); |
| <a name="l00214"></a>00214 |
| <a name="l00215"></a>00215 <span class="comment">/* Read x[n-numTaps-4] sample */</span> |
| <a name="l00216"></a>00216 x0 = *(px++); |
| <a name="l00217"></a>00217 |
| <a name="l00218"></a>00218 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00219"></a>00219 sum0 += x0 * c0; |
| <a name="l00220"></a>00220 |
| <a name="l00221"></a>00221 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00222"></a>00222 tapCnt--; |
| <a name="l00223"></a>00223 } |
| <a name="l00224"></a>00224 |
| <a name="l00225"></a>00225 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span> |
| <a name="l00226"></a>00226 tapCnt = numTaps % 0x4u; |
| <a name="l00227"></a>00227 |
| <a name="l00228"></a>00228 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00229"></a>00229 { |
| <a name="l00230"></a>00230 <span class="comment">/* Read coefficients */</span> |
| <a name="l00231"></a>00231 c0 = *(pb++); |
| <a name="l00232"></a>00232 |
| <a name="l00233"></a>00233 <span class="comment">/* Fetch 1 state variable */</span> |
| <a name="l00234"></a>00234 x0 = *(px++); |
| <a name="l00235"></a>00235 |
| <a name="l00236"></a>00236 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00237"></a>00237 sum0 += x0 * c0; |
| <a name="l00238"></a>00238 |
| <a name="l00239"></a>00239 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00240"></a>00240 tapCnt--; |
| <a name="l00241"></a>00241 } |
| <a name="l00242"></a>00242 |
| <a name="l00243"></a>00243 <span class="comment">/* Advance the state pointer by the decimation factor </span> |
| <a name="l00244"></a>00244 <span class="comment"> * to process the next group of decimation factor number samples */</span> |
| <a name="l00245"></a>00245 pState = pState + S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>; |
| <a name="l00246"></a>00246 |
| <a name="l00247"></a>00247 <span class="comment">/* The result is in the accumulator, store in the destination buffer. */</span> |
| <a name="l00248"></a>00248 *pDst++ = sum0; |
| <a name="l00249"></a>00249 |
| <a name="l00250"></a>00250 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00251"></a>00251 blkCnt--; |
| <a name="l00252"></a>00252 } |
| <a name="l00253"></a>00253 |
| <a name="l00254"></a>00254 <span class="comment">/* Processing is complete. </span> |
| <a name="l00255"></a>00255 <span class="comment"> ** Now copy the last numTaps - 1 samples to the satrt of the state buffer. </span> |
| <a name="l00256"></a>00256 <span class="comment"> ** This prepares the state buffer for the next function call. */</span> |
| <a name="l00257"></a>00257 |
| <a name="l00258"></a>00258 <span class="comment">/* Points to the start of the state buffer */</span> |
| <a name="l00259"></a>00259 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a>; |
| <a name="l00260"></a>00260 |
| <a name="l00261"></a>00261 i = (numTaps - 1u) >> 2; |
| <a name="l00262"></a>00262 |
| <a name="l00263"></a>00263 <span class="comment">/* copy data */</span> |
| <a name="l00264"></a>00264 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00265"></a>00265 { |
| <a name="l00266"></a>00266 *pStateCurnt++ = *pState++; |
| <a name="l00267"></a>00267 *pStateCurnt++ = *pState++; |
| <a name="l00268"></a>00268 *pStateCurnt++ = *pState++; |
| <a name="l00269"></a>00269 *pStateCurnt++ = *pState++; |
| <a name="l00270"></a>00270 |
| <a name="l00271"></a>00271 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00272"></a>00272 i--; |
| <a name="l00273"></a>00273 } |
| <a name="l00274"></a>00274 |
| <a name="l00275"></a>00275 i = (numTaps - 1u) % 0x04u; |
| <a name="l00276"></a>00276 |
| <a name="l00277"></a>00277 <span class="comment">/* copy data */</span> |
| <a name="l00278"></a>00278 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00279"></a>00279 { |
| <a name="l00280"></a>00280 *pStateCurnt++ = *pState++; |
| <a name="l00281"></a>00281 |
| <a name="l00282"></a>00282 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00283"></a>00283 i--; |
| <a name="l00284"></a>00284 } |
| <a name="l00285"></a>00285 |
| <a name="l00286"></a>00286 <span class="preprocessor">#else</span> |
| <a name="l00287"></a>00287 <span class="preprocessor"></span> |
| <a name="l00288"></a>00288 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00289"></a>00289 |
| <a name="l00290"></a>00290 <span class="comment">/* S->pState buffer contains previous frame (numTaps - 1) samples */</span> |
| <a name="l00291"></a>00291 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span> |
| <a name="l00292"></a>00292 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a> + (numTaps - 1u); |
| <a name="l00293"></a>00293 |
| <a name="l00294"></a>00294 <span class="comment">/* Total number of output samples to be computed */</span> |
| <a name="l00295"></a>00295 blkCnt = outBlockSize; |
| <a name="l00296"></a>00296 |
| <a name="l00297"></a>00297 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00298"></a>00298 { |
| <a name="l00299"></a>00299 <span class="comment">/* Copy decimation factor number of new input samples into the state buffer */</span> |
| <a name="l00300"></a>00300 i = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>; |
| <a name="l00301"></a>00301 |
| <a name="l00302"></a>00302 <span class="keywordflow">do</span> |
| <a name="l00303"></a>00303 { |
| <a name="l00304"></a>00304 *pStateCurnt++ = *pSrc++; |
| <a name="l00305"></a>00305 |
| <a name="l00306"></a>00306 } <span class="keywordflow">while</span>(--i); |
| <a name="l00307"></a>00307 |
| <a name="l00308"></a>00308 <span class="comment">/* Set accumulator to zero */</span> |
| <a name="l00309"></a>00309 sum0 = 0.0f; |
| <a name="l00310"></a>00310 |
| <a name="l00311"></a>00311 <span class="comment">/* Initialize state pointer */</span> |
| <a name="l00312"></a>00312 px = pState; |
| <a name="l00313"></a>00313 |
| <a name="l00314"></a>00314 <span class="comment">/* Initialize coeff pointer */</span> |
| <a name="l00315"></a>00315 pb = pCoeffs; |
| <a name="l00316"></a>00316 |
| <a name="l00317"></a>00317 tapCnt = numTaps; |
| <a name="l00318"></a>00318 |
| <a name="l00319"></a>00319 <span class="keywordflow">while</span>(tapCnt > 0u) |
| <a name="l00320"></a>00320 { |
| <a name="l00321"></a>00321 <span class="comment">/* Read coefficients */</span> |
| <a name="l00322"></a>00322 c0 = *pb++; |
| <a name="l00323"></a>00323 |
| <a name="l00324"></a>00324 <span class="comment">/* Fetch 1 state variable */</span> |
| <a name="l00325"></a>00325 x0 = *px++; |
| <a name="l00326"></a>00326 |
| <a name="l00327"></a>00327 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00328"></a>00328 sum0 += x0 * c0; |
| <a name="l00329"></a>00329 |
| <a name="l00330"></a>00330 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00331"></a>00331 tapCnt--; |
| <a name="l00332"></a>00332 } |
| <a name="l00333"></a>00333 |
| <a name="l00334"></a>00334 <span class="comment">/* Advance the state pointer by the decimation factor </span> |
| <a name="l00335"></a>00335 <span class="comment"> * to process the next group of decimation factor number samples */</span> |
| <a name="l00336"></a>00336 pState = pState + S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>; |
| <a name="l00337"></a>00337 |
| <a name="l00338"></a>00338 <span class="comment">/* The result is in the accumulator, store in the destination buffer. */</span> |
| <a name="l00339"></a>00339 *pDst++ = sum0; |
| <a name="l00340"></a>00340 |
| <a name="l00341"></a>00341 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00342"></a>00342 blkCnt--; |
| <a name="l00343"></a>00343 } |
| <a name="l00344"></a>00344 |
| <a name="l00345"></a>00345 <span class="comment">/* Processing is complete. </span> |
| <a name="l00346"></a>00346 <span class="comment"> ** Now copy the last numTaps - 1 samples to the start of the state buffer. </span> |
| <a name="l00347"></a>00347 <span class="comment"> ** This prepares the state buffer for the next function call. */</span> |
| <a name="l00348"></a>00348 |
| <a name="l00349"></a>00349 <span class="comment">/* Points to the start of the state buffer */</span> |
| <a name="l00350"></a>00350 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a>; |
| <a name="l00351"></a>00351 |
| <a name="l00352"></a>00352 <span class="comment">/* Copy numTaps number of values */</span> |
| <a name="l00353"></a>00353 i = (numTaps - 1u); |
| <a name="l00354"></a>00354 |
| <a name="l00355"></a>00355 <span class="comment">/* copy data */</span> |
| <a name="l00356"></a>00356 <span class="keywordflow">while</span>(i > 0u) |
| <a name="l00357"></a>00357 { |
| <a name="l00358"></a>00358 *pStateCurnt++ = *pState++; |
| <a name="l00359"></a>00359 |
| <a name="l00360"></a>00360 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00361"></a>00361 i--; |
| <a name="l00362"></a>00362 } |
| <a name="l00363"></a>00363 |
| <a name="l00364"></a>00364 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00365"></a>00365 |
| <a name="l00366"></a>00366 } |
| <a name="l00367"></a>00367 |
| </pre></div></div> |
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