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49 <div class="headertitle">
50 <h1>arm_fir_decimate_f32.c</h1> </div>
52 <div class="contents">
53 <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>
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_fir_decimate_f32.c </span>
61 <a name="l00009"></a>00009 <span class="comment">* </span>
62 <a name="l00010"></a>00010 <span class="comment">* Description: FIR decimation for floating-point sequences. </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 <span class="comment">* -------------------------------------------------------------------- */</span>
85 <a name="l00033"></a>00033
86 <a name="l00034"></a>00034 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span>
87 <a name="l00035"></a>00035
88 <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>(
89 <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,
90 <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,
91 <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,
92 <a name="l00136"></a>00136 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
93 <a name="l00137"></a>00137 {
94 <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>
95 <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>
96 <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>
97 <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>
98 <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>
99 <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>
100 <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>
101 <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>
102 <a name="l00146"></a>00146
103 <a name="l00147"></a>00147 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
104 <a name="l00148"></a>00148 <span class="preprocessor"></span>
105 <a name="l00149"></a>00149 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
106 <a name="l00150"></a>00150
107 <a name="l00151"></a>00151 <span class="comment">/* S->pState buffer contains previous frame (numTaps - 1) samples */</span>
108 <a name="l00152"></a>00152 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span>
109 <a name="l00153"></a>00153 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a> + (numTaps - 1u);
110 <a name="l00154"></a>00154
111 <a name="l00155"></a>00155 <span class="comment">/* Total number of output samples to be computed */</span>
112 <a name="l00156"></a>00156 blkCnt = outBlockSize;
113 <a name="l00157"></a>00157
114 <a name="l00158"></a>00158 <span class="keywordflow">while</span>(blkCnt > 0u)
115 <a name="l00159"></a>00159 {
116 <a name="l00160"></a>00160 <span class="comment">/* Copy decimation factor number of new input samples into the state buffer */</span>
117 <a name="l00161"></a>00161 i = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>;
118 <a name="l00162"></a>00162
119 <a name="l00163"></a>00163 <span class="keywordflow">do</span>
120 <a name="l00164"></a>00164 {
121 <a name="l00165"></a>00165 *pStateCurnt++ = *pSrc++;
122 <a name="l00166"></a>00166
123 <a name="l00167"></a>00167 } <span class="keywordflow">while</span>(--i);
124 <a name="l00168"></a>00168
125 <a name="l00169"></a>00169 <span class="comment">/* Set accumulator to zero */</span>
126 <a name="l00170"></a>00170 sum0 = 0.0f;
127 <a name="l00171"></a>00171
128 <a name="l00172"></a>00172 <span class="comment">/* Initialize state pointer */</span>
129 <a name="l00173"></a>00173 px = pState;
130 <a name="l00174"></a>00174
131 <a name="l00175"></a>00175 <span class="comment">/* Initialize coeff pointer */</span>
132 <a name="l00176"></a>00176 pb = pCoeffs;
133 <a name="l00177"></a>00177
134 <a name="l00178"></a>00178 <span class="comment">/* Loop unrolling. Process 4 taps at a time. */</span>
135 <a name="l00179"></a>00179 tapCnt = numTaps >> 2;
136 <a name="l00180"></a>00180
137 <a name="l00181"></a>00181 <span class="comment">/* Loop over the number of taps. Unroll by a factor of 4. </span>
138 <a name="l00182"></a>00182 <span class="comment"> ** Repeat until we've computed numTaps-4 coefficients. */</span>
139 <a name="l00183"></a>00183 <span class="keywordflow">while</span>(tapCnt > 0u)
140 <a name="l00184"></a>00184 {
141 <a name="l00185"></a>00185 <span class="comment">/* Read the b[numTaps-1] coefficient */</span>
142 <a name="l00186"></a>00186 c0 = *(pb++);
143 <a name="l00187"></a>00187
144 <a name="l00188"></a>00188 <span class="comment">/* Read x[n-numTaps-1] sample */</span>
145 <a name="l00189"></a>00189 x0 = *(px++);
146 <a name="l00190"></a>00190
147 <a name="l00191"></a>00191 <span class="comment">/* Perform the multiply-accumulate */</span>
148 <a name="l00192"></a>00192 sum0 += x0 * c0;
149 <a name="l00193"></a>00193
150 <a name="l00194"></a>00194 <span class="comment">/* Read the b[numTaps-2] coefficient */</span>
151 <a name="l00195"></a>00195 c0 = *(pb++);
152 <a name="l00196"></a>00196
153 <a name="l00197"></a>00197 <span class="comment">/* Read x[n-numTaps-2] sample */</span>
154 <a name="l00198"></a>00198 x0 = *(px++);
155 <a name="l00199"></a>00199
156 <a name="l00200"></a>00200 <span class="comment">/* Perform the multiply-accumulate */</span>
157 <a name="l00201"></a>00201 sum0 += x0 * c0;
158 <a name="l00202"></a>00202
159 <a name="l00203"></a>00203 <span class="comment">/* Read the b[numTaps-3] coefficient */</span>
160 <a name="l00204"></a>00204 c0 = *(pb++);
161 <a name="l00205"></a>00205
162 <a name="l00206"></a>00206 <span class="comment">/* Read x[n-numTaps-3] sample */</span>
163 <a name="l00207"></a>00207 x0 = *(px++);
164 <a name="l00208"></a>00208
165 <a name="l00209"></a>00209 <span class="comment">/* Perform the multiply-accumulate */</span>
166 <a name="l00210"></a>00210 sum0 += x0 * c0;
167 <a name="l00211"></a>00211
168 <a name="l00212"></a>00212 <span class="comment">/* Read the b[numTaps-4] coefficient */</span>
169 <a name="l00213"></a>00213 c0 = *(pb++);
170 <a name="l00214"></a>00214
171 <a name="l00215"></a>00215 <span class="comment">/* Read x[n-numTaps-4] sample */</span>
172 <a name="l00216"></a>00216 x0 = *(px++);
173 <a name="l00217"></a>00217
174 <a name="l00218"></a>00218 <span class="comment">/* Perform the multiply-accumulate */</span>
175 <a name="l00219"></a>00219 sum0 += x0 * c0;
176 <a name="l00220"></a>00220
177 <a name="l00221"></a>00221 <span class="comment">/* Decrement the loop counter */</span>
178 <a name="l00222"></a>00222 tapCnt--;
179 <a name="l00223"></a>00223 }
180 <a name="l00224"></a>00224
181 <a name="l00225"></a>00225 <span class="comment">/* If the filter length is not a multiple of 4, compute the remaining filter taps */</span>
182 <a name="l00226"></a>00226 tapCnt = numTaps % 0x4u;
183 <a name="l00227"></a>00227
184 <a name="l00228"></a>00228 <span class="keywordflow">while</span>(tapCnt > 0u)
185 <a name="l00229"></a>00229 {
186 <a name="l00230"></a>00230 <span class="comment">/* Read coefficients */</span>
187 <a name="l00231"></a>00231 c0 = *(pb++);
188 <a name="l00232"></a>00232
189 <a name="l00233"></a>00233 <span class="comment">/* Fetch 1 state variable */</span>
190 <a name="l00234"></a>00234 x0 = *(px++);
191 <a name="l00235"></a>00235
192 <a name="l00236"></a>00236 <span class="comment">/* Perform the multiply-accumulate */</span>
193 <a name="l00237"></a>00237 sum0 += x0 * c0;
194 <a name="l00238"></a>00238
195 <a name="l00239"></a>00239 <span class="comment">/* Decrement the loop counter */</span>
196 <a name="l00240"></a>00240 tapCnt--;
197 <a name="l00241"></a>00241 }
198 <a name="l00242"></a>00242
199 <a name="l00243"></a>00243 <span class="comment">/* Advance the state pointer by the decimation factor </span>
200 <a name="l00244"></a>00244 <span class="comment"> * to process the next group of decimation factor number samples */</span>
201 <a name="l00245"></a>00245 pState = pState + S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>;
202 <a name="l00246"></a>00246
203 <a name="l00247"></a>00247 <span class="comment">/* The result is in the accumulator, store in the destination buffer. */</span>
204 <a name="l00248"></a>00248 *pDst++ = sum0;
205 <a name="l00249"></a>00249
206 <a name="l00250"></a>00250 <span class="comment">/* Decrement the loop counter */</span>
207 <a name="l00251"></a>00251 blkCnt--;
208 <a name="l00252"></a>00252 }
209 <a name="l00253"></a>00253
210 <a name="l00254"></a>00254 <span class="comment">/* Processing is complete. </span>
211 <a name="l00255"></a>00255 <span class="comment"> ** Now copy the last numTaps - 1 samples to the satrt of the state buffer. </span>
212 <a name="l00256"></a>00256 <span class="comment"> ** This prepares the state buffer for the next function call. */</span>
213 <a name="l00257"></a>00257
214 <a name="l00258"></a>00258 <span class="comment">/* Points to the start of the state buffer */</span>
215 <a name="l00259"></a>00259 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a>;
216 <a name="l00260"></a>00260
217 <a name="l00261"></a>00261 i = (numTaps - 1u) >> 2;
218 <a name="l00262"></a>00262
219 <a name="l00263"></a>00263 <span class="comment">/* copy data */</span>
220 <a name="l00264"></a>00264 <span class="keywordflow">while</span>(i > 0u)
221 <a name="l00265"></a>00265 {
222 <a name="l00266"></a>00266 *pStateCurnt++ = *pState++;
223 <a name="l00267"></a>00267 *pStateCurnt++ = *pState++;
224 <a name="l00268"></a>00268 *pStateCurnt++ = *pState++;
225 <a name="l00269"></a>00269 *pStateCurnt++ = *pState++;
226 <a name="l00270"></a>00270
227 <a name="l00271"></a>00271 <span class="comment">/* Decrement the loop counter */</span>
228 <a name="l00272"></a>00272 i--;
229 <a name="l00273"></a>00273 }
230 <a name="l00274"></a>00274
231 <a name="l00275"></a>00275 i = (numTaps - 1u) % 0x04u;
232 <a name="l00276"></a>00276
233 <a name="l00277"></a>00277 <span class="comment">/* copy data */</span>
234 <a name="l00278"></a>00278 <span class="keywordflow">while</span>(i > 0u)
235 <a name="l00279"></a>00279 {
236 <a name="l00280"></a>00280 *pStateCurnt++ = *pState++;
237 <a name="l00281"></a>00281
238 <a name="l00282"></a>00282 <span class="comment">/* Decrement the loop counter */</span>
239 <a name="l00283"></a>00283 i--;
240 <a name="l00284"></a>00284 }
241 <a name="l00285"></a>00285
242 <a name="l00286"></a>00286 <span class="preprocessor">#else</span>
243 <a name="l00287"></a>00287 <span class="preprocessor"></span>
244 <a name="l00288"></a>00288 <span class="comment">/* Run the below code for Cortex-M0 */</span>
245 <a name="l00289"></a>00289
246 <a name="l00290"></a>00290 <span class="comment">/* S->pState buffer contains previous frame (numTaps - 1) samples */</span>
247 <a name="l00291"></a>00291 <span class="comment">/* pStateCurnt points to the location where the new input data should be written */</span>
248 <a name="l00292"></a>00292 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a> + (numTaps - 1u);
249 <a name="l00293"></a>00293
250 <a name="l00294"></a>00294 <span class="comment">/* Total number of output samples to be computed */</span>
251 <a name="l00295"></a>00295 blkCnt = outBlockSize;
252 <a name="l00296"></a>00296
253 <a name="l00297"></a>00297 <span class="keywordflow">while</span>(blkCnt > 0u)
254 <a name="l00298"></a>00298 {
255 <a name="l00299"></a>00299 <span class="comment">/* Copy decimation factor number of new input samples into the state buffer */</span>
256 <a name="l00300"></a>00300 i = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>;
257 <a name="l00301"></a>00301
258 <a name="l00302"></a>00302 <span class="keywordflow">do</span>
259 <a name="l00303"></a>00303 {
260 <a name="l00304"></a>00304 *pStateCurnt++ = *pSrc++;
261 <a name="l00305"></a>00305
262 <a name="l00306"></a>00306 } <span class="keywordflow">while</span>(--i);
263 <a name="l00307"></a>00307
264 <a name="l00308"></a>00308 <span class="comment">/* Set accumulator to zero */</span>
265 <a name="l00309"></a>00309 sum0 = 0.0f;
266 <a name="l00310"></a>00310
267 <a name="l00311"></a>00311 <span class="comment">/* Initialize state pointer */</span>
268 <a name="l00312"></a>00312 px = pState;
269 <a name="l00313"></a>00313
270 <a name="l00314"></a>00314 <span class="comment">/* Initialize coeff pointer */</span>
271 <a name="l00315"></a>00315 pb = pCoeffs;
272 <a name="l00316"></a>00316
273 <a name="l00317"></a>00317 tapCnt = numTaps;
274 <a name="l00318"></a>00318
275 <a name="l00319"></a>00319 <span class="keywordflow">while</span>(tapCnt > 0u)
276 <a name="l00320"></a>00320 {
277 <a name="l00321"></a>00321 <span class="comment">/* Read coefficients */</span>
278 <a name="l00322"></a>00322 c0 = *pb++;
279 <a name="l00323"></a>00323
280 <a name="l00324"></a>00324 <span class="comment">/* Fetch 1 state variable */</span>
281 <a name="l00325"></a>00325 x0 = *px++;
282 <a name="l00326"></a>00326
283 <a name="l00327"></a>00327 <span class="comment">/* Perform the multiply-accumulate */</span>
284 <a name="l00328"></a>00328 sum0 += x0 * c0;
285 <a name="l00329"></a>00329
286 <a name="l00330"></a>00330 <span class="comment">/* Decrement the loop counter */</span>
287 <a name="l00331"></a>00331 tapCnt--;
288 <a name="l00332"></a>00332 }
289 <a name="l00333"></a>00333
290 <a name="l00334"></a>00334 <span class="comment">/* Advance the state pointer by the decimation factor </span>
291 <a name="l00335"></a>00335 <span class="comment"> * to process the next group of decimation factor number samples */</span>
292 <a name="l00336"></a>00336 pState = pState + S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a76a8b2161731638eb3d67f277919f95d">M</a>;
293 <a name="l00337"></a>00337
294 <a name="l00338"></a>00338 <span class="comment">/* The result is in the accumulator, store in the destination buffer. */</span>
295 <a name="l00339"></a>00339 *pDst++ = sum0;
296 <a name="l00340"></a>00340
297 <a name="l00341"></a>00341 <span class="comment">/* Decrement the loop counter */</span>
298 <a name="l00342"></a>00342 blkCnt--;
299 <a name="l00343"></a>00343 }
300 <a name="l00344"></a>00344
301 <a name="l00345"></a>00345 <span class="comment">/* Processing is complete. </span>
302 <a name="l00346"></a>00346 <span class="comment"> ** Now copy the last numTaps - 1 samples to the start of the state buffer. </span>
303 <a name="l00347"></a>00347 <span class="comment"> ** This prepares the state buffer for the next function call. */</span>
304 <a name="l00348"></a>00348
305 <a name="l00349"></a>00349 <span class="comment">/* Points to the start of the state buffer */</span>
306 <a name="l00350"></a>00350 pStateCurnt = S-><a class="code" href="structarm__fir__decimate__instance__f32.html#a5bddf29aaaf2011d2e3bcec59a83f633">pState</a>;
307 <a name="l00351"></a>00351
308 <a name="l00352"></a>00352 <span class="comment">/* Copy numTaps number of values */</span>
309 <a name="l00353"></a>00353 i = (numTaps - 1u);
310 <a name="l00354"></a>00354
311 <a name="l00355"></a>00355 <span class="comment">/* copy data */</span>
312 <a name="l00356"></a>00356 <span class="keywordflow">while</span>(i > 0u)
313 <a name="l00357"></a>00357 {
314 <a name="l00358"></a>00358 *pStateCurnt++ = *pState++;
315 <a name="l00359"></a>00359
316 <a name="l00360"></a>00360 <span class="comment">/* Decrement the loop counter */</span>
317 <a name="l00361"></a>00361 i--;
318 <a name="l00362"></a>00362 }
319 <a name="l00363"></a>00363
320 <a name="l00364"></a>00364 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
321 <a name="l00365"></a>00365
322 <a name="l00366"></a>00366 }
323 <a name="l00367"></a>00367
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