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arm_fir_example_f32_8c-example.html

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    111. 

  111. <div class="title">arm_fir_example_f32.c</div>  </div>
    112. 

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    113. 

  113. <div class="contents">
    114. 

  114. <div class="fragment"><div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
    115. 

  115. <div class="line"><span class="comment"> * Copyright (C) 2010-2012 ARM Limited. All rights reserved.</span></div>
    116. 

  116. <div class="line"><span class="comment"> *</span></div>
    117. 

  117. <div class="line"><span class="comment">* $Date:         17. January 2013</span></div>
    118. 

  118. <div class="line"><span class="comment">* $Revision:     V1.4.0</span></div>
    119. 

  119. <div class="line"><span class="comment">*</span></div>
    120. 

  120. <div class="line"><span class="comment">* Project:       CMSIS DSP Library</span></div>
    121. 

  121. <div class="line"><span class="comment"> * Title:        arm_fir_example_f32.c</span></div>
    122. 

  122. <div class="line"><span class="comment"> *</span></div>
    123. 

  123. <div class="line"><span class="comment"> * Description:  Example code demonstrating how an FIR filter can be used</span></div>
    124. 

  124. <div class="line"><span class="comment"> *               as a low pass filter.</span></div>
    125. 

  125. <div class="line"><span class="comment"> *</span></div>
    126. 

  126. <div class="line"><span class="comment"> * Target Processor: Cortex-M4/Cortex-M3</span></div>
    127. 

  127. <div class="line"><span class="comment"> *</span></div>
    128. 

  128. <div class="line"><span class="comment">* Redistribution and use in source and binary forms, with or without</span></div>
    129. 

  129. <div class="line"><span class="comment">* modification, are permitted provided that the following conditions</span></div>
    130. 

  130. <div class="line"><span class="comment">* are met:</span></div>
    131. 

  131. <div class="line"><span class="comment">*   - Redistributions of source code must retain the above copyright</span></div>
    132. 

  132. <div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer.</span></div>
    133. 

  133. <div class="line"><span class="comment">*   - Redistributions in binary form must reproduce the above copyright</span></div>
    134. 

  134. <div class="line"><span class="comment">*     notice, this list of conditions and the following disclaimer in</span></div>
    135. 

  135. <div class="line"><span class="comment">*     the documentation and/or other materials provided with the</span></div>
    136. 

  136. <div class="line"><span class="comment">*     distribution.</span></div>
    137. 

  137. <div class="line"><span class="comment">*   - Neither the name of ARM LIMITED nor the names of its contributors</span></div>
    138. 

  138. <div class="line"><span class="comment">*     may be used to endorse or promote products derived from this</span></div>
    139. 

  139. <div class="line"><span class="comment">*     software without specific prior written permission.</span></div>
    140. 

  140. <div class="line"><span class="comment">*</span></div>
    141. 

  141. <div class="line"><span class="comment">* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
    142. 

  142. <div class="line"><span class="comment">* &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
    143. 

  143. <div class="line"><span class="comment">* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
    144. 

  144. <div class="line"><span class="comment">* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE</span></div>
    145. 

  145. <div class="line"><span class="comment">* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</span></div>
    146. 

  146. <div class="line"><span class="comment">* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div>
    147. 

  147. <div class="line"><span class="comment">* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span></div>
    148. 

  148. <div class="line"><span class="comment">* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER</span></div>
    149. 

  149. <div class="line"><span class="comment">* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span></div>
    150. 

  150. <div class="line"><span class="comment">* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN</span></div>
    151. 

  151. <div class="line"><span class="comment">* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
    152. 

  152. <div class="line"><span class="comment">* POSSIBILITY OF SUCH DAMAGE.</span></div>
    153. 

  153. <div class="line"><span class="comment"> * -------------------------------------------------------------------- */</span></div>
    154. 

  154. <div class="line"></div>
    155. 

  155. <div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
    156. 

  156. <div class="line"><span class="comment">** Include Files</span></div>
    157. 

  157. <div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
    158. 

  158. <div class="line"></div>
    159. 

  159. <div class="line"><span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span></div>
    160. 

  160. <div class="line"><span class="preprocessor">#include &quot;math_helper.h&quot;</span></div>
    161. 

  161. <div class="line"></div>
    162. 

  162. <div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
    163. 

  163. <div class="line"><span class="comment">** Macro Defines</span></div>
    164. 

  164. <div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
    165. 

  165. <div class="line"></div>
    166. 

  166. <div class="line"><span class="preprocessor">#define TEST_LENGTH_SAMPLES  320</span></div>
    167. 

  167. <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define SNR_THRESHOLD_F32    140.0f</span></div>
    168. 

  168. <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define BLOCK_SIZE            32</span></div>
    169. 

  169. <div class="line"><span class="preprocessor"></span><span class="preprocessor">#define NUM_TAPS              29</span></div>
    170. 

  170. <div class="line"><span class="preprocessor"></span></div>
    171. 

  171. <div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
    172. 

  172. <div class="line"><span class="comment"> * The input signal and reference output (computed with MATLAB)</span></div>
    173. 

  173. <div class="line"><span class="comment"> * are defined externally in arm_fir_lpf_data.c.</span></div>
    174. 

  174. <div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
    175. 

  175. <div class="line"></div>
    176. 

  176. <div class="line"><span class="keyword">extern</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a0"></a><a class="code" href="arm__fir__data_8c.html#a143154a165358f0016714cb7f1c83970">testInput_f32_1kHz_15kHz</a>[<a name="a1"></a><a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
    177. 

  177. <div class="line"><span class="keyword">extern</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a2"></a><a class="code" href="arm__fir__data_8c.html#aa7570f8c2e7a3c929d9d32a14a51389f">refOutput</a>[<a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
    178. 

  178. <div class="line"></div>
    179. 

  179. <div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
    180. 

  180. <div class="line"><span class="comment"> * Declare Test output buffer</span></div>
    181. 

  181. <div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
    182. 

  182. <div class="line"></div>
    183. 

  183. <div class="line"><span class="keyword">static</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a3"></a><a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[<a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
    184. 

  184. <div class="line"></div>
    185. 

  185. <div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
    186. 

  186. <div class="line"><span class="comment"> * Declare State buffer of size (numTaps + blockSize - 1)</span></div>
    187. 

  187. <div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
    188. 

  188. <div class="line"></div>
    189. 

  189. <div class="line"><span class="keyword">static</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a4"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a358ec4e79689e6d3787b89fe78bdb772">firStateF32</a>[<a name="a5"></a><a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">BLOCK_SIZE</a> + <a name="a6"></a><a class="code" href="arm__fir__example__f32_8c.html#a7579d94e0a80fb9d376ea6c7897f73b0">NUM_TAPS</a> - 1];</div>
    190. 

  190. <div class="line"></div>
    191. 

  191. <div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
    192. 

  192. <div class="line"><span class="comment">** FIR Coefficients buffer generated using fir1() MATLAB function.</span></div>
    193. 

  193. <div class="line"><span class="comment">** fir1(28, 6/24)</span></div>
    194. 

  194. <div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
    195. 

  195. <div class="line"></div>
    196. 

  196. <div class="line"><span class="keyword">const</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a7"></a><a class="code" href="arm__fir__example__f32_8c.html#ae070afd14f437ad1ae0a947e4403dd0e">firCoeffs32</a>[<a class="code" href="arm__fir__example__f32_8c.html#a7579d94e0a80fb9d376ea6c7897f73b0">NUM_TAPS</a>] = {</div>
    197. 

  197. <div class="line">  -0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f, +0.0085302217f, -0.0000000000f, -0.0173976984f,</div>
    198. 

  198. <div class="line">  -0.0341458607f, -0.0333591565f, +0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f, +0.2229246956f,</div>
    199. 

  199. <div class="line">  +0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f, -0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f,</div>
    200. 

  200. <div class="line">  +0.0080754303f, +0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f</div>
    201. 

  201. <div class="line">};</div>
    202. 

  202. <div class="line"></div>
    203. 

  203. <div class="line"><span class="comment">/* ------------------------------------------------------------------</span></div>
    204. 

  204. <div class="line"><span class="comment"> * Global variables for FIR LPF Example</span></div>
    205. 

  205. <div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
    206. 

  206. <div class="line"></div>
    207. 

  207. <div class="line">uint32_t <a name="a8"></a><a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a> = <a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">BLOCK_SIZE</a>;</div>
    208. 

  208. <div class="line">uint32_t <a name="a9"></a><a class="code" href="arm__fir__example__f32_8c.html#af7d5613bda9a19b2ccae5d6cb79a22bc">numBlocks</a> = <a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>/<a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">BLOCK_SIZE</a>;</div>
    209. 

  209. <div class="line"></div>
    210. 

  210. <div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>  <a name="a10"></a><a class="code" href="_a_r_m_2arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a>;</div>
    211. 

  211. <div class="line"></div>
    212. 

  212. <div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
    213. 

  213. <div class="line"><span class="comment"> * FIR LPF Example</span></div>
    214. 

  214. <div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
    215. 

  215. <div class="line"></div>
    216. 

  216. <div class="line">int32_t <a name="a11"></a><a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>)</div>
    217. 

  217. <div class="line">{</div>
    218. 

  218. <div class="line">  uint32_t i;</div>
    219. 

  219. <div class="line">  <a name="_a12"></a><a class="code" href="structarm__fir__instance__f32.html" title="Instance structure for the floating-point FIR filter.">arm_fir_instance_f32</a> S;</div>
    220. 

  220. <div class="line">  <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a name="a13"></a><a class="code" href="_a_r_m_2arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;</div>
    221. 

  221. <div class="line">  <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>  *inputF32, *outputF32;</div>
    222. 

  222. <div class="line"></div>
    223. 

  223. <div class="line">  <span class="comment">/* Initialize input and output buffer pointers */</span></div>
    224. 

  224. <div class="line">  inputF32 = &amp;<a class="code" href="arm__fir__data_8c.html#a143154a165358f0016714cb7f1c83970">testInput_f32_1kHz_15kHz</a>[0];</div>
    225. 

  225. <div class="line">  outputF32 = &amp;<a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0];</div>
    226. 

  226. <div class="line"></div>
    227. 

  227. <div class="line">  <span class="comment">/* Call FIR init function to initialize the instance structure. */</span></div>
    228. 

  228. <div class="line">  <a name="a14"></a><a class="code" href="group___f_i_r.html#ga98d13def6427e29522829f945d0967db" title="Initialization function for the floating-point FIR filter.">arm_fir_init_f32</a>(&amp;S, <a class="code" href="arm__fir__example__f32_8c.html#a7579d94e0a80fb9d376ea6c7897f73b0">NUM_TAPS</a>, (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *)&amp;<a class="code" href="arm__fir__example__f32_8c.html#ae070afd14f437ad1ae0a947e4403dd0e">firCoeffs32</a>[0], &amp;<a class="code" href="arm__signal__converge__example__f32_8c.html#a358ec4e79689e6d3787b89fe78bdb772">firStateF32</a>[0], <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);</div>
    229. 

  229. <div class="line"></div>
    230. 

  230. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------</span></div>
    231. 

  231. <div class="line"><span class="comment">  ** Call the FIR process function for every blockSize samples</span></div>
    232. 

  232. <div class="line"><span class="comment">  ** ------------------------------------------------------------------- */</span></div>
    233. 

  233. <div class="line"></div>
    234. 

  234. <div class="line">  <span class="keywordflow">for</span>(i=0; i &lt; <a class="code" href="arm__fir__example__f32_8c.html#af7d5613bda9a19b2ccae5d6cb79a22bc">numBlocks</a>; i++)</div>
    235. 

  235. <div class="line">  {</div>
    236. 

  236. <div class="line">    <a name="a15"></a><a class="code" href="group___f_i_r.html#gae8fb334ea67eb6ecbd31824ddc14cd6a" title="Processing function for the floating-point FIR filter.">arm_fir_f32</a>(&amp;S, inputF32 + (i * <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>), outputF32 + (i * blockSize), blockSize);</div>
    237. 

  237. <div class="line">  }</div>
    238. 

  238. <div class="line"></div>
    239. 

  239. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------</span></div>
    240. 

  240. <div class="line"><span class="comment">  ** Compare the generated output against the reference output computed</span></div>
    241. 

  241. <div class="line"><span class="comment">  ** in MATLAB.</span></div>
    242. 

  242. <div class="line"><span class="comment">  ** ------------------------------------------------------------------- */</span></div>
    243. 

  243. <div class="line"></div>
    244. 

  244. <div class="line">  <a class="code" href="_a_r_m_2arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a> = <a name="a16"></a><a class="code" href="arm__convolution__example_2_a_r_m_2math__helper_8c.html#aeea2952e70a1040a6efa555564bbeeab" title="Caluclation of SNR.">arm_snr_f32</a>(&amp;<a class="code" href="arm__fir__data_8c.html#aa7570f8c2e7a3c929d9d32a14a51389f">refOutput</a>[0], &amp;<a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0], <a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>);</div>
    245. 

  245. <div class="line"></div>
    246. 

  246. <div class="line">  <span class="keywordflow">if</span> (<a class="code" href="_a_r_m_2arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a> &lt; <a name="a17"></a><a class="code" href="arm__fir__example__f32_8c.html#af7d1dd4deffa8e7ed6429e5dd0fe1812">SNR_THRESHOLD_F32</a>)</div>
    247. 

  247. <div class="line">  {</div>
    248. 

  248. <div class="line">    status = <a name="a18"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;</div>
    249. 

  249. <div class="line">  }</div>
    250. 

  250. <div class="line">  <span class="keywordflow">else</span></div>
    251. 

  251. <div class="line">  {</div>
    252. 

  252. <div class="line">    status = <a name="a19"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;</div>
    253. 

  253. <div class="line">  }</div>
    254. 

  254. <div class="line"></div>
    255. 

  255. <div class="line">  <span class="comment">/* ----------------------------------------------------------------------</span></div>
    256. 

  256. <div class="line"><span class="comment">  ** Loop here if the signal does not match the reference output.</span></div>
    257. 

  257. <div class="line"><span class="comment">  ** ------------------------------------------------------------------- */</span></div>
    258. 

  258. <div class="line"></div>
    259. 

  259. <div class="line">  <span class="keywordflow">if</span>( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)</div>
    260. 

  260. <div class="line">  {</div>
    261. 

  261. <div class="line">    <span class="keywordflow">while</span>(1);</div>
    262. 

  262. <div class="line">  }</div>
    263. 

  263. <div class="line"></div>
    264. 

  264. <div class="line">  <span class="keywordflow">while</span>(1);                             <span class="comment">/* main function does not return */</span></div>
    265. 

  265. <div class="line">}</div>
    266. 

  266. <div class="line"></div>
    267. 

  267. </div><!-- fragment --> </div><!-- contents -->
    268. 

  268. </div><!-- doc-content -->
    269. 

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