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&#160;<span id="projectnumber">Version 1.5.1</span>
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<div class="title">arm_fir_example_f32.c</div> </div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * Copyright (C) 2010-2012 ARM Limited. All rights reserved.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment">* $Date: 17. January 2013</span></div>
<div class="line"><span class="comment">* $Revision: V1.4.0</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Project: CMSIS DSP Library</span></div>
<div class="line"><span class="comment"> * Title: arm_fir_example_f32.c</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Description: Example code demonstrating how an FIR filter can be used</span></div>
<div class="line"><span class="comment"> * as a low pass filter.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Target Processor: Cortex-M4/Cortex-M3</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment">* Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><span class="comment">* modification, are permitted provided that the following conditions</span></div>
<div class="line"><span class="comment">* are met:</span></div>
<div class="line"><span class="comment">* - Redistributions of source code must retain the above copyright</span></div>
<div class="line"><span class="comment">* notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><span class="comment">* - Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><span class="comment">* notice, this list of conditions and the following disclaimer in</span></div>
<div class="line"><span class="comment">* the documentation and/or other materials provided with the</span></div>
<div class="line"><span class="comment">* distribution.</span></div>
<div class="line"><span class="comment">* - Neither the name of ARM LIMITED nor the names of its contributors</span></div>
<div class="line"><span class="comment">* may be used to endorse or promote products derived from this</span></div>
<div class="line"><span class="comment">* software without specific prior written permission.</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><span class="comment">* &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><span class="comment">* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><span class="comment">* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE</span></div>
<div class="line"><span class="comment">* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,</span></div>
<div class="line"><span class="comment">* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,</span></div>
<div class="line"><span class="comment">* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;</span></div>
<div class="line"><span class="comment">* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER</span></div>
<div class="line"><span class="comment">* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span></div>
<div class="line"><span class="comment">* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN</span></div>
<div class="line"><span class="comment">* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><span class="comment">* POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><span class="comment"> * -------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">** Include Files</span></div>
<div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span></div>
<div class="line"><span class="preprocessor">#include &quot;math_helper.h&quot;</span></div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">** Macro Defines</span></div>
<div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define TEST_LENGTH_SAMPLES 320</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define SNR_THRESHOLD_F32 140.0f</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define BLOCK_SIZE 32</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define NUM_TAPS 29</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * The input signal and reference output (computed with MATLAB)</span></div>
<div class="line"><span class="comment"> * are defined externally in arm_fir_lpf_data.c.</span></div>
<div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">extern</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a0"></a><a class="code" href="arm__fir__example__f32_8c.html#a35d190391c204b677e2839d76ede6e8b">testInput_f32_1kHz_15kHz</a>[<a name="a1"></a><a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
<div class="line"><span class="keyword">extern</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a2"></a><a class="code" href="arm__fir__example__f32_8c.html#a12d0acaa028f1dcd964d2d188e7df331">refOutput</a>[<a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
<div class="line"></div>
<div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * Declare Test output buffer</span></div>
<div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a3"></a><a class="code" href="arm__fir__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[<a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];</div>
<div class="line"></div>
<div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * Declare State buffer of size (numTaps + blockSize - 1)</span></div>
<div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">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>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">** FIR Coefficients buffer generated using fir1() MATLAB function.</span></div>
<div class="line"><span class="comment">** fir1(28, 6/24)</span></div>
<div class="line"><span class="comment">** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">const</span> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">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>
<div class="line"> -0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f, +0.0085302217f, -0.0000000000f, -0.0173976984f,</div>
<div class="line"> -0.0341458607f, -0.0333591565f, +0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f, +0.2229246956f,</div>
<div class="line"> +0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f, -0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f,</div>
<div class="line"> +0.0080754303f, +0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * Global variables for FIR LPF Example</span></div>
<div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<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>
<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="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>/<a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">BLOCK_SIZE</a>;</div>
<div class="line"></div>
<div class="line"><a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> <a name="a10"></a><a class="code" href="arm__fir__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a>;</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> * FIR LPF Example</span></div>
<div class="line"><span class="comment"> * ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line">int32_t <a name="a11"></a><a class="code" href="arm__fir__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">main</a>(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> uint32_t i;</div>
<div class="line"> <a name="_a12"></a><a class="code" href="structarm__fir__instance__f32.html">arm_fir_instance_f32</a> S;</div>
<div class="line"> <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6">arm_status</a> <a name="a13"></a><a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;</div>
<div class="line"> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *inputF32, *outputF32;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Initialize input and output buffer pointers */</span></div>
<div class="line"> inputF32 = &amp;<a class="code" href="arm__fir__example__f32_8c.html#a35d190391c204b677e2839d76ede6e8b">testInput_f32_1kHz_15kHz</a>[0];</div>
<div class="line"> outputF32 = &amp;<a class="code" href="arm__fir__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0];</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Call FIR init function to initialize the instance structure. */</span></div>
<div class="line"> <a name="a14"></a><a class="code" href="group__FIR.html#ga98d13def6427e29522829f945d0967db">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">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>
<div class="line"></div>
<div class="line"> <span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> ** Call the FIR process function for every blockSize samples</span></div>
<div class="line"><span class="comment"> ** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<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>
<div class="line"> {</div>
<div class="line"> <a name="a15"></a><a class="code" href="group__FIR.html#gae8fb334ea67eb6ecbd31824ddc14cd6a">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>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> ** Compare the generated output against the reference output computed</span></div>
<div class="line"><span class="comment"> ** in MATLAB.</span></div>
<div class="line"><span class="comment"> ** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"> <a class="code" href="arm__fir__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a> = <a name="a16"></a><a class="code" href="arm__convolution__example_2math__helper_8c.html#aeea2952e70a1040a6efa555564bbeeab">arm_snr_f32</a>(&amp;<a class="code" href="arm__fir__example__f32_8c.html#a12d0acaa028f1dcd964d2d188e7df331">refOutput</a>[0], &amp;<a class="code" href="arm__fir__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0], <a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="arm__fir__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>
<div class="line"> {</div>
<div class="line"> status = <a name="a18"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> {</div>
<div class="line"> status = <a name="a19"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> ** Loop here if the signal does not match the reference output.</span></div>
<div class="line"><span class="comment"> ** ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)</div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">while</span> (1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">while</span> (1); <span class="comment">/* main function does not return */</span></div>
<div class="line">}</div>
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