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| <div class="header"> |
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| <h1>arm_fir_example_f32.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__fir__example__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: 29. November 2010 </span> |
| <a name="l00005"></a>00005 <span class="comment"> * $Revision: V1.0.3 </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_example_f32.c </span> |
| <a name="l00009"></a>00009 <span class="comment"> * </span> |
| <a name="l00010"></a>00010 <span class="comment"> * Description: Example code demonstrating how an FIR filter can be used</span> |
| <a name="l00011"></a>00011 <span class="comment"> * as a low pass filter.</span> |
| <a name="l00012"></a>00012 <span class="comment"> * </span> |
| <a name="l00013"></a>00013 <span class="comment"> * Target Processor: Cortex-M4/Cortex-M3 </span> |
| <a name="l00014"></a>00014 <span class="comment"> *</span> |
| <a name="l00015"></a>00015 <span class="comment"> *</span> |
| <a name="l00016"></a>00016 <span class="comment"> * Version 1.0.3 2010/11/29 </span> |
| <a name="l00017"></a>00017 <span class="comment"> * Re-organized the CMSIS folders and updated documentation. </span> |
| <a name="l00018"></a>00018 <span class="comment"> * </span> |
| <a name="l00019"></a>00019 <span class="comment"> * Version 1.0.1 2010/10/05 KK </span> |
| <a name="l00020"></a>00020 <span class="comment"> * Production release and review comments incorporated. </span> |
| <a name="l00021"></a>00021 <span class="comment"> *</span> |
| <a name="l00022"></a>00022 <span class="comment"> * Version 1.0.0 2010/09/20 KK</span> |
| <a name="l00023"></a>00023 <span class="comment"> * Production release and review comments incorporated.</span> |
| <a name="l00024"></a>00024 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00025"></a>00025 |
| <a name="l00105"></a>00105 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00106"></a>00106 <span class="comment">** Include Files </span> |
| <a name="l00107"></a>00107 <span class="comment">** ------------------------------------------------------------------- */</span> |
| <a name="l00108"></a>00108 |
| <a name="l00109"></a>00109 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00110"></a>00110 <span class="preprocessor">#include "math_helper.h"</span> |
| <a name="l00111"></a>00111 |
| <a name="l00112"></a>00112 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00113"></a>00113 <span class="comment">** Macro Defines </span> |
| <a name="l00114"></a>00114 <span class="comment">** ------------------------------------------------------------------- */</span> |
| <a name="l00115"></a>00115 |
| <a name="l00116"></a><a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">00116</a> <span class="preprocessor">#define TEST_LENGTH_SAMPLES 320 </span> |
| <a name="l00117"></a><a class="code" href="arm__fir__example__f32_8c.html#af7d1dd4deffa8e7ed6429e5dd0fe1812">00117</a> <span class="preprocessor"></span><span class="preprocessor">#define SNR_THRESHOLD_F32 140.0f </span> |
| <a name="l00118"></a><a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">00118</a> <span class="preprocessor"></span><span class="preprocessor">#define BLOCK_SIZE 32 </span> |
| <a name="l00119"></a><a class="code" href="arm__fir__example__f32_8c.html#a7579d94e0a80fb9d376ea6c7897f73b0">00119</a> <span class="preprocessor"></span><span class="preprocessor">#define NUM_TAPS 29 </span> |
| <a name="l00120"></a>00120 <span class="preprocessor"></span> |
| <a name="l00121"></a>00121 <span class="comment">/* ------------------------------------------------------------------- </span> |
| <a name="l00122"></a>00122 <span class="comment"> * The input signal and reference output (computed with MATLAB)</span> |
| <a name="l00123"></a>00123 <span class="comment"> * are defined externally in arm_fir_lpf_data.c.</span> |
| <a name="l00124"></a>00124 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00125"></a>00125 |
| <a name="l00126"></a>00126 <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 class="code" href="arm__fir__example__f32_8c.html#a35d190391c204b677e2839d76ede6e8b">testInput_f32_1kHz_15kHz</a>[<a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>]; |
| <a name="l00127"></a>00127 <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 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>]; |
| <a name="l00128"></a>00128 |
| <a name="l00129"></a>00129 <span class="comment">/* ------------------------------------------------------------------- </span> |
| <a name="l00130"></a>00130 <span class="comment"> * Declare Test output buffer </span> |
| <a name="l00131"></a>00131 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00132"></a>00132 |
| <a name="l00133"></a><a class="code" href="arm__fir__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">00133</a> <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 class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[<a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>]; |
| <a name="l00134"></a>00134 |
| <a name="l00135"></a>00135 <span class="comment">/* ------------------------------------------------------------------- </span> |
| <a name="l00136"></a>00136 <span class="comment"> * Declare State buffer of size (numTaps + blockSize - 1) </span> |
| <a name="l00137"></a>00137 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00138"></a>00138 |
| <a name="l00139"></a><a class="code" href="arm__fir__example__f32_8c.html#a46d61cabe5cb207f2776e1d4f8ca0f38">00139</a> <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 class="code" href="arm__fir__example__f32_8c.html#a46d61cabe5cb207f2776e1d4f8ca0f38">firStateF32</a>[<a class="code" href="arm__fir__example__f32_8c.html#ad51ded0bbd705f02f73fc60c0b721ced">BLOCK_SIZE</a> + <a class="code" href="arm__fir__example__f32_8c.html#a7579d94e0a80fb9d376ea6c7897f73b0">NUM_TAPS</a> - 1]; |
| <a name="l00140"></a>00140 |
| <a name="l00141"></a>00141 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00142"></a>00142 <span class="comment">** FIR Coefficients buffer generated using fir1() MATLAB function. </span> |
| <a name="l00143"></a>00143 <span class="comment">** fir1(28, 6/24)</span> |
| <a name="l00144"></a>00144 <span class="comment">** ------------------------------------------------------------------- */</span> |
| <a name="l00145"></a>00145 |
| <a name="l00146"></a><a class="code" href="arm__fir__example__f32_8c.html#ae070afd14f437ad1ae0a947e4403dd0e">00146</a> <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 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>] = { |
| <a name="l00147"></a>00147 -0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f, +0.0085302217f, -0.0000000000f, -0.0173976984f, |
| <a name="l00148"></a>00148 -0.0341458607f, -0.0333591565f, +0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f, +0.2229246956f, |
| <a name="l00149"></a>00149 +0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f, -0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f, |
| <a name="l00150"></a>00150 +0.0080754303f, +0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f |
| <a name="l00151"></a>00151 }; |
| <a name="l00152"></a>00152 |
| <a name="l00153"></a>00153 <span class="comment">/* ------------------------------------------------------------------ </span> |
| <a name="l00154"></a>00154 <span class="comment"> * Global variables for FIR LPF Example </span> |
| <a name="l00155"></a>00155 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00156"></a>00156 |
| <a name="l00157"></a><a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">00157</a> uint32_t <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>; |
| <a name="l00158"></a><a class="code" href="arm__fir__example__f32_8c.html#af7d5613bda9a19b2ccae5d6cb79a22bc">00158</a> uint32_t <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>; |
| <a name="l00159"></a>00159 |
| <a name="l00160"></a><a class="code" href="arm__fir__example__f32_8c.html#af06013f588a7003278de222913c9d819">00160</a> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a class="code" href="arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a>; |
| <a name="l00161"></a>00161 |
| <a name="l00162"></a>00162 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00163"></a>00163 <span class="comment"> * FIR LPF Example </span> |
| <a name="l00164"></a>00164 <span class="comment"> * ------------------------------------------------------------------- */</span> |
| <a name="l00165"></a>00165 |
| <a name="l00166"></a><a class="code" href="arm__fir__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">00166</a> int32_t <a class="code" href="arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>) |
| <a name="l00167"></a>00167 { |
| <a name="l00168"></a>00168 uint32_t i; |
| <a name="l00169"></a>00169 <a class="code" href="structarm__fir__instance__f32.html" title="Instance structure for the floating-point FIR filter.">arm_fir_instance_f32</a> S; |
| <a name="l00170"></a>00170 <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>; |
| <a name="l00171"></a>00171 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *inputF32, *outputF32; |
| <a name="l00172"></a>00172 |
| <a name="l00173"></a>00173 <span class="comment">/* Initialize input and output buffer pointers */</span> |
| <a name="l00174"></a>00174 inputF32 = &<a class="code" href="arm__fir__example__f32_8c.html#a35d190391c204b677e2839d76ede6e8b">testInput_f32_1kHz_15kHz</a>[0]; |
| <a name="l00175"></a>00175 outputF32 = &<a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0]; |
| <a name="l00176"></a>00176 |
| <a name="l00177"></a>00177 <span class="comment">/* Call FIR init function to initialize the instance structure. */</span> |
| <a name="l00178"></a>00178 <a class="code" href="group___f_i_r.html#ga98d13def6427e29522829f945d0967db" title="Initialization function for the floating-point FIR filter.">arm_fir_init_f32</a>(&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> *)&<a class="code" href="arm__fir__example__f32_8c.html#ae070afd14f437ad1ae0a947e4403dd0e">firCoeffs32</a>[0], &<a class="code" href="arm__fir__example__f32_8c.html#a46d61cabe5cb207f2776e1d4f8ca0f38">firStateF32</a>[0], <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>); |
| <a name="l00179"></a>00179 |
| <a name="l00180"></a>00180 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00181"></a>00181 <span class="comment"> ** Call the FIR process function for every blockSize samples </span> |
| <a name="l00182"></a>00182 <span class="comment"> ** ------------------------------------------------------------------- */</span> |
| <a name="l00183"></a>00183 |
| <a name="l00184"></a>00184 <span class="keywordflow">for</span>(i=0; i < <a class="code" href="arm__fir__example__f32_8c.html#af7d5613bda9a19b2ccae5d6cb79a22bc">numBlocks</a>; i++) |
| <a name="l00185"></a>00185 { |
| <a name="l00186"></a>00186 <a class="code" href="group___f_i_r.html#gae8fb334ea67eb6ecbd31824ddc14cd6a" title="Processing function for the floating-point FIR filter.">arm_fir_f32</a>(&S, inputF32 + (i * <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>), outputF32 + (i * blockSize), blockSize); |
| <a name="l00187"></a>00187 } |
| <a name="l00188"></a>00188 |
| <a name="l00189"></a>00189 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00190"></a>00190 <span class="comment"> ** Compare the generated output against the reference output computed</span> |
| <a name="l00191"></a>00191 <span class="comment"> ** in MATLAB.</span> |
| <a name="l00192"></a>00192 <span class="comment"> ** ------------------------------------------------------------------- */</span> |
| <a name="l00193"></a>00193 |
| <a name="l00194"></a>00194 <a class="code" href="arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a> = arm_snr_f32(&<a class="code" href="arm__fir__example__f32_8c.html#a12d0acaa028f1dcd964d2d188e7df331">refOutput</a>[0], &<a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[0], <a class="code" href="arm__fir__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>); |
| <a name="l00195"></a>00195 |
| <a name="l00196"></a>00196 <span class="keywordflow">if</span> (<a class="code" href="arm__convolution__example__f32_8c.html#af06013f588a7003278de222913c9d819">snr</a> < <a class="code" href="arm__fir__example__f32_8c.html#af7d1dd4deffa8e7ed6429e5dd0fe1812">SNR_THRESHOLD_F32</a>) |
| <a name="l00197"></a>00197 { |
| <a name="l00198"></a>00198 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>; |
| <a name="l00199"></a>00199 } |
| <a name="l00200"></a>00200 <span class="keywordflow">else</span> |
| <a name="l00201"></a>00201 { |
| <a name="l00202"></a>00202 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>; |
| <a name="l00203"></a>00203 } |
| <a name="l00204"></a>00204 |
| <a name="l00205"></a>00205 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00206"></a>00206 <span class="comment"> ** Loop here if the signal does not match the reference output.</span> |
| <a name="l00207"></a>00207 <span class="comment"> ** ------------------------------------------------------------------- */</span> |
| <a name="l00208"></a>00208 |
| <a name="l00209"></a>00209 <span class="keywordflow">if</span>( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>) |
| <a name="l00210"></a>00210 { |
| <a name="l00211"></a>00211 <span class="keywordflow">while</span>(1); |
| <a name="l00212"></a>00212 } |
| <a name="l00213"></a>00213 } |
| <a name="l00214"></a>00214 |
| </pre></div></div> |
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