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| <h1>arm_fft_bin_example_f32.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__fft__bin__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_fft_bin_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 calculation of Max energy bin of </span> |
| <a name="l00011"></a>00011 <span class="comment">* frequency domain of input signal. </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="l00082"></a>00082 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00083"></a>00083 |
| <a name="l00084"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">00084</a> <span class="preprocessor">#define TEST_LENGTH_SAMPLES 2048 </span> |
| <a name="l00085"></a>00085 <span class="preprocessor"></span> |
| <a name="l00086"></a>00086 <span class="comment">/* ------------------------------------------------------------------- </span> |
| <a name="l00087"></a>00087 <span class="comment">* External Input and Output buffer Declarations for FFT Bin Example </span> |
| <a name="l00088"></a>00088 <span class="comment">* ------------------------------------------------------------------- */</span> |
| <a name="l00089"></a>00089 <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__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>[<a class="code" href="arm__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>]; |
| <a name="l00090"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#aaaf907bde12051bc8bb5d48b7d315a35">00090</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__fft__bin__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>/2]; |
| <a name="l00091"></a>00091 |
| <a name="l00092"></a>00092 <span class="comment">/* ------------------------------------------------------------------ </span> |
| <a name="l00093"></a>00093 <span class="comment">* Global variables for FFT Bin Example </span> |
| <a name="l00094"></a>00094 <span class="comment">* ------------------------------------------------------------------- */</span> |
| <a name="l00095"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">00095</a> uint32_t <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a> = 1024; |
| <a name="l00096"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">00096</a> uint32_t <a class="code" href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a> = 0; |
| <a name="l00097"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">00097</a> uint32_t <a class="code" href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a> = 1; |
| <a name="l00098"></a>00098 |
| <a name="l00099"></a>00099 <span class="comment">/* Reference index at which max energy of bin ocuurs */</span> |
| <a name="l00100"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">00100</a> uint32_t <a class="code" href="arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a> = 213, <a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> = 0; |
| <a name="l00101"></a>00101 |
| <a name="l00102"></a>00102 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00103"></a>00103 <span class="comment">* Max magnitude FFT Bin test </span> |
| <a name="l00104"></a>00104 <span class="comment">* ------------------------------------------------------------------- */</span> |
| <a name="l00105"></a>00105 |
| <a name="l00106"></a><a class="code" href="arm__fft__bin__example__f32_8c.html#a52d2cba30e6946c95578be946ac12a65">00106</a> int32_t <a class="code" href="arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>) |
| <a name="l00107"></a>00107 { |
| <a name="l00108"></a>00108 |
| <a name="l00109"></a>00109 <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="l00110"></a>00110 <a class="code" href="structarm__cfft__radix4__instance__f32.html" title="Instance structure for the floating-point CFFT/CIFFT function.">arm_cfft_radix4_instance_f32</a> S; |
| <a name="l00111"></a>00111 <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> maxValue; |
| <a name="l00112"></a>00112 |
| <a name="l00113"></a>00113 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>; |
| <a name="l00114"></a>00114 |
| <a name="l00115"></a>00115 <span class="comment">/* Initialize the CFFT/CIFFT module */</span> |
| <a name="l00116"></a>00116 status = <a class="code" href="group___c_f_f_t___c_i_f_f_t.html#gaf336459f684f0b17bfae539ef1b1b78a" title="Initialization function for the floating-point CFFT/CIFFT.">arm_cfft_radix4_init_f32</a>(&S, <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>, |
| <a name="l00117"></a>00117 <a class="code" href="arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a>); |
| <a name="l00118"></a>00118 |
| <a name="l00119"></a>00119 <span class="comment">/* Process the data through the CFFT/CIFFT module */</span> |
| <a name="l00120"></a>00120 <a class="code" href="group___c_f_f_t___c_i_f_f_t.html#ga521f670cd9c571bc61aff9bec89f4c26" title="Processing function for the floating-point CFFT/CIFFT.">arm_cfft_radix4_f32</a>(&S, <a class="code" href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>); |
| <a name="l00121"></a>00121 |
| <a name="l00122"></a>00122 |
| <a name="l00123"></a>00123 <span class="comment">/* Process the data through the Complex Magnitude Module for </span> |
| <a name="l00124"></a>00124 <span class="comment"> calculating the magnitude at each bin */</span> |
| <a name="l00125"></a>00125 <a class="code" href="group__cmplx__mag.html#gae45024c497392cde2ae358a76d435213" title="Floating-point complex magnitude.">arm_cmplx_mag_f32</a>(<a class="code" href="arm__fft__bin__example__f32_8c.html#a3d8ecb82590486ceebccc76263963b16">testInput_f32_10khz</a>, <a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>, |
| <a name="l00126"></a>00126 <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>); |
| <a name="l00127"></a>00127 |
| <a name="l00128"></a>00128 <span class="comment">/* Calculates maxValue and returns corresponding BIN value */</span> |
| <a name="l00129"></a>00129 <a class="code" href="group___max.html#ga5b89d1b04575aeec494f678695fb87d8" title="Maximum value of a floating-point vector.">arm_max_f32</a>(<a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>, <a class="code" href="arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>, &maxValue, &<a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a>); |
| <a name="l00130"></a>00130 |
| <a name="l00131"></a>00131 <span class="keywordflow">if</span>(<a class="code" href="arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> != <a class="code" href="arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a>) |
| <a name="l00132"></a>00132 { |
| <a name="l00133"></a>00133 status = <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>; |
| <a name="l00134"></a>00134 } |
| <a name="l00135"></a>00135 |
| <a name="l00136"></a>00136 <span class="comment">/* ---------------------------------------------------------------------- </span> |
| <a name="l00137"></a>00137 <span class="comment"> ** Loop here if the signals fail the PASS check. </span> |
| <a name="l00138"></a>00138 <span class="comment"> ** This denotes a test failure </span> |
| <a name="l00139"></a>00139 <span class="comment"> ** ------------------------------------------------------------------- */</span> |
| <a name="l00140"></a>00140 |
| <a name="l00141"></a>00141 <span class="keywordflow">if</span>( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>) |
| <a name="l00142"></a>00142 { |
| <a name="l00143"></a>00143 <span class="keywordflow">while</span>(1); |
| <a name="l00144"></a>00144 } |
| <a name="l00145"></a>00145 } |
| <a name="l00146"></a>00146 |
| </pre></div></div> |
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