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<div class="title">arm_fft_bin_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_fft_bin_example_f32.c</span></div>
<div class="line"><span class="comment">*</span></div>
<div class="line"><span class="comment">* Description: Example code demonstrating calculation of Max energy bin of</span></div>
<div class="line"><span class="comment">* frequency domain of input signal.</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">* "AS IS" 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="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="arm__const__structs_8h.html">arm_const_structs.h</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define TEST_LENGTH_SAMPLES 2048</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="comment">/* -------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* External Input and Output buffer Declarations for FFT Bin Example</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<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="_a_r_m_2arm__fft__bin__data_8c.html#a8a12a8ec4b866be84f4b7d3daf6a1242">testInput_f32_10khz</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>
<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="a2"></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>/2];</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Global variables for FFT Bin Example</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line">uint32_t <a name="a3"></a><a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a> = 1024;</div>
<div class="line">uint32_t <a name="a4"></a><a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a> = 0;</div>
<div class="line">uint32_t <a name="a5"></a><a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a> = 1;</div>
<div class="line"></div>
<div class="line"><span class="comment">/* Reference index at which max energy of bin ocuurs */</span></div>
<div class="line">uint32_t <a name="a6"></a><a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a> = 213, <a name="a7"></a><a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> = 0;</div>
<div class="line"></div>
<div class="line"><span class="comment">/* ----------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">* Max magnitude FFT Bin test</span></div>
<div class="line"><span class="comment">* ------------------------------------------------------------------- */</span></div>
<div class="line"></div>
<div class="line">int32_t <a name="a8"></a><a class="code" href="_a_r_m_2arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"></div>
<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="a9"></a><a class="code" href="_a_r_m_2arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;</div>
<div class="line"> <a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> maxValue;</div>
<div class="line"></div>
<div class="line"> status = <a name="a10"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Process the data through the CFFT/CIFFT module */</span></div>
<div class="line"> <a name="a11"></a><a class="code" href="group___complex_f_f_t.html#gade0f9c4ff157b6b9c72a1eafd86ebf80" title="Processing function for the floating-point complex FFT.">arm_cfft_f32</a>(&<a name="a12"></a><a class="code" href="arm__const__structs_8c.html#a05abc294a9159abbd6ffb4f188fe18b1">arm_cfft_sR_f32_len1024</a>, <a class="code" href="_a_r_m_2arm__fft__bin__data_8c.html#a8a12a8ec4b866be84f4b7d3daf6a1242">testInput_f32_10khz</a>, <a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a379ccb99013d369a41b49619083c16ef">ifftFlag</a>, <a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a4d2e31c38e8172505e0a369a6898657d">doBitReverse</a>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Process the data through the Complex Magnitude Module for</span></div>
<div class="line"><span class="comment"> calculating the magnitude at each bin */</span></div>
<div class="line"> <a name="a13"></a><a class="code" href="group__cmplx__mag.html#gae45024c497392cde2ae358a76d435213" title="Floating-point complex magnitude.">arm_cmplx_mag_f32</a>(<a class="code" href="_a_r_m_2arm__fft__bin__data_8c.html#a8a12a8ec4b866be84f4b7d3daf6a1242">testInput_f32_10khz</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__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Calculates maxValue and returns corresponding BIN value */</span></div>
<div class="line"> <a name="a14"></a><a class="code" href="group___max.html#ga5b89d1b04575aeec494f678695fb87d8" title="Maximum value of a floating-point vector.">arm_max_f32</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__fft__bin__example__f32_8c.html#a9b500899c581f6df3ffc0a9f3a9ef6aa">fftSize</a>, &maxValue, &<a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span>(<a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#a4a391651dbb95db35ccba70fc4f9e049">testIndex</a> != <a class="code" href="_a_r_m_2arm__fft__bin__example__f32_8c.html#aec50b0f697fd9e7e7e244487a4bd57e4">refIndex</a>)</div>
<div class="line"> {</div>
<div class="line"> status = <a name="a15"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</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 signals fail the PASS check.</span></div>
<div class="line"><span class="comment"> ** This denotes a test failure</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>
<div class="line"></div>
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