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<h1>arm_linear_interp_example_f32.c</h1> </div>
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<div class="fragment"><pre class="fragment"><span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Copyright (C) 2010 ARM Limited. All rights reserved. </span>
<span class="comment">* </span>
<span class="comment">* $Date: 29. November 2010 </span>
<span class="comment">* $Revision: V1.0.3 </span>
<span class="comment">* </span>
<span class="comment">* Project: CMSIS DSP Library </span>
<span class="comment">* Title: arm_linear_interp_example_f32.c </span>
<span class="comment">* </span>
<span class="comment">* Description: Example code demonstrating usage of sin function </span>
<span class="comment">* and uses linear interpolation to get higher precision </span>
<span class="comment">* </span>
<span class="comment">* Target Processor: Cortex-M4/Cortex-M3 </span>
<span class="comment">*</span>
<span class="comment">*</span>
<span class="comment">* Version 1.0.3 2010/11/29 </span>
<span class="comment">* Re-organized the CMSIS folders and updated documentation. </span>
<span class="comment">* </span>
<span class="comment">* Version 1.0.1 2010/10/05 KK </span>
<span class="comment">* Production release and review comments incorporated. </span>
<span class="comment">*</span>
<span class="comment">* Version 1.0.0 2010/09/20 KK</span>
<span class="comment">* Production release and review comments incorporated.</span>
<span class="comment">* ------------------------------------------------------------------- */</span>
<span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
<span class="preprocessor">#include &quot;math_helper.h&quot;</span>
<span class="preprocessor">#define SNR_THRESHOLD 90 </span>
<span class="preprocessor"></span><span class="preprocessor">#define TEST_LENGTH_SAMPLES 10 </span>
<span class="preprocessor"></span><span class="preprocessor">#define XSPACING (0.00005f)</span>
<span class="preprocessor"></span>
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Test input data for F32 SIN function </span>
<span class="comment">* Generated by the MATLAB rand() function </span>
<span class="comment">* randn(&#39;state&#39;, 0)</span>
<span class="comment">* xi = (((1/4.18318581819710)* randn(blockSize, 1) * 2* pi));</span>
<span class="comment">* --------------------------------------------------------------------*/</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__linear__interp__example__f32_8c.html#a4be0c4d25e63ce04b8cc8ad070805287">testInputSin_f32</a>[<a name="a1"></a><a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>] =
{
-0.649716504673081170, -2.501723745497831200, 0.188250329003310100, 0.432092748487532540, -1.722010988459680800, 1.788766476323060600, 1.786136060975809500, -0.056525543169408797,
0.491596272728153760, 0.262309671126153390
};
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment">* Reference out of SIN F32 function for Block Size = 10 </span>
<span class="comment">* Calculated from sin(testInputSin_f32) </span>
<span class="comment">*------------------------------------------------------------------------------*/</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__linear__interp__example__f32_8c.html#a5a33218d422603f3e5267b6984bdddd1">testRefSinOutput32_f32</a>[<a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>] =
{
-0.604960695383043530, -0.597090287967934840, 0.187140422442966500, 0.418772124875992690, -0.988588831792106880, 0.976338412038794010, 0.976903856413481100, -0.056495446835214236,
0.472033731854734240, 0.259311907228582830
};
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment">* Method 1: Test out Buffer Calculated from Cubic Interpolation </span>
<span class="comment">*------------------------------------------------------------------------------*/</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="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[<a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment">* Method 2: Test out buffer Calculated from Linear Interpolation </span>
<span class="comment">*------------------------------------------------------------------------------*/</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__linear__interp__example__f32_8c.html#a8ca7d0ad6e04efed464bcaacedacf925">testLinIntOutput</a>[<a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment">* External table used for linear interpolation </span>
<span class="comment">*------------------------------------------------------------------------------*/</span>
<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="a5"></a><a class="code" href="arm__linear__interp__example__f32_8c.html#a04ff02547b481a95c28064b89f5d6763">arm_linear_interep_table</a>[188495];
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Global Variables for caluclating SNR&#39;s for Method1 &amp; Method 2 </span>
<span class="comment">* ------------------------------------------------------------------- */</span>
<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a6"></a><a class="code" href="arm__linear__interp__example__f32_8c.html#ad492c21cf2dd4e9199ae46c77f812cbc">snr1</a>;
<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__linear__interp__example__f32_8c.html#a269948ab25f230d33e3f22eab85aa1cf">snr2</a>;
<span class="comment">/* ---------------------------------------------------------------------------- </span>
<span class="comment">* Calculation of Sine values from Cubic Interpolation and Linear interpolation </span>
<span class="comment">* ---------------------------------------------------------------------------- */</span>
int32_t <a name="a8"></a><a class="code" href="arm__class__marks__example__f32_8c.html#a196718f834091385d38586a0ce4009dc">main</a>(<span class="keywordtype">void</span>)
{
uint32_t i;
<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="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;
<a name="_a10"></a><a class="code" href="structarm__linear__interp__instance__f32.html" title="Instance structure for the floating-point Linear Interpolate function.">arm_linear_interp_instance_f32</a> S = {188495, -3.141592653589793238, <a name="a11"></a><a class="code" href="arm__linear__interp__example__f32_8c.html#a0ecae49cebd837aac53411c8f877503d">XSPACING</a>, &amp;<a class="code" href="arm__linear__interp__example__f32_8c.html#a04ff02547b481a95c28064b89f5d6763">arm_linear_interep_table</a>[0]};
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment"> * Method 1: Test out Calculated from Cubic Interpolation </span>
<span class="comment"> *------------------------------------------------------------------------------*/</span>
<span class="keywordflow">for</span>(i=0; i&lt; <a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>; i++)
{
<a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>[i] = <a name="a12"></a><a class="code" href="group__sin.html#gae164899c4a3fc0e946dc5d55555fe541" title="Fast approximation to the trigonometric sine function for floating-point data.">arm_sin_f32</a>(<a class="code" href="arm__linear__interp__example__f32_8c.html#a4be0c4d25e63ce04b8cc8ad070805287">testInputSin_f32</a>[i]);
}
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment"> * Method 2: Test out Calculated from Cubic Interpolation and Linear interpolation </span>
<span class="comment"> *------------------------------------------------------------------------------*/</span>
<span class="keywordflow">for</span>(i=0; i&lt; <a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>; i++)
{
<a class="code" href="arm__linear__interp__example__f32_8c.html#a8ca7d0ad6e04efed464bcaacedacf925">testLinIntOutput</a>[i] = <a name="a13"></a><a class="code" href="group___linear_interpolate.html#ga2269263d810cafcd19681957b37d5cf6" title="Process function for the floating-point Linear Interpolation Function.">arm_linear_interp_f32</a>(&amp;S, <a class="code" href="arm__linear__interp__example__f32_8c.html#a4be0c4d25e63ce04b8cc8ad070805287">testInputSin_f32</a>[i]);
}
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment"> * SNR calculation for method 1 </span>
<span class="comment"> *------------------------------------------------------------------------------*/</span>
<a class="code" href="arm__linear__interp__example__f32_8c.html#ad492c21cf2dd4e9199ae46c77f812cbc">snr1</a> = arm_snr_f32(<a class="code" href="arm__linear__interp__example__f32_8c.html#a5a33218d422603f3e5267b6984bdddd1">testRefSinOutput32_f32</a>, <a class="code" href="arm__class__marks__example__f32_8c.html#afd4d61aad5f35a4e42d580004e2f9a1d">testOutput</a>, 2);
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment"> * SNR calculation for method 2 </span>
<span class="comment"> *------------------------------------------------------------------------------*/</span>
<a class="code" href="arm__linear__interp__example__f32_8c.html#a269948ab25f230d33e3f22eab85aa1cf">snr2</a> = arm_snr_f32(<a class="code" href="arm__linear__interp__example__f32_8c.html#a5a33218d422603f3e5267b6984bdddd1">testRefSinOutput32_f32</a>, <a class="code" href="arm__linear__interp__example__f32_8c.html#a8ca7d0ad6e04efed464bcaacedacf925">testLinIntOutput</a>, 2);
<span class="comment">/*------------------------------------------------------------------------------ </span>
<span class="comment"> * Initialise status depending on SNR calculations </span>
<span class="comment"> *------------------------------------------------------------------------------*/</span>
<span class="keywordflow">if</span>( <a class="code" href="arm__linear__interp__example__f32_8c.html#a269948ab25f230d33e3f22eab85aa1cf">snr2</a> &gt; <a class="code" href="arm__linear__interp__example__f32_8c.html#ad492c21cf2dd4e9199ae46c77f812cbc">snr1</a>)
{
status = <a name="a14"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;
}
<span class="keywordflow">else</span>
{
status = <a name="a15"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;
}
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment"> ** Loop here if the signals fail the PASS check. </span>
<span class="comment"> ** This denotes a test failure </span>
<span class="comment"> ** ------------------------------------------------------------------- */</span>
<span class="keywordflow">if</span>( status != <a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>)
{
<span class="keywordflow">while</span>(1);
}
}
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