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<h1>arm_signal_converge_example_f32.c</h1> </div>
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<div class="contents">
<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_signal_converge_example_f32.c </span>
<span class="comment">* </span>
<span class="comment">* Description: Example code demonstrating convergence of an adaptive </span>
<span class="comment">* filter. </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="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">** Global defines for the simulation </span>
<span class="comment">* ------------------------------------------------------------------- */</span>
<span class="preprocessor">#define TEST_LENGTH_SAMPLES 1536 </span>
<span class="preprocessor"></span><span class="preprocessor">#define NUMTAPS 32 </span>
<span class="preprocessor"></span><span class="preprocessor">#define BLOCKSIZE 32 </span>
<span class="preprocessor"></span><span class="preprocessor">#define DELTA_ERROR 0.000001f </span>
<span class="preprocessor"></span><span class="preprocessor">#define DELTA_COEFF 0.0001f </span>
<span class="preprocessor"></span><span class="preprocessor">#define MU 0.5f </span>
<span class="preprocessor"></span>
<span class="preprocessor">#define NUMFRAMES (TEST_LENGTH_SAMPLES / BLOCKSIZE) </span>
<span class="preprocessor"></span>
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Declare FIR state buffers and structure </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__signal__converge__example__f32_8c.html#a358ec4e79689e6d3787b89fe78bdb772">firStateF32</a>[<a name="a1"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a> + <a name="a2"></a><a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>];
<a name="_a3"></a><a class="code" href="structarm__fir__instance__f32.html" title="Instance structure for the floating-point FIR filter.">arm_fir_instance_f32</a> <a name="a4"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a652d3507a776117b4860b3e18f2d2d64">LPF_instance</a>;
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Declare LMSNorm state buffers and structure </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="a5"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a706980f6f654d199c61e08e7814bd0a1">lmsStateF32</a>[<a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a> + <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>];
<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__signal__converge__example__f32_8c.html#a276e8a27484cf9389dabf047e76992ed">errOutput</a>[<a name="a7"></a><a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];
<a name="_a8"></a><a class="code" href="structarm__lms__norm__instance__f32.html" title="Instance structure for the floating-point normalized LMS filter.">arm_lms_norm_instance_f32</a> <a name="a9"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a519f9b4db839245f3bf2075ff4c17605">lmsNorm_instance</a>;
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Function Declarations for Signal Convergence Example </span>
<span class="comment">* ------------------------------------------------------------------- */</span>
<a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a name="a10"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#ac786d43cbc17bb09738447034ff8e22e">test_signal_converge_example</a>( <span class="keywordtype">void</span> );
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Internal functions </span>
<span class="comment">* ------------------------------------------------------------------- */</span>
<a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6" title="Error status returned by some functions in the library.">arm_status</a> <a name="a11"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a8f521e839d4fad24a4f12a18dfeae5d4">test_signal_converge</a>(<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>* <a name="a12"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>,
uint32_t <a name="a13"></a><a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
<span class="keywordtype">void</span> <a name="a14"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#afd2975c4763ec935771e6f63bfe7758b">getinput</a>(<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a>* input,
uint32_t fr_cnt,
uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>);
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* External Declarations for FIR F32 module Test </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="a15"></a><a class="code" href="arm__graphic__equalizer__example__q31_8c.html#aa4699dc6ee05353c83e0be4e69f6ad05">testInput_f32</a>[<a class="code" href="arm__class__marks__example__f32_8c.html#abc004a7fade488e72310fd96c0a101dc">TEST_LENGTH_SAMPLES</a>];
<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="a16"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#aad7c60c30c5af397bb75e603f250f9d3">lmsNormCoeff_f32</a>[32];
<span class="keyword">extern</span> <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 name="a17"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#aede8780f021b7f5c33df0c5ee2183ee6">FIRCoeff_f32</a>[32];
<span class="keyword">extern</span> <a class="code" href="structarm__lms__norm__instance__f32.html" title="Instance structure for the floating-point normalized LMS filter.">arm_lms_norm_instance_f32</a> <a class="code" href="arm__signal__converge__example__f32_8c.html#a519f9b4db839245f3bf2075ff4c17605">lmsNorm_instance</a>;
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Declare I/O buffers </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="a18"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>[<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>];
<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a19"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>[<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>];
<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> <a name="a20"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>[<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</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__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>[<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>];
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment">* Signal converge test </span>
<span class="comment">* ------------------------------------------------------------------- */</span>
int32_t <a name="a21"></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="a22"></a><a class="code" href="arm__dotproduct__example__f32_8c.html#a88ccb294236ab22b00310c47164c53c3">status</a>;
uint32_t index;
<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> minValue;
<span class="comment">/* Initialize the LMSNorm data structure */</span>
<a name="a23"></a><a class="code" href="group___l_m_s___n_o_r_m.html#gac7ccbaea863882056eee815456464670" title="Initialization function for floating-point normalized LMS filter.">arm_lms_norm_init_f32</a>(&amp;lmsNorm_instance, <a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a>, lmsNormCoeff_f32, <a class="code" href="arm__signal__converge__example__f32_8c.html#a706980f6f654d199c61e08e7814bd0a1">lmsStateF32</a>, <a name="a24"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a09bc9e6a44f0291cfcf578f2efcddfab">MU</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>);
<span class="comment">/* Initialize the FIR data structure */</span>
<a name="a25"></a><a class="code" href="group___f_i_r.html#ga98d13def6427e29522829f945d0967db" title="Initialization function for the floating-point FIR filter.">arm_fir_init_f32</a>(&amp;LPF_instance, <a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a>, (<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *)FIRCoeff_f32, <a class="code" href="arm__signal__converge__example__f32_8c.html#a358ec4e79689e6d3787b89fe78bdb772">firStateF32</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>);
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment"> * Loop over the frames of data and execute each of the processing </span>
<span class="comment"> * functions in the system. </span>
<span class="comment"> * ------------------------------------------------------------------- */</span>
<span class="keywordflow">for</span>(i=0; i &lt; <a name="a26"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a4b6b859e1e3f6021a360390be287ca2c">NUMFRAMES</a>; i++)
{
<span class="comment">/* Read the input data - uniformly distributed random noise - into wire1 */</span>
<a name="a27"></a><a class="code" href="group__copy.html#gadd1f737e677e0e6ca31767c7001417b3" title="Copies the elements of a floating-point vector.">arm_copy_f32</a>(<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#aa4699dc6ee05353c83e0be4e69f6ad05">testInput_f32</a> + (i * <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>), <a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>, BLOCKSIZE);
<span class="comment">/* Execute the FIR processing function. Input wire1 and output wire2 */</span>
<a name="a28"></a><a class="code" href="group___f_i_r.html#gae8fb334ea67eb6ecbd31824ddc14cd6a" title="Processing function for the floating-point FIR filter.">arm_fir_f32</a>(&amp;LPF_instance, <a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>);
<span class="comment">/* Execute the LMS Norm processing function*/</span>
<a name="a29"></a><a class="code" href="group___l_m_s___n_o_r_m.html#ga2418c929087c6eba719758eaae3f3300" title="Processing function for floating-point normalized LMS filter.">arm_lms_norm_f32</a>(&amp;lmsNorm_instance, <span class="comment">/* LMSNorm instance */</span>
<a class="code" href="arm__signal__converge__example__f32_8c.html#a16e759789fbc05f878863f009066c8ea">wire1</a>, <span class="comment">/* Input signal */</span>
<a class="code" href="arm__signal__converge__example__f32_8c.html#a4e370163c81ae2b72cc655a6b79e4c6a">wire2</a>, <span class="comment">/* Reference Signal */</span>
<a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, <span class="comment">/* Converged Signal */</span>
<a class="code" href="arm__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>, <span class="comment">/* Error Signal, this will become small as the signal converges */</span>
<a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>); <span class="comment">/* BlockSize */</span>
<span class="comment">/* apply overall gain */</span>
<a name="a30"></a><a class="code" href="group__scale.html#ga3487af88b112f682ee90589cd419e123" title="Multiplies a floating-point vector by a scalar.">arm_scale_f32</a>(<a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, 5, <a class="code" href="arm__signal__converge__example__f32_8c.html#a7e2cceadf6ec7f0aa0f698a680fa3a4b">wire3</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>); <span class="comment">/* in-place buffer */</span>
}
status = <a name="a31"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a9f8b2a10bd827fb4600e77d455902eb0">ARM_MATH_SUCCESS</a>;
<span class="comment">/* ------------------------------------------------------------------------------- </span>
<span class="comment"> * Test whether the error signal has reached towards 0. </span>
<span class="comment"> * ----------------------------------------------------------------------------- */</span>
<a name="a32"></a><a class="code" href="group___basic_abs.html#ga421b6275f9d35f50286c0ff3beceff02" title="Floating-point vector absolute value.">arm_abs_f32</a>(<a class="code" href="arm__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>, <a class="code" href="arm__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>);
<a name="a33"></a><a class="code" href="group___min.html#gaf62b1673740fc516ea64daf777b7d74a" title="Minimum value of a floating-point vector.">arm_min_f32</a>(<a class="code" href="arm__signal__converge__example__f32_8c.html#ae6bcc00ea126543ab33d6174549eacda">err_signal</a>, <a class="code" href="arm__graphic__equalizer__example__q31_8c.html#afcf795f5a96fd55561abe69f56224630">BLOCKSIZE</a>, &amp;minValue, &amp;index);
<span class="keywordflow">if</span> (minValue &gt; <a name="a34"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a6d3c6a4484dcaac72fbfe5100c39b9b6">DELTA_ERROR</a>)
{
status = <a name="a35"></a><a class="code" href="arm__math_8h.html#a5e459c6409dfcd2927bb8a57491d7cf6a09457f2be656b35015fd6d36202fa376">ARM_MATH_TEST_FAILURE</a>;
}
<span class="comment">/* ---------------------------------------------------------------------- </span>
<span class="comment"> * Test whether the filter coefficients have converged. </span>
<span class="comment"> * ------------------------------------------------------------------- */</span>
<a name="a36"></a><a class="code" href="group___basic_sub.html#ga7f975a472de286331134227c08aad826" title="Floating-point vector subtraction.">arm_sub_f32</a>((<a class="code" href="arm__math_8h.html#a4611b605e45ab401f02cab15c5e38715" title="32-bit floating-point type definition.">float32_t</a> *)FIRCoeff_f32, lmsNormCoeff_f32, lmsNormCoeff_f32, <a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a>);
<a class="code" href="group___basic_abs.html#ga421b6275f9d35f50286c0ff3beceff02" title="Floating-point vector absolute value.">arm_abs_f32</a>(lmsNormCoeff_f32, lmsNormCoeff_f32, <a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a>);
<a class="code" href="group___min.html#gaf62b1673740fc516ea64daf777b7d74a" title="Minimum value of a floating-point vector.">arm_min_f32</a>(lmsNormCoeff_f32, <a class="code" href="arm__signal__converge__example__f32_8c.html#ac1d8ddb4f9a957eef3ad13d44de4d804">NUMTAPS</a>, &amp;minValue, &amp;index);
<span class="keywordflow">if</span> (minValue &gt; <a name="a37"></a><a class="code" href="arm__signal__converge__example__f32_8c.html#a9156349d99957ded15d8aa3aa11723de">DELTA_COEFF</a>)
{
status = <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 did not pass the convergence 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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