CMSIS DSP Software Library: arm_linear_interp_example_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_linear_interp_example_f32.c Go to the documentation of this file.00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_linear_interp_example_f32.c 00009 * 00010 * Description: Example code demonstrating usage of sin function 00011 * and uses linear interpolation to get higher precision 00012 * 00013 * Target Processor: Cortex-M4/Cortex-M3 00014 * 00015 * 00016 * Version 1.0.3 2010/11/29 00017 * Re-organized the CMSIS folders and updated documentation. 00018 * 00019 * Version 1.0.1 2010/10/05 KK 00020 * Production release and review comments incorporated. 00021 * 00022 * Version 1.0.0 2010/09/20 KK 00023 * Production release and review comments incorporated. 00024 * ------------------------------------------------------------------- */ 00025 00070 #include "arm_math.h" 00071 #include "math_helper.h" 00072 00073 #define SNR_THRESHOLD 90 00074 #define TEST_LENGTH_SAMPLES 10 00075 #define XSPACING (0.00005f) 00076 00077 /* ---------------------------------------------------------------------- 00078 * Test input data for F32 SIN function 00079 * Generated by the MATLAB rand() function 00080 * randn('state', 0) 00081 * xi = (((1/4.18318581819710)* randn(blockSize, 1) * 2* pi)); 00082 * --------------------------------------------------------------------*/ 00083 float32_t testInputSin_f32[TEST_LENGTH_SAMPLES] = 00084 { 00085 -0.649716504673081170, -2.501723745497831200, 0.188250329003310100, 0.432092748487532540, -1.722010988459680800, 1.788766476323060600, 1.786136060975809500, -0.056525543169408797, 00086 0.491596272728153760, 0.262309671126153390 00087 }; 00088 00089 /*------------------------------------------------------------------------------ 00090 * Reference out of SIN F32 function for Block Size = 10 00091 * Calculated from sin(testInputSin_f32) 00092 *------------------------------------------------------------------------------*/ 00093 float32_t testRefSinOutput32_f32[TEST_LENGTH_SAMPLES] = 00094 { 00095 -0.604960695383043530, -0.597090287967934840, 0.187140422442966500, 0.418772124875992690, -0.988588831792106880, 0.976338412038794010, 0.976903856413481100, -0.056495446835214236, 00096 0.472033731854734240, 0.259311907228582830 00097 }; 00098 00099 /*------------------------------------------------------------------------------ 00100 * Method 1: Test out Buffer Calculated from Cubic Interpolation 00101 *------------------------------------------------------------------------------*/ 00102 float32_t testOutput[TEST_LENGTH_SAMPLES]; 00103 00104 /*------------------------------------------------------------------------------ 00105 * Method 2: Test out buffer Calculated from Linear Interpolation 00106 *------------------------------------------------------------------------------*/ 00107 float32_t testLinIntOutput[TEST_LENGTH_SAMPLES]; 00108 00109 /*------------------------------------------------------------------------------ 00110 * External table used for linear interpolation 00111 *------------------------------------------------------------------------------*/ 00112 extern float32_t arm_linear_interep_table[188495]; 00113 00114 /* ---------------------------------------------------------------------- 00115 * Global Variables for caluclating SNR's for Method1 & Method 2 00116 * ------------------------------------------------------------------- */ 00117 float32_t snr1; 00118 float32_t snr2; 00119 00120 /* ---------------------------------------------------------------------------- 00121 * Calculation of Sine values from Cubic Interpolation and Linear interpolation 00122 * ---------------------------------------------------------------------------- */ 00123 int32_t main(void) 00124 { 00125 uint32_t i; 00126 arm_status status; 00127 00128 arm_linear_interp_instance_f32 S = {188495, -3.141592653589793238, XSPACING, &arm_linear_interep_table[0]}; 00129 00130 /*------------------------------------------------------------------------------ 00131 * Method 1: Test out Calculated from Cubic Interpolation 00132 *------------------------------------------------------------------------------*/ 00133 for(i=0; i< TEST_LENGTH_SAMPLES; i++) 00134 { 00135 testOutput[i] = arm_sin_f32(testInputSin_f32[i]); 00136 } 00137 00138 /*------------------------------------------------------------------------------ 00139 * Method 2: Test out Calculated from Cubic Interpolation and Linear interpolation 00140 *------------------------------------------------------------------------------*/ 00141 00142 for(i=0; i< TEST_LENGTH_SAMPLES; i++) 00143 { 00144 testLinIntOutput[i] = arm_linear_interp_f32(&S, testInputSin_f32[i]); 00145 } 00146 00147 /*------------------------------------------------------------------------------ 00148 * SNR calculation for method 1 00149 *------------------------------------------------------------------------------*/ 00150 snr1 = arm_snr_f32(testRefSinOutput32_f32, testOutput, 2); 00151 00152 /*------------------------------------------------------------------------------ 00153 * SNR calculation for method 2 00154 *------------------------------------------------------------------------------*/ 00155 snr2 = arm_snr_f32(testRefSinOutput32_f32, testLinIntOutput, 2); 00156 00157 /*------------------------------------------------------------------------------ 00158 * Initialise status depending on SNR calculations 00159 *------------------------------------------------------------------------------*/ 00160 if( snr2 > snr1) 00161 { 00162 status = ARM_MATH_SUCCESS; 00163 } 00164 else 00165 { 00166 status = ARM_MATH_TEST_FAILURE; 00167 } 00168 00169 /* ---------------------------------------------------------------------- 00170 ** Loop here if the signals fail the PASS check. 00171 ** This denotes a test failure 00172 ** ------------------------------------------------------------------- */ 00173 if( status != ARM_MATH_SUCCESS) 00174 { 00175 while(1); 00176 } 00177 } 00178  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:56 for CMSIS DSP Software Library by  1.7.2