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annotate src/Tests/compass_test.cpp @ 297:65f6a7bfc205

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German tGasUsage
author heinrichsweikamp
date Sun, 31 May 2015 10:42:47 +0200
parents cd2320cd6f9a
children
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1 //////////////////////////////////////////////////////////////////////////////
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2 /// compass_test.cpp
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3 /// Unit test for compass calibration.
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4 /// Copyright (c) 2012-2015, JD Gascuel, HeinrichsWeikamp, all right reserved.
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5 //////////////////////////////////////////////////////////////////////////////
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6 // HISTORY
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7 // 2015-05-23 jDG: Rewrite compass testing, to allow reducing code size.
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8
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9 extern "C" {
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10 # include "compass.h"
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11 }
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12
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13 #include <gtest/gtest.h>
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14
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15 #include <math.h>
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16 #include <iostream>
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17
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18 //////////////////////////////////////////////////////////////////////////////
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19
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20 inline float uniform() {
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21 return (rand() & 0xFFFF) / 65536.0f;
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22 }
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23 inline float sqr(float x) {
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24 return x*x;
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25 }
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26
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27 static float radius = 0.21f;
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28 static float cx = 0, cy = 0, cz = 0;
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29
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30 //////////////////////////////////////////////////////////////////////////////
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31
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32 static void check_calib()
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33 {
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34 compass_reset_calibration();
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35
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36 //---- Generates random points on a sphere -------------------------------
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37 // of radius,center (cx, cy, cz):
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38 for(int i=0; i<100; ++i)
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39 {
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40 float theta = uniform()*360.0f;
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41 float phi = uniform()*180.0f - 90.0f;
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42
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43 float x = cx + radius * cosf(phi)*cosf(theta);
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44 float y = cy + radius * cosf(phi)*sinf(theta);
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45 float z = cz + radius * sinf(phi);
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46
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47 compass_DX_f = short(32768 * x);
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48 compass_DY_f = short(32768 * y);
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49 compass_DZ_f = short(32768 * z);
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50 compass_add_calibration();
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51 }
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52
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53 compass_solve_calibration();
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54 float r2 = sqr(compass_CX_f/32768.0f - cx)
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55 + sqr(compass_CY_f/32768.0f - cy)
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56 + sqr(compass_CZ_f/32768.0f - cz);
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57
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58 // Calibration error less than 2 bits:
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59 EXPECT_NEAR(0, sqrtf(r2), 4.0f/32768.0f)
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60 << "Center at (" << compass_CX_f/32768.0f << ", "
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61 << compass_CY_f/32768.0f << ", "
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62 << compass_CZ_f/32768.0f << ")."
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63 << " Error = " << sqrtf(r2);
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64 }
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65
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66 //////////////////////////////////////////////////////////////////////////////
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67
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68 TEST(compass, calibration_centered)
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69 {
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70 compass_CX_f = compass_CY_f = compass_CZ_f = 0;
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71
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72 // Half-unit, centered, sphere:
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73 radius = 0.5f;
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74
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75 // Try 10 recalibration passes:
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76 for(int p=0; p<10; ++p)
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77 check_calib();
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78 }
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79
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80 //////////////////////////////////////////////////////////////////////////////
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81
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82 TEST(compass, calibration_near_centered)
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83 {
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84 // Put magnetic center elsewhere, but keep position+radius < 1.0, to
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85 // avoid Q15 overflow...
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86 radius = 0.21f;
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87 cx = 0.019f, cy = -0.026f, cz = 0.004f;
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88
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89 // Try 10 recalibration passes:
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90 for(int p=0; p<10; ++p)
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91 check_calib();
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92 }
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93
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94 //////////////////////////////////////////////////////////////////////////////
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95
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96 TEST(compass, calibration_far_centered)
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97 {
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98 // Put magnetic center elsewhere, but keep position+radius < 1.0, to
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99 // avoid Q15 overflow...
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100 radius = 0.21f;
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101 cx = -0.79f, cy = 0.79f, cz = 0.79f;
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102
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103 // Try 10 recalibration passes:
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104 for(int p=0; p<10; ++p)
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105 check_calib();
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106 }
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107
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108 //////////////////////////////////////////////////////////////////////////////
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109
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110 TEST(compass, calibration_small_centered_signal)
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111 {
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112 // use a very very small magnetic signal, centered:
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113 radius = 0.001f;
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114 cx = 0.000f, cy = 0.000f, cz = 0.000f;
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115
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116 // Try 10 recalibration passes:
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117 for(int p=0; p<10; ++p)
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118 check_calib();
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119 }
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120
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121 //////////////////////////////////////////////////////////////////////////////
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122
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123 TEST(compass, calibration_small_off_centered_signal)
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124 {
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125 // Have a rather small sphere radius (20%), off-centered buy 80%
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126 radius = 0.200f;
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127 cx = 0.800f, cy = -0.800f, cz = 0.800f;
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128
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129 // Try 10 recalibration passes:
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130 for(int p=0; p<10; ++p)
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131 check_calib();
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132 }