1 | #include "p24fj64ga002.h" // CPU: PIC24FJ64GA002
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2 |
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3 | #define PWM_PERIOD_MAX 1024 // 10Bit Auflösung
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4 |
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5 | /****************************************************************************/
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6 | /* * * * * * * * * * * * * * FUNKTIONEN * * * * * * * * * * * * * */
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7 | /****************************************************************************/
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8 | //----------------------------------------------------------------------------
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9 | // Funktionsnamen : init_system()
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10 | //
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11 | // Beschreibung : CPU Register init
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12 | // Arguments : ---
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13 | // Return : ---
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14 | //----------------------------------------------------------------------------
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15 | void init_system(void)
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16 | {
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17 |
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18 | // PWM Output Capture Setup -----------------------------------------------------
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19 |
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20 | OC1CON = 0x0000; // Turn off Output Compare 1 Module
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21 | OC1R = 0; // init at 0% PWM
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22 | OC1RS = 0; // init at 0% PWM
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23 | OC1CON = 0x000E; // activate the PWM Module
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24 |
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25 | OC2CON = 0x0000; // Turn off Output Compare 1 Module
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26 | OC2R = 0; // init at 0% PWM
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27 | OC2RS = 0; // init at 0% PWM
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28 | OC2CON = 0x000E; // activate the PWM Module
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29 |
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30 | OC3CON = 0x0000; // Turn off Output Compare 1 Module
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31 | OC3R = 0; // init at 0% PWM
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32 | OC3RS = 0X; // init at 0% PWM
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33 | OC3CON = 0x000E; // activate the PWM Module
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34 |
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35 | OC4CON = 0x0000; // Turn off Output Compare 1 Module
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36 | OC4R = 0; // init at 0% PWM
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37 | OC4RS = 0; // init at 0% PWM
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38 | OC4CON = 0x000E; // activate the PWM Module
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39 |
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40 | // Timer3 Setup --------------------------------------------------------------
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41 | // Timer für RGB PWM Signale
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42 |
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43 | T3CON = 0x0000; // Stops the Timer3 and reset control reg.
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44 | PR3 = PWM_PERIOD-1; // PWM Periode 1kHz > PR3= (PWM_Periode/TCY)-1 = (0,001s/62,5ns)-1
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45 | _T3IP = 0x01;
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46 | _T3IF = 0; // Interrupt Flag löschen
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47 | _T3IE = 1; // Timer 3 Interrupt freigeben
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48 | T3CON = 0x8010; // (1,95kHz) Timer 3 freigeben, prescaler 1:8 internal clock
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49 | }
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50 |
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51 | //----------------------------------------------------------------------------
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52 | // Funktionsnamen : hsv_to_rgb
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53 | //
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54 | // Beschreibung : HSV nach RGB konvertieren
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55 | // Arguments : ---
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56 | // Return : ---
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57 | //----------------------------------------------------------------------------
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58 | void hsv_to_rgb (float hue,float saturation,float value)
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59 | {
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60 | float H,S,V;
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61 | float r,g,b;
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62 | unsigned short i;
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63 | float f,p,q,t;
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64 |
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65 | H=hue; // Bereich 0-360°
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66 | S= saturation/100; // 100% = 1
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67 | V= value/100; // 100% = 1
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68 |
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69 | if(S == 0)
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70 | {
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71 | //r,g,b = V;
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72 | Red=PWM_PERIOD_MAX, Green=PWM_PERIOD_MAX, Blue=PWM_PERIOD_MAX4; // Weiss
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73 | }
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74 | else
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75 | {
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76 | H /= 60; // sector 0 to 5
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77 | i = floor(H);
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78 | f = H - i;
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79 | p = V * (1 - S);
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80 | q = V * (1 - S * f);
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81 | t = V * (1 - S * (1 - f));
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82 |
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83 | switch(i)
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84 | {
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85 | case 0:
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86 | r = V; g = t; b = p;
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87 | break;
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88 |
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89 | case 1:
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90 | r = q; g = V; b = p;
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91 | break;
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92 |
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93 | case 2:
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94 | r = p; g = V; b = t;
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95 | break;
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96 |
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97 | case 3:
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98 | r = p; g = q; b = V;
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99 | break;
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100 |
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101 | case 4:
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102 | r = t; g = p; b = V;
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103 | break;
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104 |
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105 | default:
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106 | r = V; g = p; b = q;
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107 | break; // case 5:
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108 | }
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109 |
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110 | // In RGB Integer konvertieren
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111 |
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112 | Red=r*PWM_PERIOD_MAX;
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113 | Green=g*PWM_PERIOD_MAX;
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114 | Blue=b*PWM_PERIOD_MAX;
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115 |
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116 | }
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117 |
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118 | // OCxRS Register wird in Timer3 IRQ in OCxR Register kopiert
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119 | OC1RS = Red; // PWM Werte invertieren und ausgeben
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120 | OC2RS = Green; // PWM Werte invertieren und ausgeben
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121 | OC3RS = Blue; // PWM Werte invertieren und ausgeben
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122 |
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123 | if(W_LED_ENABLED) OC4RS = 0; // Weisse LED einschalten
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124 | if(W_LED_DISABLED) OC4RS = PWM_PERIOD; // Weisse LED ausschalten
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125 | }
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126 |
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127 |
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128 | /****************************************************************************/
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129 | /* * * * * * * * * * * * * HAUPTPROGRAMM * * * * * * * * * * * */
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130 | /****************************************************************************/
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131 | int main(void)
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132 | {
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133 | volatile unsigned short H,S,V;
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134 |
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135 | init_system();
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136 |
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137 | H=0;
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138 | S=100;
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139 | V=100;
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140 |
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141 | W_LED_OFF; // Weisse LED ausschalten
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142 |
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143 | while(1) // endless
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144 | {
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145 |
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146 | if(H < 360) H++; // 0-360° Farbwechsel jede Millisekunde
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147 | else H=0;
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148 |
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149 | hsv_to_rgb(H,S,V); // HSV Werte in RGB konvertieren und ausgeben
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150 |
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151 | __delay_ms(100); // 100ms warten
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152 |
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153 | }
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154 | }
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155 |
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156 | // END ----------------------
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