Peter Drescher / Mbed 2 deprecated app-board-RGB2

Example program to cycle the RGB LED on the mbed application board through all colours

Dependencies:   C12832_lcd LCD_fonts mbed

Fork of app-board-RGB by Chris Styles

Test Program to show the RGB Led on the mbed Lab Board

The color is changed by Pot 2, the value by Pot 1.

The program use a function to convert hue , saturation and value to RGB.

With this parameters you can change the color thru the rainbow. see http://en.wikipedia.org/wiki/HSL_and_HSV

main.cpp@2:52c13333401e, 2012-10-20 (annotated)

Committer:
dreschpe
Date:
Sat Oct 20 09:14:13 2012 +0000
Revision:
2:52c13333401e
Parent:
1:670665e77763
Child:
3:139f52e5e15c
change ADC scaling

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 1:670665e77763 1 /**
dreschpe 1:670665e77763 2 * Demo for the RGB Led on the mbed Lab Board
dreschpe 1:670665e77763 3 * Pot 2 changes the color
dreschpe 1:670665e77763 4 * Pot 1 changes the value
dreschpe 1:670665e77763 5 * the saturation is set to maximum
dreschpe 1:670665e77763 6 *
dreschpe 1:670665e77763 7 * Copyright (c) 2012 Peter Drescher - DC2PD
dreschpe 2:52c13333401e 8 * This Demo run only on LPC1768 !
dreschpe 2:52c13333401e 9 * The LPC11U24 has different PWM pins !
dreschpe 1:670665e77763 10 */
dreschpe 1:670665e77763 11
dreschpe 1:670665e77763 12
chris 0:f86c572491c3 13 #include "mbed.h"
dreschpe 1:670665e77763 14 #include "Small_7.h"
dreschpe 1:670665e77763 15 #include "Arial_9.h"
dreschpe 1:670665e77763 16 #include "stdio.h"
dreschpe 1:670665e77763 17 #include "C12832_lcd.h"
chris 0:f86c572491c3 18
dreschpe 1:670665e77763 19 /* the led's are connected to vcc, so a PwmOut of 100% will shut off the led and 0% will let it shine ! */
chris 0:f86c572491c3 20 PwmOut r (p23);
chris 0:f86c572491c3 21 PwmOut g (p24);
chris 0:f86c572491c3 22 PwmOut b (p25);
chris 0:f86c572491c3 23
dreschpe 1:670665e77763 24 // LCD object
dreschpe 1:670665e77763 25 C12832_LCD LCD("LCD");
dreschpe 1:670665e77763 26
dreschpe 1:670665e77763 27 AnalogIn Pot1(p19);
dreschpe 1:670665e77763 28 AnalogIn Pot2(p20);
dreschpe 1:670665e77763 29
dreschpe 1:670665e77763 30 // function to convert hue , saturation and value to RGB
dreschpe 1:670665e77763 31 // see http://en.wikipedia.org/wiki/HSL_and_HSV
dreschpe 1:670665e77763 32 void hsv2rgb(float H,float S, float V)
dreschpe 1:670665e77763 33 {
dreschpe 1:670665e77763 34 float f,h,p,q,t;
dreschpe 1:670665e77763 35 int i;
dreschpe 1:670665e77763 36 if( S == 0.0) {
dreschpe 1:670665e77763 37 r = 1.0 - V; // invert pwm !
dreschpe 1:670665e77763 38 g = 1.0 - V;
dreschpe 1:670665e77763 39 b = 1.0 - V;
dreschpe 1:670665e77763 40 return;
dreschpe 1:670665e77763 41 }
dreschpe 1:670665e77763 42 if(H > 360.0) H = 0.0; // check values
dreschpe 1:670665e77763 43 if(S > 1.0) S = 1.0;
dreschpe 1:670665e77763 44 if(S < 0.0) S = 0.0;
dreschpe 1:670665e77763 45 if(V > 1.0) V = 1.0;
dreschpe 1:670665e77763 46 if(V < 0.0) V = 0.0;
dreschpe 1:670665e77763 47 h = H / 60.0;
dreschpe 1:670665e77763 48 i = (int) h;
dreschpe 1:670665e77763 49 f = h - i;
dreschpe 1:670665e77763 50 p = V * (1.0 - S);
dreschpe 1:670665e77763 51 q = V * (1.0 - (S * f));
dreschpe 1:670665e77763 52 t = V * (1.0 - (S * (1.0 - f)));
dreschpe 1:670665e77763 53
dreschpe 1:670665e77763 54 switch(i) {
dreschpe 1:670665e77763 55 case 0:
dreschpe 1:670665e77763 56 r = 1.0 - V; // invert pwm !
dreschpe 1:670665e77763 57 g = 1.0 - t;
dreschpe 1:670665e77763 58 b = 1.0 - p;
dreschpe 1:670665e77763 59 break;
dreschpe 1:670665e77763 60 case 1:
dreschpe 1:670665e77763 61 r = 1.0 - q;
dreschpe 1:670665e77763 62 g = 1.0 - V;
dreschpe 1:670665e77763 63 b = 1.0 - p;
dreschpe 1:670665e77763 64 break;
dreschpe 1:670665e77763 65 case 2:
dreschpe 1:670665e77763 66 r = 1.0 - p;
dreschpe 1:670665e77763 67 g = 1.0 - V;
dreschpe 1:670665e77763 68 b = 1.0 - t;
dreschpe 1:670665e77763 69 break;
dreschpe 1:670665e77763 70 case 3:
dreschpe 1:670665e77763 71 r = 1.0 - p;
dreschpe 1:670665e77763 72 g = 1.0 - q;
dreschpe 1:670665e77763 73 b = 1.0 - V;
dreschpe 1:670665e77763 74 break;
dreschpe 1:670665e77763 75 case 4:
dreschpe 1:670665e77763 76 r = 1.0 - t;
dreschpe 1:670665e77763 77 g = 1.0 - p;
dreschpe 1:670665e77763 78 b = 1.0 - V;
dreschpe 1:670665e77763 79 break;
dreschpe 1:670665e77763 80 case 5:
dreschpe 1:670665e77763 81 default:
dreschpe 1:670665e77763 82 r = 1.0 - V;
dreschpe 1:670665e77763 83 g = 1.0 - p;
dreschpe 1:670665e77763 84 b = 1.0 - q;
dreschpe 1:670665e77763 85 break;
dreschpe 1:670665e77763 86 }
dreschpe 1:670665e77763 87 }
dreschpe 1:670665e77763 88
dreschpe 1:670665e77763 89
chris 0:f86c572491c3 90 int main()
chris 0:f86c572491c3 91 {
dreschpe 1:670665e77763 92 float h; // hue
dreschpe 1:670665e77763 93 float s,v; // saturation and value;
dreschpe 2:52c13333401e 94 unsigned short temp;
dreschpe 1:670665e77763 95 r.period(0.001); // set pwm period
dreschpe 1:670665e77763 96
dreschpe 1:670665e77763 97 LCD.claim(stdout); // send stdout to the LCD display
dreschpe 1:670665e77763 98 LCD.cls();
dreschpe 1:670665e77763 99 LCD.locate(10,0);
dreschpe 1:670665e77763 100 LCD.set_font((unsigned char*) Arial_9);
dreschpe 1:670665e77763 101 printf("RGB Led Demo");
dreschpe 2:52c13333401e 102 LCD.copy_to_lcd();
dreschpe 1:670665e77763 103 LCD.set_font((unsigned char*) Small_7);
dreschpe 1:670665e77763 104 s = 1.0;
dreschpe 1:670665e77763 105 for(;;){
dreschpe 1:670665e77763 106 // get Poti 1 for color
dreschpe 2:52c13333401e 107 temp = Pot1.read_u16();
dreschpe 2:52c13333401e 108 temp = temp >> 6; // truncate to 10 Bit
dreschpe 2:52c13333401e 109 h = temp * 0.3515625; // scale to 0 - 360;
dreschpe 1:670665e77763 110 LCD.locate(0,13);
dreschpe 2:52c13333401e 111 printf("Colour = %3.2f degree",h);
dreschpe 1:670665e77763 112 // get Poti 2 fo value
dreschpe 2:52c13333401e 113 temp = Pot2.read_u16();
dreschpe 2:52c13333401e 114 temp = temp >> 6;
dreschpe 2:52c13333401e 115 v = temp * 0.0009765624; // scale to 0 - 1;
dreschpe 1:670665e77763 116 LCD.locate(0,23);
dreschpe 1:670665e77763 117 printf("Val = %01.3f ",v);
dreschpe 1:670665e77763 118 LCD.copy_to_lcd();
dreschpe 1:670665e77763 119 hsv2rgb(h,s,v);
dreschpe 1:670665e77763 120 wait_ms(500);
chris 0:f86c572491c3 121 }
chris 0:f86c572491c3 122 }