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

Diff: main.cpp

Revision:

1:670665e77763

Parent:

0:f86c572491c3

Child:

2:52c13333401e

--- a/main.cpp	Mon Oct 15 12:19:12 2012 +0000
+++ b/main.cpp	Sat Oct 20 00:21:54 2012 +0000
@@ -1,19 +1,119 @@
+/**
+  * Demo for the RGB Led on the mbed Lab Board
+  * Pot 2 changes the color 
+  * Pot 1 changes the value
+  * the saturation is set to maximum
+  * 
+  * Copyright (c) 2012 Peter Drescher - DC2PD
+  */   
+
+
 #include "mbed.h"
+#include "Small_7.h"
+#include "Arial_9.h"
+#include "stdio.h"
+#include "C12832_lcd.h"
 
+/* the led's are connected to vcc, so a PwmOut of 100% will shut off the led and 0% will let it shine ! */
 PwmOut r (p23);
 PwmOut g (p24);
 PwmOut b (p25);
 
+// LCD object
+C12832_LCD LCD("LCD");
+
+AnalogIn Pot1(p19);
+AnalogIn Pot2(p20);
+
+// function to convert hue , saturation and  value to RGB
+// see http://en.wikipedia.org/wiki/HSL_and_HSV
+void hsv2rgb(float H,float S, float V)
+{
+    float f,h,p,q,t;
+    int i;
+    if( S == 0.0) {
+        r = 1.0 - V;  // invert pwm !
+        g = 1.0 - V;
+        b = 1.0 - V;
+        return;
+    }
+    if(H > 360.0) H = 0.0;   // check values
+    if(S > 1.0) S = 1.0; 
+    if(S < 0.0) S = 0.0;
+    if(V > 1.0) V = 1.0;
+    if(V < 0.0) V = 0.0;
+    h = H / 60.0;
+    i = (int) h;
+    f = h - i;
+    p = V * (1.0 - S);
+    q = V * (1.0 - (S * f));
+    t = V * (1.0 - (S * (1.0 - f)));
+
+    switch(i) {
+        case 0:
+            r = 1.0 - V;  // invert pwm !
+            g = 1.0 - t;
+            b = 1.0 - p;
+            break;
+        case 1:
+            r = 1.0 - q;
+            g = 1.0 - V;
+            b = 1.0 - p;
+            break;
+        case 2:
+            r = 1.0 - p;
+            g = 1.0 - V;
+            b = 1.0 - t;
+            break;
+        case 3:
+            r = 1.0 - p;
+            g = 1.0 - q;
+            b = 1.0 - V;
+            break;
+        case 4:
+            r = 1.0 - t;
+            g = 1.0 - p;
+            b = 1.0 - V;
+            break;
+        case 5:
+        default:
+            r = 1.0 - V;
+            g = 1.0 - p;
+            b = 1.0 - q;
+            break;
+    }
+}
+
+    
 int main()
 {
-    r.period(0.001);
-    while(1) {
-        for(float i = 0.0; i < 1.0 ; i += 0.001) {
-            float p = 3 * i;
-            r = 1.0 - ((p < 1.0) ? 1.0 - p : (p > 2.0) ? p - 2.0 : 0.0);
-            g = 1.0 - ((p < 1.0) ? p : (p > 2.0) ? 0.0 : 2.0 - p);
-            b = 1.0 - ((p < 1.0) ? 0.0 : (p > 2.0) ? 3.0 - p : p - 1.0);  ;  
-            wait (0.01);
-        }
+    float h;       //  hue 
+    float s,v;   // saturation and  value;
+    float temp,temp2;
+    r.period(0.001);  // set pwm period
+    
+    LCD.claim(stdout);      // send stdout to the LCD display
+    LCD.cls();
+    LCD.locate(10,0);
+    LCD.set_font((unsigned char*) Arial_9);
+    printf("RGB Led Demo");
+    LCD.set_font((unsigned char*) Small_7);
+    s = 1.0;
+    for(;;){
+        // get Poti 1 for color
+        temp = Pot1.read();
+        temp2 = Pot1.read();
+        h = (temp + temp2) * 180;
+        LCD.locate(0,13);
+        printf("Colour = %3.2f ",h);
+        // get Poti 2 fo value
+        temp = Pot2.read();
+        temp2 = Pot2.read();
+        v = (temp + temp2) / 2;
+        LCD.locate(0,23);
+        printf("Val = %01.3f ",v);
+        LCD.copy_to_lcd();
+        hsv2rgb(h,s,v);
+        wait_ms(500);
     }
 }
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