Diff: main.cpp

Revision:

0:5a281c0ca6ae

Child:

1:c92fa914546d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Oct 17 16:23:22 2015 +0000
@@ -0,0 +1,83 @@
+#include "mbed.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 (LED1);
+PwmOut g (LED2);
+PwmOut b (LED3);
+
+// 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() {
+    float h;       //  hue 
+    float s,v;   // saturation and  value;
+    r.period(0.001);  // set pwm period
+    s = 1.0;
+    v = 1.0;
+    h = 0.0;    
+    for(;;){   // run thru colors 
+        hsv2rgb(h,s,v);
+        wait_ms(50);
+        if(h<360) h++;
+        else h = 0;
+    }
+}