Peter Drescher
Let the on board RGB led run thru the color circle
Test program for LPC 1549 and LPC 812 board. It use the on board RGB led to scroll thru the colors.
Revision 0:5a281c0ca6ae, committed 2015-10-17
- Comitter:
- dreschpe
- Date:
- Sat Oct 17 16:23:22 2015 +0000
- Child:
- 1:c92fa914546d
- Commit message:
- Let the RGB led run thru the colours
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /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;
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Oct 17 16:23:22 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/34e6b704fe68 \ No newline at end of file