RGBLed.h

00001 #include "mbed.h"
00002  
00003 //Class to control an RGB LED using three PWM pins
00004 class RGBLed
00005 {
00006 public:
00007     RGBLed(PinName redpin, PinName greenpin, PinName bluepin);
00008     void write(float red,float green, float blue);
00009     void write(LEDColor c);
00010     RGBLed operator = (LEDColor c) {
00011         write(c);
00012         return *this;
00013     };
00014 private:
00015     PwmOut _redpin;
00016     PwmOut _greenpin;
00017     PwmOut _bluepin;
00018 };
00019  
00020 RGBLed::RGBLed (PinName redpin, PinName greenpin, PinName bluepin)
00021     : _redpin(redpin), _greenpin(greenpin), _bluepin(bluepin)
00022 {
00023     //50Hz PWM clock default a bit too low, go to 2000Hz (less flicker)
00024     _redpin.period(0.0005);
00025 }
00026  
00027 void RGBLed::write(float red,float green, float blue)
00028 {
00029     _redpin = red;
00030     _greenpin = green;
00031     _bluepin = blue;
00032 }
00033 void RGBLed::write(LEDColor c)
00034 {
00035     _redpin = c.red;
00036     _greenpin = c.green;
00037     _bluepin = c.blue;
00038 }
00039  
00040 ////classes could be moved to include file
00041 // 
00042 // 
00043 ////Setup RGB led using PWM pins and class
00044 //RGBLed myRGBled(p23,p22,p21); //RGB PWM pins
00045 // 
00046 ////setup some color objects in flash using const's
00047 //const LEDColor red(1.0,0.0,0.0);
00048 //const LEDColor green(0.0,0.2,0.0);
00049 ////brighter green LED is scaled down to same as red and
00050 ////blue LED outputs on Sparkfun RGBLED
00051 //const LEDColor blue(0.0,0.0,1.0);
00052 //const LEDColor yellow(1.0,0.2,0.0);
00053 //const LEDColor white(1.0,0.2,1.0);
00054 // 
00055 //int main()
00056 //{
00057 //    while(1) {
00058 //        myRGBled = red;
00059 //        //myRGBled.write(1.0,0.0,0,0); //red
00060 //        wait(2.0);
00061 //        myRGBled = green;
00062 //        //myRGBled.write(0.0,1.0,0.0); //green
00063 //        wait(2.0);
00064 //        myRGBled = blue;
00065 //        //myRGBled.write(0.0,0.0,1.0); //blue
00066 //        wait(2.0);
00067 //        myRGBled = red + green; //yellow = red + green
00068 //        wait(2.0);
00069 //        //white with a slow fade to black dimming effect
00070 //        for (float brightness=1.0; brightness>=0.0001; brightness*=0.99) {
00071 //            myRGBled = white * brightness;
00072 //            wait(0.005);
00073 //        }
00074 //        wait(2.0);
00075 //    }
00076 //}