File content as of revision 2:8d698a18ae6f:

#include "mbed.h"
 
PwmOut red(D7);
PwmOut green(D6);
PwmOut blue(D5);

int maincolor(void)
{
  {
        red=0;  //all off
        green=0;
        blue=0;
        wait(1);
     
        red=1;  //just red
        green=0;
        blue=0;
        wait(1);
        
        red=0;  //just green
        green=1;
        blue=0;
        wait(1);
        
        red=0;  //just blue
        green=0;
        blue=1;
        wait(1);   
        
        
        red=1;  //yellow... red and green
        green=1;
        blue=0;
        wait(1);
        
        red=0;  //cyan... green and blue
        green=1;
        blue=1;
        wait(1);
        
        red=1;  //purple... red and blue
        green=0;
        blue=1;
        wait(1);
        
        red=1;  //white... all
        green=1;
        blue=1;
        wait(1);
 }
return 0;
}


int spectrum(void)
{
    red.period(0.001);
        for(float i = 0.0; i < 1.0 ; i += 0.001) 
        {
            float p = 3 * i;
            red = 1.0 - ((p < 1.0) ? 1.0 - p : (p > 2.0) ? p - 2.0 : 0.0);
            green = 1.0 - ((p < 1.0) ? p : (p > 2.0) ? 0.0 : 2.0 - p);
            blue = 1.0 - ((p < 1.0) ? 0.0 : (p > 2.0) ? 3.0 - p : p - 1.0);  ;  
            wait (0.01);
        }
 return 0;   
}



int main(void)
{
 while(1)
  {
    maincolor();
    spectrum();
  }
}